On 01/09/2018 12:22 PM, Andres Freund wrote:
On 2018-01-09 20:04:04 +0100, Rakesh Kumar wrote:
I also would like to believe that the hit is small, but when PG
official document writes "noticeable performance penalty", it becomes
difficult to convince management that the hit is small :-)
Why believe, when you can measure?
yup doing that. But I still feel that PG documentation should stay
away from such scare mongering. Or did the lawyers write that :)
So we should rather lie about it having a potential for performance
impact? Who'd be helped by that?
It isn't a lie, it depends on the workload and hardware. Adjusting the
documentation to say something like the following probably isn't a bad idea:
The use of the data checksum feature may incur a performance penalty.
However, this does depend on your particular workload and provisioned
hardware. It is wise to test the feature based on your specific
requirements.
JD
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