Very dangerous. I only did it as a test to guestimate what kind of performance I might get if I got a static ram hard drive to put the WAL onto.


Dann Corbit wrote:
Isn't putting the WAL in memory dangerous in case of a power failure?
I would think that RI would be compromised.

-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of William Yu
Sent: Thursday, January 27, 2005 12:41 PM
To: pgsql-general@postgresql.org
Subject: Re: [GENERAL] Splitting queries across servers

With a Quad Opteron (4 memory slots per CPU), you could put 64GB of RAM onto a single machine using 4GB DIMMs in every slot.

The other option is to explore static memory storage. It's probably too expensive to put your entire DB onto such a device but moving just the WAL there would give you a pretty decent jump in write performance. (I ran some tests way back simulating this by using a RAMDISK to store the WAL files and got ~60% increase in an update-heavy mix.)


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