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Document that receive location can rewind if replication restarts.

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Fujii Masao, with some further wordsmithing by me.
This commit is contained in:
Robert Haas 2010-06-17 01:32:09 +00:00
parent 147c665d01
commit 5c5184c043
1 changed files with 8 additions and 5 deletions
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13
doc/src/sgml/func.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.518 2010/06/10 07:00:25 heikki Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.519 2010/06/17 01:32:09 rhaas Exp $ -->
<chapter id="functions">
<title>Functions and Operators</title>
@ -13282,10 +13282,13 @@ postgres=# SELECT * FROM pg_xlogfile_name_offset(pg_stop_backup());
<entry><type>text</type></entry>
<entry>Get last transaction log location received and synced to disk by
streaming replication. While streaming replication is in progress
this will increase monotonically. If recovevery has completed
this will remain static at the value of the last WAL record
received and synced to disk during recovery. If streaming replication
is disabled, or it has not yet started, the function returns NULL.
this will increase monotonically. But when streaming replication is
restarted this will back off to the replication starting position,
typically the beginning of the WAL file containing the current
replay location. If recovery has completed this will remain static at
the value of the last WAL record received and synced to disk during
recovery. If streaming replication is disabled, or if it has not yet
started, the function returns NULL.
</entry>
</row>
<row>