Revert Session Isolation to Standard Settings

Reset Session Isolation Level to Default

Write a PostgreSQL query to reset the session's transaction isolation level back to the default (typically READ COMMITTED).

Solution:

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

Explanation:

• Purpose of the Query:
• The goal is to restore the session's isolation level to the standard setting after using a custom level.
• This demonstrates how to revert changes to session-wide configuration.
• Key Components:
• SET SESSION CHARACTERISTICS AS TRANSACTION ISOLATION LEVEL READ COMMITTED; resets the level.
• Real-World Application:
• Useful after performing specific transactions that required higher isolation, ensuring subsequent transactions follow standard behavior.

Notes:

• Changing the session default affects all new transactions in that session.
• Always verify the desired isolation level for critical operations.

For more Practice: Solve these Related Problems:

• Write a PostgreSQL query to reset the session isolation level to READ COMMITTED after performing transactions with a custom isolation level.
• Write a PostgreSQL query to change the session default isolation level to READ COMMITTED and then start a new transaction that reflects this setting.
• Write a PostgreSQL query to set the session isolation level back to READ COMMITTED and verify the change by querying current session settings.
• Write a PostgreSQL query to reset the session isolation level to the system default and perform a test query to ensure it is applied.

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Previous PostgreSQL Exercise: Preventing Lost Updates with REPEATABLE READ.