前言

對(duì)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(cè)表未來會(huì)有多大的量。
廢話不多說，直接帶大家寫一個(gè)簡(jiǎn)單的Shell小腳本

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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(jiǎn)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