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Registry Defragmenter

This is out of curiosity, but I saw several (and some of them very popular) programs called registry defragmentation. Although I see what benefits they offer, I’m very curious how exactly you do registry defragmentation? Please note that I am not asking for the name of the software, just a basic description of how this is done programmatically. I understand that there is a disk defragmenter from Microsoft. Is that what they use? Or is there a registry defrag api?

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While disk defragmentation would be useful, a more important advantage of the speed that could be obtained would be the creation of registry nodes so that a typical depth search would place nodes with sequential access on the same registry page.

I do not know any API for this. An algorithm is a simple reordering and rewriting operation, difficult when working with simultaneous Windows access.

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I suspect that they simply defragment the files used to store registry data. Because registry files open during normal Windows normal operation, the “normal” file defrag tool will not even touch them.

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: RegSaveKey RegReplaceKey, Windows.

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Source: https://habr.com/ru/post/1768311/

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