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Update description of spilled counters in pg_stat_replication_slots view.

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This is to make the description of spilled counters clear.

Author: Amit Kapila
Reviewed-by: Sawada Masahiko
Discussion: https://postgr.es/m/CA+fd4k5_pPAYRTDrO2PbtTOe0eHQpBvuqmCr8ic39uTNmR49Eg@mail.gmail.com
This commit is contained in:
Amit Kapila
2020-10-27 08:22:39 +05:30
parent 2f17fe4318
commit 2f0760c9ff
1 changed files with 9 additions and 5 deletions
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14
doc/src/sgml/monitoring.sgml
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@ -2603,9 +2603,9 @@ SELECT pid, wait_event_type, wait_event FROM pg_stat_activity WHERE wait_event i
</para> </para>
<para> <para>
Number of transactions spilled to disk after the memory used by Number of transactions spilled to disk after the memory used by
logical decoding exceeds <literal>logical_decoding_work_mem</literal>. The logical decoding of changes from WAL for this slot exceeds
counter gets incremented both for toplevel transactions and <literal>logical_decoding_work_mem</literal>. The counter gets
subtransactions. incremented both for toplevel transactions and subtransactions.
</para></entry> </para></entry>
</row> </row>
@ -2614,7 +2614,8 @@ SELECT pid, wait_event_type, wait_event FROM pg_stat_activity WHERE wait_event i
<structfield>spill_count</structfield> <type>bigint</type> <structfield>spill_count</structfield> <type>bigint</type>
</para> </para>
<para> <para>
Number of times transactions were spilled to disk. Transactions Number of times transactions were spilled to disk while performing
decoding of changes from WAL for this slot. Transactions
may get spilled repeatedly, and this counter gets incremented on every may get spilled repeatedly, and this counter gets incremented on every
such invocation. such invocation.
</para></entry> </para></entry>
@ -2625,7 +2626,10 @@ SELECT pid, wait_event_type, wait_event FROM pg_stat_activity WHERE wait_event i
<structfield>spill_bytes</structfield> <type>bigint</type> <structfield>spill_bytes</structfield> <type>bigint</type>
</para> </para>
<para> <para>
Amount of decoded transaction data spilled to disk. 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 occurred during logical decoding
and accordingly can tune <literal>logical_decoding_work_mem</literal>.
</para></entry> </para></entry>
</row> </row>