C_HANADEV_18 Exam Dumps - SAP Certified Development Associate - SAP HANA 2.0 SPS06

The mta.xml file is the main descriptor file for a multi-target application (MTA). It defines the application global elements, such as ID, version, provider, and schema version. It also defines the modules, which are the components of the application that provide specific functionality, such as a database module, a Node.js module, or an HTML5 module. Each module has a name, a type, a path, and a list of required dependencies. The mta.xml file also defines the resources, which are the shared services or configurations that the modules can consume, such as a user-provided service, an SAP HANA database, or an SAP HANA HDI container. Each resource has a name, a type, and optional parameters. The mta.xml file also defines the properties and parameters, which are the key-value pairs that can be used to configure the modules and resources, such as the host, port, or credentials. The properties and parameters can be defined globally, per module, or per resource12.

The other options are not correct because they are not part of the mta.xml file, but rather of other files or components of the MTA. The plugin name and version for every supported file suffix are defined in the .che file, which is the configuration file for the SAP Web IDE3. The application router description with the authentication methods and access routes are defined in the xs-app.json file, which is the configuration file for the application router, a Node.js module that provides a single entry point and routing mechanism for the MTA. The Node.js package definition with dependencies and initial run configurations are defined in the package.json file, which is the configuration file for the Node.js module that contains the application logic and business services. References:

• SAP HANA Platform, Developing Applications with SAP HANA Cloud Platform, Developing Multi-Target Applications
• SAP HANA Platform, SAP HANA Extended Application Services, Advanced Model, Developing and Deploying Applications, Descriptor Files, mta.xml
• SAP HANA Platform, Developing Applications with SAP HANA Cloud Platform, Developing Multi-Target Applications, Descriptor Files, .che
• [SAP HANA Platform], SAP HANA Extended Application Services, Advanced Model, Developing and Deploying Applications, Descriptor Files, xs-app.json
• [SAP HANA Platform], SAP HANA Extended Application Services, Advanced Model, Developing and Deploying Applications, Descriptor Files, package.json

OData associations are used to define the relationships between two or more entity types in an OData service. Associations can be simple or complex, depending on whether the relationship information is stored in one of the participating entities or in a separate association table. Associations are composed of two ends, each of which has a role name, a multiplicity, and a set of properties that form the referential constraint. The keywords that are used to define an OData association are:

• DEPENDENT: This keyword is used to specify the role name of the dependent end of the association, which is the entity type that contains the foreign key properties that refer to the principal entity type. For example, in the association Customer_Orders, the entity type Orders is the dependent end, as it contains the property CustomerID that refers to the entity type Customers.
• MULTIPLICITY: This keyword is used to specify the cardinality of each end of the association, which indicates how many instances of one entity type can be related to one instance of another entity type. The possible values for multiplicity are: 0…1 (zero or one), 1 (exactly one), or * (many). For example, in the association Customer_Orders, the multiplicity of the principal end Customers is 1, meaning that each customer can have only one instance, and the multiplicity of the dependent end Orders is *, meaning that each customer can have many orders.
• PRINCIPAL: This keyword is used to specify the role name of the principal end of the association, which is the entity type that is referenced by the foreign key properties of the dependent entity type. For example, in the association Customer_Orders, the entity type Customers is the principal end, as it is referenced by the property CustomerID of the entity type Orders.

The following keywords are not used to define an OData association, but for other purposes:

• JOIN: This keyword is used to specify the join condition between two entity sets in a query expression, which is used to retrieve data from multiple sources. For example, the query expression Customers?$expand=Orders($filter=Status eq ‘Open’) uses a join condition to filter the orders that have the status ‘Open’ for each customer.
• UNION: This keyword is used to specify the union operation between two query expressions, which is used to combine the results of both queries into one result set. For example, the query expression Customers?$filter=Country eq ‘US’ union Customers?$filter=Country eq ‘CA’ uses a union operation to get the customers that are from either the US or Canada.

An OData service is a web service that exposes data from a data source, such as a SAP HANA database, in a standardized and interoperable format. An OData service consists of one or more entity sets, which are collections of entities of the same type. An entity is a data object that has properties and a unique key. An OData service can also define associations between entity sets, which are relationships that specify how entities are related to each other. For example, an association can define a one-to-many or a many-to-many relationship between two entity sets. Associations enable an OData service to combine data from different database tables within the same service. For example, an OData service can define an association between a Products entity set and a Categories entity set, where each product belongs to one category and each category can have multiple products. This association can be used to query or update data from both entity sets in a single request.

The other options are incorrect because they are not capabilities that can be used to combine data from different database tables within an OData service. Aggregations are operations that summarize or group data, such as count, sum, average, or min/max. Projections are operations that select or filter data, such as select, expand, or filter. Entity sets are collections of entities of the same type, but they do not define relationships between entities. References:

• SAP HANA Platform 2.0 SPS06: OData V4 Developer Guide, Section 2.1
• SAP HANA Platform 2.0 SPS06: OData V4 Developer Guide, Section 2.3
• SAP HANA Platform 2.0 SPS06: OData V4 Developer Guide, Section 2.4
• SAP HANA Platform 2.0 SPS06: OData V4 Developer Guide, Section 2.5
• SAP HANA Platform 2.0 SPS06: OData V4 Developer Guide, Section 2.6

An OData V2 service is a web service that exposes data from a data source, such as a SAP HANA database, in a standardized and interoperable format based on the OData protocol version 2.0. An OData V2 service consists of one or more entity sets, which are collections of entities of the same type. An entity is a data object that has properties and a unique key. An OData V2 service can also define associations between entity sets, which are relationships that specify how entities are related to each other. An OData V2 service can also define function imports, which are operations that can be invoked by the client to perform specific tasks.

An OData V2 service exposes a data model that describes the structure and semantics of the data and the operations that are supported by the service. The data model is represented in an XML document that conforms to the OData Metadata XML Schema. The data model contains information such as the entity types, the entity sets, the associations, the function imports, the namespaces, the annotations, and the service document.

To view the data model exposed by an OData V2 service, you need to append the $metadata system query option to the service URL. The $metadata system query option requests the metadata document of the service. For example, if the service URL is http://services.odata.org/V2/Northwind/Northwind.svc, then the metadata document URL is http://services.odata.org/V2/Northwind/Northwind.svc/$metadata. The metadata document URL can be accessed by any HTTP client, such as a web browser, and it returns the XML representation of the data model.

The other options are incorrect because they are not system query options that can be used to view the data model exposed by an OData V2 service. $schema is not a valid system query option in OData V2. $service definition is a system query option in OData V4, not OData V2, and it requests the service definition document, which is a JSON document that describes the capabilities and annotations of the service. $format is a system query option that can be used to specify the desired format of the response, such as XML or JSON, but it does not request the data model of the service. References:

• SAP HANA Platform 2.0 SPS06: OData V2 Developer Guide, Section 1.1
• SAP HANA Platform 2.0 SPS06: OData V2 Developer Guide, Section 2.1
• SAP HANA Platform 2.0 SPS06: OData V2 Developer Guide, Section 2.6
• OData Version 2.0: Part 1 - Protocol, Section 2.2.6
• OData Version 2.0: Part 3 - CSDL, Section 1