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IBM DB2 9.7 Advanced DBA for LUW Sample Questions:

1. Your UNIX system administrator has indicated that there appears to be a lot of I/O wait time associated with your database, which is stored in a 7+p RAID array. An investigation reveals the following information: DB2_PARALLEL_IO=*
Tablespace with ID 7 has a single container and is dedicated to the largest table. It has a page size of 16K, an extent size of 32, and a prefetch size of 64.
Which setting would optimize I/O for the largest table?

A) DB2_PARALLEL_IO=7:16
B) DB2_PARALLEL_IO=7:7
C) DB2_PARALLEL_IO=7:32
D) DB2_PARALLEL_IO=7:64

2. When the DBA chooses the dimensions for a multi-dimensional clustering (MDC) table, which two characteristics should be considered? (Choose two.)

A) numeric data versus character data
B) prefetch size
C) extent size
D) the combined cardinality of the candidate columns
E) the query transaction rate

3. 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 and C3 together, which statement(s) will create index(es) that will provide optimal query performance?

A) CREATE UNIQUE INDEX xtab1 ON tab1 (c3, c2, c1);
B) CREATE UNIQUE INDEX xtab1 ON tab1 (c1) INCLUDE (c2, c3);
C) CREATE UNIQUE INDEX xtab1 ON tab1 (c1); CREATE INDEX xtab2 ON tab1 (c2) INCLUDE (c3);
D) CREATE UNIQUE INDEX xtab1 ON tab1 (c2) INCLUDE (c1, c3);

4. Which database configuration parameters can be used to limit the amount of memory allocated for the LOAD utility?

A) LOAD_HEAP_SZ and DATABASE_MEMORY
B) LOAD_HEAP_SZ and STAT_HEAP_SZ
C) UTIL_HEAP_SZ and STAT_HEAP_SZ
D) UTIL_HEAP_SZ and DATABASE_MEMORY

5. If you know that the table space containers for your database reside on RAID-5 3+p arrays, which registry variable should be assigned the value *:3 to help improve performance?

A) DB2_APM_PERFORMANCE
B) DB2_PARALLEL_IO
C) DB2_EXTENDED_IO_FEATURES
D) DB2_RESOURCE_POLICY

Solutions: