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Allow the specification of the isolation mode at the statement level
The programmer should be able to specify the isolation mode (committed read, dirty read, serializable etc.) at the statement level. I don't have a definitive idea on how to specify this in terms of syntax. It could be in a "clean" way like:
SELECT ... FROM ... WHERE... GROUP... SORT... WITH ISOLATION LEVEL COMMITTED READ LAST COMMITTED
or in a "dirty" way with the use of directives. This would have the same restrictions as Informix extension to the standard (since ANSI doesn't allow changing the isolation level within a transaction).
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