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Support multiple concurrent pg_basebackup backups.

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With this patch, pg_basebackup doesn't write a backup_label file in the
data directory, so it doesn't interfere with a pg_start/stop_backup() based
backup anymore. backup_label is still included in the backup, but it is
injected directly into the tar stream.

Heikki Linnakangas, reviewed by Fujii Masao and Magnus Hagander.
This commit is contained in:
Heikki Linnakangas
2011-01-31 18:13:01 +02:00
parent 48c9de8028
commit 997b48ed96
5 changed files with 295 additions and 113 deletions
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7
doc/src/sgml/backup.sgml
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@ -814,12 +814,13 @@ SELECT pg_stop_backup();
<para>
You can also use the <xref linkend="app-pgbasebackup"> tool to take
the backup, instead of manually copying the files. This tool will take
care of the <function>pg_start_backup()</>, copy and
the backup, instead of manually copying the files. This tool will do
the equivalent of <function>pg_start_backup()</>, copy and
<function>pg_stop_backup()</> steps automatically, and transfers the
backup over a regular <productname>PostgreSQL</productname> connection
using the replication protocol, instead of requiring filesystem level
access.
access. pg_basebackup does not interfere with filesystem level backups
taken using <function>pg_start_backup()</>/<function>pg_stop_backup()</>.
</para>
<para>

7
doc/src/sgml/ref/pg_basebackup.sgml
View File

@ -59,10 +59,9 @@ PostgreSQL documentation
</para>
<para>
Only one backup can be concurrently active in
<productname>PostgreSQL</productname>, meaning that only one instance of
<application>pg_basebackup</application> can run at the same time
against a single database cluster.
There can be multiple pg_basebackups running at the same time, but it is
better from a performance point of view to take only one backup, and copy
the the result.
</para>
</refsect1>