PostgreSQL

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.