mysql中的监控与优化过程是怎样的,很多新手对此不是很清楚,为了帮助大家解决这个难题,下面小编将为大家详细讲解,有这方面需求的人可以来学习下,希望你能有所收获。
mysql> show global status like 'Com%';
mysql> show global status like 'Queries';
+---------------+---------+
| Variable_name | Value |
+---------------+---------+
| Queries | 1983766 |
+---------------+---------+
1 row in set (0.00 sec)
QPS = ( Queries 2- Queries 1 ) / 间隔时间
mysql> show global status where variable_name in ('Queries','uptime');
+---------------+---------+
| Variable_name | Value |
+---------------+---------+
| Queries | 1983768 |
| Uptime | 1364443 |
+---------------+---------+
2 rows in set (0.00 sec)
mysql> show global status where variable_name in ('com_insert','com_update','com_delete','uptime');
+---------------+---------+
| Variable_name | Value |
+---------------+---------+
| Com_delete | 23676 |
| Com_insert | 793072 |
| Com_update | 259586 |
| Uptime | 1364651 |
+---------------+---------+
4 rows in set (0.00 sec)
Transaction_sum= Com_delete+ Com_insert+ Com_update
TPS = (Transaction_sum 2 - Transaction_sum 1 ) / (time 2 - time 1)
mysql> show global status like 'Threads_running';
+-----------------+-------+
| Variable_name | Value |
+-----------------+-------+
| Threads_running | 2 |
+-----------------+-------+
1 row in set (0.01 sec)
# 最大连接数
mysql> show global status like 'max_used_connections%';
+---------------------------+---------------------+
| Variable_name | Value |
+---------------------------+---------------------+
| Max_used_connections | 22 |
| Max_used_connections_time | 2019-09-04 13:49:52 |
+---------------------------+---------------------+
2 rows in set (0.00 sec)
# 当前连接数
mysql> show global status like 'threads_connected';
+-------------------+-------+
| Variable_name | Value |
+-------------------+-------+
| Threads_connected | 2 |
+-------------------+-------+
1 row in set (0.01 sec)
##从缓存中读取的次数
mysql> show global status like 'innodb_buffer_pool_read_requests';
+----------------------------------+----------+
| Variable_name | Value |
+----------------------------------+----------+
| Innodb_buffer_pool_read_requests | 16217299 |
+----------------------------------+----------+
1 row in set (0.00 sec)
##从物理磁盘读取的次数
mysql> show global status like 'innodb_buffer_pool_reads';
+--------------------------+-------+
| Variable_name | Value |
+--------------------------+-------+
| Innodb_buffer_pool_reads | 2067 |
+--------------------------+-------+
1 row in set (0.00 sec)
缓存命中率 = ( innodb_buffer_pool_read_requests - innodb_buffer_pool_reads ) /
innodb_buffer_pool_reads * 100%
周期连接,执行查询:select @ @version; 或 select user();
mysqladmin -uroot -pxxx -hxxxx ping
##< mysql 5.7
SELECT b.trx_mysql_thread_id as '被阻塞的线程',
b.trx_query as '被阻塞的SQL',
c.trx_mysql_thread_id as '阻塞线程',
c.trx_query as '阻塞SQL',
UNIX_TIMESTAMP()-UNIX_TIMESTAMP(c.trx_started)) as '阻塞时间'
FROM information_schema.INNODB_LOCK_WAITS a
JOIN information_schema.INNODB_TRX b ON a.requesting_trx_id=b.trx_id
JOIN information_schema.INNODB_TRX c ON a.blocking_trx_id=c.trx_id
WHERE (UNIX_TIMESTAMP()-UNIX_TIMESTAMP(c.trx_started))>30
##> mysql 5.7
SELECT waiting_pid AS '被阻塞的线程',
waiting_query AS '被阻塞的SQL',
blocking_pid AS '阻塞线程',
blocking_query AS '阻塞SQL',
wait_age AS '阻塞时间',
sql_kill_blocking_query AS '建议操作'
FROM sys.innodb_lock_waits
WHERE (UNIX_TIMESTAMP()-UNIX_TIMESTAMP(wait_started))>30
##pt工具
pt-deadlock-logger u=admin, p=123456, h=127.0.0.1 \
--create-dest-table \
--dest u=admin,p=123456, h=127.0.0.1.D=dba,t=deadlock
##全局参数,日志监控
mysql> set persist innodb_print_all_deadlocks=on;
监控慢查询日志
通过information_shcema.processlist表实时监控
show slave status\G
pt-heartbeat
##主库
pt-heartbeat --user=xx --password=xxx -h master --create-table --database xxx --update --daemonize --interval=1
##从库
pt-hearbeat --user=xx --password=xx -h slave --database xxx
--monitor --daemonize --log /tmp/slave_lag.log
show slave status\G
IO/SQL 两个线程状态(yes or no)
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