You need to view the data model exposed by an OData V2 service. What must you append to the service URL? Please choose the correct answer.
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.Reference:
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
Which application runtimes are currently supported by the SAP Cloud Application Programming Model? There are 2 correct answers to this question.
The SAP Cloud Application Programming Model (CAP) is a framework for developing cloud-native applications based on open standards and best practices. The CAP supports two application runtimes: Node.js and Java. These runtimes provide the core services and libraries for building and running CAP applications, such as data access, authentication, authorization, localization, logging, and testing. The CAP also supports different database technologies, such as SAP HANA, PostgreSQL, and SQLite, and different deployment options, such as SAP Business Technology Platform, SAP HANA Cloud, or Kubernetes. The other options are not correct because:
A) Go is not a supported application runtime by the CAP. Go is a programming language that can be used to develop cloud-native applications, but it is not part of the CAP framework.
C) Python is not a supported application runtime by the CAP. Python is a programming language that can be used to develop cloud-native applications, but it is not part of the CAP framework.
SAP Cloud Application Programming Model, Overview
You need to install SAP HANA 2.0, express edition to develop a native SAP HANA application. Which of the following deployment options do you have?
There are 2 correct answers to this question.
SAP HANA 2.0, express edition is a streamlined version of SAP HANA that can run on laptops and other resource-constrained hosts. It supports native SAP HANA application development and can be installed on Linux OS or used as a virtual machine on Microsoft Windows. Installation on Windows Server or Mac OS is not supported by SAP HANA 2.0, express edition.Reference:
SAP HANA 2.0 SPS06 - Application Development for SAP HANA1, Section 1.1, p. 5
SAP HANA, express edition - Installation Guide, Section 1.1, p. 7
SAP HANA, express edition - FAQ, Question 1
A Node.js module is executed for the first time in SAP HANA extended application services, advanced model (XS advanced). Which of the following activities are performed automatically? There are 2 correct answers to this question.
A new SAP HANA Deployment Infrastructure (HDI) container is created: An HDI container is a logical database schema that contains the database objects and data that are required by the Node.js module. An HDI container is created based on the configuration and definition files of the Node.js module, such as the package.json, the mta.yaml, and the hdi-config.json. The HDI container is bound to the Node.js module as a service, and it can be accessed using the HDI client library or the SQL client library.
The required modules are downloaded based on module dependencies: The Node.js module may depend on other modules or libraries that provide additional functionality or services, such as express, hdb, or passport. These dependencies are specified in the package.json file of the Node.js module, and they are downloaded and installed automatically from the npm registry or the SAP npm registry when the Node.js module is executed for the first time.
The other options are not correct because they are not activities that are performed automatically when a Node.js module is executed for the first time in XS advanced. The source code is not compiled to create an executable binary file, but rather interpreted and executed by the Node.js runtime environment. A new service is not executed on the application server, but rather the existing Node.js module is executed as a service on the application server.Reference:
What are the main SAP HANA engines responsible for executing calculation views? There are 3 correct answers to this question.
Calculation views are a type of virtual data models that allow you to define complex calculations and aggregations on data from various sources, such as tables, views, or other calculation views. Calculation views are executed by different SAP HANA engines, depending on the type and complexity of the calculation view and the query that is submitted to it. The main SAP HANA engines responsible for executing calculation views are:
OLAP Engine: This engine is responsible for executing analytical queries on calculation views that are based on the star schema, which consists of a central fact table and multiple dimension tables. The OLAP engine supports multidimensional analysis, such as slicing, dicing, filtering, sorting, ranking, and drill-down operations. The OLAP engine also optimizes the query execution by applying techniques such as push-down, pruning, and caching.
Calculation Engine: This engine is responsible for executing complex calculations and transformations on calculation views that are based on the graph model, which consists of nodes and edges that represent data sources and operations. The calculation engine supports advanced features, such as hierarchies, unions, projections, aggregations, joins, and scripting. The calculation engine also leverages the parallel processing capabilities of SAP HANA to optimize the performance of data-intensive operations.
Join Engine: This engine is responsible for executing join operations on calculation views that involve multiple data sources. The join engine supports different types of joins, such as inner join, left outer join, right outer join, full outer join, referential join, and text join. The join engine also applies various join algorithms, such as hash join, nested loop join, and merge join, depending on the characteristics of the data sources and the join conditions.
The other options are not correct because:
A) Java Engine: This engine is not responsible for executing calculation views, but for executing Java applications that run on the SAP HANA XS Advanced Model. The Java engine provides the core services and libraries for building and running Java applications, such as data access, authentication, authorization, localization, logging, and testing.
B) XS Engine: This engine is not responsible for executing calculation views, but for executing XSJS and XSODATA applications that run on the SAP HANA XS Classic Model. The XS engine provides the runtime environment and the web server for executing XSJS and XSODATA applications, which can access SAP HANA database features using JavaScript syntax.
SAP HANA Developer Guide for SAP HANA Web IDE, Chapter 6, Section 6.1
SAP HANA Developer Guide for SAP HANA Web IDE, Chapter 6, Section 6.2
SAP HANA Developer Guide for SAP HANA Web IDE, Chapter 6, Section 6.3
SAP HANA Developer Guide for SAP HANA Web IDE, Chapter 6, Section 6.4
