SAP Updated C_HANADEV_18 Exam Questions and Answers by alexandru

The SAP Web IDE for SAP HANA is a web-based development tool that allows you to create and manage multi-target applications (MTAs) that use the SAP HANA Deployment Infrastructure (HDI). HDI is a service layer that enables you to deploy database development artifacts to HDI containers, which are isolated schemas that represent runtime objects. Some of the operations that you can perform in the SAP Web IDE for SAP HANA are:

• Deploy HTML5 modules to the SAP HANA database: HTML5 modules are web applications that run on the XS advanced runtime and can access HDI containers via service bindings. You can create, edit, test, and deploy HTML5 modules from the SAP Web IDE for SAP HANA using the MTA development perspective and the build and run commands. You can also use the HTML5 module template wizard to generate a basic HTML5 module with the required configuration files and dependencies.
• Configure the artifact namespaces: Artifact namespaces are prefixes that are added to the names of the database artifacts that are deployed to the HDI containers. They help to avoid name conflicts and to organize the artifacts in a logical way. You can configure the artifact namespaces in the SAP Web IDE for SAP HANA by editing the .hdiconfig file in the db module of your MTA project. You can also use the namespace template wizard to generate a .hdiconfig file with a default namespace.

The following operations are not possible or not recommended in the SAP Web IDE for SAP HANA:

• Create objects in the SAP HANA repository: The SAP HANA repository is a legacy feature that was used to store and manage design-time artifacts in SAP HANA 1.0. It has been deprecated since SAP HANA 2.0 SPS 02 and replaced by HDI. Therefore, you should not create objects in the SAP HANA repository, but rather use HDI containers and the SAP Web IDE for SAP HANA to develop and deploy database artifacts.
• Choose the supported SAP HANA versions: The SAP Web IDE for SAP HANA does not allow you to choose the supported SAP HANA versions for your MTA project. The supported SAP HANA versions depend on the HDI version and the SAP HANA Cloud Platform, which are determined by the target environment where you deploy your MTA project. You can check the compatibility of the HDI version and the SAP HANA Cloud Platform in the SAP HANA Deployment Infrastructure Reference.

References:

• [SAP HANA Deployment Infrastructure Reference], Chapter 5: HDI with XS Advanced, Section 5.1: Developing with the SAP Web IDE for SAP HANA, pp. 101-106.
• [SAP HANA Platform Documentation], SAP HANA Developer Guide for SAP HANA XS Advanced Model, Chapter 4: Developing HTML5 Applications, Section 4.1: Developing HTML5 Applications Using SAP Web IDE for SAP HANA, pp. 77-82.

According to the SAP HANA Performance Guide for Developers1, the .hdinamespace file is a JSON resource that defines the naming rules for the run-time objects in a multi-target application. The name parameter specifies the common name-space prefix for the objects, while the subfolder parameter determines whether the name of the sub-folder is added or ignored in the run-time name space. If you want to keep the names of the objects as short as possible, you should set the subfolder parameter to ignore, so that the name of the sub-folder is not appended to the name-space prefix and the object name. For example, if you have a table named CUSTOMERS in a sub-folder named SALES, and you set the subfolder parameter to ignore, the run-time name of the table will be com.sap.hana.example::CUSTOMERS, where com.sap.hana.example is the name-space prefix defined by the name parameter. If you set the subfolder parameter to append, the run-time name of the table will be com.sap.hana.example.SALES::CUSTOMERS, which is longer and more complex. For more information on the .hdinamespace file and the naming rules, see [The HDI Name-Space Configuration File]2 and [Run-Time Name Spaces in SAP HDI]3.

References: 2: The HDI Name-Space Configuration File 3: Run-Time Name Spaces in SAP HDI 1: SAP HANA Performance Guide for Developers

 According to the SAP Web IDE for SAP HANA Developer Guide, you can debug a Node.js module in SAP Web IDE for SAP HANA by attaching the debugger to the application in the SAP Web IDE for SAP HANA. To do this, you need to open the debugger panel, attach your application, and choose your multi-target application and select a debug target. Then, you can perform the regular debugging tasks, such as setting breakpoints, stepping through the code, examining the variables, and so on. The other options are incorrect, because:

• Setting the enabled parameter to true in the section debugger of the xsengine.ini file is not a way to debug a Node.js module in SAP Web IDE for SAP HANA, but a way to enable the XS JavaScript debugger for XSJS applications. This is not relevant for Node.js modules, which use a different runtime and debugger.
• Adding the sap.hana.xs.debugger::Debugger role to the HDI Container’s #RT User is not a way to debug a Node.js module in SAP Web IDE for SAP HANA, but a way to grant the XS JavaScript debugger privileges to the runtime user of the HDI container. This is not relevant for Node.js modules, which use a different runtime and debugger.
• Starting the debugger from the XS command line interface and running the program in SAP Web IDE for SAP HANA is not a way to debug a Node.js module in SAP Web IDE for SAP HANA, but a way to debug a Node.js module using command-line tools. This is an alternative option for debugging Node.js modules, but it does not use the SAP Web IDE for SAP HANA.

References: SAP Web IDE for SAP HANA Developer Guide, Chapter 6, Section 6.4.2, page 2111.

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