The following bug has been logged online:

Bug reference:      5767
Logged by:          Darryl Pye
Email address:      darryl...@hotmail.com
PostgreSQL version: 9.01
Operating system:   Windows Server  2008
Description:        Memory Leak
Details: 

A single postgres  process  appears to be constantly growing in memory usage
 until it reaches 100% of memory on the machine.

I have rebooted the server and the problem goes away but then  a single
postgres.exe process continues to  eat memory until it uses all available
ram then i have to restart again.

Machine has 4 gig of ram available.
I am able to watch the process grow constantly at approximately  8kb every
second.

Until it reaches  4gig.

I have made the following configuration changes from default 
shared_buffers = 1GB
wal_buffers = 1MB       
effective_cache_size = 2GB

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