Re: [WIP] Performance Improvement by reducing WAL for Update Operation

From: Heikki Linnakangas [mailto:heikki(dot)linnakangas(at)enterprisedb(dot)com]
Sent: Monday, August 27, 2012 5:58 PM
To: Amit kapila
On 27.08.2012 15:18, Amit kapila wrote:
>>> I have implemented the WAL Reduction Patch for the case of HOT Update as
pointed out by Simon and Robert. In this patch it only goes for Optimized
WAL in case of HOT Update with other restrictions same as in previous patch.
>>
>>> The performance numbers for this patch are attached in this mail. It has
improved by 90% if the page has fillfactor 80.
>>
>>> Now going forward I have following options:
>>> a. Upload the patch in Open CF for WAL Reduction which contains
reductution for HOT and non-HOT updates.
>>> b. Upload the patch in Open CF for WAL Reduction which contains
reductution for HOT updates.
>>> c. Upload both the patches as different versions.

>> Let's do it for HOT updates only. Simon & Robert made good arguments on
>> why this is a bad idea for non-HOT updates.

>Okay, I shall do it that way.
>So now I shall send information about all the testing I have done for this
>Patch and then Upload it in CF.

Rebased version of patch based on latest code.

With Regards,

Amit Kapila.