前言
對于開發(fā)或者運(yùn)維人員來說，Mysql數(shù)據(jù)庫每張表的數(shù)量肯定是要了解下，有助于我們清理無用數(shù)據(jù)或者了解哪張表比較占用空間。
另外多次統(tǒng)計(jì)表的行數(shù)，還能發(fā)現(xiàn)Mysql表的增量情況，能夠預(yù)測表未來會有多大的量。
廢話不多說，直接帶大家寫一個(gè)簡單的Shell小腳本
循環(huán)獲取數(shù)據(jù)庫名
直接上Shell代碼，show databases獲取所有的庫名。結(jié)果有一個(gè)我們不想要的，就是Database，這個(gè)grep -v掉，輕松獲取所有數(shù)據(jù)庫
[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 Database
information_schema
mysql
performance_schema
shijiange
test
wordpress
循環(huán)獲取所有表
有了庫信息，獲取所有表就簡單了，直接上Shell代碼。show tables獲取所有表名，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
> done
information_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 |
循環(huán)統(tǒng)計(jì)每張表的行數(shù)
取出庫名加表名，一個(gè)select count(1)統(tǒng)計(jì)表的行數(shù)，循環(huán)統(tǒng)計(jì)，直接上Shell代碼。
[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
> done
information_schema.CHARACTER_SETS 40
information_schema.COLLATIONS 219
information_schema.COLLATION_CHARACTER_SET_APPLICABILITY 219
information_schema.COLUMNS 1789
information_schema.COLUMN_PRIVILEGES 0
shijiange.logincount 4
shijiange.member 0
shijiange.user 2097153
test.detect_servers 0
wordpress.wp_commentmeta 0
wordpress.wp_comments 0
wordpress.wp_links 0
wordpress.wp_options 156
變量化，腳本直接用
需要統(tǒng)計(jì)哪個(gè)Mysql，前面三個(gè)變量一改，立馬就能統(tǒng)計(jì)所有表的大小了。
mysqlhost=127.0.0.1
mysqluser=xxx
mysqlpassword=xxx
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
想看哪張表的行數(shù)最多？
之前的腳本加個(gè) |sort -nrk 2|less 搞定，超實(shí)用的小腳本就這樣完成了
[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 2
shijiange.user 2097153
information_schema.INNODB_BUFFER_PAGE 8191
performance_schema.events_waits_summary_by_thread_by_event_name 5320
information_schema.INNODB_BUFFER_PAGE_LRU 3453
以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。
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