mssql-python 1.5: Apache Arrow, sql_variant, and Native UUIDs
We're excited to announce the release of mssql-python 1.5.0, the latest version of Microsoft's official Python driver for SQL Server, Azure SQL Database, and SQL databases in Fabric. This release delivers Apache Arrow fetch support for high-performance data workflows, first-class sql_variant and native UUID support, and a collection of important bug fixes. pip install --upgrade mssql-python Apache Arrow fetch support If you're working with pandas, Polars, DuckDB, or any Arrow-native data framework, this release changes how you get data out of SQL Server. The new Arrow fetch API returns query results as native Apache Arrow structures, using the Arrow C Data Interface for zero-copy handoff directly from the C++ layer to Python. This is a significant performance improvement over the traditional fetchall() path, which converts every value through Python objects. With Arrow, columnar data stays in columnar format end-to-end, and your data framework can consume it without any intermediate copies. Three methods for different workflows cursor.arrow() fetches the entire result set as a PyArrow Table: import mssql_python conn = mssql_python.connect( "SERVER=myserver.database.windows.net;" "DATABASE=AdventureWorks;" "UID=myuser;PWD=mypassword;" "Encrypt=yes;" ) cursor = conn.cursor() cursor.execute("SELECT * FROM Sales.SalesOrderDetail") # Get the full result as a PyArrow Table table = cursor.arrow() # Convert directly to pandas - zero-copy where possible df = table.to_pandas() # Or to Polars - also zero-copy import polars as pl df = pl.from_arrow(table) cursor.arrow_batch() fetches a single RecordBatch of a specified size, useful when you want fine-grained control over memory: cursor.execute("SELECT * FROM Production.TransactionHistory") # Process in controlled chunks while True: batch = cursor.arrow_batch(batch_size=10000) if batch.num_rows == 0: break # Process each batch individually process(batch.to_pandas()) cursor.arrow_reader() returns a streaming RecordBatchReader, which integrates directly with frameworks that accept readers: cursor.execute("SELECT * FROM Production.TransactionHistory") reader = cursor.arrow_reader(batch_size=8192) # Write directly to Parquet with streaming - no need to load everything into memory import pyarrow.parquet as pq pq.write_table(reader.read_all(), "output.parquet") # Or iterate batches manually for batch in reader: process(batch) How it works under the hood The Arrow integration is built directly into the C++ pybind11 layer. When you call any Arrow fetch method, the driver: Allocates columnar Arrow buffers based on the result set schema Fetches rows from SQL Server in batches using bound column buffers Converts and packs values directly into the Arrow columnar format Exports the result via the Arrow C Data Interface as PyCapsule objects PyArrow imports the capsules with zero copy Every SQL Server type maps to the appropriate Arrow type: INT to int32, BIGINT to int64, DECIMAL(p,s) to decimal128(p,s), DATE to date32, TIME to time64[ns], DATETIME2 to timestamp[us], UNIQUEIDENTIFIER to large_string, VARBINARY to large_binary, and so on. LOB columns (large VARCHAR(MAX), NVARCHAR(MAX), VARBINARY(MAX), XML, UDTs) are handled transparently by falling back to row-by-row GetData fetching while still assembling the result into Arrow format. Community contribution The Arrow fetch support was contributed by @ffelixg. This is a substantial contribution spanning the C++ pybind layer, the Python cursor API, and comprehensive tests. Thank you, Felix Graßl, for an outstanding contribution that brings high-performance data workflows to mssql-python. sql_variant type support SQL Server's sql_variant type stores values of various data types in a single column. It's commonly used in metadata tables, configuration stores, and EAV (Entity-Attribute-Value) patterns. Version 1.5 adds full support for reading sql_variant values with automatic type resolution. The driver reads the inner type tag from the sql_variant wire format and returns the appropriate Python type: cursor.execute(""" CREATE TABLE #config ( key NVARCHAR(50) PRIMARY KEY, value SQL_VARIANT ) """) cursor.execute("INSERT INTO #config VALUES ('max_retries', CAST(5 AS INT))") cursor.execute("INSERT INTO #config VALUES ('timeout', CAST(30.5 AS FLOAT))") cursor.execute("INSERT INTO #config VALUES ('app_name', CAST('MyApp' AS NVARCHAR(50)))") cursor.execute("INSERT INTO #config VALUES ('start_date', CAST('2026-01-15' AS DATE))") cursor.execute("SELECT value FROM #config ORDER BY key") rows = cursor.fetchall() # Each value comes back as the correct Python type assert rows[0][0] == "MyApp" # str assert rows[1][0] == 5 # int assert rows[2][0] == date(2026, 1, 15) # datetime.date assert rows[3][0] == 30.5 # float All 23+ base types are supported, including int, float, Decimal, bool, str, date, time, datetime, bytes, uuid.UUID, and None. Native UUID support Previously, UNIQUEIDENTIFIER columns were returned as strings, requiring manual conversion to uuid.UUID. Version 1.5 changes the default: UUID columns now return native uuid.UUID objects. import uuid cursor.execute("SELECT NEWID() AS id") row = cursor.fetchone() # Native uuid.UUID object - no manual conversion needed assert isinstance(row[0], uuid.UUID) print(row[0]) # e.g., UUID('550e8400-e29b-41d4-a716-446655440000') UUID values also bind natively as input parameters: my_id = uuid.uuid4() cursor.execute("INSERT INTO Users (id, name) VALUES (?, ?)", my_id, "Alice") Migration compatibility If you're migrating from pyodbc and your code expects string UUIDs, you can opt out at three levels: # Module level - affects all connections mssql_python.native_uuid = False # Connection level - affects all cursors on this connection conn = mssql_python.connect(conn_str, native_uuid=False) When native_uuid=False, UUID columns return strings as before. Row class export The Row class is now publicly exported from the top-level mssql_python module. This makes it easy to use in type annotations and isinstance checks: from mssql_python import Row cursor.execute("SELECT 1 AS id, 'Alice' AS name") row = cursor.fetchone() assert isinstance(row, Row) print(row[0]) # 1 (index access) print(row.name) # "Alice" (attribute access) Bug fixes Qmark false positive fix The parameter style detection logic previously misidentified? characters inside SQL comments, string literals, bracketed identifiers, and double-quoted identifiers as qmark parameter placeholders. A new context-aware scanner correctly skips over these SQL quoting contexts: # These no longer trigger false qmark detection: cursor.execute("SELECT [is this ok?] FROM t") cursor.execute("SELECT 'what?' AS col") cursor.execute("SELECT /* why? */ 1") NULL VARBINARY parameter fix Fixed NULL parameter type mapping for VARBINARY columns, which previously could fail when passing None as a binary parameter. Bulkcopy auth fix Fixed stale authentication fields being retained in the bulk copy context after token acquisition. This could cause Entra ID-authenticated bulk copy operations to fail on subsequent calls. Explicit module exports Added explicit __all__ exports from the main library module to prevent import resolution issues in tools like mypy and IDE autocompletion. Credential cache fix Fixed the credential instance cache to correctly reuse and invalidate cached credential objects, preventing unnecessary re-authentication. datetime.time microseconds fix Fixed datetime.time values incorrectly having their microseconds component set to zero when fetched from TIME columns. The road to 1.5 Release Date Highlights 1.0.0 November 2025 GA release - DDBC architecture, Entra ID auth, connection pooling, DB API 2.0 compliance 1.1.0 December 2025 Parameter dictionaries, Connection.closed property, Copilot prompts 1.2.0 January 2026 Param-as-dict, non-ASCII path handling, fetchmany fixes 1.3.0 January 2026 Initial BCP implementation (internal), SQLFreeHandle segfault fix 1.4.0 February 2026 BCP public API, spatial types, Rust core upgrade, encoding & stability fixes 1.5.0 April 2026 Apache Arrow fetch, sql_variant, native UUIDs, qmark & auth fixes Get started today pip install --upgrade mssql-python Documentation: github.com/microsoft/mssql-python/wiki Release notes: github.com/microsoft/mssql-python/releases Roadmap: github.com/microsoft/mssql-python/blob/main/ROADMAP.md Report issues: github.com/microsoft/mssql-python/issues Contact: mssql-python@microsoft.com We'd love your feedback. Try the new Arrow fetch API with your data workflows, let us know how it performs, and file issues for anything you run into. This driver is built for the Python data community, and your input directly shapes what comes next.Microsoft ODBC Driver 18.6.2 for SQL
