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Message from discussion Selecting (max) OR identity field
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Henning  
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 More options Jun 8 2010, 4:19 am
From: Henning <hight...@gmail.com>
Date: Tue, 8 Jun 2010 01:19:05 -0700 (PDT)
Local: Tues, Jun 8 2010 4:19 am
Subject: Re: Selecting (max) OR identity field
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Diskspace is usually a non-issue. Harddrives is the cheapest component
you can buy.

Henning

On 8 Jun, 08:53, Michael Hawksworth <mghawkswo...@gmail.com> wrote:

> As a newbie to MongoDB myself I struggled with this for a while.

> Eventually I realised the only reason for using this was my MSSQL fixation
> (Interestingly the is a nasty bug in MSSQL Identity anyway) so I just
> started using an ObjectID field and everything seems fine (so far).

> OK uses somewhat more disk space but for my app that's not really an issue.

> Regards
> Michael Hawksworth

> On Tue, Jun 8, 2010 at 7:35 AM, Jørn Wildt <j...@fjeldgruppen.dk> wrote:
> > Check this request for some thoughts:
> >http://jira.mongodb.org/browse/SERVER-195

> > Beware of concurrency issues: two reades may read MAX() = 10 and then
> > both of them increment it to 11. You need to use MongoDB's various
> > atomic operation to ensure this operation is safe.

> > /Jørn

> > On Jun 8, 8:19 am, SaraC <sarajchi...@gmail.com> wrote:
> > > I'm new to NoSQL, I'm looking to either create an identity field (that
> > > starts at 0) or build my own by selecting a max value.

> > > I understand that the Mongo Ids are timestamps and can be used as
> > > such. However, I need a smaller value for this column.

> > > Thanks a bunch!

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