D. System, Status, and User Variable Reference
This appendix describes several types of MySQL variables:
• System variables that you can set to configure the server or check to obtain the current configuration
• Status variables that provide information about the server’s current operational state
• User variables that you can define, assign values to, and refer to in expressions
Values for variables that represent buffer sizes or lengths generally are given in bytes. Exceptions are noted as necessary.
Unless otherwise indicated, the variables listed here have been present in MySQL at least as early as MySQL 5.5.0. Variables that were introduced or that have changed in meaning since then are noted.
D.1. System Variables
System variables provide ...
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