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Snowflake NAS-C01 Exam Syllabus Topics:

Section	Weight	Objectives
Snowflake Native Applications Deployment	25%	- Build, version, and release native applications 1. Use data sharing for app interoperability 2. Use Snowflake's marketplace
Snowflake Native App Framework Overview	20%	- Understand Snowflake architecture, features, tools, and best practices 1. Account security and access management 2. Cloud-based computing and storage concepts 3. Data sharing and protection mechanisms
Snowflake Native Applications Design and Creation	35%	- Create and manage billing events and cost monitoring techniques 1. Formulate Snowflake native application workflows and procedures - Apply Snowflake best practices while building native application workloads 1. Build, distribute, and monetize apps in Snowflake 2. Design scalable applications
Snowflake Native Applications Installation and Testing	20%	- Install and test native applications 1. Validate application functionality and performance

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Snowflake SnowPro Specialty - Native Apps NAS-C01 Prüfungsfragen mit Lösungen (Q221-Q226):

221. Frage
You are developing a Snowflake Native Application and want to implement a usage-based pricing model. Your application writes usage data to a table 'APPLICATION USAGE' in the provider account. You need to create a listing on the Snowflake Marketplace that charges customers based on the number of processed records. Which of the following steps are crucial to correctly setting up the pricing plan within the listing, ensuring that usage data is properly captured and reflected in the customer's bill?

A. Define a resource monitor on the provider account that tracks resource consumption of the application, and use this as the basis for pricing. This requires no customer interaction.
B. Establish a Data Exchange between the provider and consumer accounts, sharing the 'APPLICATION_USAGE' table directly. The listing then references this Data Exchange for pricing.
C. Define a usage-based price metric within the listing that directly queries the 'APPLICATION_USAGE table in the consumer account using a secure view.
D. Configure a usage-based price metric within the listing, pointing it to a secure view created on top of the 'APPLICATION_USAGE' table, explicitly granted to the 'snowflake' account. The secure view should aggregate usage data.
E. Create a stored procedure in the provider account that aggregates the usage data in 'APPLICATION USAGE' , and then configure the listing to execute this stored procedure at regular intervals to calculate charges.

Antwort: D

Begründung:
The correct answer is C. A usage-based price metric must point to a secure view that aggregates usage data from the 'APPLICATION_USAGE table. The secure view ensures that data access is controlled and that consumers only see the aggregated usage information required for billing. Option A is partially correct, but misses explicitly granting access to snowflake account, vital for pricing. Other options are incorrect because they either expose raw data (D), rely on procedures which are hard to manage within the marketplace (B), try to query consumer data which is impossible using provider side secure view (A) or irrelevant to usage based pricing (E).

222. Frage
You are developing a Snowflake Native App that requires uploading multiple large data files (each > 50MB) to a stage for processing. Due to network limitations, you need to optimize the upload process. You have already created the stage and have necessary privileges. Which of the following approaches would be most effective for uploading the files efficiently?

A. Write a Python script leveraging the Snowflake Connector for Python to upload the files using multi-threading or asynchronous operations.
B. Compress the files into a single ZIP archive before uploading using the 'PUT' command.
C. Use the Snowflake Visual Studio Code (VS Code) extension's built-in file upload feature, which automatically handles parallel uploads.
D. Use the 'PUT ' command with the 'PARALLEL' option enabled in SnowSQL.
E. Utilize Snowflake's internal staging using 'PUT command on Internal stage for smaller file and external stage for larger file and then copy the larger file from external to internal by referencing file URL.

Antwort: A,D

Begründung:
Options A and C are the most effective. Option A leverages SnowSQL's 'PARALLEL' option for concurrent uploads. Option C allows fine-grained control over upload concurrency using Python. Option B is less reliable for guaranteed performance tuning. Option D can introduce unnecessary overhead. Option E will increase complexity, so its not a direct approach to optimize upload process.

