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Exam 1z0-083 topic 1 question 148 discussion

Actual exam question from Oracle's 1z0-083
Question #: 148
Topic #: 1
[All 1z0-083 Questions]

Which two are true about Optimizer Statistics? (Choose two.)

  • A. They can be gathered by the DBMS_STATS package.
  • B. They are gathered by the SQL Tuning Advisor.
  • C. They provide real-time data about schema objects.
  • D. They are ignored by Optimizer if they are stale.
  • E. By default, they are automatically gathered by a maintenance job.
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Suggested Answer: AE 🗳️
by RinD at May 11, 2021, 8:36 a.m.

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RinD
Highly Voted 3 years, 7 months ago
AE correct
upvoted 13 times
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antonica
Most Recent 9 months ago
what happend with this parameter, OPTIMIZER_REAL_TIME_STATISTICS?
upvoted 1 times
antonica
9 months ago
Oracle Database 19c introduces real-time statistics, which extend online support to conventional DML statements. Because statistics can go stale between DBMS_STATS jobs, real-time statistics help the optimizer generate more optimal plans.
upvoted 1 times
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_gio_
1 year, 5 months ago
Selected Answer: AE
Sure of AE, Optimizer can use stale statistics this is why it's important to frequently analize them
upvoted 1 times
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ScottL
1 year, 8 months ago
Selected Answer: AE
AE Correct: https://docs.oracle.com/en/database/oracle/oracle-database/19/tgsql/optimizer-statistics-concepts.html#GUID-3ED2DA31-F61B-4E8F-9166-79FB01392B1D
upvoted 1 times
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flaviogcmelo
2 years, 8 months ago
Selected Answer: AE
Ref.: https://docs.oracle.com/en/database/oracle/oracle-database/19/tgsql/optimizer-statistics-concepts.html#GUID-3ED2DA31-F61B-4E8F-9166-79FB01392B1D
upvoted 3 times
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ObserverPL
3 years, 7 months ago
Agree, AE correct
upvoted 1 times
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C (25%)
B (20%)
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