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Snowflake NAS-C01 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Snowflake Native App Framework Overview	20%	- Native application concepts and architecture 1. Application packages and structure 2. Manifest files and setup scripts
Topic 2: Native Application Design and Creation	35%	- Application development workflow 1. Building and versioning applications 2. Application roles and privileges
Topic 3: Installation, Testing and Troubleshooting	20%	- Validation and debugging 1. Logging and event tables 2. Tracing and troubleshooting workflows
Topic 4: Deployment and Marketplace Publishing	25%	- Distribution and lifecycle management 1. Marketplace listings and publishing 2. Version upgrades and release management

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Snowflake SnowPro Specialty - Native Apps 認定 NAS-C01 試験問題 (Q249-Q254):

質問 # 249
You are designing a Snowflake Native App that relies on a specific version of a shared library. You want to ensure that your application continues to function correctly even if the provider of the shared library releases a new, incompatible version. How can you achieve version isolation for your application's dependencies within the Snowflake Native App Framework?

A. Implement a custom version compatibility check within your application code to gracefully handle potential incompatibilities with newer versions of the shared library.
B. Utilize Snowflake's 'API_INTEGRATION' to create endpoint where you have version control for the shared library.
C. Leverage Snowflake's dependency management system to specify a version range for the shared library in your application's setup script.
D. Utilize the ' feature to directly link your application to a specific version of the shared library hosted in an external repository.
E. Package the required version of the shared library directly within your application's code bundle, ensuring it is isolated from any external updates.

正解：E

解説：
Packaging the required version of the shared library directly within your application's code bundle (B) provides the most reliable version isolation. This ensures that your application always uses the version it was designed for, regardless of any external updates. While options A, C, D, and E are valid approaches in other contexts, they do not provide the same level of isolation within the Snowflake Native App Framework. Snowflake Native Apps do not utilize for this purpose, nor do they have a specific dependency management system like option C. Version checking (D) is a good practice but doesn't prevent the application from being affected by the newer version. Using SAPI INTEGRATION' would not provide version control.

質問 # 250
You are troubleshooting a Snowflake Native Application installation that consistently fails with a cryptic error message: 'Internal Application Error: Check application logs for details'. You have access to the application's code package but are unsure how to effectively gather detailed logs and telemetry data from the running application. Which strategy would provide the MOST comprehensive and maintainable observability solution within the Snowflake Native App framework?

A. Rely solely on the error messages returned by Snowflake during application execution, as these are sufficient for identifying most installation issues.
B. Integrate a third-party logging framework (e.g., Log4j) into the application code and configure it to write logs to an external logging service accessible over the internet.
C. Utilize the view to analyze query execution patterns and identify potential bottlenecks within the application's SQL code.
D. Implement calls within the application code to write log messages directly to a Snowflake table owned by the application provider. Consumers can then query this table to view logs.
E. Leverage Snowflake's event tables and configure the application to emit custom events to these tables. Consumers can then subscribe to these events to monitor application behavior.

正解：D

解説：
Option A is the most comprehensive and maintainable solution. 'SYSTEM$LOG' provides a native and secure mechanism for writing logs directly to a Snowflake table controlled by the application provider. This avoids the complexity and security risks of using external logging services (C) and provides structured, queryable log data within the Snowflake environment. B is helpful for performance, D is good, but not a native way. E relies on just error messages.

質問 # 251
You are developing a Snowflake Native App that requires specific privileges to access data in the consumer's account. In your manifest file, you want to request these privileges. Which of the following statements best describes the correct way to request these privileges within the 'privileges' section of the manifest file?

A. Privileges are automatically granted to the application based on the roles specified in the application code. No explicit declaration is needed in the manifest file.
B. Specify a list of required privileges under the 'privileges' section, detailing the specific objects (databases, schemas, tables) and actions (SELECT, INSERT, UPDATE) the application needs to perform.
C. You can only request privileges for future grants. Existing object grants are not supported in manifest file.
D. Use the 'allowed_roles' section in the manifest to list the roles that are allowed to access data in the consumer's account, Snowflake automatically grants necessary privileges to these roles.
E. Privileges are managed entirely through the application's setup scripts. The manifest file does not play a role in privilege management.

正解：B

解説：
The 'privileges' section of the manifest file is used to declare the specific privileges required by the application. This includes specifying the objects (databases, schemas, tables) and actions (SELECT, INSERT, UPDATE) that the application needs to perform in the consumer's account. Snowflake uses this information to manage access control and ensure that the application has the necessary permissions to function correctly.

質問 # 252
You have released version 1.0 of your Snowflake Native Application. After receiving feedback, you release version 1.1 with breaking changes to the data schema in the application's managed database. Some consumers haven't upgraded yet. How can you ensure that the older version continues to function correctly while allowing new consumers to use the updated schema?

A. Deprecate version 1.0 and provide a limited support window, after which it will be removed. All consumers will need to upgrade within the window.
B. Create a compatibility layer within version 1.1 that detects the application version and adapts the data access logic accordingly. This would require use of the 'APPLICATION$VERSION' function.
C. Force all consumers to upgrade to version 1.1 immediately, providing detailed migration instructions.
D. Implement a data virtualization layer on the consumer's side, mapping the old schema to the new schema.
E. Maintain two separate application packages: one for version 1.0 and one for version 1.1. Version 1.1 includes logic to automatically migrate data for consumers who upgrade.

正解：B、E

解説：
The best approaches are (B) and (C). Option (B) allows the new version (1.1 ) to handle requests from older versions by adapting its data access logic based on the reported application version. The 'APPLICATION$VERSION' function can be invaluable here. Option (C) maintains two separate application packages. The upgrade process for consumers moving to version 1.1 should include a data migration step. Forcing immediate upgrades (A) is disruptive. Simply deprecating the old version (D) without a smooth transition will upset consumers. Option E places undue burden on the consumer.

質問 # 253
An ISV is developing a data analytics application using Snowflake Native Apps. The application allows consumers to define custom data refresh schedules. These schedules are managed by stored procedures within the application. The stored procedures need to update a shared table (using SQL MERGE command) located in a different database (managed by the ISV) within the consumer's account. The Application provider doesn't want to give access to the underlying tables to the consumer. To achieve this, which of the following GRANT statements are needed to configure the correct set of privileges for the ISV's Application Role(s) to perform MERGE operations from inside the consumer's environment? (Select all that apply.)

A. GRANT INSERT, UPDATE, DELETE ON TABLE .. TO ROLE ;
B. GRANT USAGE ON SCHEMA TO ROLE ;
C. GRANT USAGE ON DATABASE TO ROLE ;
D. GRANT SELECT ON ALL TABLES IN DATABASE TO ROLE ;
E. GRANT ALL PRIVILEGES ON WAREHOUSE TO ROLE ;

正解：A、B、C

解説：
To perform MERGE operations, the ISV application needs the following privileges: USAGE on the ISV database. USAGE on the ISV schema. INSERT, UPDATE, and DELETE on the shared table. SELECT is not enough for MERGE. Granting ALL PRIVILEGES on the warehouse is too broad and unnecessary for the specific task. Granting select on all tables is not required either as you're targeting a single table for DML operation.

質問 # 254
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