Attach a tablespace to a hypertable and use it to store chunks. A [tablespace][postgres-tablespaces] is a directory on the filesystem that allows control over where individual tables and indexes are stored on the filesystem. A common use case is to create a tablespace for a particular storage disk, allowing tables to be stored there. Please review the standard PostgreSQL documentation for more [information on tablespaces][postgres-tablespaces].

TimescaleDB can manage a set of tablespaces for each hypertable, automatically spreading chunks across the set of tablespaces attached to a hypertable. If a hypertable is hash partitioned, TimescaleDB will try to place chunks that belong to the same partition in the same tablespace. Changing the set of tablespaces attached to a hypertable may also change the placement behavior. A hypertable with no attached tablespaces will have its chunks placed in the database's default tablespace.

Required Arguments

tablespaceTEXTName of the tablespace to attach.
hypertableREGCLASSHypertable to attach the tablespace to.

Tablespaces need to be [created][postgres-createtablespace] before being attached to a hypertable. Once created, tablespaces can be attached to multiple hypertables simultaneously to share the underlying disk storage. Associating a regular table with a tablespace using the TABLESPACE option to CREATE TABLE, prior to calling create_hypertable, will have the same effect as calling attach_tablespace immediately following create_hypertable.

Optional Arguments

if_not_attachedBOOLEANSet to true to avoid throwing an error if the tablespace is already attached to the table. A notice is issued instead. Defaults to false.

Sample Usage

Attach the tablespace disk1 to the hypertable conditions:

SELECT attach_tablespace('disk1', 'conditions');
SELECT attach_tablespace('disk2', 'conditions', if_not_attached => true);

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