如何查看MySQL单个数据库或者表的大小
很多时候，比如在做数据备份或者表的online alter的时候，需要知道Database 或者Table 数据量的大小来判断预计的时间或者所需缓存的大小。这些信息可以从information_schema数据库的TABLES表中获得。
总体来说，这些信息存在于information_schema数据库的TABLES表中
mysql> desc information_schema.TABLES; +-----------------+---------------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-----------------+---------------------+------+-----+---------+-------+ | TABLE_CATALOG | varchar(512) | NO | | | | | TABLE_SCHEMA | varchar(64) | NO | | | | | TABLE_NAME | varchar(64) | NO | | | | | TABLE_TYPE | varchar(64) | NO | | | | | ENGINE | varchar(64) | YES | | NULL | | | VERSION | bigint(21) unsigned | YES | | NULL | | | ROW_FORMAT | varchar(10) | YES | | NULL | | | TABLE_ROWS | bigint(21) unsigned | YES | | NULL | | | AVG_ROW_LENGTH | bigint(21) unsigned | YES | | NULL | | | DATA_LENGTH | bigint(21) unsigned | YES | | NULL | | | MAX_DATA_LENGTH | bigint(21) unsigned | YES | | NULL | | | INDEX_LENGTH | bigint(21) unsigned | YES | | NULL | | | DATA_FREE | bigint(21) unsigned | YES | | NULL | | | AUTO_INCREMENT | bigint(21) unsigned | YES | | NULL | | | CREATE_TIME | datetime | YES | | NULL | | | UPDATE_TIME | datetime | YES | | NULL | | | CHECK_TIME | datetime | YES | | NULL | | | TABLE_COLLATION | varchar(32) | YES | | NULL | | | CHECKSUM | bigint(21) unsigned | YES | | NULL | | | CREATE_OPTIONS | varchar(255) | YES | | NULL | | | TABLE_COMMENT | varchar(2048) | NO | | | | +-----------------+---------------------+------+-----+---------+-------+
# check database size
SELECT table_schema “DB Name”, Round(Sum(data_length + index_length) / 1024 / 1024 / 1024, 1) “DB Size in GB” FROM information_schema.tables GROUP BY table_schema;
# check table size
SELECT table_schema as `Database`, table_name AS `Table`, round(((data_length + index_length) / 1024 / 1024 / 1024), 2) `Size in GB` FROM information_schema.TABLES where table_schema = \’purge_qms\’ ORDER BY (data_length + index_length) DESC ;
版权声明：本文为shitouer原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。