What Is the Microsoft ODBC Driver for SQL? The Microsoft ODBC Driver for SQL provides native connectivity from Windows, Linux, and macOS applications to SQL Server, Azure SQL Database, Azure SQL Managed Instance, and Microsoft Fabric. It is the recommended driver for new application development using the ODBC API, and it supports , Always Encrypted, distributed transactions, and modern authentication methods including Microsoft Entra ID (formerly Azure Active Directory). Whether you're building high-throughput data pipelines, managing enterprise databases, or developing cloud-native applications on Microsoft Fabric, the ODBC driver is a foundational component of the SQL Server connectivity stack. What's New in 18.6.2 Improved Vector Parameter Handling for Prepared Statements Version 18.6.2 improves the handling of output and input/output vector parameters when using prepared statements. This enhancement benefits applications that rely on parameterized queries with array bindings — a common pattern in batch processing and high-performance data access layers. Microsoft Fabric Redirection Support (Up to 10 Redirections) The driver now allows up to 10 server redirections per connection attempt, up from previous limits. This change directly supports Microsoft Fabric redirection scenarios, where connections may be transparently routed through multiple endpoints before reaching the target workspace. If your applications connect to Fabric SQL endpoints, this update ensures more reliable connectivity in complex routing topologies. Alpine Linux Packaging Improvements Architecture detection and packaging have been improved for Alpine Linux environments, making it easier to deploy the driver in lightweight, container-based workloads that use Alpine as a base image. Bug Fixes This release addresses several important issues reported by the community and identified through internal testing: Parameter Array Processing SQL_ATTR_PARAMS_PROCESSED_PTR accuracy — Fixed an issue where the number of processed parameter sets was not reported correctly when executing parameter arrays. Applications that inspect SQL_ATTR_PARAMS_PROCESSED_PTR after batch execution will now see the correct count. SQL_PARAM_IGNORE handling — Fixed SQL_ATTR_PARAMS_PROCESSED_PTR and row counting when SQL_PARAM_IGNORE is used within parameter arrays, ensuring that ignored parameters are accounted for properly. Crash Fixes SQLNumResultCols segmentation fault — Resolved a segfault that occurred when calling SQLNumResultCols in describe-only scenarios where no parameter bindings are present. Table-valued parameter (TVP) NULL handling — Fixed a segmentation fault triggered by NULL values in TVP arguments. Applications passing TVPs with nullable columns should no longer experience unexpected crashes. bcp_bind Consecutive Field Terminators (Known Issue from 18.6.1) bcp_bind fix — Corrected bcp_bind to properly handle consecutive field terminators without misinterpreting them as empty fields. This resolves a known issue introduced in version 18.6.1, where consecutive terminators were incorrectly interpreted as NULL values instead of empty strings. If you deferred upgrading to 18.6.1 because of this issue, 18.6.2 is the recommended target version. Linux Packaging Debian EULA acceptance — Fixed Debian package installation to correctly honor EULA acceptance and complete successfully, eliminating a friction point for automated deployments. RPM side-by-side installation — Fixed RPM packaging rules to allow installing multiple driver versions side by side, which is important for environments that need to maintain backward compatibility or perform staged rollouts. Distributed Transactions XA recovery — Fixed XA recovery to compute transaction IDs correctly, avoiding scenarios where recoverable transactions could be missed during the recovery process. This is a critical fix for applications using distributed transactions with XA transaction managers. Upgrading from Older Versions If you are upgrading from a version prior to 18.6.1, you will also benefit from the features introduced in that release: Vector data type support — Native support for the vector data type (float32), enabling AI and machine learning scenarios directly through ODBC. ConcatNullYieldsNull property — Connection-level control over null concatenation behavior. New platform support — Azure Linux 3.0 ARM, Debian 13, Red Hat 10, and Ubuntu 25.10. Version 18.6.2 builds on these additions with the stability and correctness fixes described above. Download & Installation Windows Platform Download Link x64 Download x86 Download ARM64 Download Linux & macOS Installation packages for supported Linux distributions and macOS are available on Microsoft Learn: Download ODBC Driver for SQL Server (Linux/macOS) Documentation & Release Notes For the full list of changes, platform support details, and known issues, see the official release notes: Windows Release Notes Linux & macOS Release Notes Bug Fixes Get Started We encourage all users to upgrade to version 18.6.2.1 to take advantage of the fixes and improvements in this release — particularly if you are using parameter arrays, table-valued parameters, bcp operations, or connecting to Microsoft Fabric endpoints. As always, we welcome your feedback. If you encounter issues, please report them through the SQL Server feedback channel or open an issue on the Microsoft ODBC Driver GitHub repository. Happy coding!Microsoft.Data.SqlClient 7.0 Is Here: A Leaner, More Modular Driver for SQL Server
