The internal sort is often large because it has such a benefit.
2.
For example, an internal sort of 1024 records will save 9 passes.
3.
Language enhancements included a high-speed internal sort routine, do-while blocks, and the ability to step backwards through an indexed file.
4.
Instead of starting with very short runs, usually a hybrid algorithm is used, where the initial pass will read many records into memory, do an internal sort to create a long run, and then distribute those long runs onto the output set.
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