C_HANADEV_18 Exam Dumps - SAP Certified Development Associate Questions and Answers

To prevent changes to existing line items of the sap.test::myTable table, you can use the OData service that specifies the update authorization as no-authorization for the table. This means that the OData service does not allow any update operations on the table, such as PUT, PATCH, or MERGE. The option A shows the code snippet that defines the OData service with this restriction. The other options do not have the update no-authorization clause for the table, and therefore, they do not prevent changes to the existing line items. References: OData Service Authorization, OData Security Considerations.

 According to the SAP HANA SQLScript Reference, the following statements can be used when implementing transaction management logic in SQLScript using savepoints:

• Savepoint: Creates a savepoint with a specified name within the current transaction. A savepoint marks a point in the transaction that can be rolled back to without affecting the rest of the transaction. For example, SAVEPOINT sp1;
• Rollback to savepoint: Rolls back the current transaction to the specified savepoint. All changes made after the savepoint are undone, but the transaction remains active. For example, ROLLBACK TO SAVEPOINT sp1;
• Release savepoint: Releases the specified savepoint and all subsequent savepoints. The released savepoints are no longer valid and cannot be rolled back to. For example, RELEASE SAVEPOINT sp1;

The other options are incorrect, because:

• Reverse savepoint is not a valid statement in SQLScript. There is no such statement in the SAP HANA SQLScript Reference.
• Alter system savepoint is not a statement that can be used in SQLScript, but a statement that can be used in SQL. It triggers a savepoint operation for the entire database system, not for a specific transaction. It is used for administrative purposes, such as backup and recovery, not for transaction management logic.

References: SAP HANA SQLScript Reference, Chapter 6, Section 6.4.2, page 2111.

 SAP HANA extended application services, advanced model (XS advanced) provides a comprehensive platform for the development and execution of micro-service oriented applications, taking advantage of SAP HANA’s in-memory architecture and parallel execution capabilities1. XS advanced supports several programming languages and execution environments, such as Java and Node.js, and also provides compatibility with XS classic model2. To develop native SAP HANA applications in XS advanced, you can use the following new components:

• Git repository: XS advanced integrates with Git, a distributed version control system, to manage the source code of your applications. You can use Git to clone, create, push, pull, merge, and branch your projects, and also to collaborate with other developers3.
• SAP Web IDE for SAP HANA: XS advanced provides a web-based integrated development environment (IDE) that allows you to create, edit, test, debug, and deploy your applications. SAP Web IDE for SAP HANA supports various development tools and features, such as editors, wizards, templates, code completion, syntax highlighting, code analysis, debugging, testing, and deployment3.

The other options are not correct because:

• SAP HANA repository: This is a component of XS classic model, not XS advanced. The SAP HANA repository stores the design-time artifacts of your applications, such as views, procedures, and scripts. In XS advanced, the design-time artifacts are stored in Git repositories instead4.
• SAP HANA studio: This is a desktop-based IDE that can be used to develop applications for XS classic model, but not for XS advanced. SAP HANA studio provides various perspectives and tools to access and manage the SAP HANA database, such as the administration console, the catalog, the content, and the security4.

References: 2: SAP HANA Extended Application Services, Advanced Model 4: SAP HANA Extended Application Services 1: SAP HANA extended application services, advanced model 3: SAP HANA Developer Guide for SAP HANA XS Advanced Model (SAP Web IDE)

According to the SAP Web IDE for SAP HANA Developer Guide, the Node.js environment is characterized by the following features:

• It is single-threaded: Node.js uses a single thread to handle multiple concurrent requests, instead of creating a new thread for each request. This reduces the memory and CPU overhead, and enables high scalability and performance. However, it also means that any blocking or long-running operation can affect the responsiveness of the entire application. Therefore, Node.js relies on asynchronous and non-blocking I/O operations, callbacks, promises, and events to handle concurrency and avoid blocking the main thread.
• It is built on Google’s V8 JavaScript engine: Node.js uses the V8 engine to execute JavaScript code. The V8 engine is a fast and powerful engine that compiles JavaScript code into native machine code, and supports the latest ECMAScript standards and features. The V8 engine also provides access to low-level system resources, such as files, network, and processes, through the Node.js API.

