IBM IBM Certifications C2090-558 Questions & Answers

• Question 111:

  Why would you want to create a table with a lock mode row as opposed to a lock mode page?

  A. to reduce disk I/O

  B. to keep more information in memory for each locked row

  C. to increase concurrency among multiple users on the same table

  D. to reduce the number of locks when accessing rows out of the table

  Correct Answer: C

• Question 112:

  Which isolation level is appropriate if you do not want your query to place any locks?

  A. Dirty Read

  B. Cursor Stability

  C. Committed Read

  D. Repeatable Read

  Correct Answer: A

• Question 113:

  What are two ways to create table t1 with row level locking? (Choose two.)

  A. Execute the command "create table t1 (c1 int) locking row".

  B. Execute the command "create table t1 (c1 int) lock level row".

  C. Execute the command "create table t1 (c1 int) lock mode row".

  D. Set DEF_TABLE_LOCKMODE to ROW in ONCONFIG before executing "create table t1(c1 int)".

  E. Set the environment variable DEF_TABLE_LOCKMODE to ROW before executing "create table t1(c1 int)".

  Correct Answer: CD

• Question 114:

  You have a database server environment where all databases use buffered logging. In which two conditions are the logical-log buffers in shared memory flushed to the logical log on disk? (Choose two.)

  A. When the buffer is full.

  B. When a checkpoint occurs.

  C. When a user issues a begin work.

  D. When a user commits the transaction.

  E. When a user rolls back the transaction.

  Correct Answer: AB

• Question 115:

  Under which of the following conditions does the LAST COMMITTED option have an effect on the COMMITTED READ isolation level?

  A. Row level lock

  B. Page level locking

  C. RAW or unlogged tables

  D. Tables containing complex data types

  Correct Answer: A

• Question 116:

  Which command option should be used to resume an interrupted onbar restore?

  A. -RETRY

  B. -RESTART

  C. -REINTIIALZE

  D. -BEGIN_AGAIN

  Correct Answer: B

• Question 117:

  Click the Exhibit button.

  

  In the exhibit, which statement is true regarding the update statement of Client 2 if both of the clients are connected to the same logged database?

  A. Client 2 will update col2 of the rows having col1=20.

  B. Client 2 will return successfully without updating any rows.

  C. Client 2 will keep waiting for client 1 to finish its transaction.

  D. Client 2 will get an error that the "record is locked" or the "table is locked".

  Correct Answer: D

• Question 118:

  Click the Exhibit button.

  

  An administrator created a table using the SQL statement shown in the exhibit to perform a load operation every day at 11:00 AM. What is the best way to optimize a backup strategy to recover the client table in case of a failure?

  A. a level-1 backup at 6:00 AM everyday

  B. a level-0 backup soon after the load operation

  C. a level-1 backup on Sunday and continuous log backup

  D. a level-2 backup at 6:00 AM every day and continuous log backup

  Correct Answer: B

• Question 119:

  When restoring data, which granularity of object may NOT be restored?

  A. a single table

  B. a single chunk

  C. a single dbspace

  D. an entire instance

  Correct Answer: B

• Question 120:

  Which command would you execute to restore to a specific moment-in-time?

  A. onbar -t timestamp

  B. onbar -r -log lognum

  C. onbar -r -t timestamp

  D. onbar -r -l timestamp

  Correct Answer: C