1.mysql 查看實例下，每個庫的大小

select TABLE_SCHEMA, concat(truncate(sum(data_length)/1024/1024,2),‘ MB‘) as data_size,
concat(truncate(sum(index_length)/1024/1024,2),‘MB‘) as index_size
from information_schema.tables
group by TABLE_SCHEMA
order by data_length desc;


2.mysql 查看具體某個庫裏面的某個表的大小。
select concat(round(sum(DATA_LENGTH/1024/1024),2),‘M‘) from tables where table_schema=\"${db}\" AND table_name=\"${table}\"




3.查看mysql 實例下，所有庫下的每個表的大小。
#!/bin/bash
>allsize.txt
for n in `cat mysqlbackuplist.txt`
do

        echo ========= ${n} =========  >>allsize.txt
    for db in `mysql -uroot -ppassword -h$n -e ‘show databases;‘ |awk  ‘NR>1{print $1}‘|egrep -v ‘schema|tmp|sys|innodb|mysql|tigasedb‘`
    do
        >${db}size.txt
        echo ========= ${db} =========
        echo ========= ${db} ========= >>allsize.txt
        for table in `mysql -uroot -ppassword -h$n -e "use ${db}; show tables"`
        do
            selectsql="select concat(round(sum(DATA_LENGTH/1024/1024),2),‘M‘) from tables where table_schema=\"${db}\" AND table_name=\"${table}\";"
            mysql -uroot -ppassword -h$n -e "use information_schema; $selectsql" |awk -v table=$table ‘NR>1{print table "  " $1}‘  >>${db}size.txt
            
        done
        cat ${db}size.txt|sort -k 2 -rn >> allsize.txt
    done 

done

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mysql 實例下具體查看庫，和表的大小