Q. A concurrency-control policy such as this one leads to ______ performance, since it forces transactions to wait for preceding transactions to finish before they can start.

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Q. __________ are used to ensure that transactions access each data item in order of the transactions’ ____ if their accesses conflict.

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Q. EMPDET is an external table containing the columns EMPNO and ENAME. Which command would work in relation to the EMPDET table?

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Q. In which scenario would you use the ROLLUP operator for expression or columns within a GROUP BY clause?

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Q. Which statement is true regarding external tables?

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Q. A non-correlated subquery can be defined as ______

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Q. Which of the following is not a property of transactions?

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Q. SNAPSHOT is used for (DBA)

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Q. Isolation of the transactions is ensured by

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Q. Constraint checking can be disabled in existing _______________ and _____________ constraints so that any data you modify or add to the table is not checked against the constraint.

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