Oracle Hint Behavior
Oracle 10.2.0.3.0
Windows 2003 Server
What is the behavior of hints in Oracle 10g? I knew that prior to 10g
Oracle would treat them as only "suggestions" but I thought in 10g they
would be mostly followed.
We have a query which is doing a full table scan even with hints being used
to try to get it to use an index. I can see why it would choose a full
table scan considering the percentage of the table being returned but I'd
like to be able to explain why the hint is being ignored now.
Thanks.
.
Relevant Pages
- Re: Hints in Practice
... and do not conform to any standard. ... Thus you don't use array processing, don't use exception handling, don't use PL/SQL packages, and heaven-forbid don't use any type of index other ... then embrace Oracle. ... If they are confident about the optimizer, why are hints necessary? ... (comp.databases.oracle.server) - Re: Hints in Practice
... Are there any other Oracle features do what RAC does? ... hints if you want to force Oracle's CBO to use a specific plan. ... Those cases would be when the optimizer is not doing its job. ... (comp.databases.oracle.server) - Re: Help with sql query speed. Explain plan included
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... consultants might be over looking that could cause high cpu usage with ... Puget Sound Oracle Users Groupwww.psoug.org- Hide quoted text - ... erp doesn't have any hints that I have ever seen in the sql that is ... I have seen some recursive sql that have hints but that is ... (comp.databases.oracle.server) - Re: Hints in Practice
... The analogy holds. ... Are there any other Oracle features do what RAC does? ... hints if you want to force Oracle's CBO to use a specific plan. ... Those cases would be when the optimizer is not doing its job. ... (comp.databases.oracle.server) |
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