| PostgreSQL 9.6.5 Documentation | |||
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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 | 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. |
| 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. |