pg_stat_replication_slots

PostgreSQL documentation ↗Source definition ↗

The pg_stat_replication_slots view will contain one row per logical replication slot, showing statistics about its usage.

First seen PG 14Last seen PG 19Columns 10

9.0 9.1 9.2 9.3 9.4 9.5 9.6 10 11 12 13 14 15 16 17 18 19^β3

Checked column by column against a PostgreSQL 18.6 instance · Raw measurement record ↗

Columns PostgreSQL 18

pg_stat_replication_slots

COLUMN	TYPE	DESCRIPTION
`slot_name`	`text`	A unique, cluster-wide identifier for the replication slot
`spill_txns`	`bigint`	Number of transactions spilled to disk once the memory used by logical decoding to decode changes from WAL has exceeded logical_decoding_work_mem. The counter gets incremented for both top-level transactions and subtransactions.
`spill_count`	`bigint`	Number of times transactions were spilled to disk while decoding changes from WAL for this slot. This counter is incremented each time a transaction is spilled, and the same transaction may be spilled multiple times.
`spill_bytes`	`bigint`	Amount of decoded transaction data spilled to disk while performing decoding of changes from WAL for this slot. This and other spill counters can be used to gauge the I/O which occurred during logical decoding and allow tuning logical_decoding_work_mem.
`stream_txns`	`bigint`	Number of in-progress transactions streamed to the decoding output plugin after the memory used by logical decoding to decode changes from WAL for this slot has exceeded logical_decoding_work_mem. Streaming only works with top-level transactions (subtransactions can't be streamed independently), so the counter is not incremented for subtransactions.
`stream_count`	`bigint`	Number of times in-progress transactions were streamed to the decoding output plugin while decoding changes from WAL for this slot. This counter is incremented each time a transaction is streamed, and the same transaction may be streamed multiple times.
`stream_bytes`	`bigint`	Amount of transaction data decoded for streaming in-progress transactions to the decoding output plugin while decoding changes from WAL for this slot. This and other streaming counters for this slot can be used to tune logical_decoding_work_mem.
`total_txns`	`bigint`	Number of decoded transactions sent to the decoding output plugin for this slot. This counts top-level transactions only, and is not incremented for subtransactions. Note that this includes the transactions that are streamed and/or spilled.
`total_bytes`	`bigint`	Amount of transaction data decoded for sending transactions to the decoding output plugin while decoding changes from WAL for this slot. Note that this includes data that is streamed and/or spilled.
`stats_reset`	`timestamp with time zone`	Time at which these statistics were last reset

Columns marked "implicit" are not included in SELECT *; some early statistics views are completed from same-version source, and the extra provenance is shown in the column description.

Column evolution matrix

Hover a cell for the column type

PresentAdded / type or attribute changeRemoved

COLUMN	9.0	9.1	9.2	9.3	9.4	9.5	9.6	10	11	12	13	14	15	16	17	18
`slot_name`	–	–	–	–	–	–	–	–	–	–	–
`spill_txns`	–	–	–	–	–	–	–	–	–	–	–
`spill_count`	–	–	–	–	–	–	–	–	–	–	–
`spill_bytes`	–	–	–	–	–	–	–	–	–	–	–
`stream_txns`	–	–	–	–	–	–	–	–	–	–	–
`stream_count`	–	–	–	–	–	–	–	–	–	–	–
`stream_bytes`	–	–	–	–	–	–	–	–	–	–	–
`total_txns`	–	–	–	–	–	–	–	–	–	–	–
`total_bytes`	–	–	–	–	–	–	–	–	–	–	–
`stats_reset`	–	–	–	–	–	–	–	–	–	–	–
`mem_exceeded_count`	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–
`slotsync_skip_count`	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–
`slotsync_last_skip`	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–

9.0 is the coverage baseline; a column already present in the baseline is not marked as added. The matrix aligns columns by name, so a rename appears as the old column removed and a new column added.

Evolution timeline

Changes between adjacent majors

PostgreSQL 19 ← 18

+ mem_exceeded_count+ slotsync_skip_count+ slotsync_last_skip

PostgreSQL 14 ← 13Catalog added

+ slot_name+ spill_txns+ spill_count+ spill_bytes+ stream_txns+ stream_count+ stream_bytes+ total_txns+ total_bytes+ stats_reset

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