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Question ID 2147

You notice a performance change in your production Oracle 12c database. You want to know which change caused this performance difference.
Which method or feature should you use?
 

Option A

A.    Compare Period ADDM report
 

Option B

B.    AWR Compare Period report
 

Option C

C.    Active Session History (ASH) report

 

Option D

D.    Taking a new snapshot and comparing it with a preserved snapshot

Correct Answer B
Explanation


Question ID 2148

You want to capture column group usage and gather extended statistics for better cardinality estimates for the CUSTOMERS table in the SH schema.
Examine the following steps:
1.    Issue the SELECT DBMS_STATS.CREATE_EXTENDED_STATS (‘SH’, ‘CUSTOMERS’) FROM dual statement.
2.    Execute the DBMS_STATS.SEED_COL_USAGE (null, ‘SH’, 500) procedure.
3.    Execute the required queries on the CUSTOMERS table.
4.    Issue the SELECT DBMS_STATS.REPORT_COL_USAGE (‘SH’, ‘CUSTOMERS’) FROM dual statement.
Identify the correct sequence of steps.
 

Option A

A.    3, 2, 1, 4
 

Option B

B.    2, 3, 4, 1
 

Option C

C.    4, 1, 3, 2
 

 

Option D

D. 3, 2, 4, 1

Correct Answer B
Explanation

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