Re: Oracle 9i hints that are obsolete in 11gR2
- From: Kim Berg Hansen <kibeha@xxxxxxxxx>
- To: big.dave.roberts@xxxxxxxxxxxxxx, "oracle-l@xxxxxxxxxxxxx" <oracle-l@xxxxxxxxxxxxx>
- Date: Sun, 30 Mar 2014 19:37:44 +0200
Rule based optimizer stopped working from version 10.1.
RULE as OPTIMIZER_MODE gives warning and RULE hint is ignored as there is
no longer a rule based optimizer that can follow the old optimizer "rules"
;-)
http://docs.oracle.com/cd/B14117_01/server.101/b10763/compat.htm#sthref318
Regards
Kim Berg Hansen
http://dspsd.blogspot.com
kibeha@xxxxxxxxx
@kibeha
On Sun, Mar 30, 2014 at 5:24 PM, David Roberts <
big.dave.roberts@xxxxxxxxxxxxxx> wrote:
> I haven't done any investigation to to determine why, but the RULE hint
> rarely seems to enhance performance in 11g.
>
> In a previous role we had a standing rule that rule hints would be removed
> by default when upgrading from 9i or 10g to 11g.
>
> Dave
>
>
> On Thu, Mar 27, 2014 at 6:32 PM, Bheemsen Aitha
> <baitha@xxxxxxxxxxxxxxxxx>wrote:
>
>> Thanks to everyone for your great inputs. Your replies definitely help
>> me as a starting point.
>>
>>
>>
>> Thanks
>>
>> *Bheem Aitha*
>>
>>
>>
>> *From:* Dominic Brooks [mailto:dombrooks@xxxxxxxxxxx]
>> *Sent:* Thursday, March 27, 2014 2:56 AM
>> *To:* Hemant-K.Chitale@xxxxxx
>> *Cc:* Bheemsen Aitha; ORACLE-L
>> *Subject:* Re: Oracle 9i hints that are obsolete in 11gR2
>>
>>
>>
>> Also see V$SQL_HINT for a list of hints.
>>
>> I don't think it tells you which are deprecated unless that's reflected
>> in PROPERTY.
>>
>>
>>
>> Interestingly, there is no PARALLEL hint only SHARED which is listed as
>> the inverse of NOPARALLEL/NO_PARALLEL
>>
>> Cheers,
>>
>> Dominic
>>
>>
>>
>> Sent from my iPhone
>>
>>
>>
>
>
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