On 10/19/2010 08:51 PM, Robert Haas wrote:
> On Tue, Oct 19, 2010 at 5:42 PM, Andrew Dunstan<andrew@dunslane.net> wrote:
>> Well a bit more testing shows some benefit. I've sorted out a few kinks, so
>> this seems to work. In particular, with the above tables, the version
>> imported from 9.0 can create have an index created in about the same time as
>> on the fresh table (identical data, but all even numbered Oids).
>>
>> Of course, with lots of odd numbered Oids, if a label gets added the
>> imported version will degrade in performance much more quickly.
> I'm quite impressed by the amount of time and thought being put into
> optimizing this. I didn't realize people cared so much about enum
> performance; but it's good that they do.
>
> I hope to see more such efforts in other parts of the system.
:-)
Efficiency has always been one of the major reasons for using enums, so
it's important that we make them extensible without badly affecting
performance.
cheers
andrew