On Mon, Sep 22, 2025 at 05:21:35PM +0530, shveta malik wrote:
> On Mon, Sep 22, 2025 at 4:35 PM Amit Kapila <[email protected]> wrote:
> >
> > On Mon, Sep 22, 2025 at 1:41 PM Bertrand Drouvot
> > <[email protected]> wrote:
> > >
> > > >
> > > > Since other statistics counter names are camel cases I think it's
> > > > better to follow that for the new counter.
> > >
> > > Makes sense, done with memoryLimitHits in v2 attached (that's the only
> > > change
> > > as compared with v1).
> > >
> >
> > The memory_limit_hits doesn't go well with the other names in the
> > view. Can we consider memory_exceeded_count? I find
> > memory_exceeded_count (or memory_exceeds_count) more clear and
> > matching with the existing counters. Also, how about keeping it
> > immediately after slot_name in the view? Keeping it in the end after
> > total_bytes seems out of place.
> >
>
> Since fields like spill_txns, spill_bytes, and stream_txns also talk
> about exceeding 'logical_decoding_work_mem', my preference would be to
> place this new field immediately after these spill and stream fields
> (and before total_bytes). If not this, then as Amit suggested,
> immediately before all these fields.
> Other options for name could be 'mem_limit_exceeded_count' or
> 'mem_limit_hit_count'
Thank you, Shveta and Amit, for looking at it. Since we already use txns as
abbreviation for transactions then I think it's ok to use "mem". Then I'm using
a mix of your proposals with "mem_exceeded_count" in v3 attached. Regarding the
field position, I like Shveta's proposal and did it that way.
However, technically speaking, "exceeded" is not the perfect wording since
the code was doing (and is still doing something similar to):
if (debug_logical_replication_streaming ==
DEBUG_LOGICAL_REP_STREAMING_BUFFERED &&
- rb->size < logical_decoding_work_mem * (Size) 1024)
+ !memory_limit_reached)
return;
as the comment describes correctly using "reached":
/*
* Check whether the logical_decoding_work_mem limit was reached, and if yes
* pick the largest (sub)transaction at-a-time to evict and spill its changes to
* disk or send to the output plugin until we reach under the memory limit.
So I think that "reached" or "hit" would be better wording. However, the
documentation for spill_txns, stream_txns already use "exceeded" (and not
"reached")
so I went with "exceeded" for consistency. I think that's fine, if not we may
want
to use "reached" for those 3 stats descriptions.
Regards,
--
Bertrand Drouvot
PostgreSQL Contributors Team
RDS Open Source Databases
Amazon Web Services: https://aws.amazon.com
>From eb65ef2011542d15b8575a4cc0c2afacaa64cc36 Mon Sep 17 00:00:00 2001
From: Bertrand Drouvot <[email protected]>
Date: Tue, 26 Aug 2025 13:08:13 +0000
Subject: [PATCH v3] Add mem_exceeded_count to pg_stat_replication_slots
It's currently not always possible to determine how many times the
logical_decoding_work_mem has been reached.
So adding a new counter, mem_exceeded_count to report the number of times the
logical_decoding_work_mem has been reached while decoding.
With such a counter one could get a ratio like total_txns/mem_exceeded_count.
That could help to see if reaching logical_decoding_work_mem is rare or
frequent enough. If frequent, then maybe there is a need to adjust
logical_decoding_work_mem.
XXXX: Bump catversion.
