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

According to the SAP HANA Developer Guide, you use the pull operation to synchronize all unsynchronized changes of the remote Git branch with a local Git branch. The pull operation fetches the changes from the remote branch and merges them with the local branch. This way, you can update your local branch with the latest changes from the remote branch. The other options are incorrect, because:

• Push is the opposite of pull. It sends the changes from the local branch to the remote branch, not the other way around.
• Rebase is an alternative to merge. It rewrites the history of the local branch by applying the changes from the remote branch as new commits on top of the local branch. This creates a linear history, but it may cause conflicts or lose some information.
• Reset is a way to undo changes in the local branch. It moves the branch pointer to a different commit, and optionally discards the changes in the working directory or the staging area.

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

To run an SQL statement against the SAP HANA database from a Node.js application, you need to use the @sap/hdbext module. This module provides a wrapper for the SAP HANA client for Node.js, which enables you to connect to the SAP HANA database and execute SQL statements. You can use this module to create a database connection pool, execute queries, fetch results, and handle errors. The other options are not correct because:

• A. @sap/hdi: This module provides functions to interact with the SAP HANA Deployment Infrastructure (HDI), which enables you to create and manage database artifacts, such as tables, views, procedures, and functions, using the HDI container service. You can use this module to deploy, undeploy, and access HDI containers, but not to run SQL statements against the SAP HANA database.
• B. @sap/xsenv: This module provides functions to load service configuration and credentials from the environment variables of the SAP Cloud Platform or the SAP HANA XS Advanced Model. You can use this module to access the SAP HANA database service information, such as host, port, user, password, and schema, but not to run SQL statements against the SAP HANA database.
• C. @sap/xssec: This module provides functions to handle authentication and authorization for Node.js applications using the User Account and Authentication (UAA) service and the XSUAA service. You can use this module to verify JWT tokens, check scopes, and obtain user information, but not to run SQL statements against the SAP HANA database.

References:

• SAP HANA Developer Guide for SAP HANA Web IDE, Chapter 5, Section 5.3
• SAP HANA Developer Guide for SAP HANA Web IDE, Chapter 5, Section 5.4
• SAP HANA Developer Guide for SAP HANA Web IDE, Chapter 5, Section 5.5
• SAP HANA Developer Guide for SAP HANA Web IDE, Chapter 5, Section 5.6

According to the SAP HANA Performance Guide for Developers1, the SQL Analyzer tool can help you understand and analyze the execution plan of a SQL statement, and identify potential bottlenecks and optimizations. Some of the possible optimizations are:

• Modify SQL hints: SQL hints are directives that you can add to a SQL statement to influence the behavior of the SQL optimizer. For example, you can use hints to specify a join type, a join order, a join condition, a table distribution, or a parallel degree. SQL hints can help you improve the performance of a query by overriding the default choices of the optimizer, or by providing additional information that the optimizer cannot infer from the data or statistics. However, SQL hints should be used with caution, as they can also have negative effects if they are not compatible with the data characteristics or the system configuration. Therefore, you should always test the impact of SQL hints on the query execution time and resource consumption, and compare the results with the original query without hints. You can use the SQL Analyzer tool to view the effect of SQL hints on the execution plan, and modify them accordingly. For more information on SQL hints, see [SAP HANA SQL and System Views Reference].
• Change the data model: The data model is the logical representation of the data and the relationships among them. The data model can have a significant impact on the performance of a query, as it determines how the data is stored, accessed, and processed by the database. A well-designed data model can reduce the complexity and cost of a query, and enable the use of efficient operators and algorithms. On the other hand, a poorly-designed data model can lead to redundant or inconsistent data, unnecessary joins or aggregations, or suboptimal access paths. Therefore, you should always review the data model and consider changing it if it does not meet the requirements of the query or the application. For example, you can use different types of views, such as calculation views, analytical views, or attribute views, to model the data according to the business logic and the analytical needs. You can also use different types of tables, such as column tables, row tables, or partitioned tables, to store the data according to the access patterns and the distribution strategies. You can use the SQL Analyzer tool to view the data model of the query, and identify the possible changes that can improve the performance. For more information on data modeling, see [SAP HANA Modeling Guide].

