C_HANADEV_18 Exam Dumps - SAP Certified Development Associate Questions and Answers

To create a multi-target application that will use XSJS, you need to create a Node.js module type in your application project. XSJS is a scripting language that allows you to implement server-side logic and access SAP HANA database features using JavaScript syntax. XSJS is supported by the Node.js runtime of the SAP HANA XS Advanced Model, which provides the necessary libraries and services to execute XSJS code. You can use the SAP Web IDE for SAP HANA to create a Node.js module and add XSJS files to it. The other options are not correct because:

• A. Java is not the module type you need to create for XSJS, as XSJS is not a Java-based language. Java is a module type that allows you to implement Java applications using the Java runtime of the SAP HANA XS Advanced Model.
• B. SAP HANA database is not the module type you need to create for XSJS, as XSJS is not a database object. SAP HANA database is a module type that allows you to create database artifacts, such as tables, views, procedures, and functions, using the SAP HANA deployment infrastructure (HDI).
• D. HTML5 is not the module type you need to create for XSJS, as XSJS is not a web page. HTML5 is a module type that allows you to create static web content, such as HTML, CSS, and JavaScript files, using the HTML5 application repository service.

References:

• SAP HANA Developer Guide for SAP HANA Web IDE, Chapter 5, Section 5.6
• SAP HANA Developer Guide for SAP HANA Web IDE, Chapter 5, Section 5.7
• SAP HANA Developer Guide for SAP HANA Web IDE, Chapter 5, Section 5.8
• SAP HANA Developer Guide for SAP HANA Web IDE, Chapter 5, Section 5.9

According to the SAP HANA Developer Guide, the resource path of an OData service URL identifies the entity or entity set that is requested. The resource path consists of the service root URI followed by a slash (/) and the name of the entity set. For example, to view all available products in the Products entity set, the resource path is /Products. The other options are incorrect, because:

• /Products/$metadata is not a valid resource path, but a system query option that returns the metadata document of the OData service.
• /Products/’ is not a valid resource path, but a syntax error. The single quotation mark is not needed after the entity set name.
• /Products/ALL is not a valid resource path, but a filter expression that can be used as a query option. The filter expression must be preceded by a question mark (?) and the $filter system query option. For example, /Products?$filter=ALL.

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

Dynamic SQL allows you to construct and execute SQL statements at run time, using variables and expressions that may not be supported in SQLScript. However, it also has some drawbacks, such as:

• Limited opportunities for optimization: The SQL statement is potentially recompiled every time it is executed, which may affect the performance and resource consumption. The optimizer cannot use static information, such as data types, cardinalities, or indexes, to generate an optimal execution plan. The statement may also bypass the SQL cache, which stores the results of frequently executed queries for faster retrieval.
• Additional SQL execution privileges are required: The user who executes the dynamic SQL statement must have the necessary privileges to access the objects and operations referenced in the statement. This may pose a security risk, as the user may gain access to sensitive data or perform unauthorized actions. To prevent SQL injection attacks, the dynamic SQL statement should be validated and sanitized before execution.

The other options are incorrect, because:

• It is possible to bind the result of a dynamic SQL statement to a SQLScript variable, using the INTO clause of the EXECUTE IMMEDIATE statement. For example, EXECUTE IMMEDIATE 'SELECT COUNT(*) FROM "TABLE"' INTO lv_count;
• It is possible to use SQLScript variables in a dynamic SQL statement, using the USING clause of the EXECUTE IMMEDIATE statement. For example, EXECUTE IMMEDIATE 'SELECT * FROM "TABLE" WHERE "COLUMN" = ?' USING lv_value;

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

SQLScript is a scripting language that extends the SQL standard and allows you to implement application logic in the database layer. Some of the advantages of SQLScript compared to plain SQL queries are:

• It enables modular parameterized programming, which means you can define reusable functions and procedures with input and output parameters, local variables, and control structures. This allows you to write more structured, maintainable, and testable code.
• It increases performance by parallel execution of complex SQL statements, which means you can leverage the parallel processing capabilities of SAP HANA and reduce the data transfer between the database and the application layer. SQLScript also supports data-intensive operations such as table functions, cursors, and dynamic SQL.

