Snowpipe for event-driven loading in Snowflake - Step-by-Step Execution

Process Flow - Snowpipe for event-driven loading

New file arrives in cloud storage

↓

Cloud event triggers notification

↓

Snowpipe receives event

↓

Snowpipe loads new data into table

↓

Data available for queries

↓

END

Snowpipe listens for new files in cloud storage via events, then automatically loads data into Snowflake tables.

Execution Sample

Snowflake

CREATE PIPE my_pipe
  AUTO_INGEST = TRUE
  INTEGRATION = my_notification_integration
  AS COPY INTO my_table
  FROM @my_stage
  FILE_FORMAT = (TYPE = 'CSV');

This code creates a Snowpipe that automatically loads CSV files from a stage into a table when new files arrive.

Process Table

Step	Event	Snowpipe Action	Data State	Notes
1	File uploaded to cloud storage	No action yet	No new data in table	Waiting for event
2	Cloud event sent to Snowpipe	Snowpipe receives event	No new data in table	Trigger received
3	Snowpipe starts loading file	COPY INTO runs	Data loading in progress	File being processed
4	Load completes successfully	Data loaded into table	New data available	Ready for queries
5	No new files	No action	Data unchanged	Idle state

💡 No new files to load, Snowpipe waits for next event

Status Tracker

Variable	Start	After Step 2	After Step 3	After Step 4	Final
File in storage	Absent	Present	Present	Present	Present
Snowpipe status	Idle	Triggered	Loading	Completed	Idle
Table data	Old data only	Old data only	Loading data	New data added	New data present

Key Moments - 3 Insights

Why doesn't Snowpipe load data immediately when a file is uploaded?

Snowpipe waits for a cloud event notification (see Step 2 in execution_table) before starting to load data.

What happens if the file load fails during Snowpipe processing?

Snowpipe retries loading the file until success or manual intervention; this is not shown in the simple flow but is part of Snowpipe's reliability.

Can Snowpipe load multiple files at once?

Yes, Snowpipe can process multiple events and load files concurrently, but each event triggers a separate load operation.

Visual Quiz - 3 Questions

Look at the execution_table, at which step does Snowpipe start loading the file?

A Step 3

B Step 2

C Step 1

D Step 4

💡 Hint

Check the 'Snowpipe Action' column for when 'COPY INTO runs'

According to variable_tracker, what is the Snowpipe status after Step 4?

A Loading

B Triggered

C Completed

D Idle

💡 Hint

Look at 'Snowpipe status' value under 'After Step 4'

If no new files arrive, what does Snowpipe do according to the execution_table?

A Starts loading old files

B Waits idle with no action

C Deletes old data

D Sends error notification

💡 Hint

See Step 5 'Snowpipe Action' and 'Notes' columns

Concept Snapshot

Snowpipe automatically loads data into Snowflake tables when new files arrive in cloud storage.
It listens for cloud event notifications to trigger loading.
Use CREATE PIPE with AUTO_INGEST=TRUE to enable event-driven loading.
Snowpipe runs COPY INTO commands behind the scenes.
Data becomes available for queries immediately after loading.
Snowpipe handles retries and scales with file arrivals.

Full Transcript

Snowpipe is a Snowflake feature that loads data automatically when new files arrive in cloud storage. The process starts when a file is uploaded, which triggers a cloud event notification. Snowpipe listens for this event and then runs a COPY INTO command to load the data into a Snowflake table. After loading completes, the new data is available for queries. If no new files arrive, Snowpipe remains idle, waiting for the next event. This event-driven loading helps keep data fresh without manual intervention.

Practice

1. What is the main purpose of Snowpipe in Snowflake?

easy

A. To manually run SQL queries on data

B. To automatically load data when new files arrive in cloud storage

C. To create visual dashboards from data

D. To backup Snowflake databases

Solution

1. Step 1: Understand Snowpipe's role

   Snowpipe is designed to automate data loading triggered by new files in cloud storage.

2. Step 2: Compare options

   Options A, C, and D describe other tasks not related to Snowpipe's automatic loading feature.

3. Final Answer:

   To automatically load data when new files arrive in cloud storage -> Option B

4. Quick Check:

   Snowpipe = automatic data loading [OK]

Hint: Snowpipe triggers loading automatically on new files [OK]

Common Mistakes:

• Confusing Snowpipe with manual query execution
• Thinking Snowpipe creates dashboards
• Assuming Snowpipe is for backups

2. Which Snowpipe option enables event-driven automatic loading?

easy

A. MANUAL_TRIGGER = TRUE

B. AUTO_LOAD = FALSE

C. AUTO_INGEST = TRUE

D. EVENT_NOTIFY = OFF

Solution

1. Step 1: Identify the correct Snowpipe setting

   The setting AUTO_INGEST = TRUE enables event-driven automatic loading in Snowpipe.

