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What is Optimistic Concurrency Control?

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What is Optimistic Concurrency Control?

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Profile photo of LindseyMyer LindseyMyer

The container uses optimistic or pessimistic concurrency to control the behavior of multiple transactions accessing the same data.

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Profile photo of LindseyMyer LindseyMyer

See details on http://cwiki.apache.org/confluence/display/TUSCANY/OptimisticConcurrencyControl By default OCC is ON. With this, in generated UPDATE statement, any column undergoing change also gets included in the WHERE clause. Other than that, in DAS Config, in

element , the element can have two boolean attributes:- managed(default true), collision When collision=true for a column, during UPDATE statement generation, that column is included in the WHERE clause. When managed=true for a column, during UPDATE statement generation, that column (needs to be BigDecimal) value is incremented by 1 and used in the SET clause in UPDATE. managed=true, is effective only when collision=true, else managed attribute value is ignored.

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