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NEW QUESTION: 1
You work as a DBA and you have the responsibility of managing a large online transaction processing (OLTP) system. You used the following query during the performance tuning activity:
SQL> SELECT (1-((phy.value-phyd.value) / (cur.value + con.value))) * 100
2 "Cache Hit ratio"
3 FROM v$sysstat cur, v$sysstat con, v$sysstat phy, v$sysstat phyd
4 WHERE cur.name = 'db block gets'
5 AND con.name = 'consistent gets'
6 AND phy.name = 'physical reads'
7 AND phyd.name = 'physical reads direct';
Cache Hit Ratio
---------------
98.43
Which understanding of this ratio is correct?
A. 98.43% of times the requests have found the required data blocks in the buffer cache.
B. 98.43% of times the requests have found free buffers.
C. 98.43% of times the requests were satisfied by performing physical I/Os.
D. 98.43% of the total number of requests used the buffer cache.
Answer: A
NEW QUESTION: 2
Examine the Exhibit to view the structure of and indexes for the EMPLOYEES and DEPARTMENTS tables:
EXAMINE the SQL statement and its execution plan:
Which two statements are correct regarding the execution plan?
A. The performance of the query can be improved by creating bitmap index on the JOB_ID column of the EMPLOYEES table.
B. Step 1 is performing nested loop operation on the DEPARTMENT_ID column of the DEPARTMENTS table, which is the driven table and results returned by step 2 in the driving resultset.
C. Step 2 is performing nested operation on JOB_ID column of the JOBS table, which is the driven table and the EMPLOYEES table is the driven table.
D. In step 2 for every row returned by the JOBS table matching rows from the EMPLOYEES table are accessed.
E. The performance of the query can be improved by creating bitmapped index on the DEPARTMENT_ID column of the EMPLOYEES table.
Answer: D,E
Explanation:
As per exhibit:
B, not A, Not C: First is line 5 executed, followed by line 4, followed by line 3.
Step 2 is line 4.
E: The Department_ID column has lower cardinality compared to the JOB_ID column, so it is better suited for a bitmapped index.
Note:
*Oracle bitmap indexes are very different from standard b-tree indexes. In bitmap structures, a two-dimensional array is created with one column for every row in the table being indexed. Each column represents a distinct value within the bitmapped index. This two-dimensional array represents each value within the index multiplied by the number of rows in the table.
At row retrieval time, Oracle decompresses the bitmap into the RAM data buffers so it can be rapidly scanned for matching values. These matching values are delivered to Oracle in the form of a Row-ID list, and these Row-ID values may directly access the required information.
*The real benefit of bitmapped indexing occurs when one table includes multiple bitmapped indexes. Each individual column may have low cardinality. The creation of multiple bitmapped indexes provides a very powerful method for rapidly answering difficult SQL queries.
*Oracle bitmap indexes are very different from standard b-tree indexes. In bitmap structures, a two-dimensional array is created with one column for every row in the table being indexed. Each column represents a distinct value within the bitmapped index. This two-dimensional array represents each value within the index multiplied by the number of rows in the table.
At row retrieval time, Oracle decompresses the bitmap into the RAM data buffers so it can be rapidly scanned for matching values. These matching values are delivered to Oracle in the form of a Row-ID list, and these Row-ID values may directly access the required information.
NEW QUESTION: 3
エンドユーザーがITスペシャリストに新しいソフトウェアをワークステーションにインストールするように要求を送信します。ワークステーションの仕様は次のとおりです。
新しいアプリケーションの最小ソフトウェア要件はデュアルコアです。 4GBのRAMと60GBのストレージを備えた64-btt OSソフトウェアをインストールしようとすると、技術者は次のどの状況に遭遇しますか？
A. RAMが不足しています
B. 不十分なストレージ
C. ネットワーク帯域幅が不十分
D. 互換性のないプロセッサー
E. 互換性のないシステムアーキテクチャ
Answer: B
NEW QUESTION: 4
An administrator is configuring IBM FileNet Content Federation Services for Image Services (CFS-IS). Which object in the Content Engine configuration contains the details of the external repository (e.g. IS username, password, domain and organization name)?
A. Replication group
B. External repository
C. Fixed storage area
D. Fixed content device
Answer: D