You executed the following procedure to collect statistics regarding an index：       SQL>ANALYZE INDEX EMP_ID VALIDATE STRUCTURE；  
Which view will you use to determine whether you need to rebuild the index or not？（） 

A. The database will hang.
B. The database will be crashed.
C. The database will be shut down.
D. The LGWR process writes redo log entries to the other redo log member of the Group2 group

A. Hash cluster
B. Index cluster
C. Sorted hash cluster
D. Real Application cluster

A. column sizes
B. column data types
C. PCTFREE
D. projected number of row
E. PCTUSED