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To ensure that system overhead is kept to a minimum, the system attempts to optimize NCL execution in many ways. One technique is that of sharing concurrent requests for a procedure of the same name, in such a way that only one copy of the procedure is loaded into storage. This technique also lets you specify a retention queue on which a completed procedure is retained, on the assumption that it can be reused within a short period. This eliminates the need to perform disk I/O to bring the procedure into storage again.
For extremely high usage procedures, you can use a technique known as preloading to ensure that the procedure remains in storage at all times, regardless of its pattern of use. These options are selected by the LOAD command.
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