Postgres Pro Enterprise : Documentation: 16: ALTER SUBSCRIPTION : Postgres Professional

ALTER SUBSCRIPTION
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ALTER SUBSCRIPTION

ALTER SUBSCRIPTION — change the definition of a subscription

Synopsis

ALTER SUBSCRIPTION name CONNECTION 'conninfo'
ALTER SUBSCRIPTION name SET PUBLICATION publication_name [, ...] [ WITH ( publication_option [= value] [, ... ] ) ]
ALTER SUBSCRIPTION name ADD PUBLICATION publication_name [, ...] [ WITH ( publication_option [= value] [, ... ] ) ]
ALTER SUBSCRIPTION name DROP PUBLICATION publication_name [, ...] [ WITH ( publication_option [= value] [, ... ] ) ]
ALTER SUBSCRIPTION name REFRESH PUBLICATION [ WITH ( refresh_option [= value] [, ... ] ) ]
ALTER SUBSCRIPTION name ENABLE
ALTER SUBSCRIPTION name DISABLE
ALTER SUBSCRIPTION name SET ( subscription_parameter [= value] [, ... ] )
ALTER SUBSCRIPTION name SKIP ( skip_option = value )
ALTER SUBSCRIPTION name OWNER TO { new_owner | CURRENT_ROLE | CURRENT_USER | SESSION_USER }
ALTER SUBSCRIPTION name RENAME TO new_name

Description

ALTER SUBSCRIPTION can change most of the subscription properties that can be specified in CREATE SUBSCRIPTION.

You must own the subscription to use ALTER SUBSCRIPTION. To rename a subscription or alter the owner, you must have CREATE permission on the database. In addition, to alter the owner, you must be able to SET ROLE to the new owning role. If the subscription has password_required=false, only superusers can modify it.

When refreshing a publication we remove the relations that are no longer part of the publication and we also remove the table synchronization slots if there are any. It is necessary to remove these slots so that the resources allocated for the subscription on the remote host are released. If due to network breakdown or some other error, Postgres Pro is unable to remove the slots, an error will be reported. To proceed in this situation, the user either needs to retry the operation or disassociate the slot from the subscription and drop the subscription as explained in DROP SUBSCRIPTION.

Commands ALTER SUBSCRIPTION ... REFRESH PUBLICATION and ALTER SUBSCRIPTION ... {SET|ADD|DROP} PUBLICATION ... with refresh option as true cannot be executed inside a transaction block. These commands also cannot be executed when the subscription has two_phase commit enabled, unless copy_data is false. See column subtwophasestate of pg_subscription to know the actual two-phase state.

Parameters

name

The name of a subscription whose properties are to be altered.

CONNECTION 'conninfo'

This clause replaces the connection string originally set by CREATE SUBSCRIPTION. See there for more information.

SET PUBLICATION publication_name ADD PUBLICATION publication_name DROP PUBLICATION publication_name

These forms change the list of subscribed publications. SET replaces the entire list of publications with a new list, ADD adds additional publications to the list of publications, and DROP removes the publications from the list of publications. We allow non-existent publications to be specified in ADD and SET variants so that users can add those later. See CREATE SUBSCRIPTION for more information. By default, this command will also act like REFRESH PUBLICATION.

publication_option specifies additional options for this operation. The supported options are:

refresh (boolean): When false, the command will not try to refresh table information. REFRESH PUBLICATION should then be executed separately. The default is true.

Additionally, the options described under REFRESH PUBLICATION may be specified, to control the implicit refresh operation.

REFRESH PUBLICATION

Fetch missing table information from publisher. This will start replication of tables that were added to the subscribed-to publications since CREATE SUBSCRIPTION or the last invocation of REFRESH PUBLICATION.

refresh_option specifies additional options for the refresh operation. The supported options are:

copy_data (boolean)

Specifies whether to copy pre-existing data in the publications that are being subscribed to when the replication starts. The default is true.

Previously subscribed tables are not copied, even if a table's row filter WHERE clause has since been modified.

See Notes for details of how copy_data = true can interact with the origin parameter.

See the binary parameter of CREATE SUBSCRIPTION for details about copying pre-existing data in binary format.

ENABLE

Enables a previously disabled subscription, starting the logical replication worker at the end of the transaction.

DISABLE

Disables a running subscription, stopping the logical replication worker at the end of the transaction.

SET ( subscription_parameter [= value] [, ... ] )

This clause alters parameters originally set by CREATE SUBSCRIPTION. See there for more information. The parameters that can be altered are slot_name, synchronous_commit, binary, streaming, disable_on_error, password_required, run_as_owner, and origin. Only a superuser can set password_required = false.

SKIP ( skip_option = value )

Skips applying all changes of the remote transaction. If incoming data violates any constraints, logical replication will stop until it is resolved. By using the ALTER SUBSCRIPTION ... SKIP command, the logical replication worker skips all data modification changes within the transaction. This option has no effect on the transactions that are already prepared by enabling two_phase on the subscriber. After the logical replication worker successfully skips the transaction or finishes a transaction, the LSN (stored in pg_subscription.subskiplsn) is cleared. See Section 30.5 for the details of logical replication conflicts.

skip_option specifies options for this operation. The supported option is:

lsn (pg_lsn): Specifies the finish LSN of the remote transaction whose changes are to be skipped by the logical replication worker. The finish LSN is the LSN at which the transaction is either committed or prepared. Skipping individual subtransactions is not supported. Setting NONE resets the LSN.

new_owner

The user name of the new owner of the subscription.

new_name

The new name for the subscription.

When specifying a parameter of type boolean, the = value part can be omitted, which is equivalent to specifying TRUE.

Examples

Change the publication subscribed by a subscription to insert_only:

ALTER SUBSCRIPTION mysub SET PUBLICATION insert_only;

Disable (stop) the subscription:

ALTER SUBSCRIPTION mysub DISABLE;

Compatibility

ALTER SUBSCRIPTION is a Postgres Pro extension.