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
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.
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.
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.
Tablespaces are not deleted automatically. A tablespace must be dropped explicitly using
DROP DATABASEhas no effect in this regard, even if the operation drops all tables belonging to the tablespace.
DROP DATABASEoperation 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
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
InnoDBdata. Space is not released back to the operating system as it is for file-per-table tablespaces.
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;
This example shows how to drop an
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;