Oracle Data Access Interview Questions and Answers

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Oracle Data Access guideline for job interview preparation. Explore list of Data Access frequently asked questions(FAQs) asked in number of Oracle Data Access interviews. Post your comments as your suggestions, questions and answers on any Data Access Interview Question or answer. Ask Data Access Question, your question will be answered by our fellow friends.

  1. Oracle Data Access questions updated at 17 May 11 in Category Oracle and visited 626 Times

Data Access Questions and Answers:

1 :: Explain What are the values that can be specified for OPTIMIZER MODE Parameter?

COST and RULE.
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2 :: Explain 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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3 :: Explain What are the values that can be specified for OPTIMIZER_GOAL parameter of the ALTER SESSION Command?

CHOOSE,
ALL_ROWS,
FIRST_ROWS and
RULE.
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4 :: What is COST-based approach to optimization?

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.
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5 :: Explain What does ROLLBACK do?

ROLLBACK retracts any of the changes resulting from the SQL statements in the transaction.
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