[ale] Auto increment in MySQL

[James P. Kinney III]

On Wed, 2005-09-14 at 23:14 -0400, James P. Kinney III wrote:
> On Wed, 2005-09-14 at 22:34 -0400, Christopher Fowler wrote:
> > On Wed, 2005-09-14 at 21:34 -0400, George Carless wrote:
> > > ALTER TABLE theTableInQuestion AUTO_INCREMENT=1234
> > > 
> > 
> > Here is a question.  Lets say that I have a bunch of holes because I
> > deleted various rows.  can I set the value to 1 and MySQL will be smart
> > enough to fill those holes?
> 
> No. The next available use will be 2, then 3 etc. You will wind up with
> duplicates.

This is total crap unless the version was running on stone tablets.
Please delete this and forget I babbled anything this incorrect.

need sleep. must code. need sleep. must code. need caffeine and sugar.
need sleep.

gets a beer and gives up.
> 
> If the auto-increment column is the primary index, you will see at the
> least errors and at the worst a crash (most likely during a routine
> reindex run after a series of inserts).
> 
> If you are flat out of numbers, you will need to either raise the
> MAX_SEQUENCE (I don't think that's the correct variable name and I'm not
> sure it's settable) or script a renumbering of the tables after a vacuum
> if the largest sequence number has already been hit. From Mysql pages:
> 
> 
> > When an AUTO_INCREMENT column runs out of values, InnoDB wraps a BIGINT
> >  to -9223372036854775808 and BIGINT UNSIGNED to 1. However, BIGINT
> >  values have 64 bits, so do note that if you were to insert one million
> >  rows per second, it would still take nearly three hundred thousand
> >  years before BIGINT reached its upper bound. With all other integer
> >  type columns, a duplicate-key error results. This is similar to how
> >  MyISAM works, because it is mostly general MySQL behavior and not
> >  about any storage engine in particular.
> > 
> 
> So the AUTO_INCREMENT process uses a 64bit Integer so running out is not
> really a big issue.
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-- 
James P. Kinney III          \Changing the mobile computing world/
CEO & Director of Engineering \          one Linux user         /
Local Net Solutions,LLC        \           at a time.          /
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GPG ID: 829C6CA7 James P. Kinney III (M.S. Physics)
<jkinney at localnetsolutions.com>
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