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Add information about WAL buffers being full to EXPLAIN (WAL)

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This is similar to ce5bcc4a9f26, relying on the addition of
wal_buffers_full to WalUsage.  This time, the information is added to
the output generated by EXPLAIN (WAL).

Author: Bertrand Drouvot
Reviewed-by: Ilia Evdokimov
Discussion: https://postgr.es/m/Z6SOha5YFFgvpwQY@ip-10-97-1-34.eu-west-3.compute.internal
This commit is contained in:
Michael Paquier 2025-02-17 14:50:33 +09:00
parent ce5bcc4a9f
commit 320545bfcf
2 changed files with 9 additions and 3 deletions
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5
doc/src/sgml/ref/explain.sgml
View File

@ -242,8 +242,9 @@ ROLLBACK;
<listitem>
<para>
Include information on WAL record generation. Specifically, include the
number of records, number of full page images (fpi) and the amount of WAL
generated in bytes. In text format, only non-zero values are printed.
number of records, number of full page images (fpi), the amount of WAL
generated in bytes and the number of times the WAL buffers became full.
In text format, only non-zero values are printed.
This parameter may only be used when <literal>ANALYZE</literal> is also
enabled. It defaults to <literal>FALSE</literal>.
</para>

7
src/backend/commands/explain.c
View File

@ -4242,7 +4242,7 @@ show_wal_usage(ExplainState *es, const WalUsage *usage)
{
/* Show only positive counter values. */
if ((usage->wal_records > 0) || (usage->wal_fpi > 0) ||
(usage->wal_bytes > 0))
(usage->wal_bytes > 0) || (usage->wal_buffers_full > 0))
{
ExplainIndentText(es);
appendStringInfoString(es->str, "WAL:");
@ -4256,6 +4256,9 @@ show_wal_usage(ExplainState *es, const WalUsage *usage)
if (usage->wal_bytes > 0)
appendStringInfo(es->str, " bytes=" UINT64_FORMAT,
usage->wal_bytes);
if (usage->wal_buffers_full > 0)
appendStringInfo(es->str, " buffers full=%lld",
(long long) usage->wal_buffers_full);
appendStringInfoChar(es->str, '\n');
}
}
@ -4267,6 +4270,8 @@ show_wal_usage(ExplainState *es, const WalUsage *usage)
usage->wal_fpi, es);
ExplainPropertyUInteger("WAL Bytes", NULL,
usage->wal_bytes, es);
ExplainPropertyInteger("WAL Buffers Full", NULL,
usage->wal_buffers_full, es);
}
}