C2090-610

C2090-610 practice questions, page 5 of 6, with answer review and explanations.

Question 21

Which isolation level offers the greatest protection of data but provides the least amount of concurrency?

  1. Read Stability (RS)
  2. Cursor Stability (CS)
  3. Repeatable Read (RR)
  4. Uncommitted Read (UR)

Question 22

What factor influences lock escalation?

  1. Table size
  2. Buffer space
  3. Number of locks
  4. Available real storage

Question 23

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

  1. Share (S)
  2. Update (U)
  3. Exclusive (X)
  4. Intent Exclusive (IX)

Question 24

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?

  1. Read Stability (RS)
  2. Repeatable Read (RR)
  3. Uncommitted Read (UR)
  4. Cursor Stability (CS)

Question 25

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

  1. LOCK TABLE tab1 IN READ MODE
  2. LOCK TABLE tab1 IN SHARE MODE
  3. LOCK TABLE tab1 IN EXCLUSIVE MODE
  4. LOCK TABLE tab1 IN READ-ONLY MODE