1.MySQL 查看实例下，每个库的大小
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 查看具体某个库里面的某个表的大小。
select concat(round(sum(DATA_LENGTH/1024/1024),2),'M') from tables where table_schema=\"${db}\" AND table_name=\"${table}\"
3.查看mysql 实例下，所有库下的每个表的大小。
#!/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
当前标题：mysql实例下具体查看库，和表的大小
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