---
contrib/test_decoding/expected/stats.out | 68 +++++++++----------
contrib/test_decoding/sql/stats.sql | 10 +--
doc/src/sgml/monitoring.sgml | 11 +++
src/backend/catalog/system_views.sql | 1 +
src/backend/replication/logical/logical.c | 5 +-
.../replication/logical/reorderbuffer.c | 7 +-
src/backend/utils/activity/pgstat_replslot.c | 1 +
src/backend/utils/adt/pgstatfuncs.c | 19 +++---
src/include/catalog/pg_proc.dat | 6 +-
src/include/pgstat.h | 1 +
src/include/replication/reorderbuffer.h | 3 +
src/test/regress/expected/rules.out | 3 +-
12 files changed, 82 insertions(+), 53 deletions(-)
50.0% contrib/test_decoding/expected/
13.7% contrib/test_decoding/sql/
5.4% doc/src/sgml/
6.0% src/backend/replication/logical/
14.2% src/backend/utils/adt/
4.8% src/include/catalog/
5.4% src/
diff --git a/contrib/test_decoding/expected/stats.out b/contrib/test_decoding/expected/stats.out
index de6dc416130..0f18eea8c68 100644
--- a/contrib/test_decoding/expected/stats.out
+++ b/contrib/test_decoding/expected/stats.out
@@ -37,12 +37,12 @@ SELECT pg_stat_force_next_flush();
(1 row)
-SELECT slot_name, spill_txns = 0 AS spill_txns, spill_count = 0 AS spill_count, total_txns > 0 AS total_txns, total_bytes > 0 AS total_bytes FROM pg_stat_replication_slots ORDER BY slot_name;
- slot_name | spill_txns | spill_count | total_txns | total_bytes
-------------------------+------------+-------------+------------+-------------
- regression_slot_stats1 | t | t | t | t
- regression_slot_stats2 | t | t | t | t
- regression_slot_stats3 | t | t | t | t
+SELECT slot_name, spill_txns = 0 AS spill_txns, spill_count = 0 AS spill_count, total_txns > 0 AS total_txns, total_bytes > 0 AS total_bytes, mem_exceeded_count = 0 AS mem_exceeded_count FROM pg_stat_replication_slots ORDER BY slot_name;
+ slot_name | spill_txns | spill_count | total_txns | total_bytes | mem_exceeded_count
+------------------------+------------+-------------+------------+-------------+--------------------
+ regression_slot_stats1 | t | t | t | t | t
+ regression_slot_stats2 | t | t | t | t | t
+ regression_slot_stats3 | t | t | t | t | t
(3 rows)
RESET logical_decoding_work_mem;
@@ -53,12 +53,12 @@ SELECT pg_stat_reset_replication_slot('regression_slot_stats1');
(1 row)
-SELECT slot_name, spill_txns = 0 AS spill_txns, spill_count = 0 AS spill_count, total_txns > 0 AS total_txns, total_bytes > 0 AS total_bytes FROM pg_stat_replication_slots ORDER BY slot_name;
- slot_name | spill_txns | spill_count | total_txns | total_bytes
-------------------------+------------+-------------+------------+-------------
- regression_slot_stats1 | t | t | f | f
- regression_slot_stats2 | t | t | t | t
- regression_slot_stats3 | t | t | t | t
+SELECT slot_name, spill_txns = 0 AS spill_txns, spill_count = 0 AS spill_count, total_txns > 0 AS total_txns, total_bytes > 0 AS total_bytes, mem_exceeded_count = 0 AS mem_exceeded_count FROM pg_stat_replication_slots ORDER BY slot_name;
+ slot_name | spill_txns | spill_count | total_txns | total_bytes | mem_exceeded_count
+------------------------+------------+-------------+------------+-------------+--------------------
+ regression_slot_stats1 | t | t | f | f | t
+ regression_slot_stats2 | t | t | t | t | t
+ regression_slot_stats3 | t | t | t | t | t
(3 rows)
-- reset stats for all slots
@@ -68,27 +68,27 @@ SELECT pg_stat_reset_replication_slot(NULL);
(1 row)
-SELECT slot_name, spill_txns = 0 AS spill_txns, spill_count = 0 AS spill_count, total_txns > 0 AS total_txns, total_bytes > 0 AS total_bytes FROM pg_stat_replication_slots ORDER BY slot_name;
- slot_name | spill_txns | spill_count | total_txns | total_bytes