2. Step 2: Eliminate incorrect options

   Options A, B, and D either disable loading or do not exist as valid Snowpipe settings.

3. Final Answer:

   AUTO_INGEST = TRUE -> Option C

4. Quick Check:

   AUTO_INGEST = TRUE enables event-driven loading [OK]

Hint: AUTO_INGEST = TRUE turns on event-driven loading [OK]

Common Mistakes:

• Using AUTO_LOAD instead of AUTO_INGEST
• Confusing manual trigger with automatic
• Turning event notifications off

3. Given this Snowpipe command:

CREATE PIPE my_pipe AUTO_INGEST = TRUE AS
 COPY INTO my_table FROM @my_stage FILE_FORMAT = (TYPE = 'CSV');

What happens when a new CSV file is added to @my_stage?

medium

A. The file is automatically loaded into my_table

B. The file is ignored until manual load is triggered

C. An error occurs because AUTO_INGEST is not supported

D. The file is deleted from the stage

Solution

1. Step 1: Analyze the pipe creation

   The pipe is created with AUTO_INGEST = TRUE, meaning it listens for new files in the stage and loads them automatically.

2. Step 2: Understand the COPY INTO command

   The COPY INTO command loads data from the stage files into my_table using CSV format.

3. Final Answer:

   The file is automatically loaded into my_table -> Option A

4. Quick Check:

   New file + AUTO_INGEST = TRUE triggers load [OK]

Hint: AUTO_INGEST = TRUE pipes auto-load new files [OK]

Common Mistakes:

• Thinking manual load is needed
• Believing AUTO_INGEST is unsupported
• Assuming files get deleted automatically

4. You created a Snowpipe with AUTO_INGEST = TRUE but new files are not loading automatically. What is a likely cause?

medium

A. Cloud storage event notifications are not configured properly

B. The pipe was created without specifying a table

C. AUTO_INGEST must be set to FALSE for automatic loading

D. Snowpipe does not support CSV file formats

Solution

1. Step 1: Check event notification setup

   Snowpipe requires cloud storage event notifications to trigger automatic loading when AUTO_INGEST = TRUE.

2. Step 2: Review other options

   The pipe was created without specifying a table is invalid because pipe creation requires a target table. AUTO_INGEST must be set to FALSE for automatic loading is wrong since AUTO_INGEST = TRUE enables automatic loading. Snowpipe does not support CSV file formats is false; CSV is supported.

3. Final Answer:

   Cloud storage event notifications are not configured properly -> Option A

4. Quick Check:

   Missing event notifications block auto-load [OK]

Hint: Check cloud event notifications for AUTO_INGEST pipes [OK]

Common Mistakes:

• Setting AUTO_INGEST to FALSE expecting auto-load
• Ignoring cloud event notification setup
• Thinking CSV format is unsupported

5. You want to set up Snowpipe to load JSON files automatically into a table. Which sequence of steps is correct?

hard

A. Create a file format for CSV, create a pipe with AUTO_INGEST=TRUE, then upload JSON files

B. Create a pipe first, then create a stage and file format after uploading files

C. Upload files to the table directly, then create a pipe with AUTO_INGEST=FALSE

D. Create a file format for JSON, create a stage, create a pipe with AUTO_INGEST=TRUE, then upload files to the stage

Solution

1. Step 1: Prepare file format and stage

   Define a JSON file format and create a stage to hold files before loading.

2. Step 2: Create pipe with AUTO_INGEST=TRUE

   Create the pipe referencing the stage and file format, enabling automatic loading on new files.

3. Step 3: Upload JSON files to the stage

   Uploading files triggers Snowpipe to load data automatically into the target table.

4. Final Answer:

   Create a file format for JSON, create a stage, create a pipe with AUTO_INGEST=TRUE, then upload files to the stage -> Option D

5. Quick Check:

   File format + stage + pipe + upload = auto-load [OK]

Hint: Set file format and stage before pipe with AUTO_INGEST [OK]

Common Mistakes:

• Creating pipe before stage and file format
• Uploading files directly to table
• Using CSV format for JSON files