查询库中碎片大于1G的所有表

数据总大小：DATA_LENGTH+INDEX_LENGTH

实际表空间大小： TABLE_ROWS*AVG_ROW_LENGTH

碎片大小：（DATA_LENGTH+INDEX_LENGTH-TABLE_ROWS*AVG_ROW_LENGTH）/1024/1024/1024 碎片,单位G

整理的SQL：

select TABLE_SCHEMA,TABLE_NAME,ENGINE,concat(splinter,'G') '碎片(G)' from (

SELECT TABLE_SCHEMA,TABLE_NAME,ENGINE,ROUND((DATA_LENGTH+INDEX_LENGTH-TABLE_ROWS*AVG_ROW_LENGTH)/1024/1024/1024) splinter from information_schema.`TABLES` where TABLE_TYPE='BASE TABLE'

)a WHERE splinter >1 ORDER BY splinter DESC