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| -rw-r--r-- | doc/src/sgml/ref/pg_receivewal.sgml | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/doc/src/sgml/ref/pg_receivewal.sgml b/doc/src/sgml/ref/pg_receivewal.sgml index 45b544cf498..6da8b2be8c0 100644 --- a/doc/src/sgml/ref/pg_receivewal.sgml +++ b/doc/src/sgml/ref/pg_receivewal.sgml @@ -76,6 +76,29 @@ PostgreSQL documentation </para> <para> + The starting point of the write-ahead log streaming is calculated when + <application>pg_receivewal</application> starts: + <orderedlist> + <listitem> + <para> + First, scan the directory where the WAL segment files are written and + find the newest completed segment file, using as starting point the + beginning of the next WAL segment file. This is calculated independently + on the compression method used to compress each segment. + </para> + </listitem> + + <listitem> + <para> + If a starting point cannot be calculated with the previous method, + the latest WAL flush location is used as reported by the server from + a <literal>IDENTIFY_SYSTEM</literal> command. + </para> + </listitem> + </orderedlist> + </para> + + <para> If the connection is lost, or if it cannot be initially established, with a non-fatal error, <application>pg_receivewal</application> will retry the connection indefinitely, and reestablish streaming as soon |