The other options are not correct because:

• It does not contain a well-defined ANSI standard, as SQLScript is a proprietary extension of SQL that is specific to SAP HANA. However, SQLScript is compatible with the SQL standard and supports most of the SQL features and syntax.
• It does not retrieve a high data volume from a database, as SQLScript is designed to process data in the database layer and return only the relevant results to the application layer. SQLScript follows the principle of “push-down” computation, which means it minimizes the data transfer and maximizes the performance.

References:

• SAP HANA SQL and System Views Reference, Chapter 1, Section 1.1
• SAP HANA SQLScript Reference, Chapter 1, Section 1.1
• SAP HANA Developer Guide for SAP HANA Web IDE, Chapter 4, Section 4.1

The SQL Script Code Analyser is a tool that scans SQL Script code for potential issues and provides suggestions for improvement. The tool can be accessed from the SAP Web IDE for SAP HANA or from the SAP HANA database explorer. The tool scans for issues in the following categories:

• Performance: This category covers issues that may affect the execution time or resource consumption of the SQL Script code, such as inefficient joins, missing indexes, unnecessary data transfers, etc. The tool provides recommendations for optimizing the code, such as using parallel processing, avoiding nested loops, using table variables, etc.
• Security: This category covers issues that may expose the SQL Script code to security risks, such as SQL injection, privilege escalation, data leakage, etc. The tool provides recommendations for securing the code, such as using parameterized queries, escaping literals, applying proper authorization checks, etc.
• Consistency: This category covers issues that may affect the readability, maintainability, or portability of the SQL Script code, such as coding style, naming conventions, documentation, compatibility, etc. The tool provides recommendations for improving the code quality, such as using consistent indentation, avoiding hard-coded values, adding comments, following best practices, etc.

The other options are incorrect because privileges and business logic are not issue categories that the SQL Script Code Analyser scans for. Privileges are handled by the SAP HANA Deployment Infrastructure framework, which automatically grants the necessary privileges to the technical users and roles that access the HDI container objects. Business logic is the domain-specific logic that defines the functionality and behavior of the SQL Script code, and it is not within the scope of the tool to verify or validate it. References:

• SQL Script Code Analyzer - SAP Help Portal
• SQL Script Code Analyzer in SAP Web IDE for SAP HANA - SAP Help Portal
• SQL Script Code Analyzer in SAP HANA Database Explorer - SAP Help Portal
• HA150 - SAP HANA 2.0 SPS06 SQLScript for SAP HANA - SAP Training

The package descriptor package.json is a JSON file that defines the build, deployment, and runtime dependencies of a JavaScript application in SAP HANA XS Advanced. The package.json file is mandatory for JavaScript applications and it is located in the general section of the project. As well as the application name and version, dependencies to other Node.js modules, the Node.js version, run scripts, and the main program are configured. The package descriptor package.json is used for the following purposes:

• To list the package dependencies: The package.json file contains a dependencies property that lists the names and versions of the Node.js modules that the application depends on. These modules are installed by the npm install command during the build process and are available in the node_modules folder of the application. The dependencies property can also specify the scope and type of the dependencies, such as devDependencies for development-only modules, or peerDependencies for modules that are required by other modules.
• To define the routes: The package.json file contains a sap.cloud.service property that defines the name of the service that the application provides or consumes. This name is used to generate the routes for the application in the XS advanced environment. The routes are defined in the xs-app.json file, which is located in the same folder as the package.json file. The routes specify the rules for forwarding requests to the back-end microservices or destinations.

The following purposes are not achieved by the package descriptor package.json, but by other files or tools:

• To define back-end destinations: The back-end destinations are defined in the mta.yaml file, which is the deployment descriptor file that specifies the metadata and dependencies for the multi-target application (MTA) project. The mta.yaml file is located in the root folder of the MTA project and is used by the Cloud Foundry environment to deploy the application. The back-end destinations are declared as resources of type org.cloudfoundry.existing-service or org.cloudfoundry.managed-service, and are bound to the application modules by the requires property.
• To set the router version: The router version is set by the @sap/approuter module, which is a Node.js module that provides the application router service for the XS advanced environment. The application router service is responsible for routing requests to the appropriate destinations and for authenticating users. The @sap/approuter module is installed by the npm install command during the build process and is available in the node_modules folder of the application. The version of the @sap/approuter module is specified in the dependencies property of the package.json file.

