Re: Cannot start the postgres service

Let me clarify bit more so I can do thing in proper manner...

I take base backup(full).

at fixed interval I need to take incremental backup and for that...

I use following commands.

psql -U postgres -c "select pg_switch_xlog()"

psql -U postgres -c "SELECT pg_stop_backup()"

after that the WAL file(s) is/are archived & I consider that file as a file
which will be used for backup along with all files exist in the pg_xlog dir.

same approach is mentioned in the
http://www.mkyong.com/database/postgresql-point-in-time-recovery-incremental-backup/

Am I doing things properly??

I know how to restore data from the full backup but havn't done anything to
restore data from the WAL files...Hopefully I will find the way...If u can
emphasize somewhere then it will be a gr8 help :)

Please correct me if I am wrong somewhere :)

Alvaro Herrera-7 wrote:
>
> Mitesh51 wrote:
>
>> I had 2 approach in my mind...to sync up transaction log files with
>> specific
>> full backup
>>
>> 1) to keep only time relavent files in pg_xlog dir and move other files
>> to
>> archive dir with code which is not a good idea as u suggest
>
> Postgres is prepared to (and assumes it can) reuse and delete files in
> pg_xlog. If you need a copy you can use for your own purposes, you MUST
> get it through an archive_command. You MUST NOT fiddle with the files
> in pg_xlog directly.
>
> Also note that your archive_command needs to create a separate copy of
> the file. Hardlinks are not allowed, because the file might get
> rewritten by Postgres later. Moving (mv) the original files is not
> allowed either for the same reason. Postgres will leave the file alone
> until it has been archived, and assumes it can do whatever it pleases
> with it as soon as the archiver has returned success (exit code 0).
>
> --
> Alvaro Herrera
> http://www.CommandPrompt.com/
> The PostgreSQL Company - Command Prompt, Inc.
>
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