223. Frage
A Snowflake Native App includes a managed task 'app_db.app_schema.daily_data_processing'. You, as the application provider, need to ensure that consumer accounts can only execute this managed task and have no other privileges. You also need to implement robust error handling to log any failed execution attempts within the consumer account. Which of the following SQL statements, when executed within the application's installation script, provides the most secure and complete solution to achieve these requirements, including error logging within the consumer account (assuming an existing table exists)?

A.
B.
C. GRANT EXECUTE MANAGED TASK ON MANAGED TASK TO APPLICATION ROLE app_public;
D. GRANT EXECUTE MANAGED TASK ON MANAGED TASK TO APPLICATION ROLE app_public WITH GRANT OPTION;
E.

Antwort: B

Begründung:
Option C is the most comprehensive. It grants the necessary USAGE privileges on the database and schema, which are prerequisites for the consumer account's application role to access the managed task. It also includes robust error handling using a BEGIN...EXCEPTION block, logging any errors encountered during the privilege granting process to the 'execution_log' table. Options A and D are missing the necessary USAGE privileges, which would prevent the task from executing. Option B lacks USAGE grants and only handles errors within the GRANT execution itself, not potential issues with missing database/schema access for the role. Option E includes 'WITH GRANT OPTION' , which is unnecessary and potentially insecure as it allows the consumer to further grant the EXECUTE MANAGED TASK privilege.

224. Frage
You are building a Snowflake Native Application that relies on a complex transformation pipeline. This pipeline involves multiple SQL scripts and User-Defined Functions (UDFs). To manage this complexity, you want to ensure that the deployment process is automated and repeatable. Which approach would you consider to manage the deployment and versioning of your application code and its database objects?

A. Rely exclusively on Snowflake's built-in version control features (if available), which automatically manage schema changes.
B. Store SQL Scripts and UDFs external to the application, providing instructions to the consumers to manually download and install.
C. Manually execute each SQL script and UDF creation statement in the consumer's Snowflake environment.
D. Use a deployment tool like Flyway or Liquibase to manage database schema changes and versioning, integrating it into your application's setup script.
E. Package all SQL scripts and UDFs into a single, large SQL file and execute it during installation.

Antwort: D

Begründung:
Using a deployment tool like Flyway or Liquibase (C) enables you to manage database schema changes and versioning in an automated and repeatable manner. These tools allow you to define migrations, apply them in a controlled sequence, and track changes over time. Executing scripts manually (A) is prone to errors and not scalable. A single large SQL file (B) becomes difficult to manage and troubleshoot. Storing SQL scripts external to the application (D) increases risk as the application is tightly linked to external artifacts. Snowflake itself does not provide build-in schema version control(E).

225. Frage
You are preparing a Snowflake Native Application for its initial release. You have a 'setup.sqP file that creates necessary tables and roles. You are also planning for future updates. Which of the following practices will BEST ensure smooth, version-upgrade compatible deployments for your application's consumers?

A. Use a consistent naming convention for all application objects and clearly document any breaking changes in release notes.
B. Use stored procedures within 'setup.sqr to encapsulate schema changes and data migrations, making them idempotent.
C. Always drop and recreate all application objects in each new version's 'setup.sqr to ensure a clean slate.
D. Include detailed comments in 'setup.sql' explaining the purpose of each SQL statement and the logic behind schema changes.
E. Avoid using 'CREATE OR REPLACE TABLE in 'setup.sqr and always use 'CREATE TABLE IF NOT EXISTS.

Antwort: A,B,D

Begründung:
Options B, D, and E will BEST ensure smooth, version-upgrade compatible deployments: Option B: A consistent naming convention and clear documentation of breaking changes enable consumers to understand the impact of updates and adjust their applications accordingly. Option D: Encapsulating schema changes and data migrations within idempotent stored procedures ensures that 'setup.sqr can be run multiple times without causing unintended side effects. This is crucial for handling failed upgrades or re-deployments. Option E: Detailed comments within setup.sqr make the script easier to understand and maintain, both for the application developer and for consumers who may need to troubleshoot or customize the application. Option A is good practice but 'CREATE OR REPLACE TABLE is appropriate for views and functions. Option C is generally a bad practice, as it can lead to data loss or disruption if not handled carefully.

226. Frage
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