The other options are incorrect, because:

• Node.js does not use a synchronous programming model, but an asynchronous and event-driven programming model. A synchronous programming model means that each operation blocks the execution until it is completed, and the next operation can only start after the previous one is finished. An asynchronous programming model means that each operation can start without waiting for the previous one to finish, and the execution can continue with other tasks while the operation is in progress. An event-driven programming model means that each operation can trigger an event when it is completed, and the event can invoke a callback function that handles the result or the error of the operation.
• Node.js is not a client-side design-time environment for JavaScript, but a server-side run-time environment for JavaScript. A client-side design-time environment for JavaScript means that the JavaScript code is written and executed in the browser, and it can manipulate the HTML document and interact with the user interface. A server-side run-time environment for JavaScript means that the JavaScript code is written and executed on the server, and it can handle HTTP requests and responses, communicate with databases, and perform business logic.

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

According to the SAP HANA Developer Guide, declarative logic in SQL Script is a way of expressing complex data transformations by means of classical relational operators, such as selection, projection, join, aggregation, etc. Declarative logic does not specify how data is processed, but rather what the desired result is. The SAP HANA database has the freedom to optimize the data flow and execution plan, which may result in better performance. Declarative logic is free of side effects, meaning that it does not modify any data or state outside the scope of the statement. Declarative logic declares the flow of data, meaning that it binds new variables that are referenced elsewhere in the body of the procedure or function. The other options are incorrect, because:

• Declarative logic does not support the full set of SQL Script, but only a subset of SQL features that are side-effect free and deterministic. For example, declarative logic does not support imperative constructs, such as loops, conditions, exceptions, etc.
• Declarative logic does not define how data is processed, but rather what the desired result is. How data is processed is determined by the SAP HANA database optimizer, which may choose different execution plans depending on the data characteristics, system resources, and other factors.

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

The SAP HANA XS Advanced Cockpit is a web-based administration tool that allows you to manage the XS Advanced runtime environment, such as organizations, spaces, applications, services, and users. The XS Advanced Cockpit provides a graphical user interface that is similar to the SAP Cloud Platform Cockpit, to provide a consistent user experience in cloud and on-premise. The XS Advanced Cockpit is available for SAP HANA 2.0 SPS03 and later releases, and it replaces the deprecated XS Advanced Administration Tools.

One of the activities that you can perform on an application in the XS Advanced Cockpit is to monitor the applications assigned to the current space. A space is a logical grouping of applications and services that share a common development and runtime environment. Each space belongs to an organization, which is a collection of users and spaces that share a common quota of resources. You can use the XS Advanced Cockpit to view the list of applications deployed in a particular space, and see their status, instances, memory usage, disk usage, and bound services. You can also filter, sort, and search the applications by name, status, or type. You can also drill down into the details of each application, such as logs, events, environment variables, routes, and service bindings.

Another activity that you can perform on an application in the XS Advanced Cockpit is to start, stop, and restart the applications. You can use the XS Advanced Cockpit to control the lifecycle of the applications deployed in a space, such as starting an application that is stopped, stopping an application that is running, or restarting an application that is experiencing issues. You can also scale the applications by changing the number of instances or the memory and disk quota allocated to each instance. You can also delete the applications that are no longer needed.

The other options are incorrect because they are not activities that you can perform on an application in the XS Advanced Cockpit. You cannot deploy applications to SAP Cloud Platform from the XS Advanced Cockpit, as the XS Advanced Cockpit is only for managing the XS Advanced runtime environment on SAP HANA. To deploy applications to SAP Cloud Platform, you need to use the SAP Cloud Platform Cockpit or the Cloud Foundry Command Line Interface (CF CLI). You also cannot display the HDI container content from the XS Advanced Cockpit, as the HDI container is a database object that is not directly related to the application. To display the HDI container content, you need to use the SAP HANA Database Explorer or the SAP Web IDE for SAP HANA. References:

• SAP HANA Platform 2.0 SPS06: SAP HANA XS Advanced Cockpit, Section 1
• SAP HANA Platform 2.0 SPS06: SAP HANA XS Advanced Cockpit, Section 2
• SAP HANA Platform 2.0 SPS06: SAP HANA XS Advanced Cockpit, Section 3
• SAP HANA Platform 2.0 SPS06: SAP HANA XS Advanced Cockpit, Section 4
• SAP HANA Platform 2.0 SPS06: SAP HANA XS Advanced Cockpit, Section 5

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

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