Today we're shipping the general availability release of Microsoft.Data.SqlClient 7.0, a major milestone for the .NET data provider for SQL Server. This release tackles the single most requested change in the repository's history, introduces powerful new extensibility points for authentication, and adds protocol-level features for Azure SQL Hyperscale, all while laying the groundwork for a more modular driver architecture. If you take away one thing from this post: the core SqlClient package is dramatically lighter now. Azure dependencies have been extracted into a separate package, and you only pull them in if you need them. dotnet add package Microsoft.Data.SqlClient --version 7.0.0 The #1 Request: A Lighter Package For years, the most upvoted issue in the SqlClient repository asked the same question: "Why does my console app that just talks to SQL Server pull in Azure.Identity, MSAL, and WebView2?" With 7.0, it doesn't anymore. We've extracted all Azure / Microsoft Entra authentication functionality into a new Microsoft.Data.SqlClient.Extensions.Azure package. The core driver no longer carries Azure.Core, Azure.Identity, Microsoft.Identity.Client, or any of their transitive dependencies. If you connect with SQL authentication or Windows integrated auth, your bin folder just got dramatically smaller. For teams that do use Entra authentication, the migration is straightforward. Add one package reference and you're done: dotnet add package Microsoft.Data.SqlClient.Extensions.Azure No code changes. No configuration changes. You can also now update Azure dependency versions on your own schedule, independent of driver releases. This is something library authors and enterprise teams have been asking for. Pluggable Authentication with SspiContextProvider Integrated authentication in containers and cross-domain environments has always been a pain point. Kerberos ticket management, sidecar processes, domain trust configuration: the workarounds were never simple. Version 7.0 introduces a new public SspiContextProvider API on SqlConnection that lets you take control of the authentication handshake. You provide the token exchange logic; the driver handles everything else. var connection = new SqlConnection(connectionString); connection.SspiContextProvider = new MyKerberosProvider(); connection.Open(); This opens the door to scenarios the driver never natively supported: authenticating across untrusted domains, using NTLM with explicit credentials, or implementing custom Kerberos negotiation in Kubernetes pods. A sample implementation is available in the repository. Async Read Performance: Packet Multiplexing (Preview) One of the most community-driven features in 7.0 is packet multiplexing, a change to how the driver processes TDS packets during asynchronous reads. Originally contributed by community member Wraith2, this work delivers a significant leap in async read performance for large result sets. Packet multiplexing was first introduced in 6.1 and has been refined across the 7.0 preview cycle with additional bug fixes and stability improvements. In 7.0, it ships behind two opt-in feature switches so we can gather broader real-world feedback before making it the default: AppContext.SetSwitch("Switch.Microsoft.Data.SqlClient.UseCompatibilityAsyncBehaviour", false); AppContext.SetSwitch("Switch.Microsoft.Data.SqlClient.UseCompatibilityProcessSni", false); Setting both switches to false enables the new async processing path. By default, the driver uses the existing (compatible) behavior. We need your help. If your application performs large async reads (ExecuteReaderAsync with big result sets, streaming scenarios, or bulk data retrieval), please try enabling these switches and let us know how it performs in your environment. File your results on GitHub Issues to help us move this toward on-by-default in a future release. Enhanced Routing for Azure SQL Azure SQL environments with named read replicas and gateway-based load balancing can now take advantage of enhanced routing, a TDS protocol feature that lets the server redirect connections to a specific server and database during login. This is entirely transparent to your application. No connection string changes, no code changes. The driver negotiates the capability automatically when the server supports it. .NET 10 Ready SqlClient 7.0 compiles and tests against the .NET 10 SDK, so you're ready for the next major .NET release on day one. Combined with continued support for .NET 8, .NET 9, .NET Framework 4.6.2+, and .NET Standard 2.0 (restored in 6.1), the driver covers the full spectrum of active .NET runtimes. ActiveDirectoryPassword Is Deprecated: Plan Your Migration As Microsoft moves toward mandatory multifactor authentication across its services, we've deprecated SqlAuthenticationMethod.ActiveDirectoryPassword (the ROPC flow). The method still works in 7.0, but it's marked [Obsolete] and will generate compiler warnings. Now is the time to move to a stronger alternative: Scenario Recommended Authentication Interactive / desktop apps Active Directory Interactive Service-to-service Active Directory Service Principal Azure-hosted workloads Active Directory Managed Identity Developer / CI environments Active Directory Default Quality of Life Improvements Beyond the headline features, 7.0 includes a collection of improvements that make the driver more reliable and easier to work with in production. Better retry logic. The new SqlConfigurableRetryFactory.BaselineTransientErrors property exposes the built-in transient error codes, so you can extend the default list with your own application-specific codes instead of copy-pasting error numbers from source. More app context switches. You can now set MultiSubnetFailover=true globally, ignore server-provided failover partners in Basic Availability Groups, and control async multi-packet behavior, all without modifying connection strings. Better diagnostics on .NET Framework. SqlClientDiagnosticListener is now enabled for SqlCommand on .NET Framework, closing a long-standing observability gap. Connection performance fix. A regression where SPN generation was unnecessarily triggered for SQL authentication connections on the native SNI path has been resolved. Performance improvements. Allocation reductions across Always Encrypted scenarios, SqlStatistics timing, and key store providers. Upgrading from 6.x For most applications, upgrading is a package version bump: dotnet add package Microsoft.Data.SqlClient --version 7.0.0 If you use Microsoft Entra authentication, also add: dotnet add package Microsoft.Data.SqlClient.Extensions.Azure If you use ActiveDirectoryPassword, you'll see a compiler warning. Start planning your migration to a supported auth method. Review the full release notes in release-notes/7.0 for the complete list of changes across all preview releases. Thank You to Our Contributors Open-source contributions are central to SqlClient's development. We'd like to recognize the community members who contributed to the 7.0 release: edwardneal · ErikEJ · MatthiasHuygelen · ShreyaLaxminarayan · tetolv · twsouthwick · Wraith2 What's Next We're continuing to invest in performance, modularity, and modern .NET alignment. Stay tuned for updates on the roadmap, and keep the feedback coming. Your issues and discussions directly shape what we build. NuGet: Microsoft.Data.SqlClient 7.0.0 GitHub: dotnet/SqlClient Issues & Feedback: github.com/dotnet/SqlClient/issues Docs: Microsoft.Data.SqlClient on Microsoft LearnAnnouncing the General Availability of Microsoft JDBC Driver 13.4 for SQL Server
We are excited to announce the General Availability (GA) of Microsoft JDBC Driver 13.4 for SQL Server. This release incorporates all improvements delivered across the 13.3.x preview cycle (13.3.0, 13.3.1, and 13.3.2) and represents a significant step forward in performance observability, AI/vector workload readiness, SQL Server 2025 compatibility, and security posture. You can download the driver from Maven Central, Microsoft Learn, or from GitHub Releases. As with previous releases, two JAR variants are available: jre8 for Java 8 and jre11 for Java 11 and above. Highlights Vector (FLOAT16) Subtype Support Building on the native VECTOR data type support introduced earlier, version 13.4 adds FLOAT16 subtype support with full IEEE-754 compliant serialization and deserialization between Java Float[] and the half-precision wire format. This enables efficient float16 vector storage and transmission for AI, embeddings, and vector search workloads—reducing memory footprint and network payload without changing the Java programming model. Performance Logger: Connection and Statement-Level Metrics A new performance logging framework gives developers and operators visibility into driver-level latencies. In 13.4, the logger covers: Connection metrics: prelogin, login, and