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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

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