A transaction isolation level can be set by the developer by invoking the following SQL statement:
SET TRANSACTION ISOLATION LEVEL { SERIALIZABLE | REPEATABLE READ | READ COMMITTED | READ UNCOMMITTED}
The SET TRANSACTION ISOLATION LEVEL statement should be called inside a transaction block before any query, otherwise, it will have no effect. An alternative is to use the following syntax:
BEGIN TRANSACTION ISOLATION LEVEL { SERIALIZABLE | REPEATABLE READ | READ COMMITTED | READ UNCOMMITTED}
Finally, one can change the whole default database isolation level to SERIALIZABLE as follows:
ALTER DATABASE <DATABASE NAME> SET DEFAULT_TRANSACTION_ISOLATION TO SERIALIZABLE ;
As shown by the preceding SQL statement, the transaction ...
