SAP Updated C_HANADEV_18 Exam Questions and Answers by nate

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, the SAP HANA Deployment Infrastructure (HDI) uses so-called containers to store design-time artifacts and the corresponding deployed run-time (catalog) objects. The HDI makes a strict separation between design-time and run-time objects by introducing the following, distinct container types:

• Design-time container (DTC): A Git repository that stores the design-time artifacts, such as CDS files, SQL files, or HDB files, that define the database objects in the persistence model. The DTC is part of the database module of the multi-target application (MTA).
• Run-time container (RTC): A schema in the SAP HANA database that stores the run-time objects, such as tables, views, or procedures, that are created based on the design-time artifacts. The RTC is also known as the HDI container.
• Build container (BTC): A temporary schema in the SAP HANA database that is used to build the run-time objects from the design-time artifacts. The BTC is deleted after the build process is completed.

When you define a database object in the persistence model, you create a design-time artifact in the DTC. When you deploy the database module of the MTA, the HDI creates an RTC and a BTC, and builds the corresponding run-time object in the RTC based on the design-time artifact. The BTC is then dropped, and the RTC remains as the HDI container for the database module. References: SAP HANA Developer Guide, Chapter 6, Section 6.4.2, page 2111.

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.

A role template is a JSON file that defines the permissions and scopes for a specific role in a multi-target application. A scope is a string that represents a specific access right or privilege for a resource or service. For example, a scope can be used to grant read or write access to a database table or an OData service. A role template references the scopes that are required for the role to function properly. A role collection is a group of roles that can be assigned to a user or a group. A role is a collection of permissions and scopes that define what a user can do in an application. A route is a mapping between a URL path and a destination service in a multi-target application. A route is not related to a role template. References:

• SAP HANA 2.0 SPS06 - Application Development for SAP HANA1, Section 6.1.1, p. 147-148
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.1, p. 25-26
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.2, p. 27-28
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.3, p. 29-30
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.4, p. 31-32
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.5, p. 33-34
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.6, p. 35-36
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.7, p. 37-38
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.8, p. 39-40
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.9, p. 41-42
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.10, p. 43-44
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.11, p. 45-46
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.12, p. 47-48
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.13, p. 49-50
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.14, p. 51-52
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.15, p. 53-54
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.16, p. 55-56
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.17, p. 57-58
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.18, p. 59-60
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.19, p. 61-62
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.20, p. 63-64
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.21, p. 65-66
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.22, p. 67-68
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.23, p. 69-70
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.24, p. 71-72
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.25, p. 73-74
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.26, p. 75-76
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.27, p. 77-78
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.28, p. 79-80
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.29, p. 81-82
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.30, p. 83-84
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.31, p. 85-86
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.32, p. 87-88
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.33, p. 89-90
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.34, p. 91-92
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.35, p. 93-94
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.36, p. 95-96
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.37, p. 97-98
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.38, p. 99-100
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.39, p. 101-102
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.40, p. 103-104
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.41, p. 105-106
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.42, p. 107-108
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.43, p. 109-110
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.44, p. 111-112
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.45, p. 113-114
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.46, p. 115-116
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.47, p. 117-118
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.48, p. 119-120
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.49, p. 121-122
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.50, p. 123-124
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.51, p. 125-126
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment2, Section 3.1.52, p. 127-128
• SAP HANA 2.0 SPS06 - Cloud Foundry Environment