token acquisition timing via the com.microsoft.sqlserver.jdbc.PerformanceMetrics.Connection logger. Statement metrics: granular execution phases including REQUEST_BUILD, FIRST_SERVER_RESPONSE, PREPARE, PREPEXEC, and EXECUTE for both Statement and PreparedStatement. An extensible callback infrastructure is included for custom telemetry integration. New prepareMethod Options Two new prepareMethod connection property values provide fine-grained control over how the driver executes prepared statements: prepareMethod=none — Forces literal parameter substitution with SQL batch execution, bypassing server-side prepared statement handles (sp_prepexec / sp_prepare). Only recommended for applications that require Sybase-style compatibility with DYNAMIC_PREPARE=false behavior. prepareMethod=scopeTempTablesToConnection — This option applies the prepareMethod=none behavior only to prepared statements with references to temporary table creation. This behavior ensures temporary tables created by a prepared statement persist on the connection after the prepared statement finishes. Other prepared statements will use prepareMethod=prepexec behavior. This option is only recommended for existing applications that require this temporary table behavior. Both options leave the default behavior unchanged. ADAL Removed - Entra (Azure Active Directory) Integrated Authentication Modernized The legacy ADAL dependency (`adalsql.dll`/`adal.dll`) has been fully removed. Entra ID Integrated Authentication (`Authentication=ActiveDirectoryIntegrated`) now uses mssql-auth.dll, a component installed by the latest Microsoft ODBC Driver 18 for SQL Server and Microsoft OLE DB Driver 19 for SQL Server. Java 25 (LTS) Support Official support for Java 25 (LTS) has been added, while non-LTS Java versions 22–24 have been removed from build configurations. This simplifies maintenance and ensures the driver is tested against the Java versions that matter most for production workloads. SQL Server 2025 Readiness DatabaseMetaData.getColumns() now prefers sp_columns_170 on SQL Server 2025 for accurate metadata on newer types such as VECTOR and enhanced JSON, with automatic fallback to sp_columns_100 for older versions. Combined with expanded test coverage, the driver is fully validated against SQL Server 2025. Security Updates Transitive dependencies have been upgraded to address multiple CVEs: azure-identity → 1.18.2 msal4j → 1.23.1 Netty → 4.1.130.Final Reactor Netty → 1.2.13 Nimbus JOSE JWT → 10.0.1 These updates resolve CVE-2025-59250, CVE-2025-67735, CVE-2025-53864, CVE-2025-58056, CVE-2025-58057, CVE-2025-55163, CVE-2025-24970, CVE-2025-22227, and CVE-2025-25193, with no breaking API changes. Additionally, RFC 5280–compliant IP address validation has been added to SSL certificate SAN checks, removing the need for hostname workarounds when connecting via IP over TLS. Bug Fixes Version 13.4 includes a substantial number of stability and correctness fixes accumulated across the preview cycle: Area Fix Cross-database stored procedures sp_sproc_columns is now fully qualified with database.sys, fixing metadata lookup failures with named parameters across databases and eliminating schema name-squatting risks. Nested stored procedure errors Multiple nested RAISERROR calls now surface correctly via SQLException.getNextException() through lazy exception chaining. Geography parsing Scientific notation in coordinates (e.g., negative exponents in WKT) no longer causes NumberFormatException. Bulk copy: SQL functions Automatic fallback to standard batch execution when SQL functions like len(?) are used with useBulkCopyForBatchInsert. Bulk copy: computed columns Destination column validation now correctly ignores computed persisted columns, preventing false "invalid column mapping" errors. Bulk copy: InputStream setBinaryStream() now works correctly with Bulk Copy for Batch Insert into VARBINARY(MAX) columns. Bulk copy: isolated quotes Tab-delimited data with isolated quotes no longer causes IndexOutOfBoundsException. getIndexInfo() collation Collation conflicts in mixed-collation environments are resolved by applying COLLATE DATABASE_DEFAULT consistently. getSchemas() catalog Built-in schemas (dbo, sys, etc.) now return correct TABLE_CATALOG values instead of NULL. Statement.execute() update counts Valid update counts are no longer silently lost after an error in mixed batch execution. PreparedStatement update counts Accurate counts are now returned for multi-value INSERT statements with triggers. Fatal error handling TDS DONE tokens with fatal severity (25+) are properly detected and propagated, preventing silent failures. TVP metadata getParameterMetaData() no longer crashes when called on statements using Table-Valued Parameters. supportsIntegrityEnhancementFacility Now correctly returns true, reflecting SQL Server's full constraint support. Azure Synapse serverless getIndexInfo() falls back to sys.indexes when sp_statistics is unavailable. Testing and Quality Improvements This release reflects a significant investment in test infrastructure and coverage: State-machine testing framework — A lightweight, seed-reproducible framework for randomized JDBC state exploration in JUnit 5, improving edge-case detection with reproducible failures. Migrated FX regression tests — 37 legacy regression scenarios covering statement execution, ResultSet behavior, batching, cursors, and transaction flows have been migrated to JUnit with full behavioral parity. Expanded unit test coverage — Key components including SQLServerCallableStatement, SQLServerDatabaseMetaData, SQLServerPreparedStatement, and SQLServerResultSet now have greater test coverage. Mockito integration — Added as a test dependency for better unit test isolation and control. AI-assisted development context — ARCHITECTURE.md, GLOSSARY.md, and PATTERNS.md have been added to guide contributors using AI coding assistants. Getting Started Maven: <dependency> <groupId>com.microsoft.sqlserver</groupId> <artifactId>mssql-jdbc</artifactId> <version>13.4.0.jre11</version> </dependency> Gradle: implementation 'com.microsoft.sqlserver:mssql-jdbc:13.4.0.jre11' Replace jre11 with jre8 if you are on Java 8. Breaking Changes There are no breaking API changes in this release. The removal of the ADAL dependency for Entra ID Integrated Authentication is transparent. The only difference from previous releases is `Authentication=ActiveDirectoryIntegrated` now has a requirement that the latest Microsoft ODBC Driver 18 for SQL Server or Microsoft OLE DB Driver 19 for SQL Server be installed. Feedback We value your input. Please report issues or feature requests on our GitHub Issues page and take our survey to let us know how we're doing. Thank you to all the contributors and community members who helped shape this release! — The Microsoft JDBC Driver for SQL Server TeamAnnouncing GA of SQL Server 2025 on RHEL 10 and Ubuntu 24.04, with additional enhancements for Linux deployments
