log_error_verbosity
INFO
Rule IDs: lg_005
Overview
- Purpose
- Documented in the MySQL 8.4 manual as a server system variable (scope: Global). Purpose and semantics are described at the linked manual page.
- Dynamic (MySQL 8.4 reference)
- MySQL 8.4 marks this variable as dynamic (
Dynamic= Yes). Runtime changes useSET GLOBAL(global scope) orSET SESSION(session scope) — confirm syntax and persistence (SET PERSIST) in the manual. - Default value
- 2 (MySQL 8.4)
- Version and product notes
- MariaDB and Percona Server may use different names, defaults, or dynamic behavior; verify their documentation.
- Documentation
- https://dev.mysql.com/doc/refman/8.4/en/server-system-variables.html#sysvar_log_error_verbosity
- Other vendors
What is checked
Rules that reference this variable, with their severity and what each rule detects:
- INFO
lg_005: Set log_error_verbosity=3 (notes + warnings + errors) for comprehensive diagnostics in production.
Tuning guidance
- Recommended actions:
- Set log_error_verbosity=3 (notes + warnings + errors) for comprehensive diagnostics in production.
- Trade-offs: Enabling slow query log and performance_schema adds observability but consumes some I/O and CPU. General log should never be enabled in production due to extreme I/O overhead.
Example
SET GLOBAL log_error_verbosity = 3; -- Errors + warnings + notes
Always validate on a non-production instance first. Use SET PERSIST (MySQL 8.0+) for changes that should survive restarts.