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NEW QUESTION: 1
Table1という名前のテーブルを含むDB1という名前のMicrosoftSQLServerデータベースがあります。
User1という名前のユーザーのデータベースロールメンバーシップを次の展示に示します。
ドロップダウンメニューを使用して、図に示されている情報に基づいて各ステートメントを完了する回答の選択肢を選択します。
注：正しい選択はそれぞれ1ポイントの価値があります。
Answer:
Explanation:
Explanation:
Box 1: delete a row from Table1
Members of the db_datawriter fixed database role can add, delete, or change data in all user tables.
Box 2: db_datareader
Members of the db_datareader fixed database role can read all data from all user tables.
Reference:
https://docs.microsoft.com/en-us/sql/relational-databases/security/authentication-access/database-level-roles
NEW QUESTION: 2
You want to capture column group usage and gather extended statistics for better cardinality estimates for
the customers table in the SH schema.
Examine the following steps:
1. Issue the SELECTDBMS_STATS. CREATE_EXTENDED_STATS('SH', 'CUSTOMERS')from dual
statement.
2.Execute the dbms_stats.seed_col_usage (null,'SH',500) procedure.
3.Execute the required queries on the customers table.
4.Issue the select dbms_stats.reportwcol_usage('SH', 'customers') from dual statement.
Identify the correct sequence of steps.
A. 2, 3, 4, 1
B. 3, 2, 1, 4
C. 4, 1, 3, 2
D. 3, 2, 4, 1
Answer: A
Explanation:
Explanation/Reference:
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: 3
C # 응용 프로그램을 개발 중입니다.
이름 위젯 클래스를 만듭니다.
일부 타사 라이브러리를 사용하며, 그 중 하나에는 이름 위젯 클래스가 포함되어 있습니다.
코드에서 Widget 클래스를 사용하면 모호함이 없어야 합니다.
이 요구 사항을 처리하기 위해 어떤 C # 키워드를 사용해야 합니까?
A. 대표자
B. 재정의
C. 네임 스페이스
D. 클래스
Answer: C