17.4. Concurrent execution of composite operations
There is scope for concurrency in the execution of high-level, composite operation invocations.
Several high-level operations, invoked by different processes, could be run in parallel, their lower-level operations being interleaved.
It might be possible to invoke the suboperations of a single high-level operation in parallel.
Method 2 cannot be carried out automatically without regard to the semantics of the computation. It might be the case that some of the operations have to be invoked in a specific order. For example, debit might only be allowed after a check-balance operation but credit and debit can be carried out in parallel.
Current database programming languages tend to specify a strict ...
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