DROP SUBSCRIPTION
DROP SUBSCRIPTION
DROP SUBSCRIPTION - remove a subscription
Synopsis
DROP SUBSCRIPTION [ IF EXISTS ] name [ CASCADE | RESTRICT ]
Description
DROP SUBSCRIPTION
removes a subscription from the
database cluster.
A subscription can only be dropped by a superuser.
DROP SUBSCRIPTION
cannot be executed inside a
transaction block if the subscription is associated with a replication
slot. (You can use
ALTER SUBSCRIPTION
to unset the
slot.)
Parameters
-
name -
The name of a subscription to be dropped.
-
CASCADE
RESTRICT -
These key words do not have any effect, since there are no dependencies on subscriptions.
Notes
When dropping a subscription that is associated with a replication slot on
the remote host (the normal state),
DROP SUBSCRIPTION
will connect to the remote host and try to drop the replication slot (and
any remaining table synchronization slots) as
part of its operation. This is necessary so that the resources allocated
for the subscription on the remote host are released. If this fails,
either because the remote host is not reachable or because the remote
replication slot cannot be dropped or does not exist or never existed,
the
DROP SUBSCRIPTION
command will fail. To proceed
in this situation, first disable the subscription by executing
ALTER SUBSCRIPTION ... DISABLE
, and then disassociate
it from the replication slot by executing
ALTER SUBSCRIPTION ... SET (slot_name = NONE)
.
After that,
DROP SUBSCRIPTION
will no longer attempt any
actions on a remote host. Note that if the remote replication slot still
exists, it (and any related table synchronization slots) should then be
dropped manually; otherwise it/they will continue to
reserve WAL and might eventually cause the disk to fill up. See
also
Section 31.2.1
.
If a subscription is associated with a replication slot, then
DROP
SUBSCRIPTION
cannot be executed inside a transaction block.
Examples
Drop a subscription:
DROP SUBSCRIPTION mysub;
Compatibility
DROP SUBSCRIPTION
is a
PostgreSQL
extension.