information_schema系统表——GLOBAL_STATUS and SESSION_STATUS

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本文介绍了MySQL 5.7.6版本中关于状态变量的信息模式表格变化，包括这些表格如何受到show_compatibility_56系统变量的影响，以及如何迁移到Performance Schema表格来替代已废弃的INFORMATION_SCHEMA表格。

Note

As of MySQL 5.7.6, the value of the show_compatibility_56 system variable affects the information available from the tables described here. For details, see the description of that variable in Section 5.1.5, “Server System Variables”.

Note

As of MySQL 5.7.6, information available from the tables described here is also available from the Performance Schema. The INFORMATION_SCHEMAtables are deprecated in preference to the Performance Schema tables and will be removed in a future MySQL release. For advice on migrating away from the INFORMATION_SCHEMA tables to the Performance Schema tables, see Section 25.19, “Migrating to Performance Schema System and Status Variable Tables”.

The GLOBAL_STATUS and SESSION_STATUS tables provide information about server status variables. Their contents correspond to the information produced by the SHOW GLOBAL STATUS and SHOW SESSION STATUS statements (see Section 13.7.5.35, “SHOW STATUS Syntax”).