COF-C02 Exam Dumps - SnowPro Core Certification Exam

OBJECT_CONSTRUCT() converts each row into a single VARIANT object, which can then be unloaded in JSON format using COPY INTO. This is essential when converting relational data into semi-structured JSON.

In the execution time summary of a Query Profile in Snowflake, the categories included provide insights into various aspects of query execution. "Pruning" refers to the process by which Snowflake reduces the amount of data scanned by eliminating partitions of data that are not relevant to the query, thus improving performance. "Initialization" represents the time taken for query planning and setup before actual execution begins. These metrics are crucial for understanding and optimizing query performance.

Comprehensive and Detailed Explanation From Exact Extract:

Why B (Settings of = 0 or = NULL indicate that the warehouses will remain active indefinitely) is correct:According to the official Snowflake Documentation on Virtual Warehouses, the AUTO_SUSPEND parameter specifies the number of seconds of inactivity after which a warehouse is automatically suspended.

The documentation states:

“If AUTO_SUSPEND is set to NULL or 0, automatic suspension is disabled. The warehouse will never automatically suspend and will remain active until it is explicitly suspended by the user.”

Therefore:

AUTO_SUSPEND = 0 → disables automatic suspension (warehouse runs indefinitely).

AUTO_SUSPEND = NULL → same behavior; auto-suspend is disabled (warehouse remains active indefinitely).

This means both settings have the same outcome — the warehouse will not auto-suspend regardless of idleness.

Why A is incorrect:A setting of AUTO_SUSPEND = 0 does not mean the warehouse stops immediately. It actually means the auto-suspend feature is disabled, so the warehouse continues running indefinitely until manually suspended.

Why C is incorrect:Neither 0 nor NULL cause immediate suspension. The warehouse continues to run until manually suspended.

Why D is incorrect:There is no default period of 600 seconds when AUTO_SUSPEND is set to NULL. The 600-second (10-minute) value is a common configuration example, but not a default value for NULL.

References (Snowflake SnowPro Core / Study Guide / Official Documentation):

Snowflake Documentation — Virtual Warehouses > Parameters > AUTO_SUSPEND:“Specifies the number of seconds of inactivity after which a warehouse is automatically suspended. A value of NULL or 0 disables automatic suspension.”

Snowflake Study Guide — Account and Resource Management:Describes AUTO_SUSPEND behavior for resource optimization and billing control, clarifying that disabling this feature (0 or NULL) causes warehouses to stay active indefinitely until manually suspended.

For minimizing the cost of large tables that are used to store transitory data, which does not need to be protected against failures because it can be reconstructed outside of Snowflake, the best table type to use isTransient. Transient tables in Snowflake are designed for temporary or transitory data storage and offer reduced storage costs compared to permanent tables. However, unlike temporary tables, they persist across sessions until explicitly dropped.

Why Transient Tables:Transient tables provide a cost-effective solution for storing data that is temporary but needs to be available longer than a single session. They have lower data storage costs because Snowflake does not maintain historical data (Time Travel) for as long as it does for permanent tables.

Creating a Transient Table:

To create a transient table, use theTRANSIENTkeyword in the CREATE TABLE statement:

CREATETRANSIENTTABLEmy_transient_table (...);

Use Case Considerations:Transient tables are ideal for scenarios where the data is not critical, can be easily recreated, and where cost optimization is a priority. They are suitable for development, testing, or staging environments where data longevity is not a concern.