52.83. 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 52.84. pg_replication_slots Columns

NameTypeReferencesDescription
slot_namename A unique, cluster-wide identifier for the replication slot
pluginname The base name of the shared object containing the output plugin this logical slot is using, or null for physical slots.
slot_typetext The slot type - physical or logical
datoidoidpg_database.oidThe OID of the database this slot is associated with, or null. Only logical slots have an associated database.
databasetextpg_database.datnameThe name of the database this slot is associated with, or null. Only logical slots have an associated database.
temporaryboolean 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.
activeboolean True if this slot is currently actively being used
active_pidinteger The process ID of the session using this slot if the slot is currently actively being used. NULL if inactive.
xminxid The oldest transaction that this slot needs the database to retain. VACUUM cannot remove tuples deleted by any later transaction.
catalog_xminxid 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_lsnpg_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.
confirmed_flush_lsnpg_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.