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5.7 中的performance_schema 已经有能力监控mysql 的内存使用情况了，对于这一点也是要通过instrument 来实现的，由于内存这一块没有对应的consumer 所以只要
配置好instrument 就行了
1、例子：
/etc/my.cnf
[mysqld] datadir =/usr/local/mysql/data basedir =/usr/local/mysql performance_schema_instrument =‘memory%=counted‘
select event_name,current_alloc from sys.memory_global_by_current_bytes limit 10; +-----------------------------------------------------------------------------+---------------+ | event_name | current_alloc | +-----------------------------------------------------------------------------+---------------+ | memory/innodb/buf_buf_pool | 131.06 MiB | | memory/innodb/log0log | 32.01 MiB | | memory/performance_schema/events_statements_history_long | 13.66 MiB | | memory/performance_schema/events_statements_history_long.sqltext | 9.77 MiB | | memory/performance_schema/events_statements_history_long.tokens | 9.77 MiB | | memory/performance_schema/events_statements_summary_by_digest.tokens | 9.77 MiB | | memory/performance_schema/table_handles | 9.06 MiB | | memory/performance_schema/events_statements_summary_by_thread_by_event_name | 8.67 MiB | | memory/mysys/KEY_CACHE | 8.00 MiB | | memory/performance_schema/memory_summary_by_thread_by_event_name | 5.62 MiB | +-----------------------------------------------------------------------------+---------------+
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原文地址：http://www.cnblogs.com/JiangLe/p/5947413.html