We are excited to announce the General Availability (GA) of SQL Server 2025 on Red Hat Enterprise Linux (RHEL) 10 and Ubuntu 24.04, starting with the CU1 release. This milestone empowers enterprises to deploy SQL Server 2025 on the latest Linux distributions, ensuring robust compatibility, enhanced security, and optimal performance for mission-critical workloads. The GA reinforces our commitment to delivering a modern, secure, and AI-ready database platform across diverse Linux environments. CU1 Release Highlights Key Features: Production-Ready Support: GA support for RHEL 10 and Ubuntu 24.04, enabling production deployments on the newest Linux platforms. Important: Update your SQL Server repository To ensure you are installing the production-ready GA version of SQL Server 2025, it is essential to update your repository from mssql-server-preview.repo to mssql-server-2025.repo. Continuing to use the preview repository may result in installing pre-release builds that are not intended for production workloads. You can proceed with the installation steps as described in the official documentation: RHEL: Install SQL Server on Linux Ubuntu: Install SQL Server on Linux Enable database creation or restoration in Contained Availability Group sessions You can now use the session context key 'allow_cag_create_db' set via the existing stored procedure sp_set_session_contex to enable database creation and restoration directly within a contained availability group (CAG) session through the CAG listener. Only users with the dbcreator role can create databases in a CAG session, and only users with the db_owner or sysadmin role can restore databases. Example: EXEC sp_set_session_context @key = N'allow_cag_create_db', @value = 1; This command enables the feature for your session. To disable it, set @value = 0. Enhanced Observability: SQL Server 2025 on Linux introduces new Dynamic Management Views (DMVs) that provides comprehensive, system-level insights. These DMVs collect and expose metrics from the underlying operating system, allowing administrators to monitor and diagnose not only SQL Server’s performance, but also the impact of other processes running on the same host. This holistic visibility helps distinguish between issues caused by SQL Server and those originating from other workloads or infrastructure bottlenecks, enabling more effective troubleshooting and optimization for mission-critical deployments. sys.dm_os_linux_cpu_stats: Enables users to identify CPU saturation, investigate I/O waits, analyze system responsiveness, and correlate SQL Server performance with broader OS activity, helping to separate database-specific bottlenecks from infrastructure-wide challenges. sys.dm_os_linux_disk_stats: Facilitates detection of log flush slowness, assessment of checkpoint or read-heavy workloads, and identification of external I/O pressure from noisy neighbors on shared hosts, helping teams optimize storage tiers and queue settings. sys.dm_os_linux_net_stats: Provides real-time visibility into network interface statistics, enabling proactive monitoring and troubleshooting of connectivity and throughput issues. Collectively, these DMVs equip database professionals with actionable, OS-level metrics to maintain stability, optimize performance, and ensure reliability in mission-critical Linux deployments. References What’s New in SQL Server 2025 Contained Availability Group You can share your feedback using any of the following methods: Submit your ideas on Azure Ideas (Use the SQL Server on Linux Group on the left side of the page) Alternatively, you can open issues: Issues · microsoft/mssql-docker (github.com) on GitHub. We hope you give SQL Server 2025 CU1 on RHEL10 or Ubuntu 24.04 a try - and we look forward to hearing what you think!
Announcing SQLCon 2026: Better Together with FabCon!
We’re thrilled to unveil SQLCon 2026, the premier Microsoft SQL Community Conference, co-located with the Microsoft Fabric Community Conference (FabCon) from March 16–20, 2026! This year, we’re bringing the best of both worlds under one roof—uniting the vibrant SQL and Fabric communities for a truly next-level experience. Whether you’re passionate about SQL Server, Azure SQL, SQL in Fabric, SQL Tools, migration and modernization, database security, or building AI-powered apps with SQL, SQLCon 2026 has you covered. Dive into 50+ breakout sessions and 4 expert-led workshops designed to help you optimize, innovate, and connect. Why are SQLCon + FabCon better together? One registration, double the value: Register for either conference and get full access to both—mix and match sessions, keynotes, and community events to fit your interests. Shared spaces, shared energy: Enjoy the same expo hall, registration desk, conference app, and community lounge. Network with peers across the data platform spectrum. Unforgettable experiences: Join us for both keynotes at the State Farm Arena and celebrate at the legendary attendee party at the Georgia Aquarium. Our goal is to reignite the SQL Community spirit—restoring the robust networks, friendships, and career-building opportunities that make this ecosystem so special. SQLCon is just the beginning of a renewed commitment to connect at conferences, user groups, online, and at regional events. Early Access Pricing Extended! Register by November 14th and save $200 with code SQLCMTY200. Register Now! Want to share your expertise? The Call for Content is open until November 20th for both conferences! Let’s build the future of data—together. See you at SQLCon + FabCon!Unlocking Enterprise AI: SQL Server 2025 and NVIDIA Nemotron RAG Accelerate AI
Today, most of the world’s data still remains untapped, sitting in databases, documents, and systems across organizations. Enterprises are racing to unlock this data’s value by building the next wave of generative AI applications—solutions that can answer questions, summarize documents, and drive smarter decisions. At the heart of these innovations are retrieval-augmented generation (RAG) pipelines, which enable users to interactively engage with large amount of data that continuously evolves. Yet, as promising as RAG pipelines are, enterprises face real challenges in making them work at scale. Handling both structured and unstructured data, processing massive volumes efficiently, and ensuring privacy and security are just a few hurdles. This is where the integration between SQL Server 2025 and NVIDIA Nemotron RAG models, deployed as NVIDIA NIM microservices, comes in, offering a new approach that streamlines AI deployment and delivers enterprise-grade performance—whether you’re running workloads in the cloud or on-premises. “As AI becomes core to every enterprise, organizations need efficient and compliant ways to bring intelligence to their data,” said Joey Conway, Senior Director of Generative AI software at NVIDIA. “With SQL Server 2025’s built-in AI and NVIDIA Nemotron RAG, deployed as NIM microservices, enterprises can deploy and run AI models close to their data on premises or in the cloud without complex integration, accelerating innovation while maintaining data sovereignty and control.” Overcoming the complexity of generating embeddings at scale Customer challenge Building responsive AI applications using RAG requires converting SQL data into vector embeddings—a process that feeds huge amounts of text through complex neural networks. This is inherently parallel and compute-intensive, often creating performance bottlenecks that prevent real-time data indexing. The result? Slow applications and poor user experiences. Moreover, enterprises need flexibility. Different embedding models excel at different tasks—semantic search, recommendations, classification—and each comes with its own tradeoffs in accuracy, speed, and cost. Businesses want to mix and match models, balance premium performance with budget constraints, and stay resilient against model deprecation or API changes. Furthermore, rapid experimentation and adaptation are key to staying ahead and thus developers want models that offer flexible customization and full transparency. The Solution: SQL Server 2025 + NVIDIA Nemotron RAG SQL Server 2025 brings AI closer to your data, allowing you to natively and securely connect to any model hosted anywhere. You can generate embeddings directly in SQL using extensions to T-SQL —no need for new languages, frameworks, or third-party tools. By connecting SQL Server 2025 to the llama-nemotron-embed-1b-v2 