View isolation level for a query in mysql

Question

How do I determine the isolation level in use for a given query? After a query is executed (by a 3rd party application) I\'d like to know which isolation level was used (e.g

Answer 1

SHOW VARIABLES LIKE 'tx_isolation';

or if you have MySQL 5.1+

SELECT * FROM information_schema.session_variables
WHERE variable_name = 'tx_isolation';

If you want to know what the server has configured globally, change the above to the following:

SHOW GLOBAL VARIABLES LIKE 'tx_isolation';

or if you have MySQL 5.1+

SELECT * FROM information_schema.global_variables
WHERE variable_name = 'tx_isolation';

If you want to make the query reveal what transaction isolation is being used, run this:

SELECT variable_value IsolationLevel
FROM information_schema.session_variables
WHERE variable_name = 'tx_isolation';

DISCLAIMER : I DO NOT KNOW EF4

If you are allowed to embed subqueries in the SQL about to be run by EF4, you may have to embed this query as a subquery (or embed you query as a subquery) and display the variable IsolationLevel along with the results of the actual query.