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
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