使用mysqladmin检测MySQL运行状态的教程
mysqladmin是MySQL一个重要的客户端,最常见的是使用它来关闭数据库,除此,该命令还可以了解MySQL运行状态、进程信息、进程杀死等。本文介绍一下如何使用mysqladminextended-status(因为没有"歧义",所以可以使用ext代替)了解MySQL的运行状态。
1.使用-r/-i参数
使用mysqladminextended-status命令可以获得所有MySQL性能指标,即showglobalstatus的输出,不过,因为多数这些指标都是累计值,如果想了解当前的状态,则需要进行一次差值计算,这就是mysqladminextended-status的一个额外功能,非常实用。默认的,使用extended-status,看到也是累计值,但是,加上参数-r(--relative),就可以看到各个指标的差值,配合参数-i(--sleep)就可以指定刷新的频率,那么就有如下命令:
mysqladmin-uroot-r-i1-pxxxextended-status +------------------------------------------+----------------------+ |Variable_name|Value| +------------------------------------------+----------------------+ |Aborted_clients|0| |Com_select|336| |Com_insert|243| ...... |Threads_created|0| +------------------------------------------+----------------------+
2.配合grep使用
配合grep使用,我们就有:
mysqladmin-uroot-r-i1-pxxxextended-status\ |grep"Questions\|Queries\|Innodb_rows\|Com_select\|Com_insert\|Com_update\|Com_delete" |Com_delete|1| |Com_delete_multi|0| |Com_insert|321| |Com_select|286| |Com_update|63| |Innodb_rows_deleted|1| |Innodb_rows_inserted|207| |Innodb_rows_read|5211| |Innodb_rows_updated|65| |Queries|2721| |Questions|2721|
3.配合简单的awk使用
使用awk,同时输出时间信息:
mysqladmin-uroot-p-h127.0.0.1-P3306-r-i1ext|\ awk-F"|"'{\ if($2~/Variable_name/){\ print"<-------------"strftime("%H:%M:%S")"------------->";\ }\ if($2~/Questions|Queries|Innodb_rows|Com_select|Com_insert|Com_update|Com_delete|Innodb_buffer_pool_read_requests/)\ print$2$3;\ }' <-------------12:38:49-------------> Com_delete0 Com_insert0 Com_select0 Com_update0 Innodb_buffer_pool_read_requests589 Innodb_rows_deleted0 Innodb_rows_inserted2 Innodb_rows_read50 Innodb_rows_updated50 Queries105 Questions1 <-------------12:38:50-------------> Com_delete0 Com_insert0 Com_select0 Com_update0 Innodb_buffer_pool_read_requests1814 Innodb_rows_deleted0 Innodb_rows_inserted0 Innodb_rows_read8 Innodb_rows_updated8 Queries17 Questions1
4.配合复杂一点的awk
反正也不简单了,那就更复杂一点,这样让输出结果更友好点,因为awk不支持动态变量,所以代码看起来比较复杂:
mysqladmin-P3306-uroot-p-h127.0.0.1-r-i1ext|\ awk-F"|"\ "BEGIN{count=0;}"\ '{if($2~/Variable_name/&&((++count)%20==1)){\ print"----------|---------|---MySQLCommandStatus--|-----Innodbrowoperation----|--BufferPoolRead--";\ print"---Time---|---QPS---|selectinsertupdatedelete|readinsertedupdateddeleted|logicalphysical";\ }\ elseif($2~/Queries/){queries=$3;}\ elseif($2~/Com_select/){com_select=$3;}\ elseif($2~/Com_insert/){com_insert=$3;}\ elseif($2~/Com_update/){com_update=$3;}\ elseif($2~/Com_delete/){com_delete=$3;}\ elseif($2~/Innodb_rows_read/){innodb_rows_read=$3;}\ elseif($2~/Innodb_rows_deleted/){innodb_rows_deleted=$3;}\ elseif($2~/Innodb_rows_inserted/){innodb_rows_inserted=$3;}\ elseif($2~/Innodb_rows_updated/){innodb_rows_updated=$3;}\ elseif($2~/Innodb_buffer_pool_read_requests/){innodb_lor=$3;}\ elseif($2~/Innodb_buffer_pool_reads/){innodb_phr=$3;}\ elseif($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);\ }}' ----------|---------|---MySQLCommandStatus--|-----Innodbrowoperation----|--BufferPoolRead-- ---Time---|---QPS---|selectinsertupdatedelete|readinsertedupdateddeleted|logicalphysical 10:37:13|2231|274214700|4811160710|41460 10:37:14|2972|4032568423|25091738523|45450 10:37:15|2334|282232661|1266154671|35430 10:37:15|2241|271217660|1160129660|29350 10:37:17|2497|299224970|1141149950|38310 10:37:18|2871|3523047423|82022267323|61670 10:37:19|2441|284233820|1099121780|32920 10:37:20|2342|279242610|1083224610|33660
就这样了,这几个命令自己用的比较多,随手分享出来。