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最新的 IBM Certified Database Administrator C2090-311 免費考試真題:

1. Which statement regarding NOT ENFORCED unique constraints is true?

A) NOT ENFORCED unique constraints enforce uniqueness only for primary key columns.
B) When attempting to insert data that does not conform to the NOT ENFORCED unique constraint, an error will be returned and the record will not be inserted.
C) Storage requirements for NOT ENFORCED unique constraints are identical to storage requirements for a unique index.
D) The query optimizer will consider a NOT ENFORCED unique constraint when selecting the optimal data access plan.

2. When can a high availability disaster recovery (HADR) role switch operation be performed in a DB2 pureScale environment?

A) When all the log streams are in peer or assisted remote catchup state.
B) When crash recovery is occurring on the standby cluster.
C) When the primary database is not connected to the standby database.
D) All the log streams are in remote catchup state and the synchronization mode is NEARASYNC.

3. An expression-based index named EMPJND1 and a statistical view named EMP_IND1_V have been created for a table named EMPLOYEE.
If the following command is used to set up a statistics profile on the statistical view EMP_IND1_V:
RUNSTATS ON VIEW emp_ind1_v WITH DISTRIBUTION DEFAULT UM_FREQVALUES 50 SET PROFILE ONLY
Which command will create a statistics profile on the EMPLOYEE table?

A) RUNSTATS ON TABLE employee USE SAMPLED INDEX emp_ind1
B) RUNSTATS ON TABLE employee WITH DISTRIBUTION AND SAMPLED INDEX emp_ind1 GENERATE PROFILE
C) RUNSTATS ON TABLE employee WITH DISTRIBUTION AND SAMPLED DETAILED INDEXES ALL
D) RUNSTATS ON TABLE employee USE PROFILE

問題與答案：