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Share some IBM Certified Database Administrator C2090-600 exam questions and answers below.
Which statement about NOT ENFORCED unique constraints is TRUE? 
A. NOT ENFORCED unique constraints can not be defined on primary key columns 
B. The query optimizer will consider a NOT ENFORCED unique constraint when selecting an optimal data access plan 
C. When attempting to insert data that does not conform to a NOT ENFORCED unique constraint, awarning will be returned 
D. Storage requirements for a NOT ENFORCED unique constraint are no different than the storage requirements for a similar unique index 
Answer: A

Which of the following statements about compression for BLU MPP tables is TRUE? 
A. Compression must be explicitly enabled for BLU MPP tables 
B. Compression requires decompression to evaluate partition joins 
C. Unique compression dictionaries are generated for each partition 
D. Each table has a single compression dictionary that getsreplicated across all partitions 
Answer: D

What is an advantage of using range partitioned tables? 
A. Abilityto run utilities against the partitions in parallel 
B. Increased query performance through data partition elimination 
C. Block indexes are much smaller than RID indexes, providing better performance 
D. Table data is automatically and continuously clustered, requiring minimal reorganization 
Answer: B

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