Handling load errors in Snowflake - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a common cause of load errors in Snowflake?

Load errors often happen because of data format issues, like wrong file structure or unexpected characters.

beginner

How does Snowflake help identify load errors?

Snowflake provides error tables and detailed error messages that show which rows failed and why.

intermediate

What is the role of the 'VALIDATION_MODE' option in Snowflake data loading?

It lets you check data for errors without actually loading it, so you can fix problems before the real load.

intermediate

Why use the 'ON_ERROR' parameter during data loading in Snowflake?

It controls what happens when errors occur, like skipping bad rows or stopping the load to fix issues.

advanced

How can you automate handling load errors in Snowflake?

By using error tables and scripts to review and fix errors, then reload only the problematic data.

What does Snowflake do when you set ON_ERROR='SKIP_FILE' during a load?

A Skips the entire file if an error occurs

B Stops loading and reports the error

C Loads all data ignoring errors

D Retries loading the file automatically

ON_ERROR='SKIP_FILE' tells Snowflake to skip the whole file if any error is found.

Which Snowflake feature helps you see which rows failed during loading?

A Error tables

B Data masking

C Virtual warehouses

D Streams

Error tables store details about rows that failed to load, helping you find and fix issues.

What does VALIDATION_MODE='RETURN_ERRORS' do?

A Loads data and ignores errors

B Loads data and stops on first error

C Deletes bad data automatically

D Checks data and returns errors without loading

It validates data and returns errors but does not load the data, allowing you to fix problems first.

If you want to load data but skip only bad rows, which ON_ERROR setting should you use?

A SKIP_ROW

B ABORT_STATEMENT

C CONTINUE

D SKIP_FILE

ON_ERROR='CONTINUE' skips only the rows with errors and loads the rest.

What is the best practice after identifying load errors in Snowflake?

A Ignore errors and continue loading

B Fix errors and reload only the bad data

C Delete the whole table and reload

D Load data without validation

Fixing errors and reloading only the problematic data saves time and keeps data clean.

Explain how Snowflake handles load errors and the options available to control error behavior.

Think about how Snowflake lets you see errors and decide what to do with bad data.

Describe a step-by-step approach to manage and fix load errors in Snowflake.

Imagine you are fixing a broken recipe step by step.