(1) QPS(每秒Query量) QPS = Questions(or Queries) / uptime mysql> show global status like 'Question%'; mysql> show global status like 'uptime';
(2) TPS(每秒事务量) TPS = (Com_commit + Com_rollback) / uptime mysql > show global status like 'Com_commit'; mysql > show global status like 'Com_rollback'; mysql> show global status like 'uptime';
(3)key Buffer 命中率 mysql>show global status like 'key%'; key_buffer_read_hits = (1-key_reads /key_read_requests) * 100% key_buffer_write_hits = (1-key_writes /key_write_requests) * 100%
(4)InnoDB Buffer命中率 mysql> show status like 'innodb_buffer_pool_read%'; innodb_buffer_read_hits = (1 -innodb_buffer_pool_reads / innodb_buffer_pool_read_requests) * 100%
(5)Query Cache命中率 mysql> show status like 'Qcache%'; Query_cache_hits = (Qcahce_hits /(Qcache_hits + Qcache_inserts )) * 100%;
(6)Table Cache状态量 mysql> show global status like 'open%'; 比较 open_tables 与opend_tables值
(7)Thread Cache 命中率 mysql> show global status like'Thread%'; mysql> show global status like'Connections'; Thread_cache_hits = (1 - Threads_created /connections ) * 100%
(8)锁定状态 mysql> show global status like '%lock%'; Table_locks_waited/Table_locks_immediate=0.3% 如果这个比值比较大的话，说明表锁造成的阻塞比较严重 Innodb_row_lock_waits innodb行锁，太大可能是间隙锁造成的
(9)复制延时量 mysql > show slave status 查看Seconds_Behind_Master的值，如果为0，说明没有延迟
(10) Tmp Table 状况(临时表状况) mysql > show global status like 'Created_tmp%'; Created_tmp_disk_tables/Created_tmp_tables比值最好不要超过10%，如果Created_tmp_tables值比较大， 可能是排序句子过多或者是连接句子不够优化
(11) Binlog Cache 使用状况 mysql > show global status like 'Binlog_cache%'; 如果Binlog_cache_disk_use值不为0 ，可能需要调大 binlog_cache_size大小
(12) Innodb_log_waits 量 mysql > show status like'innodb_log_waits'; Innodb_log_waits值不等于0的话，表明 innodblog buffer 因为空间不足而等待
(13)open file and table mysql> show global status like 'Open_files'; mysql> show global status like 'Open_tables';
(14) 慢查询 开启慢查询： 1).手动执行命令开启: mysql> set global slow_query_log=on; mysql> set global long_query_time=1;
