经常用到的mysql性能指标 一，获取mysql用户下的进程总数ps -ef | awk '{print $1}' | grep mysql | grep -v grep | wc-1二，主机性能状态# uptime[root@ ~]# uptime 13:05:52 up 53 days, 52 min, 1 user, load average: 0.00, 0.00, 0.00三，cpu使用率# top或# vmstat四，磁盘io量# vmstat 或 # iostat 五，swap进出量[内存]# free六，数据库性能状态(1)qps(每秒query量)qps = questions(or queries) / secondsmysql > show /*50000 global */ status like 'question';(2)tps(每秒事务量) tps = (com_commit + com_rollback) / secondsmysql > show status like 'com_commit';mysql > show status like 'com_rollback'; (3)key buffer 命中率key_buffer_read_hits = (1-key_reads / key_read_requests) * 100%key_buffer_write_hits = (1-key_writes / key_write_requests) * 100%mysql> show status like 'key%'; (4)innodb buffer命中率innodb_buffer_read_hits = (1 - innodb_buffer_pool_reads / innodb_buffer_pool_read_requests) * 100%mysql> show status like 'innodb_buffer_pool_read%';(5)query cache命中率query_cache_hits = (qcahce_hits / (qcache_hits + qcache_inserts )) * 100%;mysql> show status like 'qcache%'; (6)table cache状态量mysql> show status like 'open%';(7)thread cache 命中率thread_cache_hits = (1 - threads_created / connections ) * 100%mysql> show status like 'thread%';mysql> show status like 'connections';(8)锁定状态mysql> show status like '%lock%'; (9)复制延时量mysql > show slave status(10) tmp table 状况(临时表状况)mysql > show status like 'create_tmp%';(11) binlog cache 使用状况mysql > show status like 'binlog_cache%';(12) innodb_log_waits 量mysql > show status like 'innodb_log_waits'; bitscn.com