One Quickie

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Increasing memory buffer sizes (Postgresql->Administration)

If you try upping your shared_buffers in your postgresql.conf, and get an error similar to this:

IpcMemoryCreate: shmget(key=5432001, size=266371072, 03600) failed: 
Invalid argument
This error usually means that PostgreSQL's request for a shared memory
segment exceeded your kernel's SHMMAX parameter. 

You should increase your the shmmax parameters using tips in the Unix administration quickies.