RE: HASH GROUP BY
- From: "Elliott, Patrick" <patrick.elliott@xxxxxxxxxxxxx>
- To: "david@xxxxxxxxxxxxxxxxxx" <david@xxxxxxxxxxxxxxxxxx>, "oracle-l@xxxxxxxxxxxxx" <oracle-l@xxxxxxxxxxxxx>
- Date: Wed, 23 Apr 2008 16:07:31 -0500
I stand corrected. These are some serious bugs!
Pat
________________________________
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of David Aldridge
Sent: Wednesday, April 23, 2008 3:38 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: Re: HASH GROUP BY
There have also been a few genuine bugs as well -- I'm using it in 10.2.0.2 and
haven't seen any issues though.
Searching the metalink bug database for _gby_hash_aggregation_enabled=false
generally shows them.
----- Original Message ----
From: "Elliott, Patrick" <patrick.elliott@xxxxxxxxxxxxx>
To: "Elliott, Patrick" <patrick.elliott@xxxxxxxxxxxxx>;
"Rob.Dempsey@xxxxxxxxxx" <Rob.Dempsey@xxxxxxxxxx>; "oracle-l@xxxxxxxxxxxxx"
<oracle-l@xxxxxxxxxxxxx>
Sent: Wednesday, April 23, 2008 3:20:58 PM
Subject: RE: HASH GROUP BY
Now I understand what you mean by buggy. It no longer sorts the rows. If you
have code that relies on a group by being in sorted order, then the code will
no longer work. If you have had to disable this in the past to get correct
results, then you will need to continue disabling it indefinitely. The only
way to fix it and reenable the hashing group by is to change the code.
select column_a, column_b, count(column_c)
from table_abc
group by column_a, column_b
order by column_a, column_b
You need to add the order by above to your code where you just had the "group
by" alone before.
Pat
________________________________
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of Elliott, Patrick
Sent: Wednesday, April 23, 2008 1:44 PM
To: Rob.Dempsey@xxxxxxxxxx; oracle-l@xxxxxxxxxxxxx
Subject: RE: HASH GROUP BY
This is enabled by default in version 9.2.0.5 and up. Are you explicitly
disabling it in your environment?
Pat
________________________________
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of Rob Dempsey
Sent: Wednesday, April 23, 2008 12:08 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: HASH GROUP BY
Hi
Our current Oracle version -> 10.2.0.1
Does anyone know what version this feature has been fixed in. I would like to
enable the feature, but it seems to have been very buggy (especially with wrong
results)
Rob
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