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NEW QUESTION: 1
Which parameter would you tune to affect the selection of a static route as a backup, when a dynamic protocol is also being used?
A. link cost
B. administrative distance
C. hop count
D. link delay
E. link bandwidth
Answer: B
Explanation:
What Is Administrative Distance?
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094195.shtml
Administrative distance is the feature that routers use in order to select the best path. Administrative distance defines the reliability of a routing protocol. Each routing protocol is prioritized in order of most to least reliable (believable) with the help of an administrative distance value. Lowest Administrative distance will be chosen first.

NEW QUESTION: 2
マルチテナント・アーキテクチャーに関する3つのステートメントは本当ですか？（3つ選択してください）
A. PDB.sは共通のシステム表スペースを共有します。
B. PDBはsysauxテーブルスペースを共有できます。
C. 異なるPDBは異なるデフォルトブロックサイズを持つことができます。
D. インスタンスリカバリは、常にCDBレベルで実行されます。
E. PDBはプライベート・テンポラリ・テーブルスペースを持つことができます。
F. ログスイッチは、マルチテナントコンテナデータベース（CDB）レベルでのみ発生します。
G. 各プラッガブルデータベース（PDB）には独自の一連のバックグラウンドプロセスがあります。
Answer: D,E,F
Explanation:
B:
* A PDB would have its SYSTEM, SYSAUX, TEMP tablespaces. It can also contains other user created tablespaces in it.
* There is one default temporary tablespace for the entire CDB. However, you can create additional temporary tablespaces in individual PDBs.
D:
* There is a single redo log and a single control file for an entire CDB
* A log switch is the point at which the database stops writing to one redo log file and begins writing to another. Normally, a log switch occurs when the current redo log file is completely filled and writing must continue to the next redo log file.
G: instance recovery
The automatic application of redo log records to uncommitted data blocks when an database instance is restarted after a failure.
Incorrect:
Not A:
* There is one set of background processes shared by the root and all PDBs.
* High consolidation density. The many pluggable databases in a single container database share its memory and background processes, letting you operate many more pluggable databases on a particular platform than you can single databases that use the old architecture.
Not C: There is a separate SYSAUX tablespace for the root and for each PDB.
Not F: There is a separate SYSTEM tablespace for the root and for each PDB.

NEW QUESTION: 3
組織は、オンサイトアプリケーションサーバーを、複数の顧客が共有する仮想化環境を運用するサービスプロバイダーに移行しています。組織にとって最も重要なリスクは次のうちどれですか？
A. 監査する権利を制限するサービスプロバイダー
B. 他のクライアントからのアカウントハッキング
C. サービスプロバイダーによる組織データへのアクセス
D. 他のクライアントからの競合するワークロード
Answer: D

NEW QUESTION: 4
Identify two situations in which full table scans will be faster than index range scans.
A. A query on a table with sparsely populated table blocks.
B. A query executing in parallel on a partitioned table with partitioned indexes.
C. A highly selective query on a table having high clustering factor for an index.
D. A query fetching less number of blocks than value specified by DB_FILE_MULTIBLOCK_READ_COUNT.
E. A query with a highly selective filter fetching less than 5 percent of the rows from a table.
Answer: B,D
Explanation:
D: DB_FILE_MULTIBLOCK_READ_COUNT is one of the parameters you can use to minimize I/O during table scans. It specifies the maximum number of blocks read in one I/O operation during a sequential scan. The total number of I/Os needed to perform a full table scan depends on such factors as the size of the table, the multiblock read count, and whether parallel execution is being utilized for the operation.
Online transaction processing (OLTP) and batch environments typically have values in the range of 4 to 16 for this parameter. DSS and data warehouse environments tend to benefit most from maximizing the value of this parameter. The optimizer is more likely to choose a full table scan over an index if the value of this parameter is high.
Note:
* See 6) and 7) below.
The oracle optimizer choose the best plan and execute the query according the plan. It is
common to hear that my table has indexes but why oracle does not use indexes rather it is
using full table scan. There are several reasons behind choosing optimizer full table scans.
1)The table has no indexes within it.
2)Table has indexes but they are not appropriate to queries. For example in the table there is normal B-tree indexes but in the query the column used in the WHERE clause contains function. 3)Query access large amount of data. The table has indexes but query against it select almost all of the rows. In that case optimizer might choose to full access of table.
4)Index creation order may not appropriate. You have composite indexes on a table but in the where clause the leading column inside indexes are not used rather trailing columns are used. 5)The table is skewed. For example column gender contains value 'M' 10,000 times but value 'F' only 10 times.6)The table is small. If a table can read in a single I/O call, then a full table scan might be cheaper than an index range scan. Single I/O call is defined by DB_FILE_MULTIBLOCK_READ_COUNT parameter and value defined by blocks.Check it by,SQL> show parameter DB_FILE_MULTIBLOCK_READ_COUNTNAME TYPE VALUE-
db_file_multiblock_read_count integer 16
7)High degree of parallelism. High degree of parallelism skews the optimizer toward full table scans.
8)In the query if there is no filtering then full table scan is the choice.
*If an index has poor cardinality (ie. more than 4% rows with the same index key) then it
will perform poorly. It will usually be faster to perform a full table scan. eg. Table SALES
has an index on the column PAYMENT_METHOD which can contain values such as COD,
CREDIT, CHEQUE, CASH. The statement
SELECT *
FROM sales
WHERE payment_method = 'CASH'
will probably perform so badly that you are better off without the index.
*Oracle uses the full table scan as it assumes that it will have to read a certain part of the
table.
Reference: Oracle Database Reference, DB_FILE_MULTIBLOCK_READ_COUNT