Application APP_A is performing updates to table TAB1 using the cursor stability (CS) isolation level. If application APP_B wants to retrieve all rows from table TAB1 without waiting for application APP_A to finish making updates, what isolation level must application APP_B use、

试卷相关题目

• 1Which type of lock allows the lock owner and all concurrent applications to read, but not update, the locked data、

  A.Share (S)

  B.Update (U)

  C.Exclusive (X)

  D.Intent Exclusive (IX)

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• 2What factor influences lock escalation、

  A.Table size

  B.Buffer space

  C.Number of locks

  D.Available real storage

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• 3Which isolation level offers the greatest protection of data but provides the least amount of concurrency、

  A.Read Stability (RS)

  B.Cursor Stability (CS)

  C.Repeatable Read (RR)

  D.Uncommitted Read (UR)

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• 4What is the primary function of an Online Transaction Processing (OLTP) workload、

  A.To combine data from multiple sources.

  B.To discover hidden relationships in data.

  C.To analyze large amounts of data to find patterns.

  D.To make changes to a small number of records within a single transaction.

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• 5Which two activities indicate the need for a data warehouse、 (Choose two.)

  A.Confirm product inventory.

  B.Monitor product availability.

  C.Summarize sales by region.

  D.Identify patterns for products sold in the last five years.

  E.Associate one or more products with a purchase order.

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• 6Which statement will prevent concurrent application processes from performing anything other than read-only operations against a table named TAB1、

  A.LOCK TABLE tab1 IN READ MODE

  B.LOCK TABLE tab1 IN SHARE MODE

  C.LOCK TABLE tab1 IN EXCLUSIVE MODE

  D.LOCK TABLE tab1 IN READ-ONLY MODE

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• 7When 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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• 8What is the act of exchanging one lock an application holds on a resource for a more restrictive lock on the same resource known as、

  A.Lock escalation

  B.Lock substitution

  C.Lock switch/exchange

  D.Lock conversion/promotion

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• 9What 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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• 10Which operation normally does NOT require an exclusive lock、

  A.BIND

  B.DROP

  C.GRANT

  D.SELECT

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