Chapter 26 The INFORMATION_SCHEMA GLOBAL_VARIABLES and SESSION_VARIABLES Tables

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 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_SCHEMA tables 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 Migrating to Performance Schema System and Status Variable Tables.

The GLOBAL_VARIABLES and SESSION_VARIABLES tables provide information about server status variables. Their contents correspond to the information produced by the SHOW GLOBAL VARIABLES and SHOW SESSION VARIABLES statements (see SHOW VARIABLES Syntax).

Notes

• The VARIABLE_VALUE column for each of these tables is defined as VARCHAR(1024). For variables with very long values that are not completely displayed, use SELECT as a workaround. For example:

  SELECT @@GLOBAL.innodb_data_file_path;