Searching for Oracle Rule Hint Support information? Find all needed info by using official links provided below.
https://community.oracle.com/thread/1052506
Mar 29, 2010 · Even if Oracle is saying RULE hint should not be used or de-supported in 11g, but it still exists. Normally oracle will remove the feature from a version after 2 versions. e.g. exp/imp will no longer supported from next release (May be 12g) but it is still supported in 11g even if they recommend us to use expdp/impdp.
https://docs.oracle.com/cd/E18283_01/server.112/e16638/hintsref.htm
19.1.2.2 Hints for Enabling Optimizer Features. The OPTIMIZER_FEATURES_ENABLE hint acts as an umbrella parameter for enabling a series of optimizer features based on an Oracle Database release number. This hint is a useful way to check for plan regressions after database upgrades. Specify the release number as an argument to the hint.
http://www.dba-oracle.com/oracle_tips_rbo_cbo.htm
OPTIMIZER_MODE=RULE is not supported in Oracle Database 11g; the code has only been left in Oracle to enable easy migrations from RBO to CBO. We do not recommended you use OPTIMIZER_MODE=RULE as a long term strategy in Oracle Database 11g as the code can be removed at any time now that it is de-supported.
http://www.dba-oracle.com/t_sql_hints_tuning.htm
The hint forces query execution to be done at a different site than that selected by Oracle. This hint can be used with either rule-based or cost-based optimization. LEADING(table) The hint causes Oracle to use the specified table as the first table in the join order. Oracle Hints …
https://blogs.oracle.com/optimizer/why-was-the-rule-hint-ignored
Dec 19, 2011 · The RULE mode is ignored if the statement contains hints other than the RULE hint itself, hence their cost based plan. Although the RBO was depreciated in Oracle Database 10g, the RULE mode and hint are still honored assuming the query can actually use the RBO. The following object / query properties force the CBO to be used even when the RULE ...
http://www.orafaq.com/forum/t/45596/0/
I am using the Oracle Database 9.2 and I am using /*+ RULE */ hint into some queries to obtain the correct Join orders and they are working fine. My doubt is will this hint create any problem if my DB is upgraded to 10g. Please give me all the negative impacts of this hint in 10g. Please Reply me soon as it is really urgent. Thanks in Advance ...
https://support.oracle.com/
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http://www.remote-dba.net/t_op_sql_optimizer_hints.htm
Optimizer mode hints are used to redirect the overall optimizer goal. The most common mode for SQL tuning is the rule hint, which is used when you suspect that the CBO is using a suboptimal execution plan. It should be noted that the optimizer hints only cause Oracle to apply the optimizer to the SQL, and additional hints can still be added for further tuning.
https://www.red-gate.com/simple-talk/sql/oracle/a-beginners-guide-to-optimizer-hints/
Nov 25, 2013 · A Beginner’s Guide to Optimizer Hints. ... LEADING(table_name): This hint tells Oracle to use the parameterised table as the first in the join order. The optimizer will consequently select a join chain that starts with this table. ... RULE: This hint basically turns off the optimizer. This hint has been deprecated and should not be used.
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