1CREATE SUBSCRIPTION(7)   PostgreSQL 12.6 Documentation  CREATE SUBSCRIPTION(7)
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NAME

6       CREATE_SUBSCRIPTION - define a new subscription
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SYNOPSIS

9       CREATE SUBSCRIPTION subscription_name
10           CONNECTION 'conninfo'
11           PUBLICATION publication_name [, ...]
12           [ WITH ( subscription_parameter [= value] [, ... ] ) ]
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DESCRIPTION

15       CREATE SUBSCRIPTION adds a new subscription for the current database.
16       The subscription name must be distinct from the name of any existing
17       subscription in the database.
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19       The subscription represents a replication connection to the publisher.
20       As such this command does not only add definitions in the local
21       catalogs but also creates a replication slot on the publisher.
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23       A logical replication worker will be started to replicate data for the
24       new subscription at the commit of the transaction where this command is
25       run.
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27       Additional information about subscriptions and logical replication as a
28       whole is available at Section 30.2 and Chapter 30.
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PARAMETERS

31       subscription_name
32           The name of the new subscription.
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34       CONNECTION 'conninfo'
35           The connection string to the publisher. For details see
36           Section 33.1.1.
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38       PUBLICATION publication_name
39           Names of the publications on the publisher to subscribe to.
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41       WITH ( subscription_parameter [= value] [, ... ] )
42           This clause specifies optional parameters for a subscription. The
43           following parameters are supported:
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45           copy_data (boolean)
46               Specifies whether the existing data in the publications that
47               are being subscribed to should be copied once the replication
48               starts. The default is true.
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50           create_slot (boolean)
51               Specifies whether the command should create the replication
52               slot on the publisher. The default is true.
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54           enabled (boolean)
55               Specifies whether the subscription should be actively
56               replicating, or whether it should be just setup but not started
57               yet. The default is true.
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59           slot_name (string)
60               Name of the replication slot to use. The default behavior is to
61               use the name of the subscription for the slot name.
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63               When slot_name is set to NONE, there will be no replication
64               slot associated with the subscription. This can be used if the
65               replication slot will be created later manually. Such
66               subscriptions must also have both enabled and create_slot set
67               to false.
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69           synchronous_commit (enum)
70               The value of this parameter overrides the synchronous_commit
71               setting. The default value is off.
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73               It is safe to use off for logical replication: If the
74               subscriber loses transactions because of missing
75               synchronization, the data will be sent again from the
76               publisher.
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78               A different setting might be appropriate when doing synchronous
79               logical replication. The logical replication workers report the
80               positions of writes and flushes to the publisher, and when
81               using synchronous replication, the publisher will wait for the
82               actual flush. This means that setting synchronous_commit for
83               the subscriber to off when the subscription is used for
84               synchronous replication might increase the latency for COMMIT
85               on the publisher. In this scenario, it can be advantageous to
86               set synchronous_commit to local or higher.
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88           connect (boolean)
89               Specifies whether the CREATE SUBSCRIPTION should connect to the
90               publisher at all. Setting this to false will change default
91               values of enabled, create_slot and copy_data to false.
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93               It is not allowed to combine connect set to false and enabled,
94               create_slot, or copy_data set to true.
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96               Since no connection is made when this option is set to false,
97               the tables are not subscribed, and so after you enable the
98               subscription nothing will be replicated. It is required to run
99               ALTER SUBSCRIPTION ... REFRESH PUBLICATION in order for tables
100               to be subscribed.
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NOTES

104       See Section 30.7 for details on how to configure access control between
105       the subscription and the publication instance.
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107       When creating a replication slot (the default behavior), CREATE
108       SUBSCRIPTION cannot be executed inside a transaction block.
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110       Creating a subscription that connects to the same database cluster (for
111       example, to replicate between databases in the same cluster or to
112       replicate within the same database) will only succeed if the
113       replication slot is not created as part of the same command. Otherwise,
114       the CREATE SUBSCRIPTION call will hang. To make this work, create the
115       replication slot separately (using the function
116       pg_create_logical_replication_slot with the plugin name pgoutput) and
117       create the subscription using the parameter create_slot = false. This
118       is an implementation restriction that might be lifted in a future
119       release.
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EXAMPLES

122       Create a subscription to a remote server that replicates tables in the
123       publications mypublication and insert_only and starts replicating
124       immediately on commit:
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126           CREATE SUBSCRIPTION mysub
127                    CONNECTION 'host=192.168.1.50 port=5432 user=foo dbname=foodb'
128                   PUBLICATION mypublication, insert_only;
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130       Create a subscription to a remote server that replicates tables in the
131       insert_only publication and does not start replicating until enabled at
132       a later time.
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134           CREATE SUBSCRIPTION mysub
135                    CONNECTION 'host=192.168.1.50 port=5432 user=foo dbname=foodb'
136                   PUBLICATION insert_only
137                          WITH (enabled = false);
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COMPATIBILITY

140       CREATE SUBSCRIPTION is a PostgreSQL extension.
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SEE ALSO

143       ALTER SUBSCRIPTION (ALTER_SUBSCRIPTION(7)), DROP SUBSCRIPTION
144       (DROP_SUBSCRIPTION(7)), CREATE PUBLICATION (CREATE_PUBLICATION(7)),
145       ALTER PUBLICATION (ALTER_PUBLICATION(7))
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149PostgreSQL 12.6                      2021               CREATE SUBSCRIPTION(7)
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