MYSQL常用的性能指标总结和归纳
(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;
2).编辑/etc/my.cnf,在[mysqld]域中添加:
slow_query_log= 1 # 开启慢查询
slow_query_log_file=/data/data/localhost-slow.log # 慢查询日志路径
long_query_time= 1 # 慢查询的时长
(15)全日志
查看全日志:
show global variables like 'general_log';
开启全日志:
set global general_log=on;
注意开启全日志会消耗服务器性能,一般只有在排查问题时才会短暂打开。
网页标题:MYSQL常用的性能指标总结和归纳
文章出自:http://scyanting.com/article/geisjh.html
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;
2).编辑/etc/my.cnf,在[mysqld]域中添加:
slow_query_log= 1 # 开启慢查询
slow_query_log_file=/data/data/localhost-slow.log # 慢查询日志路径
long_query_time= 1 # 慢查询的时长
(15)全日志
查看全日志:
show global variables like 'general_log';
开启全日志:
set global general_log=on;
注意开启全日志会消耗服务器性能,一般只有在排查问题时才会短暂打开。
网页标题:MYSQL常用的性能指标总结和归纳
文章出自:http://scyanting.com/article/geisjh.html