References: 1: SAP HANA Performance Guide for Developers : SAP HANA SQL and System Views Reference : SAP HANA Modeling Guide

To create a native SAP HANA application that fully leverages the SAP HANA platform, you should implement data-intensive calculations on the database layer, using SQLScript or calculation views. SQLScript is a scripting language that allows you to write stored procedures, functions, and triggers that perform complex calculations and data transformations on the SAP HANA database. Calculation views are graphical or scripted views that define data models based on tables, views, or other calculation views, and apply filters, joins, aggregations, and other operations on the data. By pushing the calculations onto the database layer, you can take advantage of the in-memory processing, parallelization, and optimization capabilities of SAP HANA, and reduce the data transfer and network latency between the application layer and the database layer123.

The other options are not correct because they do not fully leverage the SAP HANA platform, and they may result in poor performance, high resource consumption, and increased complexity. Pushing the calculations onto the application layer means that you use a programming language, such as Java or Node.js, to perform the calculations on the application server, which may not be as efficient or scalable as the database server. Pushing the calculations onto the presentation layer means that you use a UI framework, such as SAPUI5 or SAP Fiori, to perform the calculations on the client device, such as a browser or a mobile device, which may not have enough processing power or memory to handle large or complex data sets. Distributing the calculations between the application layer and the presentation layer means that you split the calculations into different parts and execute them on different layers, which may introduce inconsistency, redundancy, and dependency issues. References:

• SAP HANA Platform, SAP HANA SQL and System Views Reference, SQLScript Guide
• SAP HANA Platform, SAP HANA Modeling Guide for SAP HANA Web Workbench, Calculation Views
• SAP HANA Platform, Developing Applications with SAP HANA Cloud Platform, Developing Multi-Target Applications, Developing Database Modules

To access a remote database table object within your HDB module in a Multi-target application project, you need to perform the following activities:

• Create/update the .hdbgrants file providing authorizations for the remote schema. This file defines the privileges that are granted to the HDI container technical users for accessing the remote schema. You need to specify the user-provided service name, the schema name, and the privileges, such as SELECT, INSERT, UPDATE, DELETE, EXECUTE, etc. You can also use the wildcard character (*) to grant privileges on all objects in the remote schema.
• Create a synonym for the remote table object. A synonym is a database object that provides an alternative name for another database object, such as a table, view, or procedure. You can use synonyms to simplify the access to remote objects by avoiding the need to specify the full qualified name. You can create a synonym in your HDB module by using the .hdbsynonym file, where you specify the target object name, the target object schema, and the user-provided service name.
• Create a view that refers to the table. A view is a database object that defines a logical table based on the result set of a SQL query. You can use views to access data from one or more tables, including remote tables, by applying filters, joins, aggregations, calculations, etc. You can create a view in your HDB module by using the .hdbview file, where you specify the SQL query that references the synonym of the remote table object.

The other options are incorrect because you do not need to create a view that refers to a synonym, nor create a synonym that refers to a view. These are redundant steps that do not add any value to the access of the remote table object. References:

• Accessing Remote Data - SAP Help Portal
• Granting Privileges on Remote Schemas - SAP Help Portal
• Creating Synonyms - SAP Help Portal
• Creating Views - SAP Help Portal

 To specify the target currency for currency conversion in calculation views, you can use one of the following methods:

• In a column: You can associate the measure with an attribute column that contains the target currency code. For example, if you have a table that stores the sales amount and the currency code for each transaction, you can use the currency code column as the target currency for the sales amount measure.
• With an input parameter: You can create an input parameter that allows the user to select or enter the target currency code at runtime. For example, if you want to display the sales amount in different currencies based on the user’s preference, you can use an input parameter as the target currency for the sales amount measure.
• With a fixed value: You can associate the measure with a fixed currency code that is available in the currency table. For example, if you want to display the sales amount in a single currency, such as USD, you can use a fixed value as the target currency for the sales amount measure. References: Associate Measures with Currency, How to perform Currency Conversion in SAP HANA, Implementing Currency Conversion.

