IBM IBM Certified Advanced Database Administrator A2090-544 Questions & Answers

• Question 31:

  Which description is correct when discussing the DB2_MEM_TUNING_RANGE registry variable?

  A. It is recommended to set this variable only when the Self-Tuning Memory Manager (STMM) is disabled.

  B. It is recommended to set this variable only when using STMM, when DATABASE_MEMORY is set to AUTOMATIC, and if insufficient system memory problems are occurring.

  C. It is recommended that this variable be enabled at all times in order to prevent DB2 from taking too much physical memory.

  D. It is recommended that this variable be used to set the maximum percentage of memory that DB2 can use on the system.

  Correct Answer: B

• Question 32:

  Table TAB1 was created using the following statement: CREATE TABLE tab1 (c1 INT, c2 INT, c3 INT, c4 INT, c5 INT); If column C1 is unique and queries typically access columns C1, C2, C3 and C4 together, which statement(s) will create index(es) that will provide optimal query performance?

  A. CREATE UNIQUE INDEX xtab1 ON tab1 (c1);CREATE INDEX xtab2 ON tab1 (c2) INCLUDE (c3, c4);

  B. CREATE UNIQUE INDEX xtab1 ON tab1 (c1) INCLUDE (c2, c3, c4);

  C. CREATE UNIQUE INDEX xtab1 ON tab1 (c4, c3, c2, c1);

  D. CREATE UNIQUE INDEX xtab1 ON tab1 (c3) INCLUDE (c1, c2, c4);

  Correct Answer: B

• Question 33:

  A DBA wants to migrate a DB2 LUW 8.2.2 database to version 9.7 and plans to use currently committed

  (CC)

  semantics on an application-by-application basis. Which process will yield the desired results?

  A.

  Set the DB2_USE_CC_SEMANTICS registry variable to YES, then migrate the database.

  B.

  Migrate the database, then assign the value ON to the CURR_COMMIT configuration parameter.

  C.

  Set the DB2_USE_CC_SEMANTICS registry variable to APPLICATION, then migrate the database.

  D.

  Migrate the database, then assign the value AVAILABLE to the CURR_COMMIT configuration parameter.

  Correct Answer: D

• Question 34:

  A table named TAB_A was created with the COMPRESS YES option specified and populated with 100,000 rows. If a DBA wants to create an index on table TAB_A, which statement is true?

  A. In order for the index to be compressed, it must be enabled for compression by specifying the COMPRESS YES option with the CREATE INDEX statement that is used to create it.

  B. The index will automatically be compressed since the table it is associated with is compressed; the ALTER INDEX command does not have to be executed.

  C. In order for the index to be compressed, it must be enabled for compression by specifying the COMPRESS YES option in the CREATE INDEX statement used to create it; however, the index will not be compressed until the ALTER INDEX command is used to create an index compression dictionary.

  D. The index will automatically be enabled for compression because the associated table is compressed; however, the index will not be compressed until it is REORGed.

  Correct Answer: B

• Question 35:

  When an agent that is connected to the database finishes its work of successfully processing a query, what happens to the agent?

  A. It terminates immediately.

  B. It remains active as long as the MAXAGENTS setting is not exceeded.

  C. It is placed in the agent pool if the connection is terminated.

  D. It automatically releases the database connection and returns to the pool.

  Correct Answer: C

• Question 36:

  What would indicate intra-partition parallelism in an Optimizer Plan?

  A. BTQ

  B. LTQ

  C. IP

  D. DTQ

  Correct Answer: B

• Question 37:

  A DBA migrating an existing database to DB2 9.7 wants to allow the primary and secondary recovery logs to be used with non-buffered IO. Which statement is true?

  A. This behavior is automatically enabled by default.

  B. The DB2_LOGGER_BUFFERED registry variable must be set to OFF.

  C. The DB2_LOGGER_AUTO_BUFFERED registry variable must be set to YES.

  D. The DB2_LOGGER_NON_BUFFERED_IO registry variable must be set to AUTO.

  Correct Answer: A

• Question 38:

  Which action(s) will cause a compression dictionary to be removed from a table?

  A. Set the table COMPRESS attribute to NO.

  B. Set the table COMPRESS attribute to NO;run REORG against the table.

  C. Set the table COMPRESS attribute to NO;run INSPECTESETDICTIONARY against the table.

  D. Set the table COMPRESS attribute to NO;run RUNSTATS against the table.

  Correct Answer: B

• Question 39:

  Which statement is correct about statistical views?

  A. A statistical view is created by executing runstats on a regular view.

  B. A statistical view holds information about the system catalog statistical tables.

  C. A statistical view provides the optimizer with additional correlation statistics.

  D. A statistical view provides the optimizer with more accurate cardinality estimates.

  Correct Answer: D

• Question 40:

  Which registry variable allows you to limit the size of individual containers for automatic storage table spaces?

  A. DB2_LIMIT_AS_CONTAINER_BLOCKS

  B. DB2_SET_MAX_CONTAINER_SIZE

  C. DB2_ALLOCATION_SIZE

  D. DB2_TRUNCATE_AS_STORAGE

  Correct Answer: B