mysql常用排查命令
1.查看服务器使用状态
mysqladmin -uroot -p -S /tmp/mysql.sock -r -i 1 ext |\awk -F"|" \"BEGIN{ count=0; }"\'{ if($2 ~ /Variable_name/ && ++count == 1){\ print "----------|---------|--- MySQL Command Status --|----- Innodb row operation ----|-- Buffer Pool Read --";\ print "---Time---|---QPS---|select insert update delete| read inserted updated deleted| logical physical";\}\else if ($2 ~ /Queries/){queries=$3;}\else if ($2 ~ /Com_select /){com_select=$3;}\else if ($2 ~ /Com_insert /){com_insert=$3;}\else if ($2 ~ /Com_update /){com_update=$3;}\else if ($2 ~ /Com_delete /){com_delete=$3;}\else if ($2 ~ /Innodb_rows_read/){innodb_rows_read=$3;}\else if ($2 ~ /Innodb_rows_deleted/){innodb_rows_deleted=$3;}\else if ($2 ~ /Innodb_rows_inserted/){innodb_rows_inserted=$3;}\else if ($2 ~ /Innodb_rows_updated/){innodb_rows_updated=$3;}\else if ($2 ~ /Innodb_buffer_pool_read_requests/){innodb_lor=$3;}\else if ($2 ~ /Innodb_buffer_pool_reads/){innodb_phr=$3;}\else if ($2 ~ /Uptime / && count >= 2){\ printf(" %s |%9d",strftime("%H:%M:%S"),queries);\ printf("|%6d %6d %6d %6d",com_select,com_insert,com_update,com_delete);\ printf("|%6d %8d %7d %7d",innodb_rows_read,innodb_rows_inserted,innodb_rows_updated,innodb_rows_deleted);\ printf("|%10d %11d\n",innodb_lor,innodb_phr);\}}' |
2.处理generlog
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3.查看无主键的表
select table_schema,table_name,TABLE_TYPE,ENGINE,ROW_FORMAT,TABLE_ROWS from information_schema.tables where (table_schema,table_name) not in (select distinct table_schema,table_name from information_schema.columns where COLUMN_KEY='PRI') and table_schema not in ('sys','mysql','information_schema','performance_schema' ); |
4.查看非innodb引擎表
select table_name,table_schema,engine from information_schema.tables where engine!='innodb' and table_schema not in('mysql','information_schema','performance_schema'); |
5.插卡行锁
select trx_tables_locked,trx_lock_structs,trx_wait_started,trx_state,trx_requested_lock_id from INNODB_TRX where trx_tables_locked != 0 or trx_wait_started is not NULL; |
6.查看进程信息
按客户端 IP 分组，看哪个客户端的链接数最多select client_ip,count(client_ip) as client_num from (select substring_index(host,':' ,1) as client_ip from processlist ) as connect_info group by client_ip order by client_num desc;查看正在执行的线程，并按 Time 倒排序，看看有没有执行时间特别长的线程select * from information_schema.processlist where Command != 'Sleep' and INFO like "%select%" order by Time desc\G;找出所有执行时间超过 5 分钟的线程，拼凑出 kill 语句，方便后面查杀select concat('kill ', id, ';') from information_schema.processlist where Command != 'Sleep' and Time > 300 order by Time desc; |
7.查看innodb行锁信息
innodb行锁信息
---------------查看innodb行锁信息----------------------SELECT p2.`HOST` Blockedhost,p2.`USER` BlockedUser, r.trx_id BlockedTrxId, r.trx_mysql_thread_id BlockedThreadId, r.trx_query BlockedQuery, l.lock_table BlockedTable, m.`lock_mode` BlockedLockMode, m.`lock_type` BlockedLockType, m.`lock_index` BlockedLockIndex, m.`lock_space` BlockedLockSpace, m.lock_page BlockedLockPage, m.lock_rec BlockedLockRec, m.lock_data BlockedLockData, p.`HOST` blocking_host, p.`USER` blocking_user, b.trx_id BlockingTrxid, b.trx_mysql_thread_id BlockingThreadId, b.trx_query BlockingQuery, l.`lock_mode` BlockingLockMode, l.`lock_type` BlockingLockType, l.`lock_index` BlockingLockIndex, l.`lock_space` BlockingLockSpace, l.lock_page BlockingLockPage, l.lock_rec BlockingLockRec, l.lock_data BlockingLockData, FROM INNER JOIN information_schema.INNODB_LOCKS l ON w.blocking_lock_id = l.lock_id AND l.`lock_trx_id`=b.`trx_id` INNER JOIN information_schema.INNODB_LOCKS m ON m.`lock_id`=w.`requested_lock_id` AND m.`lock_trx_id`=r.`trx_id` ORDER BY WaitTime DESC \G;----------------------对应的中文------------------------SELECT p2.`HOST` 被阻塞方host, p2.`USER` 被阻塞方用户, r.trx_id 被阻塞方事务id, r.trx_mysql_thread_id 被阻塞方线程号, r.trx_query 被阻塞的查询, l.lock_table 阻塞方锁住的表, m.`lock_mode` 被阻塞方的锁模式, m.`lock_type` "被阻塞方的锁类型(表锁还是行锁)", m.`lock_index` 被阻塞方锁住的索引, m.`lock_space` 被阻塞方锁对象的space_id, m.lock_page 被阻塞方事务锁定页的数量, m.lock_rec 被阻塞方事务锁定行的数量, m.lock_data 被阻塞方事务锁定记录的主键值, p.`HOST` 阻塞方主机, p.`USER` 阻塞方用户, b.trx_id 阻塞方事务id, b.trx_mysql_thread_id 阻塞方线程号, b.trx_query 阻塞方查询, l.`lock_mode` 阻塞方的锁模式, l.`lock_type` "阻塞方的锁类型(表锁还是行锁)", l.`lock_index` 阻塞方锁住的索引, l.`lock_space` 阻塞方锁对象的space_id, l.lock_page 阻塞方事务锁定页的数量, l.lock_rec 阻塞方事务锁定行的数量, l.lock_data 阻塞方事务锁定记录的主键值, FROM INNER JOIN information_schema.INNODB_LOCKS l ON w.blocking_lock_id = l.lock_id AND l.`lock_trx_id`=b.`trx_id` INNER JOIN information_schema.INNODB_LOCKS m ON m.`lock_id`=w.`requested_lock_id` AND m.`lock_trx_id`=r.`trx_id` ORDER BY 等待时间 DESC \G; |
