mysql查询各数据库，数据表的容量大小，使用delete删除数据之后发现data_length存在缓存问题。解决办法使用 ：TRUNCATE TABLE 表名;重新查询data_length发现数据已变化。
1.查看所有数据库容量大小
selecttable_schema as '数据库',sum(table_rows) as '记录数',
sum(truncate(data_length/1024/1024, 2)) as '数据容量(MB)',sum(truncate(index_length/1024/1024, 2)) as
'索引容量(MB)'from information_schema.tablesgroup by table_schemaorder by
sum(data_length) desc, sum(index_length) desc;
2.查看所有数据库各表容量大小
selecttable_schema as '数据库',table_name as '表名',table_rows as '记录数',truncate(data_length/1024/1024, 2) as '数据容量(MB)',truncate(index_length/1024/1024, 2) as '索引容量(MB)'from information_schema.tablesorder by data_length desc, index_length desc;
3.查看指定数据库容量大小
例：查看mysql库容量大小
selecttable_schema as '数据库',sum(table_rows) as '记录数',sum(truncate(data_length/1024/1024, 2)) as '数据容量(MB)',sum(truncate(index_length/1024/1024, 2)) as '索引容量(MB)'from information_schema.tableswhere table_schema='mysql';
4.查看指定数据库各表容量大小
例：查看mysql库各表容量大小
selecttable_schema as '数据库',table_name as '表名',table_rows as '记录数',truncate(data_length/1024/1024, 2) as '数据容量(MB)',truncate(index_length/1024/1024, 2) as '索引容量(MB)'from information_schema.tableswhere table_schema='mysql'order by data_length desc, index_length desc;Tags:
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