-------------------------+------------+-------------+------------+-------------
- regression_slot_stats1 | t | t | f | f
- regression_slot_stats2 | t | t | f | f
- regression_slot_stats3 | t | t | f | f
+SELECT slot_name, spill_txns = 0 AS spill_txns, spill_count = 0 AS spill_count, total_txns > 0 AS total_txns, total_bytes > 0 AS total_bytes, mem_exceeded_count = 0 AS mem_exceeded_count FROM pg_stat_replication_slots ORDER BY slot_name;
+ slot_name | spill_txns | spill_count | total_txns | total_bytes | mem_exceeded_count
+------------------------+------------+-------------+------------+-------------+--------------------
+ regression_slot_stats1 | t | t | f | f | t
+ regression_slot_stats2 | t | t | f | f | t
+ regression_slot_stats3 | t | t | f | f | t
(3 rows)
-- verify accessing/resetting stats for non-existent slot does something reasonable
SELECT * FROM pg_stat_get_replication_slot('do-not-exist');
- slot_name | spill_txns | spill_count | spill_bytes | stream_txns | stream_count | stream_bytes | total_txns | total_bytes | stats_reset
---------------+------------+-------------+-------------+-------------+--------------+--------------+------------+-------------+-------------
- do-not-exist | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
+ slot_name | spill_txns | spill_count | spill_bytes | stream_txns | stream_count | stream_bytes | mem_exceeded_count | total_txns | total_bytes | stats_reset
+--------------+------------+-------------+-------------+-------------+--------------+--------------+--------------------+------------+-------------+-------------
+ do-not-exist | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
(1 row)
SELECT pg_stat_reset_replication_slot('do-not-exist');
ERROR: replication slot "do-not-exist" does not exist
SELECT * FROM pg_stat_get_replication_slot('do-not-exist');
- slot_name | spill_txns | spill_count | spill_bytes | stream_txns | stream_count | stream_bytes | total_txns | total_bytes | stats_reset
---------------+------------+-------------+-------------+-------------+--------------+--------------+------------+-------------+-------------
- do-not-exist | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
+ slot_name | spill_txns | spill_count | spill_bytes | stream_txns | stream_count | stream_bytes | mem_exceeded_count | total_txns | total_bytes | stats_reset
+--------------+------------+-------------+-------------+-------------+--------------+--------------+--------------------+------------+-------------+-------------
+ do-not-exist | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
(1 row)
-- spilling the xact
@@ -110,12 +110,12 @@ SELECT pg_stat_force_next_flush();
(1 row)
-SELECT slot_name, spill_txns > 0 AS spill_txns, spill_count > 0 AS spill_count FROM pg_stat_replication_slots;
- slot_name | spill_txns | spill_count
-------------------------+------------+-------------
- regression_slot_stats1 | t | t
- regression_slot_stats2 | f | f
- regression_slot_stats3 | f | f
+SELECT slot_name, spill_txns > 0 AS spill_txns, spill_count > 0 AS spill_count, mem_exceeded_count > 0 AS mem_exceeded_count FROM pg_stat_replication_slots;
+ slot_name | spill_txns | spill_count | mem_exceeded_count
+------------------------+------------+-------------+--------------------
+ regression_slot_stats1 | t | t | t
+ regression_slot_stats2 | f | f | f
+ regression_slot_stats3 | f | f | f
(3 rows)
-- Ensure stats can be repeatedly accessed using the same stats snapshot. See
@@ -165,10 +165,10 @@ SELECT pg_stat_force_next_flush();
(1 row)
-SELECT slot_name, spill_txns, spill_count FROM pg_stat_replication_slots WHERE slot_name = 'regression_slot_stats4_twophase';
