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Database / Snowflake Interview Questions

What is Resource Monitor in Snowflake and how do you use it to control credit consumption?

A Resource Monitor is a named Snowflake object that watches credit consumption for one or more Virtual Warehouses (or the entire account) and automatically takes action when configurable thresholds are crossed. It is the primary guardrail against runaway warehouse spend — for example, preventing a poorly-written query or a forgotten warehouse from consuming an entire month's budget.

A Resource Monitor defines a credit quota (the total credits allowed within the reset period) and one or more threshold triggers (expressed as percentages of the quota). Each trigger has an action:

  • NOTIFY — sends an email alert to the monitor's notification list but takes no action against the warehouse.
  • SUSPEND — suspends the warehouse after all currently running queries complete.
  • SUSPEND_IMMEDIATE — immediately kills all running queries and suspends the warehouse without waiting.

Reset schedule: DAILY, WEEKLY, MONTHLY, or YEARLY — the quota resets on this cadence. Monitors can be set at account level (applies to all warehouses) or assigned to individual warehouses.

-- Create a Resource Monitor: 500 credits/month, suspend at 90%, alert at 75%
CREATE RESOURCE MONITOR monthly_budget
  CREDIT_QUOTA = 500
  FREQUENCY    = MONTHLY
  START_TIMESTAMP = IMMEDIATELY
  TRIGGERS
    ON 75 PERCENT DO NOTIFY
    ON 90 PERCENT DO SUSPEND
    ON 100 PERCENT DO SUSPEND_IMMEDIATE;

-- Attach the monitor to a specific warehouse
ALTER WAREHOUSE reporting_wh SET RESOURCE_MONITOR = monthly_budget;
What does the SUSPEND_IMMEDIATE action on a Resource Monitor threshold do to the warehouse?
At which two levels can a Snowflake Resource Monitor be applied?

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