Optimizing a Terabyte-Scale Azure SQL Database
Question Description: A customer has designed a database schema for a Terabyte-level Azure SQL database, but the original design lacks a unique key. As the data volume increases, performance issues become more pronounced. To address these performance issues, Azure SQL uses a hidden index with uniqueifier identifiers, which have a maximum limit of 2,147,483,648. When the number of data rows in a table exceeds 2.1 billion, any insert or update operations will result in the following error: Msg 666, Level 16, State 2, Line 25 This error can lead to partial or complete database outages, severely impacting business operations.