What is Cost Based Optimization?

What is Cost Based Optimization?
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The Oracle Cost Based Optimizer (CBO) is a SQL Query optimizer that uses data statistics to identify the query plan  with lowest cost before execution. The cost is based on the number of rows in a table, index efficiency, etc. All applications should be converted to use the Cost Based Optimizer as the Rule Based Optimizer is not be  supported in Oracle 10g and above releases.
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Related questions

When is cost based optimization triggered? (for DBA

Description : When is cost based optimization triggered? (for DBA

Last Answer : It's important to have statistics on all tables for the CBO (Cost Based Optimizer) to work correctly. If one table involved in a statement does not have ... ANALYZE; 2. Change some initialization parameters (for example: hash_join_enabled, sort_area_size, db_file_multiblock_read_count).

What is COST-based approach to optimization ?

Description : What is COST-based approach to optimization ?

Last Answer : Considering available access paths and determining the most efficient execution plan based on statistics in the data dictionary for the tables accessed by the statement and their associated clusters and indexes.

What is RULE-based approach to optimization ?

Description : What is RULE-based approach to optimization ?

Last Answer : Choosing an executing planbased on the access paths available and the ranks of these access paths.

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Last Answer : Answer The OPTIMIZER_MODE initialization parameter Statistics in the Data Dictionary the OPTIMIZER_GOAL parameter of the ALTER SESSION command hints in the statement.

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Description : What is meant by query optimization?

Last Answer : The phase that identifies an efficient execution plan for evaluating a query that has the least estimated cost is referred to as query optimization.

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what search engine optimization services?

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