Auto-suspend and auto-resume in Snowflake - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to enable auto-suspend for a warehouse.

Snowflake

ALTER WAREHOUSE my_warehouse SET AUTO_SUSPEND = [1];

Drag options to blanks, or click blank then click option'

ATRUE

BON

C300

D60

Attempts:

3 left

💡 Hint

Common Mistakes

Using ON or TRUE instead of a number.

Setting AUTO_SUSPEND to 0 disables auto-suspend.

The AUTO_SUSPEND parameter expects a number representing seconds of inactivity before suspending the warehouse. 60 seconds is a common setting.

2fill in blank

medium

Complete the code to enable auto-resume for a warehouse.

Snowflake

ALTER WAREHOUSE my_warehouse SET AUTO_RESUME = [1];

Drag options to blanks, or click blank then click option'

ATRUE

BFALSE

C0

DOFF

Attempts:

3 left

💡 Hint

Common Mistakes

Using 0 or OFF instead of TRUE.

Confusing AUTO_RESUME with AUTO_SUSPEND.

AUTO_RESUME should be set to TRUE to allow the warehouse to automatically resume when a query is submitted.

3fill in blank

hard

Fix the error in the code to correctly set auto-suspend to 5 minutes.

Snowflake

ALTER WAREHOUSE my_warehouse SET AUTO_SUSPEND = [1];

Drag options to blanks, or click blank then click option'

A300

BTRUE

C5m

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using 5 instead of 300.

Using '5m' which is invalid syntax.

AUTO_SUSPEND expects seconds, so 5 minutes is 300 seconds.

4fill in blank

hard

Fill both blanks to set auto-suspend to 2 minutes and enable auto-resume.

Snowflake

ALTER WAREHOUSE my_warehouse SET AUTO_SUSPEND = [1], AUTO_RESUME = [2];

Drag options to blanks, or click blank then click option'

A120

BTRUE

CFALSE

D60

Attempts:

3 left

💡 Hint

Common Mistakes

Setting AUTO_SUSPEND to 2 instead of 120.

Setting AUTO_RESUME to FALSE or a number.

120 seconds equals 2 minutes for AUTO_SUSPEND, and AUTO_RESUME should be TRUE to enable auto-resume.

5fill in blank

hard

Fill all three blanks to create a warehouse with auto-suspend 90 seconds, auto-resume enabled, and size set to XSMALL.

Snowflake

CREATE WAREHOUSE my_warehouse WITH WAREHOUSE_SIZE = [1] AUTO_SUSPEND = [2] AUTO_RESUME = [3];

Drag options to blanks, or click blank then click option'

ASMALL

BXSMALL

CTRUE

D90

Attempts:

3 left

💡 Hint

Common Mistakes

Using SMALL instead of XSMALL for warehouse size.

Setting AUTO_SUSPEND to 90 as a string or invalid format.

Setting AUTO_RESUME to FALSE or a number.

WAREHOUSE_SIZE is set to XSMALL, AUTO_SUSPEND to 90 seconds, and AUTO_RESUME enabled with TRUE.

Practice

1. What is the main purpose of the auto-suspend feature in a Snowflake warehouse?

easy

A. To increase the warehouse size during peak hours

B. To automatically start the warehouse when a query is submitted

C. To automatically stop the warehouse after a period of inactivity to save costs

D. To backup warehouse data automatically

Solution

1. Step 1: Understand auto-suspend functionality

   Auto-suspend stops the warehouse when it is idle for a set time to avoid unnecessary charges.

2. Step 2: Differentiate from auto-resume

   Auto-resume starts the warehouse when a query runs, not auto-suspend.

3. Final Answer:

   To automatically stop the warehouse after a period of inactivity to save costs -> Option C

4. Quick Check:

   Auto-suspend = stops warehouse after inactivity [OK]

Hint: Auto-suspend stops idle warehouse to save money [OK]

Common Mistakes:

• Confusing auto-suspend with auto-resume
• Thinking auto-suspend increases warehouse size
• Assuming auto-suspend backs up data

2. Which of the following is the correct way to enable auto-resume for a Snowflake warehouse using SQL?

easy

A. ALTER WAREHOUSE my_wh SET AUTO_RESUME = TRUE;

B. ALTER WAREHOUSE my_wh SET AUTO_SUSPEND = TRUE;

C. CREATE WAREHOUSE my_wh AUTO_RESUME = ON;

D. ALTER WAREHOUSE my_wh ENABLE AUTO_RESUME;

Solution

1. Step 1: Recall correct syntax for enabling auto-resume

   The correct command uses ALTER WAREHOUSE with SET AUTO_RESUME = TRUE.

