innodb_file_per_table
INFO
Rule IDs: io_008
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
- ON (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/innodb-parameters.html#sysvar_innodb_file_per_table
- Other vendors
What is checked
Rules that reference this variable, with their severity and what each rule detects:
- INFO
io_008: Enable innodb_file_per_table for easier maintenance, TRUNCATE TABLE performance, and individual table space management.
Tuning guidance
- Recommended actions:
- Enable innodb_file_per_table for easier maintenance, TRUNCATE TABLE performance, and individual table space management.
- Trade-offs: Higher I/O capacity values push more writes to disk, reducing lag and crash recovery time, but can saturate storage on spinning disks. Match settings to your storage hardware (SSD vs HDD).
Example
Consult the manual for whether SET GLOBAL, SET PERSIST, or SET SESSION applies.