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Re: Holes in MYSQL Databases? [message #162780 is a reply to message #162221]

Thu, 15 July 2010 11:16

Ernesto

Messages: 413
Registered: August 2005

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Senior Member

The tables are auto incremental, which means that when you create a new user, that user gets the id after the last one created:

1
2
3
4
5

If you delete the user with userid 3, your table will looks like this
1
2
4
5

and when you create a new user, that user will have id 6
That is the way it HAS to be and any other design will fail horribly, because if you create a new user in "slot 3" all former references to the old user will appear in the new user, etc.

So yes, there will be "holes" but they are not harmful in any way shape or form. The only problem would occur if the "userid" field in your database is just a smallint which can only hold up to 32767 different IDs.

However, since this is 2010, noone uses tinyints in a database anymore, we use regular INT which can hold 2,147,483,647 different IDs

If the need should arise, we just increase that to a bigint which holds 9,223,372,036,854,775,807, but I doubt that you will have 2 billion posts anytime soon!

Ginnunga Gaming

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[Message index]

		Holes in MYSQL Databases? By: The Witcher on Fri, 09 April 2010 04:17
		Re: Holes in MYSQL Databases? By: Ernesto on Thu, 15 July 2010 11:16
		Re: Holes in MYSQL Databases? By: charleshbrenner on Sat, 28 September 2013 08:38

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