QUESTION: 5

Which statement about NOT ENFORCED unique constraints is TRUE?

NOT ENFORCED unique constraints can not be defined on primary key columns
The query optimizer will consider a NOT ENFORCED unique constraint when selecting an optimal data access plan
When attempting to insert data that does not conform to a NOT ENFORCED unique constraint, a warning will be returned
Storage requirements for a NOT ENFORCED unique constraint are no different than the storage requirements for a similar unique index

Answer(s): A

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QUESTION: 6

What is an advantage of using range partitioned tables?

Ability to run utilities against the partitions in parallel
Increased query performance through data partition elimination
Block indexes are much smaller than RID indexes, providing better performance
Table data is automatically and continuously clustered, requiring minimal reorganization

Answer(s): B

Reference:

https://www.ibm.com/developerworks/data/library/techarticle/dm-0605ahuja2/#query

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A table named MYTABLE contains an XML column and an XML storage object dictionary already exists. What is the effect of enabling compression and then running the command REORG TABLE mytable KEEPDICTIONARY?

All data, both new and existing, will be compressed.
Only new or updated data for XML columns will be compressed.
New and existing XML columns will be compressed but other columns remain unchanged.
Existing data will remain uncompressed because the RESETDICTIONARY option of the REORG command was not used.

Answer(s): D

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QUESTION: 8

The DBA has observed that queries executed against SALES table have poor performance. SALES is a compressed table and recently there have been a lot of rows inserted and modified in that table. The DBA has detected that lower performance may be the result of sub-optimal compression dictionary for that table.

Which of the following commands should be used to resolve the problem without preventing users from changing data in the SALES table

REORG TABLE sales INPLACE RESETDICTIONARY
REORG TABLE sales INPLACE REBUILDDICTIONARY
REORG TABLE sales ALLOW WRITE ACCESS RESETDICTIONARY
REORG TABLE sales ALLOW WRITE ACCESS REBUILDDICTIONARY

Answer(s): C

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QUESTION: 5

QUESTION: 6

Reference:

QUESTION: 7

QUESTION: 8