- slot_name | spill_txns | spill_count
----------------------------------+------------+-------------
- regression_slot_stats4_twophase | 0 | 0
+SELECT slot_name, spill_txns, spill_count, mem_exceeded_count FROM pg_stat_replication_slots WHERE slot_name = 'regression_slot_stats4_twophase';
+ slot_name | spill_txns | spill_count | mem_exceeded_count
+---------------------------------+------------+-------------+--------------------
+ regression_slot_stats4_twophase | 0 | 0 | 0
(1 row)
DROP TABLE stats_test;
diff --git a/contrib/test_decoding/sql/stats.sql b/contrib/test_decoding/sql/stats.sql
index a022fe1bf07..9964a8efb87 100644
--- a/contrib/test_decoding/sql/stats.sql
+++ b/contrib/test_decoding/sql/stats.sql
@@ -15,16 +15,16 @@ SELECT count(*) FROM pg_logical_slot_get_changes('regression_slot_stats1', NULL,
SELECT count(*) FROM pg_logical_slot_get_changes('regression_slot_stats2', NULL, NULL, 'skip-empty-xacts', '1');
SELECT count(*) FROM pg_logical_slot_get_changes('regression_slot_stats3', NULL, NULL, 'skip-empty-xacts', '1');
SELECT pg_stat_force_next_flush();
-SELECT slot_name, spill_txns = 0 AS spill_txns, spill_count = 0 AS spill_count, total_txns > 0 AS total_txns, total_bytes > 0 AS total_bytes FROM pg_stat_replication_slots ORDER BY slot_name;
+SELECT slot_name, spill_txns = 0 AS spill_txns, spill_count = 0 AS spill_count, total_txns > 0 AS total_txns, total_bytes > 0 AS total_bytes, mem_exceeded_count = 0 AS mem_exceeded_count FROM pg_stat_replication_slots ORDER BY slot_name;
RESET logical_decoding_work_mem;
-- reset stats for one slot, others should be unaffected
SELECT pg_stat_reset_replication_slot('regression_slot_stats1');
-SELECT slot_name, spill_txns = 0 AS spill_txns, spill_count = 0 AS spill_count, total_txns > 0 AS total_txns, total_bytes > 0 AS total_bytes FROM pg_stat_replication_slots ORDER BY slot_name;
+SELECT slot_name, spill_txns = 0 AS spill_txns, spill_count = 0 AS spill_count, total_txns > 0 AS total_txns, total_bytes > 0 AS total_bytes, mem_exceeded_count = 0 AS mem_exceeded_count FROM pg_stat_replication_slots ORDER BY slot_name;
-- reset stats for all slots
SELECT pg_stat_reset_replication_slot(NULL);
-SELECT slot_name, spill_txns = 0 AS spill_txns, spill_count = 0 AS spill_count, total_txns > 0 AS total_txns, total_bytes > 0 AS total_bytes FROM pg_stat_replication_slots ORDER BY slot_name;
+SELECT slot_name, spill_txns = 0 AS spill_txns, spill_count = 0 AS spill_count, total_txns > 0 AS total_txns, total_bytes > 0 AS total_bytes, mem_exceeded_count = 0 AS mem_exceeded_count FROM pg_stat_replication_slots ORDER BY slot_name;
-- verify accessing/resetting stats for non-existent slot does something reasonable
SELECT * FROM pg_stat_get_replication_slot('do-not-exist');
@@ -41,7 +41,7 @@ SELECT count(*) FROM pg_logical_slot_peek_changes('regression_slot_stats1', NULL
-- background transaction (say by autovacuum) happens in parallel to the main
-- transaction.
SELECT pg_stat_force_next_flush();
-SELECT slot_name, spill_txns > 0 AS spill_txns, spill_count > 0 AS spill_count FROM pg_stat_replication_slots;
+SELECT slot_name, spill_txns > 0 AS spill_txns, spill_count > 0 AS spill_count, mem_exceeded_count > 0 AS mem_exceeded_count FROM pg_stat_replication_slots;
-- Ensure stats can be repeatedly accessed using the same stats snapshot. See
-- https://postgr.es/m/20210317230447.c7uc4g3vbs4wi32i%40alap3.anarazel.de
@@ -65,7 +65,7 @@ SELECT count(*) FROM pg_logical_slot_get_changes('regression_slot_stats4_twophas
-- Verify that the decoding doesn't spill already-aborted transaction's changes.
SELECT pg_stat_force_next_flush();
-SELECT slot_name, spill_txns, spill_count FROM pg_stat_replication_slots WHERE slot_name = 'regression_slot_stats4_twophase';
+SELECT slot_name, spill_txns, spill_count, mem_exceeded_count FROM pg_stat_replication_slots WHERE slot_name = 'regression_slot_stats4_twophase';
DROP TABLE stats_test;
SELECT pg_drop_replication_slot('regression_slot_stats1'),
diff --git a/doc/src/sgml/monitoring.sgml b/doc/src/sgml/monitoring.sgml
index 3f4a27a736e..6d8060bc5f4 100644
--- a/doc/src/sgml/monitoring.sgml
+++ b/doc/src/sgml/monitoring.sgml
@@ -1620,6 +1620,17 @@ description | Waiting for a newly initialized WAL file to reach durable storage
</entry>
</row>
+ <row>
+ <entry role="catalog_table_entry"><para role="column_definition">
+ <structfield>mem_exceeded_count</structfield><type>bigint</type>
+ </para>
+ <para>
+ Number of times <literal>logical_decoding_work_mem</literal> has been
+ exceeded while decoding changes from WAL for this slot.
+ </para>
+ </entry>
+ </row>
+
<row>
<entry role="catalog_table_entry"><para role="column_definition">
<structfield>total_txns</structfield> <type>bigint</type>
diff --git a/src/backend/catalog/system_views.sql b/src/backend/catalog/system_views.sql
index c77fa0234bb..b18e7c42d17 100644
--- a/src/backend/catalog/system_views.sql
+++ b/src/backend/catalog/system_views.sql
@@ -1059,6 +1059,7 @@ CREATE VIEW pg_stat_replication_slots AS
s.stream_txns,
s.stream_count,
s.stream_bytes,
+ s.mem_exceeded_count,
s.total_txns,
s.total_bytes,
s.stats_reset
diff --git a/src/backend/replication/logical/logical.c b/src/backend/replication/logical/logical.c
index c68c0481f42..a20f0ff56e1 100644
--- a/src/backend/replication/logical/logical.c
+++ b/src/backend/replication/logical/logical.c
@@ -1958,7 +1958,7 @@ UpdateDecodingStats(LogicalDecodingContext *ctx)
if (rb->spillBytes <= 0 && rb->streamBytes <= 0 && rb->totalBytes <= 0)
return;
- elog(DEBUG2, "UpdateDecodingStats: updating stats %p %" PRId64 " %" PRId64 " %" PRId64 " %" PRId64 " %" PRId64 " %" PRId64 " %" PRId64 " %" PRId64,
+ elog(DEBUG2, "UpdateDecodingStats: updating stats %p %" PRId64 " %" PRId64 " %" PRId64 " %" PRId64 " %" PRId64 " %" PRId64 " %" PRId64 " %" PRId64 " %" PRId64,
rb,
rb->spillTxns,
rb->spillCount,
@@ -1966,6 +1966,7 @@ UpdateDecodingStats(LogicalDecodingContext *ctx)
rb->streamTxns,
rb->streamCount,
rb->streamBytes,
+ rb->memExceededCount,
rb->totalTxns,
rb->totalBytes);
@@ -1975,6 +1976,7 @@ UpdateDecodingStats(LogicalDecodingContext *ctx)
repSlotStat.stream_txns = rb->streamTxns;
repSlotStat.stream_count = rb->streamCount;
repSlotStat.stream_bytes = rb->streamBytes;
+ repSlotStat.mem_exceeded_count = rb->memExceededCount;
repSlotStat.total_txns = rb->totalTxns;
repSlotStat.total_bytes = rb->totalBytes;
@@ -1986,6 +1988,7 @@ UpdateDecodingStats(LogicalDecodingContext *ctx)
rb->streamTxns = 0;
rb->streamCount = 0;
rb->streamBytes = 0;
+ rb->memExceededCount = 0;
rb->totalTxns = 0;
rb->totalBytes = 0;
}
diff --git a/src/backend/replication/logical/reorderbuffer.c b/src/backend/replication/logical/reorderbuffer.c
index 4736f993c37..c24c2ffc8b3 100644
--- a/src/backend/replication/logical/reorderbuffer.c
+++ b/src/backend/replication/logical/reorderbuffer.c
@@ -390,6 +390,7 @@ ReorderBufferAllocate(void)
buffer->streamTxns = 0;
buffer->streamCount = 0;
buffer->streamBytes = 0;
+ buffer->memExceededCount = 0;
buffer->totalTxns = 0;
buffer->totalBytes = 0;
@@ -3898,13 +3899,17 @@ static void
ReorderBufferCheckMemoryLimit(ReorderBuffer *rb)
{
ReorderBufferTXN *txn;
+ bool memory_limit_reached = (rb->size >= logical_decoding_work_mem * (Size) 1024);
+
+ if (memory_limit_reached)
+ rb->memExceededCount += 1;
/*
* Bail out if debug_logical_replication_streaming is buffered and we
* haven't exceeded the memory limit.