embedding model from NVIDIA, you eliminate bottlenecks and deliver the massive throughput needed for real-time embedding generation. llama-nemotron-embed-1b-v2 is a best in class embedding model that offers multilingual and cross-lingual text question-answering retrieval with long context support and optimized data storage. This model is part of NVIDIA Nemotron RAG models, a collection of extraction, embedding, reranking models, fine-tuned with the Nemotron RAG datasets and scripts, to achieve the best accuracy. These models offer flexible customization, enabling easy fine-tuning and rapid experimentation. They also offer full transparency with open access to models, datasets, and scripts. Llama-nemotron-embed-1b-v2 is the model of choice for embedding workflows, but this high-speed inference pipeline is not limited to this model and can potentially call any optimized AI model as an NVIDIA NIM microservice, seamlessly powering every stage of the RAG pipeline. From multimodal data ingestion and advanced retrieval to reranking, all operations run directly on your data within SQL Server. Such RAG systems can be applied across a wide range of use cases, enabling intelligent, context-aware applications across industries. Customer Benefits: With GPU acceleration and built-in AI of SQL Server 2025, you can achieve optimal inference, ensuring performance that meets the demands of modern applications. Our flexible approach lets you mix and match models to suit different use cases, striking the right balance between accuracy and cost. And with open models that enable vendor flexibility and rapid adaptation, you gain resilience to stay ahead of the curve in an ever-changing AI landscape. Streamlining AI Model Deployment with Enterprise-Grade Confidence Customer Challenge Integrating advanced AI models into enterprise workflows has historically been slow and complex. Specialized teams must manage intricate software dependencies, configure infrastructure, and handle ongoing maintenance—all while navigating the risks of deploying unsupported models in mission-critical environments. This complexity slows innovation, drains engineering resources, and increases risk. The Solution: Simplified, Secure Model Deployment with NVIDIA NIM This collaboration simplifies and de-risks AI deployment. The llama-nemotron-embed-1b-v2 model is available as an NVIDIA NIM microservice for secure, reliable deployment across multiple Azure compute platforms. Prebuilt NIM containers for a broad spectrum of AI models and can be deployed with a single command for easy integration into enterprise-grade AI applications using built-in REST APIs of SQL Server 2025 and just a few lines of code, regardless where you run SQL Server workloads and NVIDIA NIM, on premises or in the cloud. NIM containers package the latest AI models together with the best inference technology from NVIDIA and the community and all dependencies into a ready-to-run container, abstracting away the complexity of environment setup so customers can spin up AI services quickly. Furthermore, NVIDIA NIM is enterprise-grade and is continuously managed by NVIDIA with dedicated software branches, rigorous validation processes, and support. As a result, developers can confidently integrate state-of-the-art AI into their data applications. This streamlined approach significantly reduces development overhead and provides the reliability needed for mission-critical enterprise systems. NVIDIA NIM containers are discoverable and deployable via Microsoft Azure AI Foundry’s model catalog. Customer Benefits Rapid deployment with minimal setup means you can start leveraging AI without specialized engineering, and SQL Server 2025 makes it even easier with built-in support for AI workloads and native REST APIs. Enterprise-grade security and monitoring ensure safe, reliable operations, while SQL Server’s integration with Entra ID and advanced compliance features provide added protection. Direct integration into SQL workflows reduces complexity and risk, and with SQL Server’s hybrid flexibility, you can run seamlessly across on-premises and cloud environments—simplifying modernization while maintaining control. Innovating Without Compromise on Security or Flexibility Customer Challenge Organizations in regulated industries often face a tough choice: adopt powerful AI or maintain strict data residency and compliance. Moving sensitive data to external services is often not an option, and many companies run AI inference workloads both in the cloud and on-premises to balance scalability, privacy, regulatory compliance, and low-latency requirements. The Solution: Flexible, Secure Integration—On-Premises and Cloud SQL Server 2025 enables organizations in regulated environments to securely integrate locally hosted AI models, ensuring data residency and compliance while minimizing network overhead. This architecture boosts throughput by keeping sensitive data on-premises and leveraging SQL Server’s native extensibility for direct model invocation. With SQL Server 2025 and Nemotron RAG, deployed as NVIDIA NIM microservices, you get the best of both worlds. This solution can be seamlessly deployed in the cloud with serverless NVIDIA GPUs on Azure Container Apps (ACA) or on-premises with NVIDIA GPUs on Azure Local. Sensitive data never leaves your secure environment, allowing you to harness the full power of Nemotron models while maintaining complete data sovereignty and meeting the strictest compliance mandates. Customer Benefits SQL Server 2025 helps you maintain compliance by supporting data residency and meeting regulatory standard requirements across regions. Sensitive data stays protected on-premises with enterprise-grade security, including consistent access controls, ledger support, and advanced encryption to minimize risk. At the same time, SQL Server’s hybrid flexibility lets you deploy AI workloads wherever they’re needed—on-premises, in the cloud, or across a hybrid environment—while leveraging built-in AI features like vector search and secure integration with locally hosted models for performance and control. Conclusion: Powering the Next Wave of Enterprise AI The collaboration between Microsoft and NVIDIA is more than a technical integration. It’s designed to help enterprises overcome the toughest challenges in AI deployment. By streamlining vector embedding and vector search, delivering enterprise-grade performance, and enabling secure, flexible integration across cloud and on-premises environments, this joint solution empowers organizations to unlock the full value of their data. Whether you’re building conversational AI, automating document analysis, or driving predictive insights, SQL Server 2025 and NVIDIA Nemotron RAG models, deployed as NIM, provide the tools you need to innovate with confidence. The future of enterprise AI is here and it’s flexible, secure, and built for real business impact. Get started today: Learn more about SQL Server 2025 and download it today Learn more about our joint solution from NVIDIA’s Technical Blog GitHub: Microsoft SQL Server 2025 and NVIDIA Nemotron RAGReimagining Data Excellence: SQL Server 2025 Accelerated by Pure Storage
SQL Server 2025 is a leap forward as enterprise AI-ready database, unifying analytics, modern AI application development, and mission-critical engine capabilities like security, high availability and performance from ground to cloud. Pure Storage’s all-Flash solutions are engineered to optimize SQL Server workloads, offering faster query performance, reduced latency, and simplified management. Together it helps customers accelerate the modernization of their data estate.Microsoft and PASS Summit are going on tour!