2. Step 2: Eliminate incorrect options

   ALTER WAREHOUSE my_wh SET AUTO_SUSPEND = TRUE; sets auto_suspend, not auto_resume. CREATE WAREHOUSE my_wh AUTO_RESUME = ON; uses wrong syntax for CREATE. ALTER WAREHOUSE my_wh ENABLE AUTO_RESUME; uses invalid command.

3. Final Answer:

   ALTER WAREHOUSE my_wh SET AUTO_RESUME = TRUE; -> Option A

4. Quick Check:

   Enable auto-resume with SET AUTO_RESUME = TRUE [OK]

Hint: Use ALTER WAREHOUSE ... SET AUTO_RESUME = TRUE to enable [OK]

Common Mistakes:

• Confusing AUTO_RESUME with AUTO_SUSPEND
• Using CREATE instead of ALTER for existing warehouse
• Using invalid commands like ENABLE AUTO_RESUME

3. Given this SQL command sequence:

ALTER WAREHOUSE my_wh SET AUTO_SUSPEND = 300;
ALTER WAREHOUSE my_wh SET AUTO_RESUME = TRUE;
-- Warehouse is currently suspended
SELECT CURRENT_WAREHOUSE();

What happens when the SELECT query runs?

medium

A. The warehouse automatically resumes and the query runs successfully

B. The query fails because the warehouse is suspended

C. The warehouse remains suspended and query waits indefinitely

D. The warehouse resumes but the query returns NULL

Solution

1. Step 1: Understand auto-resume behavior

   With AUTO_RESUME = TRUE, the warehouse starts automatically when a query runs.

2. Step 2: Apply to the SELECT query

   The warehouse is suspended but will resume automatically before executing the SELECT.

3. Final Answer:

   The warehouse automatically resumes and the query runs successfully -> Option A

4. Quick Check:

   Auto-resume starts warehouse on query run [OK]

Hint: Auto-resume starts suspended warehouse on query execution [OK]

Common Mistakes:

• Assuming query fails if warehouse is suspended
• Thinking warehouse stays suspended during query
• Believing query returns NULL when warehouse resumes

4. You set AUTO_SUSPEND = 0 and AUTO_RESUME = TRUE on a warehouse. What issue might occur?

medium

A. The warehouse suspends and resumes repeatedly every second

B. The warehouse suspends immediately and never resumes

C. The warehouse suspends after default 60 seconds

D. The warehouse never suspends, causing continuous charges

Solution

1. Step 1: Understand AUTO_SUSPEND = 0 meaning

   Setting AUTO_SUSPEND to 0 disables auto-suspend, so warehouse stays running.

2. Step 2: Consider AUTO_RESUME effect

   AUTO_RESUME = TRUE allows auto-start but does not suspend warehouse automatically.

3. Final Answer:

   The warehouse never suspends, causing continuous charges -> Option D

4. Quick Check:

   AUTO_SUSPEND=0 disables suspend, warehouse runs always [OK]

Hint: AUTO_SUSPEND=0 means warehouse never suspends [OK]

Common Mistakes:

• Thinking AUTO_SUSPEND=0 suspends immediately
• Assuming warehouse suspends after default time
• Believing warehouse cycles suspend/resume every second

5. You want to minimize costs by suspending a warehouse after 5 minutes of inactivity but ensure it resumes automatically when needed. Which configuration is best?

hard

A. Set AUTO_SUSPEND = 60 and AUTO_RESUME = FALSE

B. Set AUTO_SUSPEND = 300 and AUTO_RESUME = TRUE

C. Set AUTO_SUSPEND = 0 and AUTO_RESUME = FALSE

D. Set AUTO_SUSPEND = 600 and AUTO_RESUME = TRUE

Solution

1. Step 1: Choose auto-suspend time for 5 minutes

   5 minutes equals 300 seconds, so AUTO_SUSPEND = 300 is correct.

2. Step 2: Enable auto-resume for automatic start

   Setting AUTO_RESUME = TRUE ensures warehouse starts when queries run.

3. Final Answer:

   Set AUTO_SUSPEND = 300 and AUTO_RESUME = TRUE -> Option B

4. Quick Check:

   5 min suspend + auto-resume = AUTO_SUSPEND=300 & AUTO_RESUME=TRUE [OK]

Hint: Use 300 seconds for 5 min suspend and enable auto-resume [OK]

Common Mistakes:

• Using 0 for AUTO_SUSPEND disables suspend
• Disabling AUTO_RESUME causes manual start
• Setting suspend time too short or too long