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  Aug 3

  NCR Teradata认证nr0-012考试题库介绍

  考试代号: nr0-012
  问题数量:112 Q&As
  
  更新时间: 2009-08-31
  注册地点: Prometric/Pearson VUE
  题库全称:Teradata Physical Implementation v2r5 Exam

  免费nr0-012题库Demo赏析

  　
  　
  Exam : NCR Teradata NR0-012
  Title : Teradata Physical Implementation v2r5 Exam

  1. Which three statements are true about identity columns? (Choose three.)
  A.They are supported by TPump.
  B.They guarantee sequential numbering of inserted rows.
  C.They provide even row distribution when used as a primary index.
  D.They simplify the initial port from other databases that use generated keys.
  Answer: ACD

  2. During which phase of modeling design would a Partitioned Primary Index be defined?
  A.Logical Data Modeling
  B.Physical Data Modeling
  C.Entity-Relationship Modeling
  D.Business Information Modeling
  Answer: B

  3. What should be considered when electing to denormalize a table?
  A.volatility
  B.cardinality
  C.connectivity
  D.number of users
  Answer: A

  4. Which two definitions are required on the referenced columns when implementing Referential Integrity? (Choose two.)
  A.Unique
  B.Nullable
  C.Indexed
  D.Not Null
  Answer: AD

  5. Which property is a characteristic of a NUSI?
  A.two-AMP operation
  B.two tables with the same index
  C.physical grouping of related data
  D.index row and table row on same AMP
  Answer: D

  6. Click the Task Button.Place each normal form name next to its description.
  Answer:

  7. To avoid waiting on conflicting locks, which LOCKING modifier should be used?
  A.UNLOCK ROW
  B.LOCKING ROW NOWAIT
  C.OVERRIDE CURRENT LOCK
  D.LOCKING ROW FOR EXCLUSIVE
  Answer: B

  8. Which three join methods require spool files? (Choose three.)
  A.Merge Join
  B.Nested Join
  C.Product Join
  D.Exclusion Merge Join
  Answer: ACD

  9. Which two statements about parallel steps are true? (Choose two.)
  A.They are steps whose output may be used in a later statement.
  B.They are sequentially numbered steps that may execute simultaneously.
  C.They represent combined identical steps for two or more SQL statements within the request parcel.
  D.They are seen in the creation of a spool file, which is subsequently used in more than one processing step.
  Answer: AB

  10. Use of the SQL option:
  locking row nowait
  enables which action by the system?
  A.downgrade to an access lock
  B.immediate access to the row
  C.abort requesting task on a wait
  D.abort holding lock task on a wait
  Answer: C

  11. In a table with a Partitioned Primary Index, what characterizes primary index access?
  A.The partition value is hashed and the data row is retrieved directly.
  B.The primary index column values are hashed and the data row is retrieved directly.
  C.The partition value is hashed and each partition which hasn’t been eliminated in the predicate is scanned for the rowid.
  D.The primary index column values are hashed and each partition which hasn’t been eliminated in the predicate is scanned for the rowid.
  Answer: D

  12. Which two statements are true about identity columns? (Choose two.)
  A.Only one can be specified per table.
  B.They need not be a primary index column.
  C.They can be part of a composite primary index.
  D.They can be the primary index of a table with atomic upsert operations.
  Answer: AB

  13. Whenever you have stand-alone derived data, you must decide whether to calculate it or store it.
  On which two demographics should you base your decision? (Choose two.)
  A.access column
  B.access frequency
  C.column data value volatility
  D.number of sources involved
  Answer: BC

  14. Which statement is true of join indexes?
  A.They can be processed using MultiLoad.
  B.They can be used to define Full Outer Joins.
  C.They can be assigned a different primary index from the base table.
  D.They can be used on a table with triggers and Referential Integrity constraints.
  Answer: C

  15. Which two factors should be considered when electing to denormalize a table? (Choose two.)
  A.volatility
  B.cardinality
  C.connectivity
  D.performance
  Answer: AD

  16. What is an effect of denormalization on application coding?
  A.It usually increases data flexibility.
  B.It increases the cost of data retrieval.
  C.It generally reduces the potential for data problems.
  D.It generally makes new applications more difficult to implement.
  Answer: D

  17. What are three considerations when creating a primary index? (Choose three.)
  A.If third normal form, you must use a primary key.
  B.Duplicate values are not stored in the same block.
  C.Primary index values should not be subject to change.
  D.Columns frequently used for row selection are good candidates.
  E.Very non-unique values can cause premature "database full" conditions.
  Answer: CDE

  18. Which three are data demographic elements? (Choose three.)
  A.number of nulls
  B.number of constraints
  C.number of distinct values
  D.number of rows per value
  Answer: ACD

  19. A Partitioned Primary Index is an alternative for which index type?
  A.multi-table join index
  B.unique primary index
  C.non-unique primary index
  D.value-ordered secondary index
  Answer: D

  20. What happens to a submitted query when a deadlock occurs?
  A.Oldest query is aborted.
  B.Youngest query is aborted.
  C.Query waits for deadlock to resolve.
  D.Dispatcher identifies which query to hold and waits for completion of deadlocking query.
  Answer: B

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