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Oracle 1Z1-591認証試験では、データモデルの作成と管理、BIダッシュボードとレポートの開発、データを保護および管理するためのセキュリティポリシーの実装など、さまざまなトピックをカバーしています。この試験では、Oracle BIアーキテクチャ、Oracle Exalyticsの使用、Oracle BIのOracle Product Suiteの他の製品との統合に関する候補者の知識もテストしています。試験には複数選択の質問で構成されており、66％の合格スコアが必要です。
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質問 # 67
What are the two types of Session Variables?
正解：B、C
解説：
There are two types of session variables:
System - A session variable that the Oracle BI Server and Oracle BI Presentation Services use for specific purposes.
System session variables have reserved names that cannot be used for other kinds of variables (such as static or dynamic repository variables and non-system session variables).
Non-system - A system variable that the administrator creates and names. For example, the administrator might create a SalesRegion non-system variable that initializes the name of a user's sales region.
The administrator creates non-system session variables using the Oracle BI Administration Tool.
Note: Session Variables
A session variable is a variable that is initialized at login time for each user. When a user begins a session, the Oracle BI Server creates a new instance of a session variable and initializes it.
There are as many instances of a session variable as there are active sessions on the Oracle BI Server. Each instance of a session variable could be initialized to a different value.
質問 # 68
Which language is used by OBIEE to query Essbase?
正解：B
解説：
Explanation
The Essbase cube looks just like any other relational star schema in my Presentation Layer, however when it is queried Oracle BI Server will issue MDX queries against a multi-dimensional data source, rather than an SQL query against a relational star schema.
質問 # 69
An organization has its employees' names in an Employees table, and information about their jobs in a Jobs table.
However, an organization's employees can have multiple jobs, and the same job can be performed by multiple employees. This situation would result in a many to-many relationship between the Employees and Jobs tables. How can the many to-many relationship issue be resolved?
正解：B
解説：
Explanation
When you need to model many-to-many relationships between dimension tables and fact tables, you can create a bridge table that resides between the fact and the dimension tables. A bridge table stores multiple records corresponding to that dimension. In the Administration Tool, General tab in the Logical Table dialog box contains a check box that you can select to specify that a table is a bridge table.
A bridge table allows you to resolve many-to-many data relationships.
Reference; OBI Server Administration Server Guide, Version 10.1, Identifying Bridge Tables
質問 # 70
When adding a new dimension to an existing logical table, what is the significance of the Logical Level setting in the Logical Table Source properties?
正解：C
解説：
OBIEE - Grain (Level of summarization)
Grain definition in the context of OBIEE.
The following list describes the different grains in navigating a query:
*Aggregation grain. The grain of the aggregate source of from a level based metrics
*Query grain. The grain of the request.
*Time Series grain. The grain at which the time series function aggregation is requested.
*Storage grain. The query in the example can be computed from daily sales or from monthly sales, or from quarterly sales.
Note:
The aggregation grain is defined in the content tab of the logical table source.
When the query grain match the aggregation grain of a logical table source, this one is used to
create the physical query.
質問 # 71
If you have a database with four aggregate tables, how should the repository be configured to take advantage of the aggregates?
正解：C
解説：
Explanation/Reference:
Content Tab
Aggregation Content
You can define the aggregation (ie the group by) of:
by hierarchy level
by logical column
It helps you to define an aggregate navigation
Note: logical table source
Logical table sources define the mappings from a single logical table to one or more physical tables. A logicaltable contains one or more logical table source. The mapping between physical columns and logical columns are done in this element.
The definition of the logical table source is used:
to specify transformations/calculations (in the column mapping tab),
to enable aggregate navigation and fragmentation (in the content tab)
The Content tab of the Logical Table Source is used to define :
any aggregate table content definitions (specify the grain of the physical tables), fragmented table definitions for the source,
and WHERE clauses (if you want to limit the number of rows returned).
質問 # 72
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