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Oracle Sample Questions : Oracle General Questions

  1. Where would you look for errors from the database engine?

    Answer: In the alert log.

  2. Compare and contrast TRUNCATE and DELETE for a table.

    Answer: Both the truncate and delete command have the desired outcome of getting rid of all the rows in a table.The difference between the two is that the truncate command is a DDL operation and just moves the high water mark and produces a now rollback.The delete command, on the other hand, is a DML operation, which will produce a rollback and thus take longer to complete.

  3. Give the reasoning behind using an index.

    Answer: Faster access to data blocks in a table.

  4. Give the two types of tables involved in producing a star schema and the type of data they hold.

    Answer: Fact tables and dimension tables.A fact table contains measurements while dimension tables will contain data that will help describe the fact tables.

  5. What type of index should you use on a fact table?

    Answer: A Bitmap index

  6. Explain the difference between $ORACLE_HOME and $ORACLE_BASE.

    Answer: ORACLE_BASE is the root directory for oracle.ORACLE_HOME located beneath ORACLE_BASE is where the oracle products reside.

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