*/
if (debug_logical_replication_streaming == DEBUG_LOGICAL_REP_STREAMING_BUFFERED &&
- rb->size < logical_decoding_work_mem * (Size) 1024)
+ !memory_limit_reached)
return;
/*
diff --git a/src/backend/utils/activity/pgstat_replslot.c b/src/backend/utils/activity/pgstat_replslot.c
index ccfb11c49bf..d210c261ac6 100644
--- a/src/backend/utils/activity/pgstat_replslot.c
+++ b/src/backend/utils/activity/pgstat_replslot.c
@@ -94,6 +94,7 @@ pgstat_report_replslot(ReplicationSlot *slot, const PgStat_StatReplSlotEntry *re
REPLSLOT_ACC(stream_txns);
REPLSLOT_ACC(stream_count);
REPLSLOT_ACC(stream_bytes);
+ REPLSLOT_ACC(mem_exceeded_count);
REPLSLOT_ACC(total_txns);
REPLSLOT_ACC(total_bytes);
#undef REPLSLOT_ACC
diff --git a/src/backend/utils/adt/pgstatfuncs.c b/src/backend/utils/adt/pgstatfuncs.c
index c756c2bebaa..e64dd5e043e 100644
--- a/src/backend/utils/adt/pgstatfuncs.c
+++ b/src/backend/utils/adt/pgstatfuncs.c
@@ -2100,7 +2100,7 @@ pg_stat_get_archiver(PG_FUNCTION_ARGS)
Datum
pg_stat_get_replication_slot(PG_FUNCTION_ARGS)
{
-#define PG_STAT_GET_REPLICATION_SLOT_COLS 10
+#define PG_STAT_GET_REPLICATION_SLOT_COLS 11
text *slotname_text = PG_GETARG_TEXT_P(0);
NameData slotname;
TupleDesc tupdesc;
@@ -2125,11 +2125,13 @@ pg_stat_get_replication_slot(PG_FUNCTION_ARGS)
INT8OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 7, "stream_bytes",
INT8OID, -1, 0);
- TupleDescInitEntry(tupdesc, (AttrNumber) 8, "total_txns",
+ TupleDescInitEntry(tupdesc, (AttrNumber) 8, "mem_exceeded_count",
INT8OID, -1, 0);
- TupleDescInitEntry(tupdesc, (AttrNumber) 9, "total_bytes",
+ TupleDescInitEntry(tupdesc, (AttrNumber) 9, "total_txns",
INT8OID, -1, 0);
- TupleDescInitEntry(tupdesc, (AttrNumber) 10, "stats_reset",
+ TupleDescInitEntry(tupdesc, (AttrNumber) 10, "total_bytes",
+ INT8OID, -1, 0);
+ TupleDescInitEntry(tupdesc, (AttrNumber) 11, "stats_reset",
TIMESTAMPTZOID, -1, 0);
BlessTupleDesc(tupdesc);
@@ -2152,13 +2154,14 @@ pg_stat_get_replication_slot(PG_FUNCTION_ARGS)
values[4] = Int64GetDatum(slotent->stream_txns);
values[5] = Int64GetDatum(slotent->stream_count);
values[6] = Int64GetDatum(slotent->stream_bytes);
- values[7] = Int64GetDatum(slotent->total_txns);
- values[8] = Int64GetDatum(slotent->total_bytes);
+ values[7] = Int64GetDatum(slotent->mem_exceeded_count);
+ values[8] = Int64GetDatum(slotent->total_txns);
+ values[9] = Int64GetDatum(slotent->total_bytes);
if (slotent->stat_reset_timestamp == 0)
- nulls[9] = true;
+ nulls[10] = true;
else
- values[9] = TimestampTzGetDatum(slotent->stat_reset_timestamp);
+ values[10] = TimestampTzGetDatum(slotent->stat_reset_timestamp);
/* Returns the record as Datum */
PG_RETURN_DATUM(HeapTupleGetDatum(heap_form_tuple(tupdesc, values, nulls)));
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index 01eba3b5a19..4ea72c85240 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -5687,9 +5687,9 @@
