How to change the default isolation level of a transaction in a stored procedure in PostgreSQL PL/pgSQL?

All we need is an easy explanation of the problem, so here it is.

I am interested in controlling the isolation level of a transaction inside a PostgreSQL procedure but haven’t found any information on how to do it. The documentation on Transaction Management within Chapter 42. PL/pgSQL — SQL Procedural Language only states that:

A new transaction starts out with default transaction characteristics such as transaction isolation level.

Can we change the default isolation level? Can you provide example code?

How to solve :

I know you bored from this bug, So we are here to help you! Take a deep breath and look at the explanation of your problem. We have many solutions to this problem, But we recommend you to use the first method because it is tested & true method that will 100% work for you.

Method 1

That should be simple:

ALTER PROCEDURE myproc
   SET default_transaction_isolation = 'repeatable read';

The downside to that is that because of the limitations of transaction management inside procedures, you can no longer COMMIT or ROLLBACK inside such a procedure.

If you need that, you could start the procedure body like this:

COMMIT;  -- otherwise you get a silly error
SET TRANSACTION ISOLATION LEVEL REPEATABLE READ;

Transaction management inside procedures is pretty limited at the moment.

Note: Use and implement method 1 because this method fully tested our system.
Thank you 🙂

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