Merge and shrink reform decision index

Hello

I just wanted to know, have we not all orders with the thumb of rule / threshold, when to consider merging and shrink. As for rebuild blevel > 3%.

Thank you.

Have you finished reading the presentation of Richard Foote? Don't think about anything until you have, you will waste a lot of time and resources otherwise.

Unless you can give some clear evidence and the explanation behind these formulas then I would well clear. It must be recognized that space in the index can be recovered as the space in a table, the only difference is that the values inserted must adapt (value wise) in space. And even when you don't naturally reuse space, it is usually quite indifferent.

Blevel is not a percentage, it is a whole number. It would take something substantial to increase the blevel of an index beyond how it was when the index was built. reconstruction of the index in most cases will keep this higher blevel and in other circumstances it won't take too long for the blevel to increase again if you don't win anything at the expense of the extra work.

Tags: Database

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