SAP C_HANADEV_18 Exam With Confidence Using Practice Dumps

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

OData is a protocol for exposing and consuming data over the web using RESTful APIs. OData supports various capacities, such as query options, operations, and annotations, to enable flexible and powerful data access and manipulation. SAP HANA extended application services, advanced model (XSA) is a framework for developing and deploying cloud-native applications on SAP HANA. XSA supports OData v4 as one of the service types that can be defined and exposed by the SAP Cloud Application Programming Model (CAP). XSA supports the following OData capacities in CAP:

• Aggregation: This capacity allows you to perform aggregation functions, such as sum, count, min, max, and average, on the data returned by an OData service. You can use the $apply query option to specify the aggregation expressions and groupings. XSA supports the OData Aggregation Extension for applying aggregations on entity sets and collections.
• Join: This capacity allows you to perform join operations on the data returned by an OData service. You can use the $expand query option to include related entities or properties in the response. XSA supports the OData Association and Navigation concepts for defining and accessing the relationships between entities.
• Association: This capacity allows you to define and use associations between entities in an OData service. Associations are semantic links that describe the cardinality and referential constraints of the relationships. You can use the OData Association and Referential Constraint annotations to specify the association details in the service definition or the metadata document.

The other options are not correct because:

• A. Union: This capacity is not supported by OData or XSA. Union is a set operation that combines the results of two or more queries into a single result set. OData does not provide a query option or an extension for performing union operations on the data returned by an OData service.
• D. Projection: This capacity is supported by OData, but not by XSA. Projection is a query option that allows you to select a subset of properties or entities from an OData service. You can use the $select query option to specify the properties or entities you want to include in the response. However, XSA does not support the $select query option in CAP, as it relies on the projection capabilities of the underlying data source, such as SAP HANA or PostgreSQL.

References:

• SAP Cloud Application Programming Model, OData v4 Support
• SAP Cloud Application Programming Model, Annotations
• OData Version 4.0 Part 1: Protocol
• OData Version 4.0 Part 2: URL Conventions
• OData Aggregation Extension for Data Services Version 4.0

 The SAP HANA system views that contain information about the object ownership are SCHEMAS and ROLES. The SCHEMAS view provides information about the schemas in the database, including the owner of each schema1. The ROLES view provides information about the roles in the database, including the owner of each role2. The object ownership indicates who has the right to grant or revoke privileges on the object, or to alter or drop the object3.

The other two options, TABLES and OBJECTS, do not contain information about the object ownership. The TABLES view provides information about the tables in the database, but not the owner of each table4. The OBJECTS view provides information about the objects in the database, such as views, procedures, functions, etc., but not the owner of each object5. References: 1: SCHEMAS System View | SAP Help Portal 2: ROLES System View | SAP Help Portal 3: Object Ownership | SAP Help Portal 4: TABLES System View | SAP Help Portal 5: OBJECTS System View | SAP Help Portal