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NEW QUESTION: 1
列グループの使用状況を取得し、SHschemaの顧客テーブルのより良い基数予想の拡張統計情報を収集したいと思います。
次の手順を確認します:
1.デュアル声明からSELECTDBMS_STATS. CREATE_EXTENDED_STATS('SH','CUSTOMERS')を発行します。
2.dbms_stats.seed_col_usage (null,'SH',500)プロシージャを実行します。
3.顧客テーブルで必要なクエリーを実行します。
4.デュアル声明から選択dbms_stats.reportwcol_usage('SH', 'customers')を発行します。
正しい手順を識別してください。
A. 2, 3, 4, 1
B. 3, 2, 1, 4
C. 4, 1, 3, 2
D. 3, 2, 4, 1
Answer: A
Explanation:
Explanation
Step 1 (2). Seed column usage
Oracle must observe a representative workload, in order to determine the appropriate column groups. Using the new procedure DBMS_STATS.SEED_COL_USAGE, you tell Oracle how long it should observe the workload.
Step 2: (3) You don't need to execute all of the queries in your work during this window. You can simply run explain plan for some of your longer running queries to ensure column group information is recorded for these queries.
Step 3. (1) Create the column groups
At this point you can get Oracle to automatically create the column groups for each of the tables based on the usage information captured during the monitoring window. You simply have to call the DBMS_STATS.CREATE_EXTENDED_STATS function for each table.This function requires just two arguments, the schema name and the table name. From then on, statistics will be maintained for each column group whenever statistics are gathered on the table.
Note:
* DBMS_STATS.REPORT_COL_USAGE reports column usage information and records all the SQL operations the database has processed for a given object.
* The Oracle SQL optimizer has always been ignorant of the implied relationships between data columns within the same table. While the optimizer has traditionally analyzed the distribution of values within a column, he does not collect value-based relationships between columns.
* Creating extended statistics
Here are the steps to create extended statistics for related table columns withdbms_stats.created_extended_stats:
1 - The first step is to create column histograms for the related columns.
2 - Next, we run dbms_stats.create_extended_stats to relate the columns together.
Unlike a traditional procedure that is invoked via an execute ("exec") statement, Oracle extended statistics are created via a select statement.
NEW QUESTION: 2
スイッチポートでDTPを無効にするにはどうすればよいですか？
A. 管理モードをアクセスに変更します
B. チャネルグループにスイッチのインターフェイスを追加します
C. 動作モードを静的アクセスに変更します
D. スイッチポートをトランクとして構成します
Answer: A
NEW QUESTION: 3
A user has launched an EC2 instance from an instance store backed AMI. If the user restarts the instance, what will happen to the ephermal storage data?
A. All data will be erased and the ephermal storage is released
B. It is not possible to restart an instance launched from an instance store backed AMI
C. The data is preserved
D. All the data will be erased but the ephermal storage will stay connected
Answer: C
Explanation:
Explanation
A user can reboot an EC2 instance using the AWS console, the Amazon EC2 CLI or the Amazon EC2 API.
Rebooting an instance is equivalent to rebooting an operating system. However, it is recommended that the user use Amazon EC2 to reboot the instance instead of running the operating system reboot command from the instance. When an instance launched from an instance store backed AMI is rebooted all the ephermal storage data is still preserved.
NEW QUESTION: 4
One of your disks is almost full, so you decide to look for files that can be removed. Looking around the file system, you find a directory with this content:
How much disk space can you reclaim by removing these files?
A. 4, 294, 967, 296 bytes
B. 17, 179, 869, 184 bytes
C. 33, 570, 624 bytes
D. 0 bytes
Answer: D