What are the different approaches used by Optimizer in choosing an execution plan ?

What are the different approaches used by Optimizer in
choosing an execution plan ?
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1 Answer

Answer :

Rule-based and Cost-based.
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Related questions

What are the different approaches used by Optimizer in choosing an execution plan?

Description : What are the different approaches used by Optimizer in choosing an execution plan?

Last Answer : Rule-based and Cost-based.

What is the effect of setting the value "ALL_ROWS" for OPTIMIZER_GOAL parameter of the ALTER SESSION command ? What are the factors that affect OPTIMIZER in choosing an Optimization approach ?

Description : What is the effect of setting the value "ALL_ROWS" for OPTIMIZER_GOAL parameter of the ALTER SESSION command ? What are the factors that affect OPTIMIZER in choosing an Optimization approach ?

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 are the values that can be specified for OPTIMIZER MODE Parameter ?

Last Answer : COST and RULE.

What is the function of Optimizer ?

Description : What is the function of Optimizer ?

Last Answer : The goal of the optimizer is to choose the most efficient way to execute a SQL statement.

What is Execution Plan ?

Description : What is Execution Plan ?

Last Answer : The combinations of the steps the optimizer chooses to execute a statement is called an execution plan.

Can you see Execution Plan of a statement?

Description : Can you see Execution Plan of a statement?

Last Answer : YES. In many ways, for example from GUI based tools like TOAD, Oracle SQL Developer. Configuring AUTOTRACE, a SQL*Plus facility AUTOTRACE is a facility within SQL*Plus to show us the explain plan of the ... - Like SET AUTOTRACE ON, but suppresses the printing of the user's query output, if any.

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Description : What are two virtual tables available during database trigger execution ?

Last Answer : The table columns are referred as OLD.column_name and NEW.column_name. For triggers related to INSERT only NEW.column_name values only available. For triggers related to UPDATE only OLD. ... values only available. For triggers related to DELETE only OLD.column_name values only available.

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Description : At what point of report execution is the before Report trigger fired?

Last Answer : After the query is executed but before the report is executed and the records are displayed.

Give the sequence of execution of the various report triggers?

Description : Give the sequence of execution of the various report triggers?

Last Answer : Before form , After form , Before report, Between page, After report.

Is the After report trigger fired if the report execution fails?

Description : Is the After report trigger fired if the report execution fails?

Last Answer : Yes.

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Description : What are the different plan types available in Fusion Absence Management?

Last Answer : There are three different plan types available in Fusion Absence Management, which are given below: Accrual Use this type to create absence plans that enable workers to accrue time for the ... plan to pay workers if they are not eligible for a standard maternity absence qualification plan.

Credit Card Optimizer?

Description : Credit Card Optimizer?

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__________ falls under the A/B testing tools. a. Google Content Experiments b. Visual Website Optimizer c. Both (a) and (b) d. None of the above

Description : __________ falls under the A/B testing tools. a. Google Content Experiments b. Visual Website Optimizer c. Both (a) and (b) d. None of the above

Last Answer : c. Both (a) and (b)

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Last Answer : Motorized knapsack sprayer

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Description : Han optimizer sprayer has container of to litres capacity. a) 0.5 to 4.5 b) 0.1 to 3.4 c) 0.5 to 3.5

Last Answer : 0.5 to 3.5

What is the function of Optimizer?

Description : What is the function of Optimizer?

Last Answer : The goal of the optimizer is to choose the most efficient way to execute a SQL statement.

Which statement best describes the emphasis of the systems and substantive approaches in the audit plan? a. A thoroughly designed systems approach to auditing can eliminate the need for any substantive procedures. b. The systems approach focuses on detailed testing of specific accounts for accuracy, while the substantive approach is the testing controls to make sure they are effective. c. The systems approach focuses on testing controls to make sure they are effective, while the substantive approach is the detailed testing of specific accounts for accuracy. d. The systems approach focuses on the use of computer systems to aid in the audit while the substantive approach focuses on more manual tests

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Last Answer : The systems approach focuses on testing controls to make sure they are effective, while the substantive approach is the detailed testing of specific accounts for accuracy

How would you go about generating an EXPLAIN plan?

Description : How would you go about generating an EXPLAIN plan?

Last Answer : Create a plan table with utlxplan.sql. Use the explain plan set statement_id = 'tst1' into plan_table for a SQL statement Look at the explain plan with utlxplp.sql or utlxpls.sql

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Last Answer : e. Developing a project execution plan that matches the complexity level of the project

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Last Answer : a. layered description

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Last Answer : a. risks need to be checked off on activities that have been performed.

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Description : Incorrect information results in unsatisfied preconditions for actions and plans _____________ detects violations of the preconditions for successful completion of the plan. a) Conditional Plan b) Conformant Planning c) Execution monitoring d) Both Conditional Plan & Execution monitoring

Last Answer : c) Execution monitoring

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Last Answer : a) True

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Description : What is Execution Plan?

Last Answer : The combinations of the steps the optimizer chooses to execute a statement is called an execution plan.

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Description : What are the Different Optimisation Techniques

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Suppose a customer table is having different columns like customer no, payments.What will be the query to select top three max payments?

Description : Suppose a customer table is having different columns like customer no, payments.What will be the query to select top three max payments?

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Description : What are the different types of Package Procedure ?

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Description : What are the different types of key triggers ?

Last Answer : Function Key Key-function Key-others Key-startup

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Description : What are the different methods of backing up oracle database ?

Last Answer : Logical Backups - Cold Backups - Hot Backups (Archive log)

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Description : How will you swap objects into a different table space for an existing database ?

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