IIS uses worker processes (w3wp.exe file in Windows) to handle client requests. If w3wp.exe crashes, your users cannot access to your application until the process starts again. In Event Viewer, you may see the exception codes 0xc0000005 and 0xe0434352 recorded during crashes.
Exception descriptions from Event Viewer are below. “Faulting module name” refers to the component that causes the crash.
Based on the logs above, there are two exception codes that lead to the root cause:
OraOps12.dll. This is a part of Oracle Data Access Components (ODAC). Upgrading or repairing the related module could fix the issue.