Oracle Interview Questions

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Can one rename a database user (schema)? (for DBA)

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How are extents allocated to a segment? (for DBA)

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What does COMMIT do ?

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What is COST-based approach to optimization ?

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Where can one find the high water mark for a table? (for DBA)

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How does one prevent tablespace fragmentation? (for DBA)

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How does one coalesce free space ? (for DBA)

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What does ROLLBACK do ?

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What database block size should I use? (for DBA)

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How does one create a new database? (for DBA)

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What is the effect of setting the value “CHOOSE” for OPTIMIZER_GOAL, parameter of the ALTER SESSION Command ?

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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 ?

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When does a Transaction end ?

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What is Index Cluster ?

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What is difference between UNIQUE constraint and PRIMARY KEY constraint ?

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