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Revision 13292

Added by Aaron Marcuse-Kubitza over 10 years ago

fix: web/links/index.htm: updated to Firefox bookmarks: PostgreSQL: backups: wal_keep_segments: restored annotations

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index.htm
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<DD>&quot;To prepare for low level standalone hot backups, set wal_level to archive (or hot_standby), archive_mode to on, and set up an archive_command that performs archiving only when a switch file exists.&quot;
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to work with a filesystem-level backup, you need a WAL chain that&#39;s at least long enough (time-wise) for the WAL blocks created when it starts copying base/ to still be around when it finishes copying pg_xlog/ (it must also copy in alphabetical order, and not in parallel).


  		




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                                <DT><A HREF="http://www.postgresql.org/docs/9.3/static/runtime-config-replication.html#GUC-WAL-KEEP-SEGMENTS" name="http://www.postgresql.org/docs/9.3/static/runtime-config-replication.html#GUC-WAL-KEEP-SEGMENTS" ADD_DATE="1398196461" ICON_URI="http://www.postgresql.org/favicon.ico" LAST_CHARSET="UTF-8"><img width="16" height="16" src="http://www.postgresql.org/favicon.ico" style="margin-right: 0.5em;"/>*** PostgreSQL: Documentation: 9.3: Replication: wal_keep_segments</A><a name="*** PostgreSQL: Documentation: 9.3: Replication: wal_keep_segments" href="#*** PostgreSQL: Documentation: 9.3: Replication: wal_keep_segments" style="margin-left: 0.5em;">&para;</a>


  		




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<DD>page's self-description: online backups:


  		




  
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                                <DT><A HREF="http://www.postgresql.org/docs/9.3/static/runtime-config-replication.html#GUC-WAL-KEEP-SEGMENTS" name="http://www.postgresql.org/docs/9.3/static/runtime-config-replication.html#GUC-WAL-KEEP-SEGMENTS" ADD_DATE="1398234626" ICON_URI="http://www.postgresql.org/favicon.ico" LAST_CHARSET="UTF-8"><img width="16" height="16" src="http://www.postgresql.org/favicon.ico" style="margin-right: 0.5em;"/>*** PostgreSQL: Documentation: 9.3: Replication: wal_keep_segments</A><a name="*** PostgreSQL: Documentation: 9.3: Replication: wal_keep_segments" href="#*** PostgreSQL: Documentation: 9.3: Replication: wal_keep_segments" style="margin-left: 0.5em;">&para;</a>


  		




  
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<DD>&quot;wal_keep_segments (integer)


  		




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pg_start_backup() method:


  		




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(more reliable, but requires putting the DB server into a special mode during backup)


  		




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# configure:


  		




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## in postgresql.conf, set wal_level = hot_standby


  		




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## $ sudo service postgresql restart


  		




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# run:


  		




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## $ sudo -u postgres psql &lt;&lt;&lt;&quot;SELECT pg_start_backup(&#39;backup&#39;, true);&quot;


  		




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## copy files using rsync, etc.


  		




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## $ sudo -u postgres psql &lt;&lt;&lt;&quot;SELECT pg_stop_backup();&quot;


  		




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wal_keep_segments method:


  		




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(less reliable, but the backup is completely independent of the DB server)


  		




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# configure:


  		




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## in postgresql.conf:


  		




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### set wal_level = hot_standby


  		




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### set wal_keep_segments to long enough that the WAL chain spans the duration of the backup


  		




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#### to determine this, measure how quickly WAL segments are created at peak DB usage


  		




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## $ sudo service postgresql restart


  		




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# run:


  		




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## copy files using rsync, etc.


  		




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## copy again to get changes since last backup


  		




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## copy again to make sure there are no more changes


  		




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offline backups:


  		




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# copy files using rsync, etc.


  		




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# copy again to get changes since last backup


  		




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# $ sudo service postgresql stop


  		




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# copy again to make the copy a consistent snapshot


  		




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# $ sudo service postgresql start


  		




  
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    Specifies the minimum number of past log file segments kept in the pg_xlog directory&quot;


  		




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                                <DT><A HREF="http://michael.otacoo.com/postgresql-2/postgres-9-3-feature-highlight-parallel-pg_dump/" name="http://michael.otacoo.com/postgresql-2/postgres-9-3-feature-highlight-parallel-pg_dump/" ADD_DATE="1397769449" ICON_URI="http://michael.otacoo.com/content/favicon_otacoo.gif" LAST_CHARSET="UTF-8"><img width="16" height="16" src="http://michael.otacoo.com/content/favicon_otacoo.gif" style="margin-right: 0.5em;"/>Postgres 9.3 feature highlight: parallel pg_dump</A><a name="Postgres 9.3 feature highlight: parallel pg_dump" href="#Postgres 9.3 feature highlight: parallel pg_dump" style="margin-left: 0.5em;">&para;</a>


  		




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<DD>page's self-description: Postgres 9.3 feature highlight: parallel pg_dump


  		




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                                <DT><A HREF="http://www.postgresql.org/docs/9.3/static/sql-checkpoint.html" name="http://www.postgresql.org/docs/9.3/static/sql-checkpoint.html" ADD_DATE="1398205258" ICON_URI="http://www.postgresql.org/favicon.ico" LAST_CHARSET="UTF-8"><img width="16" height="16" src="http://www.postgresql.org/favicon.ico" style="margin-right: 0.5em;"/>PostgreSQL: Documentation: 9.3: CHECKPOINT</A><a name="PostgreSQL: Documentation: 9.3: CHECKPOINT" href="#PostgreSQL: Documentation: 9.3: CHECKPOINT" style="margin-left: 0.5em;">&para;</a>


  		












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