What factor influences lock conversion/promotion、

试卷相关题目

• 1The EXCLUSIVE MODE option of the LOCK TABLE statement is used to prevent which of thefollowing、

  A.Concurrent application processes from performing any operations on the table.

  B.Concurrent application processes from performing any read-only operations on the table.

  C.Concurrent applications processes that are running under the cursor stability (CS) isolation level from performing read-only operations on thetable.

  D.Concurrent applications processes that are running under the uncommitted read (UR) isolation level from performing read-only operations onthe tabl

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• 2When is an INTENT EXCLUSIVE (IX) lock required、

  A.When a transaction intends to read or change data.

  B.When a transaction intends to change but not read data.

  C.When a transaction intends to read but not change data.

  D.When a transaction intends to change the system catalog.

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• 3What is the act of releasing a large number of row-level locks that an application holds on a single table to acquire a table-level lock known as、

  A.Lock exchange

  B.Lock promotion

  C.Lock escalation

  D.Lock conversion

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• 4What takes place when a process accesses a data object on which it already holds a lock, and the access mode requires a more restrictive lock than the one currently held、

  A.Lock wait

  B.Lock timeout

  C.Lock escalation

  D.Lock conversion

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• 5Which statement about a deadlock is true、

  A.The victim will be rolled back.

  B.The victim will read through the lock.

  C.Both victim and holder are rolled back.

  D.The victim must wait until the holder releases the lock.

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• 6Application APP_A is performing updates to table TAB1 using the read stability (RS) isolation level. Which isolation level will allow application APP_B to retrieve all rows from table TAB1 immediately, rather than have to wait until application APP_A has finished making updates、

  A.Read Stability (RS)

  B.Cursor Stability (CS)

  C.Repeatable Read (RR)

  D.Uncommitted Read (UR)

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• 7If no isolation level is specified, what is the default isolation level used、

  A.Cursor Stability (CS)

  B.Repeatable Read (RR)

  C.Read Stability (RS) with Currently Committed semantics

  D.Cursor Stability (CS) with Currently Committed semantics

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• 8What isolation level prevents dirty reads, nonrepeatable reads, and phantoms、

  A.Read stability (RS)

  B.Cursor stability (CS)

  C.Repeatable read (RR)

  D.Uncommitted read (UR)

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