第45題-OCP最新題庫(kù)062認(rèn)證考試原題解析
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我要咨詢2018年的時(shí)候,OCP 11g考試題庫(kù)大更新,052 053出現(xiàn)了很多新題,
2019年,11g即將停考的前期,Oracle又出現(xiàn)了一次大變動(dòng),12c出現(xiàn)了很多新題,比如062 063題庫(kù)大更新
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QUESTION 45
You notice a high number of waits for t he db file scattered read and db file sequential read events in t he recent Automatic Database Diagnostic Monitor (ADDM) report. After further investigation, you f ind that queries are performing too many full table scans and indexes are not being used even though the filter columns are indexed.
Identify three possible reasons for this.
A. Missing or stale histogram statistics
B. Undersized shared pool
C. High clustering factor for the indexes
D. High value for the DB_FILE_MULTIBLOCK_READ_COUNT parameter
E. Oversized buffer cache
Correct Answer: ACD
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