Microsoft and PASS Summit are going on tour! Join us for this two-day event Sep 15 - 16 in Dallas, TX, together with our partners Pure Storage. With keynotes, pre-cons, general sessions and more this event will cover all things SQL Server, Microsoft Fabric, Azure SQL and more. Connect with Microsoft and other community experts. Registertoday and take a peek into the agenda below: Pre-Con: Deep-Dive Workshop: Accelerating AI, Performance and Resilience with SQL Server 2025 SQL Server 2025 delivers powerful new capabilities for AI, developer productivity, and performance all ready to run at scale on modern infrastructure. In this 1/2 day deep dive workshop, you'll get a first look at what's new and how to put it to work immediately. Learn directly from Microsoft and Pure Storage experts how to harness SQL Server’s vector capabilities and walk through real-world demos covering semantic search, change event streaming, and using external tables to manage vector embeddings. You'll also see how new REST APIs securely expose SQL Server's internals for automation and observability including snapshots, performance monitoring, and backup management. The workshop wraps up with insights into core engine enhancements: optimized locking, faster backups using ZSTD compression all running on a modern Pure Storage foundation that brings scale and resilience to your data platform. Whether you're a DBA, developer, or architect, this session will equip you with practical strategies for harnessing Microsoft SQL Server 2025 and Pure Storage to accelerate your organization's AI and data goals. Day 2: Building an LLM Chatbot on Your Laptop - No Cloud Required! Want to build a chatbot that can answer questions using your own data? This session shows you how, and no cloud is required! In this session, you will learn how to build a Retrieval-Augmented Generation (RAG) chatbot using open-source tools combined with SQL Server for vector storage - all from your laptop. We will cover topics such as LLM fundamentals, embeddings, similarity search, and how to integrate LLMs with your own data. By the end of the session, you will have a working chatbot and practical knowledge of how AI can enhance your data platform and a new way to elevate your SQL Server skills with AI. Day 2: An Inside Look at Building SQL Server/Azure and Fabric Data Warehouse Have you ever wondered how Microsoft builds and releases its database engines (SQL Server, SQL Azure, Fabric Data Warehouse)? This talk goes through some of the behind-the-scenes details about how the engineering team works, how features come together, and how the engineers learn how to build the software you use to manage your data. Having the Regional Summit in Dallas gives us a unique opportunity to talk about our engineering office in Austin and how it contributed features and enhancements to recent releases. Come and learn about which SQL features are built right here in Texas! Day2: AI Ready Apps with SQL Database in Microsoft Fabric Explore how to build enterprise-grade Retrieval-Augmented Generation (RAG) systems by harnessing the power of SQL AI features, vector-based search, and Microsoft Fabric. This session delves into modern architectures that integrate structured data with large language model (LLM) capabilities to enable real-time, intelligent, and secure applications. And much more! Learn more: PASS Summit On Tour Dallas - PASS Data Community Summit Register today: PASS Summit On Tour
SQL Server 2025: introducing optimized Halloween protection
Executive summary Optimized Halloween protection, available in the public preview of SQL Server 2025 starting with the CTP 2.0 release, reduces tempdb space consumption and improves query performance by redesigning the way the database engine solves the Halloween problem. An example in the appendix shows CPU and elapsed time of a query reduced by about 50% while eliminating all tempdb space consumption. Update 2025-09-02 During public preview of SQL Server 2025, we identified a potential data integrity issue that might occur if optimized Halloween protection is enabled. While the probability of encountering this issue is low, we take data integrity seriously. Therefore, we temporarily removed optimized Halloween protection from SQL Server 2025, starting with the RC 0 release. The fix for this issue is in progress. In the coming months, we plan to make optimized Halloween protection available in Azure SQL Database and Azure SQL Managed Instance with the always-up-to-date update policy. Enabling optimized Halloween protection in a future SQL Server 2025 update is under consideration as well. The Halloween problem The Halloween problem, named so because it was discovered on Halloween in 1976, occurs when a data modification language (DML) statement changes data in such a way that the same statement unexpectedly processes the same row more than once. Traditionally, the SQL Server database engine protects DML statements from the Halloween problem by introducing a spool operator in the query plan, or by taking advantage of another blocking operator already present in the plan, such as a sort or a hash match. If a spool operator is used, it creates a temporary copy of the data to be modified before any modifications are made to the data in the table. While the protection spool avoids the Halloween problem, it comes with downsides: The spool requires extra resources: space in tempdb, disk I/O, memory, and CPU. Statement processing by the downstream query operators is blocked until the data is fully written into the spool. The spool adds query plan complexity that can cause the query optimizer to generate a less optimal plan. Optimized Halloween protection removes these downsides by making the spool operator unnecessary. How it works When accelerated database recovery (ADR) is enabled, each statement in a transaction obtains a unique statement identifier, known as nest ID. As each row is modified by a DML statement, it is stamped with the nest ID of the statement. This is required to provide the ACID transaction semantics with ADR. During DML statement processing, when the storage engine reads the data, it skips any row that has the same nest ID as the current DML statement. This means that the query processor doesn't see the rows already processed by the statement, therefore avoiding the Halloween problem. How to use optimized Halloween protection To enable optimized Halloween protection for a database, the following prerequisites are required: ADR must be enabled on the database. The database must use compatibility level 170. The OPTIMIZED_HALLOWEEN_PROTECTION database-scoped configuration must be enabled. The OPTIMIZED_HALLOWEEN_PROTECTION database-scoped