標籤:mysql show status 資料庫狀態
show [global | session] status [like ‘xxx‘];
global選項,查看mysql所有串連狀態
session選項,查看當前串連狀態,預設session選項
flush status;可以將很多狀態值重設清零。
擷取mysql使用者進程總數
ps -ef |awk ‘{print $1}‘ |grep mysql |grep -v "grep" |wc -l
查看mysql當前串連數
netstat -an |grep 3306 |grep "ESTABLISHED" |wc -l
查看主機效能狀態
uptime
11:03:30 up 91 days, 9:48, 3 users, load average: 0.70, 0.91, 2.63
查看伺服器啟動時間長度,使用者數,負載
top vmstat,top 查看cpu使用率
vmstat iostat 查看io狀態
free -h 查看記憶體使用量情況
資料庫效能狀態查詢:
1)QPS每秒query量
show global status like ‘Question%‘;
+---------------+----------+
| Variable_name | Value |
+---------------+----------+
| Questions | 39661402 |
+---------------+----------+
2)TPS每秒事務量
show global status like ‘Com_commit‘;
+---------------+---------+
| Variable_name | Value |
+---------------+---------+
| Com_commit | 8495153 |
+---------------+---------+
show global status like ‘Com_rollback‘;
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| Com_rollback | 0 |
+---------------+-------+
(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狀態量
mysql> show global status like ‘open%‘;
比較 open_tables 與 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)鎖定狀態
mysql> show global status like ‘%lock%‘;
Table_locks_waited/Table_locks_immediate=0.3% 如果這個比值比較大的話,說明表鎖造成的阻塞比較嚴重
Innodb_row_lock_waits innodb行鎖,太大可能是間隙鎖造成的
(9)複製延時量
mysql > show slave status
查看延時時間
(10) Tmp Table 狀況(暫存資料表狀況)
mysql > show status like ‘Create_tmp%‘;
Created_tmp_disk_tables/Created_tmp_tables比值最好不要超過10%,如果Created_tmp_tables值比較大,
可能是排序句子過多或者是串連句子不夠最佳化
(11) Binlog Cache 使用狀況
mysql > show status like ‘Binlog_cache%‘;
如果Binlog_cache_disk_use值不為0 ,可能需要調大 binlog_cache_size大小
(12) Innodb_log_waits 量
mysql > show status like ‘innodb_log_waits‘;
Innodb_log_waits值不等於0的話,表明 innodb log buffer 因為空白間不足而等待
13)show variables like ‘%timeout%‘;查看連線逾時配置
mysql查看資料庫狀態show status