Semaphore Watchdog Crash Under High Concurrency (Doc ID 2929296.1)

Last updated on FEBRUARY 19, 2023

Applies to:

MySQL Database Service - Version N/A to N/A
Information in this document applies to any platform.

Platform was running fine until 17:30 UTC when service stopped responding to connections, queries and everything else.

On checking the performance_schema.error_log table, it shows the semaphore watchdog exceeding the limit and forcing a planned crash of the server:

Changes
If there are changes in the environment, product, account and hardware that trigger the problem describe them.

MySQL instance was migrated from AWS/RDS to MySQL Database Service/OCI.

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In this Document

Symptoms

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