Thomas Finneid wrote:
Hi
During the somes I did I noticed that it does not necessarily seem to be
true that one needs the fastest disks to have a pg system that is fast.
It seems to me that its more important to:
- choose the correct methods to use for the operation
- tune the pg memory settings
- tune/disable pg xlog/wal etc
It also seems to me that fast disks are more important for db systems of
the OLTP type applications with real concurrency of both readers and
writes across many, possibly larger, tables etc.
Are the above statements close to having any truth in them?
regards
thomas
I'd say that "it depends". We run an OLAP workload on 350+ gigs of database on
a system with 64GB of RAM. I can tell you for certain that fetching non-cached
data is very sensitive to disk throughput!
Different types of workloads will find different bottlenecks in the system..
-Dan
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