An HTML5 module is a module that contains static web content, such as HTML, CSS, JavaScript, or images, that are delivered by a web server. An HTML5 module can be part of a multi-target application (MTA) project, which is a single application that consists of multiple modules that are developed using different technologies and designed to run on different target runtime environments. An HTML5 module can be deployed to the XS Advanced runtime environment, which is a platform that supports the development and execution of cloud-native applications on SAP HANA.

To change the file that is initially delivered by an HTML5 module, you need to adapt the welcome file parameter of the xs-app.json file. The xs-app.json file is a configuration file that defines the routing rules and authentication settings for the HTML5 module. The welcome file parameter specifies the name of the file that is served as the default document when the root path of the HTML5 module is requested. For example, if the welcome file parameter is set to “index.html”, then the file index.html in the HTML5 module will be delivered when the user accesses the URL of the HTML5 module without any additional path. The welcome file parameter can be changed to any valid file name that exists in the HTML5 module.

The other options are incorrect because they are not parameters that can be used to change the file that is initially delivered by an HTML5 module. The service_url parameter of the mta.xml file is a parameter that defines the URL of a service that is required by a module or provided by a resource in an MTA project. The start parameter of the package.json file is a parameter that defines the script that is executed when the npm start command is run in a Node.js module. The runners parameter of the project.json file is a parameter that defines the configuration of the runners that are used to execute the code in a Cloud Foundry module. References:

• SAP HANA Platform 2.0 SPS06: Developing Multitarget Applications, Section 1.1
• SAP HANA Platform 2.0 SPS06: Developing Multitarget Applications, Section 1.3
• SAP HANA Platform 2.0 SPS06: Developing Multitarget Applications, Section 2.1
• SAP HANA Platform 2.0 SPS06: Developing Multitarget Applications, Section 2.2
• SAP HANA Platform 2.0 SPS06: Developing Multitarget Applications, Section 2.3
• SAP HANA Platform 2.0 SPS06: Developing Multitarget Applications, Section 2.4
• SAP HANA Platform 2.0 SPS06: Developing Multitarget Applications, Section 2.5
• SAP HANA Platform 2.0 SPS06: Developing Multitarget Applications, Section 2.6
• SAP HANA Platform 2.0 SPS06: Developing Multitarget Applications, Section 2.7
• SAP HANA Platform 2.0 SPS06: Developing Multitarget Applications, Section 2.8
• SAP HANA Platform 2.0 SPS06: Developing Multitarget Applications, Section 2.9

You can grant a role to another role or to a user in SAP HANA. A role is a collection of privileges that can be assigned to users or other roles to authorize them to perform certain tasks or access certain objects in the database. A user is an individual account that can log on to the database and execute SQL statements. By granting a role to another role, you can create a hierarchy of roles that inherit the privileges of their parent roles. By granting a role to a user, you can assign the user the privileges of that role. You can use the GRANT statement or the SAP HANA cockpit to grant roles to roles or users. The other options are incorrect because you cannot grant a role to an object or a privilege. An object is a database entity, such as a table, view, procedure, etc., that can be accessed or manipulated by users or roles with the appropriate privileges. A privilege is a permission to perform a specific action or access a specific object in the database. You can grant privileges to users or roles, but not to roles or objects. References:

• Roles and Privileges - SAP Help Portal
• Users and Roles - SAP Help Portal
• GRANT Statement (Roles) - SAP Help Portal
• [Granting Roles to Users and Roles] - SAP Help Portal