Creating and managing shares in Snowflake - Quick Revision & Summary

Recall & Review

beginner

What is a share in Snowflake?

A share in Snowflake is a way to securely share database objects like tables and views with other Snowflake accounts without copying data.

beginner

How do you create a share in Snowflake?

Use the SQL command: CREATE SHARE share_name; This creates an empty share to which you can add database objects.

intermediate

How do you add a table to a share?

Use ALTER SHARE share_name ADD TABLE database_name.schema_name.table_name; to add a table to the share.

intermediate

What is the difference between a share and a database clone in Snowflake?

A share allows data access without copying data, while a clone creates a full copy of the database or table.

beginner

How do you revoke access to a share?

Use DROP SHARE share_name; to remove the share and revoke access from all consumers.

Which command creates a new share in Snowflake?

A CREATE SHARE my_share;

B CREATE DATABASE my_share;

C CREATE TABLE my_share;

D CREATE SCHEMA my_share;

The correct command to create a share is CREATE SHARE followed by the share name.

How do you add a table named 'sales' in schema 'public' of database 'db1' to a share called 'share1'?

A CREATE SHARE share1 ADD TABLE sales;

B ALTER DATABASE db1 ADD TABLE sales TO share1;

C ALTER SHARE share1 ADD TABLE db1.public.sales;

D GRANT SELECT ON TABLE sales TO share1;

You add a table to a share using ALTER SHARE with ADD TABLE and the full table path.

What happens when you DROP a share in Snowflake?

A The share is paused but data remains accessible.

B The share is removed and all consumers lose access.

C The data in the share is deleted.

D The share is converted to a clone.

Dropping a share removes it and revokes access for all consumers, but does not delete the underlying data.

Which of the following is NOT a valid object to add to a share?

A Stored procedure

B Table

C File format

D View

Stored procedures cannot be shared; only tables, views, and some other objects can be added to shares.

What is the main benefit of using shares in Snowflake?

A Encrypting data automatically

B Creating backups of data

C Improving query speed

D Sharing data without copying it

Shares allow secure data sharing without duplicating data, saving storage and time.

Explain the steps to create a share and add a table to it in Snowflake.

Think about first creating an empty share, then adding objects to it.

Describe how Snowflake shares differ from cloning databases or tables.

Focus on data duplication and access differences.

Practice

1. What is the primary purpose of creating a share in Snowflake?

easy

A. To move data from one database to another

B. To create a backup of your data

C. To share data with other accounts without copying it

D. To encrypt data for security

Solution

1. Step 1: Understand the concept of shares in Snowflake

   Shares allow data to be shared between accounts without duplicating the data itself.

2. Step 2: Identify the main use case of shares

   Sharing data without copying saves storage and ensures data consistency.

3. Final Answer:

   To share data with other accounts without copying it -> Option C

4. Quick Check:

   Shares = Data sharing without copying [OK]

Hint: Shares share data directly, no copying needed [OK]

Common Mistakes:

• Thinking shares create data backups
• Confusing shares with data movement
• Assuming shares encrypt data automatically

2. Which Snowflake command correctly creates a share named my_share?

easy

A. ADD SHARE my_share;

B. MAKE SHARE my_share;

C. NEW SHARE my_share;

D. CREATE SHARE my_share;

Solution

1. Step 1: Recall the syntax for creating shares in Snowflake

   The correct command to create a share is CREATE SHARE <share_name>;.

2. Step 2: Compare options with correct syntax

   Only CREATE SHARE my_share; uses the correct CREATE SHARE syntax.

3. Final Answer:

   CREATE SHARE my_share; -> Option D

4. Quick Check:

   CREATE SHARE = correct command [OK]

Hint: Use CREATE SHARE to start a new share [OK]

Common Mistakes:

• Using MAKE or NEW instead of CREATE
• Forgetting the semicolon at the end
• Confusing ADD SHARE with creating

3. Given the commands:

CREATE SHARE my_share;
GRANT USAGE ON DATABASE sales_db TO SHARE my_share;
ALTER SHARE my_share ADD ACCOUNTS = ('account_123');

What does account_123 gain access to?

medium

A. Full access to all objects in sales_db

B. Only metadata about sales_db

C. Usage access to the sales_db database objects shared

D. No access until a role is granted

Solution

1. Step 1: Analyze the GRANT USAGE ON DATABASE to share

   Granting USAGE on a database to a share allows consumers to view database metadata (e.g., SHOW DATABASES, USE DATABASE) but not schemas, tables, or other internal objects.

2. Step 2: Understand the effect of adding accounts

   Adding account_123 to the share provides access limited to the granted privileges: database metadata only, as no schema or table privileges are granted.

3. Final Answer:

   Only metadata about sales_db -> Option B

4. Quick Check:

   GRANT USAGE ON DATABASE = metadata access only [OK]

Hint: GRANT USAGE on DB shares DB metadata only; need schema/table grants for data [OK]

Common Mistakes:

• Assuming full access to all objects in sales_db
• Thinking DB USAGE grants access to internal objects like tables
• Believing roles must be granted separately

4. You run:

CREATE SHARE my_share;
GRANT SELECT ON TABLE sales TO SHARE my_share;

But get an error. What is the likely cause?

medium

A. The table name must be fully qualified with database and schema

B. Shares cannot have privileges granted directly on tables

C. You need to add accounts to the share before granting privileges

D. You must grant privileges on the database, not the table

Solution

1. Step 1: Check the syntax for granting privileges on objects to shares

   Privileges on tables must be granted using fully qualified names: database.schema.table.

2. Step 2: Identify the missing qualification in the command

   The command uses just sales without database and schema, causing an error.

3. Final Answer:

   The table name must be fully qualified with database and schema -> Option A

4. Quick Check:

   Fully qualify table names when granting [OK]

Hint: Always use database.schema.table for grants [OK]

Common Mistakes:

• Granting on database instead of table
• Trying to grant privileges before adding accounts
• Assuming shares can't have table privileges

5. You want to share specific tables from two different databases with multiple accounts. Which approach is best?

hard

A. Create separate shares per database and add accounts to each share accordingly

B. Create one share, grant usage on both databases, and add all tables to it

C. Copy tables into one database, then create a single share

D. Grant privileges directly to accounts without using shares

Solution

1. Step 1: Understand share scope and management

   Shares are scoped to a single database, so sharing tables from different databases requires separate shares.

2. Step 2: Evaluate options for managing multiple accounts and databases

   Creating separate shares per database allows clear control and easier management of access.

3. Step 3: Consider drawbacks of other options

   Copying tables wastes storage; granting privileges directly is less secure and scalable.

4. Final Answer:

   Create separate shares per database and add accounts to each share accordingly -> Option A

5. Quick Check:

   Shares are per database, use multiple shares [OK]

Hint: Use one share per database for multi-db sharing [OK]

Common Mistakes:

• Trying to share multiple databases in one share
• Copying data instead of sharing
• Granting privileges directly to accounts bypassing shares