Re: Help estimating database and WAL size - Mailing list pgsql-general

John R Pierce wrote:
> On 10/08/12 1:39 PM, Daniel Serodio (lists) wrote:
>> 3) Estimate the size of the transaction log
>>     ** We've got no idea how to estimate this, need advice **
>
> postgres doesn't have a 'transaction log', it has the WAL (Write-Ahead
> Logs).  These are typically 16MB each.  on databases with a really
> heavy write load, I might bump the checkpoint_segments as high as 60,
> which seems to result in about 120 of them being created, 2GB total.
> these files get reused, unless you are archiving them to implement a
> continuous realtime backup system (which enables "PITR", Point in Time
> Recovery)
Thanks, I was using the term "transaction log" as a synonym for WAL.
We're planning on enabling PITR; how can we calculate the WAL size and
the WAL archive size in this case?

Regards,
Daniel Serodio