52.80. pg_replication_slots

The pg_replication_slots view provides a listing of all replication slots that currently exist on the database cluster, along with their current state.

For more on replication slots, see Section 26.2.6 and Chapter 49.

Table 52.81. pg_replication_slots Columns

Name	Type	References	Description
slot_name	name		A unique, cluster-wide identifier for the replication slot
plugin	name		The base name of the shared object containing the output plugin this logical slot is using, or null for physical slots.
slot_type	text		The slot type - physical or logical
datoid	oid	pg_database.oid	The OID of the database this slot is associated with, or null. Only logical slots have an associated database.
database	text	pg_database.datname	The name of the database this slot is associated with, or null. Only logical slots have an associated database.
temporary	boolean		True if this is a temporary replication slot. Temporary slots are not saved to disk and are automatically dropped on error or when the session has finished.
active	boolean		True if this slot is currently actively being used
active_pid	integer		The process ID of the session using this slot if the slot is currently actively being used. NULL if inactive.
xmin	xid		The oldest transaction that this slot needs the database to retain. VACUUM cannot remove tuples deleted by any later transaction.
catalog_xmin	xid		The oldest transaction affecting the system catalogs that this slot needs the database to retain. VACUUM cannot remove catalog tuples deleted by any later transaction.
restart_lsn	pg_lsn		The address (LSN) of oldest WAL which still might be required by the consumer of this slot and thus won't be automatically removed during checkpoints. NULL if the LSN of this slot has never been reserved.
confirmed_flush_lsn	pg_lsn		The address (LSN) up to which the logical slot's consumer has confirmed receiving data. Data older than this is not available anymore. NULL for physical slots.