log_queries_not_using_indexes
INFO
Rule IDs: lg_003
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
- Default depends on MySQL version, build, and platform — see the manual page for this variable.
- 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_queries_not_using_indexes
- Other vendors
What is checked
Rules that reference this variable, with their severity and what each rule detects:
- INFO
lg_003: Enable log_queries_not_using_indexes=ON. Pair with min_examined_row_limit > 0 to reduce noise.
Tuning guidance
- Recommended actions:
- Enable log_queries_not_using_indexes=ON. Pair with min_examined_row_limit > 0 to reduce noise.
- 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
Consult the manual for whether SET GLOBAL, SET PERSIST, or SET SESSION applies.