运行中的mysql状态查看mysql
对正在运行的mysql进行监控,其中一个方式就是查看mysql运行状态。 sql
(1)QPS(每秒Query量) 优化
QPS = Questions(or Queries) / uptimespa
mysql > show global status like 'Question%'; 排序
mysql > show global status like 'uptime%'; 事务
(2)TPS(每秒事务量) requests
TPS = (Com_commit + Com_rollback) / uptimeit
mysql > show global status like 'Com_commit'; io
mysql > show global status like 'Com_rollback'; innodb
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% 若是这个比值比较大的话,说明表锁形成的阻塞比较严重
Innodb_row_lock_waits innodb行锁,太大多是间隙锁形成的
(9)复制延时量
mysql > show slave status
查看延时时间
(10) Tmp Table 情况(临时表情况)
mysql > show status like 'Create_tmp%';
Created_tmp_disk_tables/Created_tmp_tables比值最好不要超过10%,若是Created_tmp_tables值比较大,
多是排序句子过多或者是链接句子不够优化
(11) Binlog Cache 使用情况
mysql > show status like 'Binlog_cache%';
若是Binlog_cache_disk_use值不为0 ,可能须要调大 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,代表 innodb log buffer 由于空间不足而等待
好比命令:
>#show global status;
虽然能够使用:
>#show global status like %...%;
来过滤,可是对应长长的list,每一项都表明什么意思,仍是有必要弄清楚。