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doc: Correct description of restart_lsn in pg_replication_slots 

Previously the document explained that restart_lsn indicates the LSN of
oldest WAL won't be automatically removed during checkpoints. But
since v13 this was no longer true thanks to max_slot_wal_keep_size.

Back-patch to v13 where max_slot_wal_keep_size was added.

Author: Fujii Masao
Discussion: https://postgr.es/m/6497f1e9-3148-c5da-7e49-b2fddad9a42f@oss.nttdata.com
This commit is contained in:
Fujii Masao 2020-07-03 12:08:35 +09:00
parent d1763ea8c9
commit 8f9b6d4057
1 changed files with 3 additions and 1 deletions
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doc/src/sgml/catalogs.sgml
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@ -11214,7 +11214,9 @@ SELECT * FROM pg_locks pl LEFT JOIN pg_prepared_xacts ppx
<para>
The address (<literal>LSN</literal>) of oldest WAL which still
might be required by the consumer of this slot and thus won't be
automatically removed during checkpoints. <literal>NULL</literal>
automatically removed during checkpoints unless this LSN
gets behind more than <xref linkend="guc-max-slot-wal-keep-size"/>
from the current LSN. <literal>NULL</literal>
if the <literal>LSN</literal> of this slot has never been reserved.
</para></entry>
</row>