Configure Default Isolation for Your Session

Set Session Default Isolation Level

Write a PostgreSQL query to set the default transaction isolation level for the session to REPEATABLE READ.

Solution:

-- Set the session default isolation level to REPEATABLE READ.
SET SESSION CHARACTERISTICS AS TRANSACTION ISOLATION LEVEL REPEATABLE READ;

Explanation:

• Purpose of the Query:
• The goal is to change the default isolation level for all transactions in the current session.
• This demonstrates how to configure session-level isolation settings.
• Key Components:
• SET SESSION CHARACTERISTICS AS TRANSACTION ISOLATION LEVEL REPEATABLE READ; : Updates the session default.
• Real-World Application:
• Useful when multiple transactions in a session require a consistent snapshot without setting the level individually.

Notes:

• The change applies only for the current session.
• To revert, the session can be ended or the isolation level reset.

For more Practice: Solve these Related Problems:

• Write a PostgreSQL query to set the session default isolation level to REPEATABLE READ and then update a record in the Employees table.
• Write a PostgreSQL query to change the session default isolation level to SERIALIZABLE for all subsequent transactions in the session.
• Write a PostgreSQL query to set the session default isolation level to READ COMMITTED and verify the setting with a sample SELECT from the Orders table.
• Write a PostgreSQL query to adjust the session default isolation level to REPEATABLE READ and then begin a transaction to perform multiple data modifications.

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Previous PostgreSQL Exercise: Set Transaction Isolation Level to SERIALIZABLE.
Next PostgreSQL Exercise: Begin Transaction with Custom Isolation Level for Multiple Operations.