When a query in Snowflake is too large to fit into the available memory, it will start spilling to remote storage. This is an indication that the memory allocated for the query is insufficient for its execution, and as a result, Snowflake uses remote disk storage to handle the overflow. This spill to remote storage can lead to slower query performance due to the additional I/O operations required.
References:
* [COF-C02] SnowPro Core Certification Exam Study Guide
* Snowflake Documentation on Query Profile1
* Snowpro Core Certification Exam Flashcards2

* Disabling auto-suspend prevents a virtual warehouse from automatically shutting down during periods of inactivity, leading to increased credit consumption because the warehouse continues consuming resources even when idle.
* This can significantly raise costs, especially for underutilized warehouses.
References:
* Snowflake Documentation: Virtual Warehouses
* Snowflake Credit Management

The privileges granted to Snowflake's system-defined roles cannot be revoked. System-defined roles, such as SYSADMIN, ACCOUNTADMIN, SECURITYADMIN, and others, come with a set of predefined privileges that are essential for the roles to function correctly within the Snowflake environment. These privileges are intrinsic to the roles and ensure that users assigned these roles can perform the necessary tasks and operations relevant to their responsibilities.
The design of Snowflake's role-based access control (RBAC) model ensures that system-defined roles have a specific set of non-revocable privileges to maintain the security, integrity, and operational efficiency of the Snowflake environment. This approach prevents accidental or intentional modification of privileges that could disrupt the essential functions or compromise the security of the Snowflake account.
Reference:
Snowflake Documentation on Access Control: Understanding Role-Based Access Control (RBAC)

TheENABLE_ACCOUNT_DATABASE_REPLICATIONparameter is a critical setting in Snowflake that allows or restricts the replication of databases across Snowflake accounts. Given the significant impact of this parameter on data management and security, only theACCOUNTADMINrole has the minimum required privileges to set or modify it. This ensures that only users with the highest level of access and responsibility within the Snowflake environment can control database replication settings, maintaining strict governance and security standards.
References: Snowflake Documentation on Database Replication

The correct answer is C. Clustering .
Materialized views store precomputed results and can improve query performance. Snowflake also supports clustering with materialized views in applicable scenarios, which can further improve pruning and query performance.
Why C is correct:
A materialized view can be clustered to help optimize access patterns. Clustering can improve performance when queries filter or join on specific columns.
Why the other options are incorrect:
A). Time Travel is not the main supported feature associated with standard materialized views in this question.
B). Fail-safe applies to protected table data storage, not as a feature used directly with standard materialized views for query optimization.
D). Data sharing generally requires secure objects for sharing views. A standard materialized view is not the best answer for this question.
Official Snowflake documentation reference:
Snowflake documentation explains materialized view behavior and supports clustering considerations for materialized views.
Reference: Snowflake Documentation - Materialized views; Snowflake Documentation - Clustering materialized views; SnowPro Core Study Guide - Performance Optimization.