configuration is enabled by default. This means that when you enable ADR for a database using compatibility level 170, it will use optimized Halloween protection. You can ensure that a database uses optimized Halloween protection by executing the following statements: ALTER DATABASE [<database-name-placeholder>] SET ACCELERATED_DATABASE_RECOVERY = ON WITH ROLLBACK IMMEDIATE; ALTER DATABASE [<database-name-placeholder>] SET COMPATIBILITY_LEVEL = 170; ALTER DATABASE SCOPED CONFIGURATION SET OPTIMIZED_HALLOWEEN_PROTECTION = ON; You can also enable and disable optimized Halloween protection at the query level by using the ENABLE_OPTIMIZED_HALLOWEEN_PROTECTION and DISABLE_OPTIMIZED_HALLOWEEN_PROTECTION query hints, either directly in the query, or via Query Store hints. These hints work under any compatibility level and take precedence over the OPTIMIZED_HALLOWEEN_PROTECTION database-scoped configuration. When optimized Halloween protection is used for an operator in the query plan, the OptimizedHalloweenProtectionUsed property of the operator in the XML query plan is set to True. For more details, see optimized Halloween protection in documentation. Conclusion Optimized Halloween protection is another Intelligent Query Processing feature that improves query performance and reduces resource consumption when you upgrade to SQL Server 2025, without having to make any changes to your query workloads. We are looking forward to your feedback about this and other features during the public preview of SQL Server 2025 and beyond. You can leave comments on this blog post, email us at intelligentqp@microsoft.com, or leave feedback at https://aka.ms/sqlfeedback. Appendix The following script shows how optimized Halloween protection removes the protection spool in the query plan, and reduces tempdb usage, CPU time, and duration when enabled. /* Requires the WideWorldImporters sample database. SQL Server backup: https://github.com/Microsoft/sql-server-samples/releases/download/wide-world-importers-v1.0/WideWorldImporters-Full.bak Bacpac: https://github.com/Microsoft/sql-server-samples/releases/download/wide-world-importers-v1.0/WideWorldImporters-Standard.bacpac */ /* Ensure that optimized Halloween protection prerequisites are in place */ ALTER DATABASE WideWorldImporters SET ACCELERATED_DATABASE_RECOVERY = ON WITH ROLLBACK IMMEDIATE; ALTER DATABASE WideWorldImporters SET COMPATIBILITY_LEVEL = 170; ALTER DATABASE SCOPED CONFIGURATION SET OPTIMIZED_HALLOWEEN_PROTECTION = ON; GO /* Validate configuration */ SELECT d.compatibility_level, d.is_accelerated_database_recovery_on, dsc.name, dsc.value FROM sys.database_scoped_configurations AS dsc CROSS JOIN sys.databases AS d WHERE dsc.name = 'OPTIMIZED_HALLOWEEN_PROTECTION' AND d.name = DB_NAME(); GO /* Create the test table and add data */ DROP TABLE IF EXISTS dbo.OptimizedHPDemo; BEGIN TRANSACTION; SELECT * INTO dbo.OptimizedHPDemo FROM Sales.Invoices ALTER TABLE dbo.OptimizedHPDemo ADD CONSTRAINT PK_OptimizedHPDemo PRIMARY KEY CLUSTERED (InvoiceID) ON USERDATA; COMMIT; GO /* Ensure that Query Store is enabled and is capturing all queries */ ALTER DATABASE WideWorldImporters SET QUERY_STORE = ON (OPERATION_MODE = READ_WRITE, QUERY_CAPTURE_MODE = ALL); /* Empty Query Store to start with a clean slate */ ALTER DATABASE WideWorldImporters SET QUERY_STORE CLEAR; GO /* Disable optimized Halloween protection as the baseline */ ALTER DATABASE SCOPED CONFIGURATION SET OPTIMIZED_HALLOWEEN_PROTECTION = OFF; GO /* Insert data selecting from the same table. This requires Halloween protection so that the same row cannot be selected and inserted repeatedly. */ BEGIN TRANSACTION; INSERT INTO dbo.OptimizedHPDemo ( InvoiceID, CustomerID, BillToCustomerID, OrderID, DeliveryMethodID, ContactPersonID, AccountsPersonID, SalespersonPersonID, PackedByPersonID, InvoiceDate, CustomerPurchaseOrderNumber, IsCreditNote, CreditNoteReason, Comments, DeliveryInstructions, InternalComments, TotalDryItems, TotalChillerItems, DeliveryRun, RunPosition, ReturnedDeliveryData, ConfirmedDeliveryTime, ConfirmedReceivedBy, LastEditedBy, LastEditedWhen ) SELECT InvoiceID + 1000000 AS InvoiceID, CustomerID, BillToCustomerID, OrderID, DeliveryMethodID, ContactPersonID, AccountsPersonID, SalespersonPersonID, PackedByPersonID, InvoiceDate, CustomerPurchaseOrderNumber, IsCreditNote, CreditNoteReason, Comments, DeliveryInstructions, InternalComments, TotalDryItems, TotalChillerItems, DeliveryRun, RunPosition, ReturnedDeliveryData, ConfirmedDeliveryTime, ConfirmedReceivedBy, LastEditedBy, LastEditedWhen FROM dbo.OptimizedHPDemo; ROLLBACK; GO /* Enable optimized Halloween protection. Execute the following statement in its own batch. */ ALTER DATABASE SCOPED CONFIGURATION SET OPTIMIZED_HALLOWEEN_PROTECTION = ON; GO /* Execute the same query again */ BEGIN TRANSACTION; INSERT INTO dbo.OptimizedHPDemo ( InvoiceID, CustomerID, BillToCustomerID, OrderID, DeliveryMethodID, ContactPersonID, AccountsPersonID, SalespersonPersonID, PackedByPersonID, InvoiceDate, CustomerPurchaseOrderNumber, IsCreditNote, CreditNoteReason, Comments, DeliveryInstructions, InternalComments, TotalDryItems, TotalChillerItems, DeliveryRun, RunPosition, ReturnedDeliveryData, ConfirmedDeliveryTime, ConfirmedReceivedBy, LastEditedBy, LastEditedWhen ) SELECT InvoiceID + 1000000 AS InvoiceID, CustomerID, BillToCustomerID, OrderID, DeliveryMethodID, ContactPersonID, AccountsPersonID, SalespersonPersonID, PackedByPersonID, InvoiceDate, CustomerPurchaseOrderNumber, IsCreditNote, CreditNoteReason, Comments, DeliveryInstructions, InternalComments, TotalDryItems, TotalChillerItems, DeliveryRun, RunPosition, ReturnedDeliveryData, ConfirmedDeliveryTime, ConfirmedReceivedBy, LastEditedBy, LastEditedWhen FROM dbo.OptimizedHPDemo; ROLLBACK; GO /* Examine query runtime statistics and plans for the two executions of the same query. */ SELECT q.query_id, q.query_hash, qt.query_sql_text, p.plan_id, rs.count_executions, rs.avg_tempdb_space_used * 8 / 1024. AS tempdb_space_mb, FORMAT(rs.avg_cpu_time / 1000., 'N0') AS avg_cpu_time_ms, FORMAT(rs.avg_duration / 1000., 'N0') AS avg_duration_ms, TRY_CAST(p.query_plan AS xml) AS xml_query_plan FROM sys.query_store_runtime_stats AS rs INNER JOIN sys.query_store_plan AS p ON rs.plan_id = p.plan_id INNER JOIN sys.query_store_query AS q ON p.query_id = q.query_id INNER JOIN sys.query_store_query_text AS qt ON q.query_text_id = qt.query_text_id WHERE q.query_hash = 0xC6ADB023512BBCCC; /* For the second execution with optimized Halloween protection: 1. tempdb space usage is zero 2. CPU time and duration are reduced by about 50% 3. The Clustered Index Insert operator in the query plan has the OptimizedHalloweenProtection property set to True */
