PostgreSQL 9.4.4 Documentation
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# 48.39. `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 25.2.6 and Chapter 46.

Table 48-39. `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
`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.

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