show_compatibility_56

--从mysql5.7.6开始information_schema.global_status已经开始被舍弃，为了兼容性，此时需要打开 show_compatibility_56mysql> select * from information_schema.global_status limit 3;ERROR 3167 (HY000): The 'INFORMATION_SCHEMA.GLOBAL_STATUS' feature is disabled; see the documentation for 'show_compatibility_56'--查看show_compatibility_56其值mysql> show variables like '%show_compatibility_56%';+-----------------------+-------+| Variable_name         | Value |+-----------------------+-------+| show_compatibility_56 | OFF   |+-----------------------+-------+1 row in set (0.01 sec)--把show_compatibility_56打开mysql> set global show_compatibility_56=on;Query OK, 0 rows affected (0.00 sec)mysql> show variables like '%show_compatibility_56%';+-----------------------+-------+| Variable_name         | Value |+-----------------------+-------+| show_compatibility_56 | ON    |+-----------------------+-------+1 row in set (0.00 sec)mysql> select * from information_schema.global_status limit 3;+-----------------------+----------------+| VARIABLE_NAME         | VARIABLE_VALUE |+-----------------------+----------------+| ABORTED_CLIENTS       | 0              || ABORTED_CONNECTS      | 0              || BINLOG_CACHE_DISK_USE | 0              |+-----------------------+----------------+3 rows in set, 1 warning (0.00 sec)In MySQL 5.6, system and status variable information is available from these SHOW statements:SHOW VARIABLESSHOW STATUSAnd from these INFORMATION_SCHEMA tables:INFORMATION_SCHEMA.GLOBAL_VARIABLESINFORMATION_SCHEMA.SESSION_VARIABLESINFORMATION_SCHEMA.GLOBAL_STATUSINFORMATION_SCHEMA.SESSION_STATUSMySQL 5.7As of MySQL 5.7.6, the Performance Schema includes these tables as new sources of system and statusvariable information:performance_schema.global_variablesperformance_schema.session_variablesperformance_schema.variables_by_threadperformance_schema.global_statusperformance_schema.session_statusperformance_schema.status_by_threadperformance_schema.status_by_accountperformance_schema.status_by_hostperformance_schema.status_by_user