SAP Certified Development Associate C_HANADEV_18 Release Date

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

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.

References:

• 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

 To manage an exception in a SQLScript, you can use the SIGNAL and RESIGNAL features, which are SQLScript statements that allow you to raise and handle errors or warnings in your code. The SIGNAL statement allows you to raise a user-defined exception with a specified message and SQLSTATE value. The RESIGNAL statement allows you to propagate an existing exception to the calling procedure or function, or to modify the message or SQLSTATE value of the exception. You can use the SIGNAL and RESIGNAL statements in combination with the BEGIN and END blocks, and the DECLARE and EXIT HANDLER clauses, to define the scope and the action of the exception handling12.

The other options are not correct because they are not SQLScript features that can be used to manage an exception. The DECLARE EXIT HANDLER clause is a SQL feature that allows you to declare a handler for a specific condition or a generic SQLWARNING, SQLEXCEPTION, or NOT FOUND condition. The CREATE EXIT HANDLER statement is not a valid SQL or SQLScript statement at all. References:

• SAP HANA Platform, SAP HANA SQL and System Views Reference, SQL Reference Manual, SQL Statements, SIGNAL
• SAP HANA Platform, SAP HANA SQL and System Views Reference, SQL Reference Manual, SQL Statements, RESIGNAL

To develop a Node.js application for the SAP HANA platform that executes a SQL statement in the SAP HANA database, you need to use the following modules:

• @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.
• @sap/hdbext: 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/instance-manager: This module provides functions to manage the lifecycle of Node.js applications running on the SAP Cloud Platform or the SAP HANA XS Advanced Model. You can use this module to start, stop, restart, scale, and monitor your applications, but not to execute SQL statements in the SAP HANA database.
• D. @sap/node-vsi: This module provides functions to interact with the SAP HANA Virtual Schema Integrator (VSI), which enables you to access data from remote sources using virtual tables. You can use this module to create, update, delete, and query virtual tables, but not to execute SQL statements in the SAP HANA database.

References:

• SAP HANA Developer Guide for SAP HANA Web IDE, Chapter 5, Section 5.2
• 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