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Re: WAL archiving

From: Shilpa Sudhakar <ssudhakar(at)internode(dot)com(dot)au>
To: Vishal Arora <aroravishal22(at)hotmail(dot)com>
Cc: pgsql-admin(at)postgresql(dot)org
Subject: Re: WAL archiving
Date: 2008-02-24 23:24:34
Message-ID: 47C1FCB2.3070401@internode.com.au (view raw or flat)
Thread:
Lists: pgsql-admin
Shilpa Sudhakar wrote:
> Hi Vishal,
>
> Below is the setup in the postgresql.conf file
>
> fsync = true                    # turns forced synchronization on or off
> wal_sync_method = fsync # the default varies across platforms:
> #wal_buffers = 8                # min 4, 8KB each
> #commit_delay = 0               # range 0-100000, in microseconds
> #commit_siblings = 5            # range 1-1000
>
> # - Checkpoints -
>
> checkpoint_segments = 3 # in logfile segments, min 1, 16MB each
> checkpoint_timeout = 300        # range 30-3600, in seconds
> checkpoint_warning = 30 # 0 is off, in seconds
>
> # - Archiving -
>
> archive_command = 'cp -i %p /usr/local/var/pgsql/data/wal_log/%f'
> # command to use to archive a logfile segment
>
> Since this is the test system i've put the wal_log folder in the data 
> folder itself. But, later on i'll be moving this to a different disk.
>
> We have thousands and thousands of records that get inserted and 
> updated so the wal logs would be increasing in a large rate. I was 
> thinking if i want to delete the wal logs after a period of time, do i 
> take a base backup again and then delete those old files?
>
> Thanks and Regards,
> Shilpa
>
>
> Vishal Arora wrote:
>>
>> Hi Shilpa,
>>  
>> You need not take base backup again and again. You have WAL 
>> Archiveing in place, that is enough to restore the database. BTW, 
>> what archiving command are you using for WAL Archiving in you 
>> postgresql.conf.
>>
>> - Vishal
>>
>> ------------------------------------------------------------------------
>>
>> > Date: Fri, 22 Feb 2008 09:53:25 +1030
>> > From: ssudhakar(at)internode(dot)com(dot)au
>> > To: pgsql-admin(at)postgresql(dot)org
>> > Subject: [ADMIN] WAL archiving
>> >
>> > Hi All,
>> >
>> > I am new to postgres and have been slowly learning the concepts.
>> >
>> > Regarding WAL archiving, we first take a base backup and then save all
>> > the wal logs for PITR.
>> >
>> > Both the base backup and wal logs are stored in another disk.
>> >
>> > Since the wal logs keep increasing, do we take the base backup 
>> every now
>> > and then so that we can delete the old log files?
>> > How often do we take a base filesystem backup keeping in mind that our
>> > systems are 24 x 7.
>> >
>> > Any suggestions are appreciated.
>> >
>> > Thanks and Regards,
>> > Shilpa
>> >
>> >
>> > ---------------------------(end of 
>> broadcast)---------------------------
>> > TIP 9: In versions below 8.0, the planner will ignore your desire to
>> > choose an index scan if your joining column's datatypes do not
>> > match
>>
>>
>> ------------------------------------------------------------------------
>> It's about getting married. Click here! Try it! 
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>
>


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