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 47.
Table 50-72. 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 | | The OID of the database this slot is associated with, or null. Only logical slots have an associated database. |
database | text | | The name of the database this slot is associated with, or null. Only logical slots have an associated database. |
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. | |
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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