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_size desc;
2、查询单个库中所有表磁盘占用大小
select
TABLE_NAME,
concat(truncate(data_length/1024/1024,2),’ MB’) as data_size,
concat(truncate(index_length/1024/1024,2),’ MB’) as index_size
from information_schema.tables
where TABLE_SCHEMA = ‘xinyar_erp’
group by TABLE_NAME
order by data_length desc;
3、使用optimize命令
optimize table tb_report_inventory;
使用的时间比较长，需要耐心等待。
注意：optimize执行时会将表锁住，所以不要在高峰期使用。也不要经常使用，每月一次就足够了
