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一个Shell小脚本精准统计Mysql每张表的行数实现

2020-07-27 18:43:55
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前言

对于开发或者运维人员来说,Mysql数据库每张表的数量肯定是要了解下,有助于我们清理无用数据或者了解哪张表比较占用空间。

另外多次统计表的行数,还能发现Mysql表的增量情况,能够预测表未来会有多大的量。

废话不多说,直接带大家写一个简单的Shell小脚本

循环获取数据库名

直接上Shell代码,show databases获取所有的库名。结果有一个我们不想要的,就是Database,这个grep -v掉,轻松获取所有数据库

[root@shijiangeit ~]# mysql -h 127.0.0.1 -uxxx -pxxx -e "show databases;" 2>/dev/null+--------------------+| Database      |+--------------------+| information_schema || mysql       || performance_schema || shijiange     || test        || wordpress     |+--------------------+
[root@shijiangeit ~]# mysql -h 127.0.0.1 -uxxx -pxxx -e "show databases;" 2>/dev/null |grep -v Databaseinformation_schemamysqlperformance_schemashijiangetestwordpress

循环获取所有表

有了库信息,获取所有表就简单了,直接上Shell代码。show tables获取所有表名,其中Tables_in不需要,grep -v掉。

[root@shijiangeit ~]# for onedb in $(mysql -h 127.0.0.1 -uxxx -pxxx -e "show databases;" 2>/dev/null |grep -v Database);do>  echo $onedb>  mysql -h 127.0.0.1 -uxxx -pxxx $onedb -e "show tables" 2>/dev/null> doneinformation_schema+---------------------------------------+| Tables_in_information_schema     |+---------------------------------------+| CHARACTER_SETS            || COLLATIONS              || COLLATION_CHARACTER_SET_APPLICABILITY || COLUMNS                || COLUMN_PRIVILEGES           || ENGINES                || EVENTS                || FILES                 || GLOBAL_STATUS             || GLOBAL_VARIABLES           || KEY_COLUMN_USAGE           |

循环统计每张表的行数

取出库名加表名,一个select count(1)统计表的行数,循环统计,直接上Shell代码。

[root@shijiangeit ~]# for onedb in $(mysql -h 127.0.0.1 -uxxx -pxxx -e "show databases;" 2>/dev/null |grep -v Database);do>  for onetab in $(mysql -h 127.0.0.1 -uxxx -pxxx $onedb -e "show tables" 2>/dev/null |grep -v 'Tables_in_');do>   onetablength=$(mysql -h 127.0.0.1 -uxxx -pxxx $onedb -e "select count(1) from $onetab" 2>/dev/null |grep -v 'count')>   echo -e "$onedb.$onetab/t$onetablength">  done> doneinformation_schema.CHARACTER_SETS  40information_schema.COLLATIONS  219information_schema.COLLATION_CHARACTER_SET_APPLICABILITY  219information_schema.COLUMNS 1789information_schema.COLUMN_PRIVILEGES  0shijiange.logincount  4shijiange.member  0shijiange.user 2097153test.detect_servers 0wordpress.wp_commentmeta  0wordpress.wp_comments  0wordpress.wp_links 0wordpress.wp_options  156

变量化,脚本直接用

需要统计哪个Mysql,前面三个变量一改,立马就能统计所有表的大小了。

mysqlhost=127.0.0.1mysqluser=xxxmysqlpassword=xxxfor onedb in $(mysql -h $mysqlhost -u$mysqluser -p$mysqlpassword -e "show databases;" 2>/dev/null |grep -v Database);do for onetab in $(mysql -h $mysqlhost -u$mysqluser -p$mysqlpassword $onedb -e "show tables" 2>/dev/null |grep -v 'Tables_in_');do  onetablength=$(mysql -h $mysqlhost -u$mysqluser -p$mysqlpassword $onedb -e "select count(1) from $onetab" 2>/dev/null |grep -v 'count')  echo -e "$onedb.$onetab/t$onetablength" donedone

想看哪张表的行数最多?

之前的脚本加个 |sort -nrk 2|less 搞定,超实用的小脚本就这样完成了

[root@shijiangeit ~]# for onedb in $(mysql -h $mysqlhost -u$mysqluser -p$mysqlpassword -e "show databases;" 2>/dev/null |grep -v Database);do>  for onetab in $(mysql -h $mysqlhost -u$mysqluser -p$mysqlpassword $onedb -e "show tables" 2>/dev/null |grep -v 'Tables_in_');do>   onetablength=$(mysql -h $mysqlhost -u$mysqluser -p$mysqlpassword $onedb -e "select count(1) from $onetab" 2>/dev/null |grep -v 'count')>   echo -e "$onedb.$onetab/t$onetablength">  done> done | sort -nrk 2shijiange.user 2097153information_schema.INNODB_BUFFER_PAGE  8191performance_schema.events_waits_summary_by_thread_by_event_name 5320information_schema.INNODB_BUFFER_PAGE_LRU  3453

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持武林网。

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