| From: | Christian Schröder <cs(at)deriva(dot)de> |
|---|---|
| To: | Grzegorz Jaśkiewicz <gryzman(at)gmail(dot)com> |
| Cc: | Simon Riggs <simon(at)2ndquadrant(dot)com>, pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Performance of full outer join in 8.3 |
| Date: | 2009-04-16 11:31:45 |
| Message-ID: | 49E71721.4000800@deriva.de |
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| Lists: | pgsql-general pgsql-hackers |
Grzegorz Jaśkiewicz wrote:
> On Wed, Apr 15, 2009 at 1:25 PM, Simon Riggs <simon(at)2ndquadrant(dot)com> wrote:
>
>> The cost of the query seems accurate, so the absence of
>> attachment_isins_attachment_idx on the 8.3 plan looks to be the reason.
>> There's no way it would choose to scan 8115133 rows on the pkey if the
>> other index was available and usable.
>>
>
> hance my question, if there's index on it in 8.3 version of db.
>
I added an index on this column, but it didn't change the query plan.
Stupid question: Do I have to analyze again or perform a reindex after
adding the index?
Regards,
Christian
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