Re: Sorting performance vs. MySQL

Op 22 feb 2010, om 20:28 heeft Yang Zhang het volgende geschreven:
>
>
>>
>>
>>>> If your work-mem is too low there's a good chance that Postgres
>>>> has to
>>>> use your disks for sorting, which will obviously be quite slow.
>>>
>>> Relative to the non-terminating 80-minute-so-far sort, Unix sort
>>> runs
>>> much faster (on the order of several minutes).
>>
>> Make sure your index does fit into memory, what's the size of the
>> index?
>
> How might I find out the size and whether it's being fit in memory?

SELECT pg_size_pretty(pg_relation_size('i_transactionid'));


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> Yang Zhang
> http://www.mit.edu/~y_z/
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Frank Heikens