{ oid => '6169', descr => 'statistics: information about replication slot',
proname => 'pg_stat_get_replication_slot', provolatile => 's',
proparallel => 'r', prorettype => 'record', proargtypes => 'text',
- proallargtypes => '{text,text,int8,int8,int8,int8,int8,int8,int8,int8,timestamptz}',
- proargmodes => '{i,o,o,o,o,o,o,o,o,o,o}',
- proargnames => '{slot_name,slot_name,spill_txns,spill_count,spill_bytes,stream_txns,stream_count,stream_bytes,total_txns,total_bytes,stats_reset}',
+ proallargtypes => '{text,text,int8,int8,int8,int8,int8,int8,int8,int8,int8,timestamptz}',
+ proargmodes => '{i,o,o,o,o,o,o,o,o,o,o,o}',
+ proargnames => '{slot_name,slot_name,spill_txns,spill_count,spill_bytes,stream_txns,stream_count,stream_bytes,mem_exceeded_count,total_txns,total_bytes,stats_reset}',
prosrc => 'pg_stat_get_replication_slot' },
{ oid => '6230', descr => 'statistics: check if a stats object exists',
diff --git a/src/include/pgstat.h b/src/include/pgstat.h
index f402b17295c..2a38b431e8e 100644
--- a/src/include/pgstat.h
+++ b/src/include/pgstat.h
@@ -393,6 +393,7 @@ typedef struct PgStat_StatReplSlotEntry
PgStat_Counter stream_txns;
PgStat_Counter stream_count;
PgStat_Counter stream_bytes;
+ PgStat_Counter mem_exceeded_count;
PgStat_Counter total_txns;
PgStat_Counter total_bytes;
TimestampTz stat_reset_timestamp;
diff --git a/src/include/replication/reorderbuffer.h b/src/include/replication/reorderbuffer.h
index fa0745552f8..c8edbb7f0e9 100644
--- a/src/include/replication/reorderbuffer.h
+++ b/src/include/replication/reorderbuffer.h
@@ -690,6 +690,9 @@ struct ReorderBuffer
int64 streamCount; /* streaming invocation counter */
int64 streamBytes; /* amount of data decoded */
+ /* Number of times logical_decoding_work_mem has been reached */
+ int64 memExceededCount;
+
/*
* Statistics about all the transactions sent to the decoding output
* plugin
diff --git a/src/test/regress/expected/rules.out b/src/test/regress/expected/rules.out
index 35e8aad7701..f4f3a2a3018 100644
--- a/src/test/regress/expected/rules.out
+++ b/src/test/regress/expected/rules.out
@@ -2138,11 +2138,12 @@ pg_stat_replication_slots| SELECT s.slot_name,
s.stream_txns,
s.stream_count,
s.stream_bytes,
+ s.mem_exceeded_count,
s.total_txns,
s.total_bytes,
s.stats_reset
FROM pg_replication_slots r,
- LATERAL pg_stat_get_replication_slot((r.slot_name)::text) s(slot_name, spill_txns, spill_count, spill_bytes, stream_txns, stream_count, stream_bytes, total_txns, total_bytes, stats_reset)
+ LATERAL pg_stat_get_replication_slot((r.slot_name)::text) s(slot_name, spill_txns, spill_count, spill_bytes, stream_txns, stream_count, stream_bytes, mem_exceeded_count, total_txns, total_bytes, stats_reset)
WHERE (r.datoid IS NOT NULL);
pg_stat_slru| SELECT name,
blks_zeroed,
--
2.34.1
