13.1.30 DROP TABLESPACE Statement

DROP TABLESPACE tablespace_name
    [ENGINE [=] engine_name]

This statement drops a tablespace that was previously created using CREATE TABLESPACE. It is supported with all MySQL NDB Cluster 7.5 releases, and with InnoDB in the standard MySQL Server as well.

ENGINE sets the storage engine that uses the tablespace, where engine_name is the name of the storage engine. Currently, the values InnoDB and NDB are supported. If not set, the value of default_storage_engine is used. If it is not the same as the storage engine used to create the tablespace, the DROP TABLESPACE statement fails.

For an InnoDB tablespace, all tables must be dropped from the tablespace prior to a DROP TABLESPACE operation. If the tablespace is not empty, DROP TABLESPACE returns an error.

As with the InnoDB system tablespace, truncating or dropping InnoDB tables stored in a general tablespace creates free space in the tablespace .ibd data file, which can only be used for new InnoDB data. Space is not released back to the operating system by such operations as it is for file-per-table tablespaces.

An NDB tablespace to be dropped must not contain any data files; in other words, before you can drop an NDB tablespace, you must first drop each of its data files using ALTER TABLESPACE ... DROP DATAFILE.

Notes

• Tablespaces are not deleted automatically. A tablespace must be dropped explicitly using DROP TABLESPACE. DROP DATABASE has no effect in this regard, even if the operation drops all tables belonging to the tablespace.

• A DROP DATABASE operation can drop tables that belong to a general tablespace but it cannot drop the tablespace, even if the operation drops all tables that belong to the tablespace. The tablespace must be dropped explicitly using DROP TABLESPACE tablespace_name.

• Similar to the system tablespace, truncating or dropping tables stored in a general tablespace creates free space internally in the general tablespace .ibd data file which can only be used for new InnoDB data. Space is not released back to the operating system as it is for file-per-table tablespaces.

InnoDB Example

This example demonstrates how to drop an InnoDB general tablespace. The general tablespace ts1 is created with a single table. Before dropping the tablespace, the table must be dropped.

mysql> CREATE TABLESPACE `ts1` ADD DATAFILE 'ts1.ibd' Engine=InnoDB;

mysql> CREATE TABLE t1 (c1 INT PRIMARY KEY) TABLESPACE ts1 Engine=InnoDB;

mysql> DROP TABLE t1;

mysql> DROP TABLESPACE ts1;

NDB Example

This example shows how to drop an NDB tablespace myts having a data file named mydata-1.dat after first creating the tablespace, and assumes the existence of a log file group named mylg (see Section 13.1.15, “CREATE LOGFILE GROUP Statement”).

mysql> CREATE TABLESPACE myts
    ->     ADD DATAFILE 'mydata-1.dat'
    ->     USE LOGFILE GROUP mylg
    ->     ENGINE=NDB;

You must remove all data files from the tablespace using ALTER TABLESPACE, as shown here, before it can be dropped:

mysql> ALTER TABLESPACE myts
    ->     DROP DATAFILE 'mydata-1.dat'
    ->     ENGINE=NDB;

mysql> DROP TABLESPACE myts;