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 Data Access  |  Question 10 of 27    Print  
What are the factors that affect OPTIMIZER in choosing an Optimization approach ?
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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The  goal of the optimizer is to choose the most efficient way to execute a SQL statement. 
Latest Answer : The optimizer determines the most efficient way to use the tables and indexes to complete the request made by an SQL statement after considering many factors related to the objects referenced and the conditions specified in the query. ...

The  combinations of the steps the optimizer chooses to execute a statement is called an execution plan. 
Latest Answer : The operations that the oracle server performs to execute a SQL statement. ...

What  are  the  different approaches used by Optimizer in choosing an execution plan ?
Rule-based and Cost-based. 

The   OPTIMIZER_MODE   initialization  parameter  Statistics  in  the  Data Dictionary  the OPTIMIZER_GOAL parameter of the ALTER SESSION command hints 

COST and RULE. 
Latest Answer : One can specify COST , RULE or CHOOSE for OPTIMIZER _MODE in init.ora file ...

What  is the effect of setting the value "CHOOSE" for OPTIMIZER_GOAL, parameter of the ALTER SESSION Command ?
The  Optimizer  chooses  Cost_based approach and optimizes with the goal of best throughput if statistics for atleast one of the tables accessed by the SQL statement exist in the data dictionary. 

What is the effect of setting the value "ALL_ROWS"  for OPTIMIZER_GOAL parameter of the ALTER SESSION  command ?
This  value  causes  the  optimizer to the cost-based approach for  all SQL statements  in  the session regardless of the presence of statistics and to optimize with 

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

Considering  available  access  paths  and  determining  the most efficient execution  plan  based  on statistics in the data dictionary for the tables accessed 


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