查询库占用的空间和索引占用的空间： 查整个库的状态： ~~~ select concat(truncate(sum(data_length)/1024/1024,2),'MB') as data_size, concat(truncate(sum(max_data_length)/1024/1024,2),'MB') as max_data_size, concat(truncate(sum(data_free)/1024/1024,2),'MB') as data_free, concat(truncate(sum(index_length)/1024/1024,2),'MB') as index_size from information_schema.tables where TABLE_SCHEMA = 'databasename'; ~~~ 查单表： ~~~ select concat(truncate(sum(data_length)/1024/1024,2),'MB') as data_size, concat(truncate(sum(max_data_length)/1024/1024,2),'MB') as max_data_size, concat(truncate(sum(data_free)/1024/1024,2),'MB') as data_free, concat(truncate(sum(index_length)/1024/1024,2),'MB') as index_size from information_schema.tables where TABLE_NAME = 'tablename'; ~~~ ~~~ SELECT SUM(DATA_FREE) FROM INFORMATION_SCHEMA.PARTITIONS WHERE TABLE_SCHEMA = 'quiknosdb_test' AND TABLE_NAME = 'ord_orders'; ~~~ 所有数据库表： `SHOW TABLE STATUS;` ~~~ https://dev.mysql.com/doc/refman/5.7/en/show-table-status.html ~~~