Re: Help with PITR WAL Restore and configuration. - Mailing list pgsql-admin
| From | Jason Mathis |
|---|---|
| Subject | Re: Help with PITR WAL Restore and configuration. |
| Date | |
| Msg-id | etPan.53dfc4b9.66334873.137@palos Whole thread Raw |
| In response to | Re: Help with PITR WAL Restore and configuration. (Scott Whitney <scott@journyx.com>) |
| Responses |
Re: Help with PITR WAL Restore and configuration.
|
| List | pgsql-admin |
You may want to look at the “-x” option for the older backups.
"Includes the required transaction log files (WAL files) in the backup. This will include all transaction logs generated during the backup. If this option is specified, it is possible to start a postmaster directly in the extracted directory without the need to consult the log archive, thus making this a completely standalone backup."
Otherwise you need those wal segments to perform a restore.
-jason
On August 4, 2014 at 11:18:40 AM, Scott Whitney (scott@journyx.com) wrote:
Let's say that you began this in January. According to your retention plan, you will have:
Base Backups:
--------------
Jan 31, 2014
Feb 28, 2014
Mar 31, 2014
Apr 30, 2014
May 31, 2014
Jun 30, 2014
July 31, 2014
WAL Logs:
Daily WAL logs since Jun 5, 2014
If my understanding is correct, none of your base backups prior to Jun 5, 2014 will be useful for recovering any PITR other than the specific time _of_ the base backup. You cannot replay later WALs on the March backup, for example, as you are missing all of the WAL segments between Mar 31, 2014 and Jun 5, 2014.
So, if I am reading this correctly, the only points which you could recover are:
Jan 31, 2014
Feb 28, 2014
Mar 31, 2014
Apr 30, 2014
May 31, 2014
Jun 30, 2014 + any point in time to your latest WAL backups.
There would be a gap between May 31st and June 5th which would not allow PITR.
In regards to retention we are planning on this.Hi All,We are moving to a new backup solution where we will backup direct to the backup server using a Daily Base backup with pg_start_backup and WAL Log backups every 4 hours.WAL Logs
Daily 4 to 6 times: 60 days retention.
Base BackupDaily: Mon-Thursday 7 Day RetentionWeekly: Friday 31 Day RetentionMonthly: Last Day of month: 365 Day RetentionSo what I am looking for is some clarification on the Base Backups that are 6 months old for example.Since my WAL Log backups have a 2 month retention I can do PITR from any Base Backup + WAL Logs any day from 2 months back.However let's say for example I want to restore the Base Backup from 6 months ago, I only have the Base Backups.. Will I be able to recover to that point in time using that Base backup? I have read the PITR documentation however I still struggle to understand this part of it.ThanksJimmy
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