51.81. 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 48.

Table 51.82. 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.

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