Most Recent SAP C_HANADEV_18 Exam Questions & Answers

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.

[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 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.

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.

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].

In application development with XS advanced, the following entities belong to a specific SPACE: Applications and Processes. A SPACE is a logical grouping of applications and processes that share a common purpose and resources. A SPACE can have one or more applications and processes deployed to it, and each application and process can have one or more instances running in the SPACE.A SPACE can also have its own quota, services, routes, and security settings12.

The other two options, Organizations and Users, are not entities that belong to a specific SPACE. An Organization is a logical grouping of SPACES that share a common owner and billing account. An Organization can have one or more SPACES, but a SPACE can only belong to one Organization.An Organization can also have its own quota, roles, and users12. A User is an entity that represents a person or a system that can access the XS advanced platform and perform actions based on the assigned roles and privileges.A User can belong to one or more Organizations and SPACES, and can have different roles and permissions in each of them34.Reference:1:SAP HANA XS Advanced Development (New and Changed) | SAP Help Portal2:SAP HANA XS Advanced, explore the basic tools | SAP3:XS Advanced User Management | SAP Help Portal4:Maintaining Platform Users in XS Advanced | SAP Help Portal