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.
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
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 🙂