/* 数据库总存储空间 */
select sum(data_length+index_length) size from information_schema.tables;
/* 不同数据库的存储空间 */
select table_schema,sum(data_length+index_length) size from information_schema.tables group by table_schema order by size desc;
/* 指定库下不同表的存储空间 */
select table_name,sum(data_length+index_length) size from information_schema.tables where table_schema='test' group by table_name order by size desc;
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