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NEW QUESTION: 1
列グループの使用をキャプチャして、SHスキーマのCUSTOMERS表のより良い基数の見積もりのために拡張された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.SELECT DBMS_STATS.CREATE_EXTENDED_STATS ('SH', 'CUSTOMERS')
FROMデュアルステートメントを発行します。
2.DBMS_STATS.SEED_COL_USAGE（null、'SH'、500）の手順を実行します。
3.CUSTOMERS表に必要なクエリーを実行します。
4.SELECT DBMS_STATS.REPORT_COL_USAGE ('SH', 'CUSTOMERS') FROMデュアルステートメントを発行します。
正しい手順を識別してください。
A. 3, 2, 1, 4
B. 4, 1, 3, 2
C. 3, 2, 4, 1
D. 2, 3, 4, 1
Answer: D
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 statisticsHere 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
A customer had purchased an Equallogic iSCSI storage solution prior to the acquisition by Dell and has decided to evaluate solutions from other vendors. Which HP solution would be the best choice?
A. HPStorageWorks 2000sa G2 Modular Smart Array
B. HPStorageWorks P4000 SAN
C. HPStorageWorks D2000
D. HPStorageWorks 4400 Enterprise Virtual Array
Answer: B
NEW QUESTION: 3
A link that executes an action defined by a controller, and then either refreshes the current page, or navigates to a different page based on the PageReference variable that is returned by theaction. An <apex:commandLink> component must always be a child of an <apex:form> component.
To add request parameters to an <apex:commandLink>, use nested <apex:param> components.
A. apex:dataList
B. apex:commandLink
C. apex:enhancedList
D. apex:include
Answer: B
NEW QUESTION: 4
You create a default Flashback Data Archive FLA1and enable it for the EMPLOYEES table in the HR schema.
After a few days, you want to alter the EMPLOYEES table by executing the command:
SQL> ALTER TABLE EMPLOYEES ADD PHONE NUMBER(12);
Which statement is true about the execution of the command?
A. It executes successfully and continues to store metadata related to the EMPLOYEES table.
B. It executes successfully and all metadata related to the EMPLOYEES table before altering the table definition is purged from Flashback Data Archive.
C. It gives an error because DDL statements cannot be executed on a table that is enabled for Flashback Data Archive.
D. It executes successfully but Flashback Data Archive is disabled for the EMPLOYEES table.
Answer: A
Explanation:
Explanation/Reference:
Explanation:
Flashback data archives retain historical data across data definition language (DDL) changes to the database as long as the DDL change does not affect the structure of the table. The one exception to this rule is that flashback data archives do retain historical data when a column is added to the table.
https://docs.oracle.com/cd/B28359_01/server.111/b28286/statements_5009.htm