References:

• [SAP HANA Deployment Infrastructure Reference], Chapter 5: HDI with XS Advanced, Section 5.1: Developing with the SAP Web IDE for SAP HANA, Subsection 5.1.2: Configure Application Routing (xs-app.json), pp. 101-104.
• [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, Subsection 4.1.3: Configure Application Routing (xs-app.json), pp. 77-80.

When you create an HDI database role using the SAP Web IDE for SAP HANA, you define the role in a design-time file with the extension .hdbrole. This file is part of your project and can be deployed to the HDI container as a runtime role. However, if you make any changes to the runtime role directly in the database, such as granting or revoking privileges, those changes are not reflected in the design-time file. Therefore, if you change and re-build the design-time role, the runtime role will be overwritten with the new version of the design-time role, and any runtime modifications will be lost. This is because the deployment process always drops and recreates the runtime role based on the design-time role. The other options are incorrect because the deployment of the role will not fail, the runtime modifications will not be kept, and you do not need to confirm the runtime modifications. References:

• SAP HANA DI Administrator Roles - SAP Help Portal
• SAP HANA Deployment Infrastructure Reference - SAP Help Portal
• Modifying the default access_role in HDI containers - SAP Blogs

 A calculation view of type “SQL Access Only” is a calculation view that is not visible to the reporting tools and does not support multidimensional reporting. However, it can be directly accessed via SQL and used as a modelled data source for another view. This type of calculation view is useful for scenarios where you want to perform complex calculations or transformations on the data, but do not need to expose the result to the end users or analytical applications. You can use the SQL Access Only calculation view as an intermediate step in your data modelling process, and then use another calculation view with data category Cube or Dimension to provide the final output for reporting or analysis. The other options are incorrect because a calculation view of type “SQL Access Only” cannot be directly exposed to all client tools or used for multidimensional analysis. These features are only available for calculation views with data category Cube or Dimension. References:

• Supported Data Categories for Calculation Views - SAP Help Portal
• Quick Reference: Calculation View Properties - SAP Help Portal
• SAP HANA Modeling Guide for SAP HANA Studio - SAP Help Portal
• New Hierarchy SQL enablement with Calculation Views in SAP HANA 1.0 SPS 10 - SAP Blogs
• HA300 - SAP HANA 2.0 SPS06 Modeling - SAP Training

According to the SAP HANA Developer Guide, you can use the DEFAULT EMPTY clause to initialize IN/OUT table parameters in an SQL Script procedure. This clause specifies that the table parameter is initially empty when the procedure is called, and that the caller can pass an empty table or no table at all. This is useful when you want to use the table parameter as a temporary table inside the procedure, and return the result to the caller. For example, PROCEDURE proc1 (IN/OUT tab1 TABLE(col1 INT, col2 VARCHAR(10)) DEFAULT EMPTY) ... The other options are incorrect, because:

• IS_EMPTY is a function that returns a boolean value indicating whether a table is empty or not. It is not a clause that can be used to initialize table parameters.
• DEFAULT is a clause that can be used to assign a default value to scalar parameters, not table parameters.
• SET is a statement that can be used to assign values to variables or parameters, not a clause that can be used to initialize table parameters.

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

 To see the commits applied to the file in the remote Git repository without syncing the file, you need to use the git fetch command. This command downloads the latest changes from the remote repository to your local repository, but does not merge them with your local branches. This way, you can inspect the differences between your local and remote files, and decide whether to merge them later or not. You can use the SAP Web IDE for SAP HANA or the command line to execute the git fetch command. The other options are incorrect because they either sync the file or do not download the changes from the remote repository. The git stash command saves your local changes to a temporary stash and reverts your working directory to the last commit. This command is useful when you want to switch branches or pull changes without committing your local changes, but it does not download the changes from the remote repository. The git merge command combines the changes from one branch into another branch. This command is useful when you want to sync your local branch with the remote branch, but it does not allow you to see the commits applied to the file before merging. The git pull command fetches and merges the changes from the remote repository into your local branch. This command is useful when you want to update your local branch with the latest changes from the remote branch, but it does not allow you to see the commits applied to the file before merging. References:

• Git Fetch - SAP Help Portal
• Git Merge - SAP Help Portal
• Git Pull - SAP Help Portal
• Git Stash - SAP Help Portal
• HA100 - SAP HANA 2.0 SPS06 Introduction - SAP Training