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4 Answers

Kerry Moorman

1/4/2008 12:20:00 AM

0

Jonathan,

So you are saying that you generally handle concurrency with the "last in
wins" strategy?

Kerry Moorman


"Jonathan Wood" wrote:

> If I want to set a field to a specific value, I can just set it. If it
> overrides another update, that's fine because someone set the value after
> someone else.
>
> On the other hand, if I want to increment a value, say, 10, it's possible
> that two users read the old value, the first one writes an 11 and then the
> second one writes an 11. In this case, the second update was not an
> increment, as expected.
>
> --
> Jonathan Wood
> SoftCircuits Programming
> http://www.softci...
>
> "Kerry Moorman" <KerryMoorman@discussions.microsoft.com> wrote in message
> news:EF5713A9-77FC-48F3-8A18-BDDDCEF940AF@microsoft.com...
> > Jonathan,
> >
> > I don't understand how this particular example would need to be handled
> > any
> > differently than your normal concurrency handling.
> >
> > Kerry Moorman
> >
> >
> > "Jonathan Wood" wrote:
> >
> >> I have a numeric field. Users will modify it by adding a value to it.
> >>
> >> But I'm a little concerned about the unlikely event where two users are
> >> incrementing it at the same time. Unless there is some sort of lock
> >> between
> >> the time the old value is read and the sum of the two values is written,
> >> one
> >> change could override another.
> >>
> >> Any suggestions?
> >>
> >> Thanks.
> >>
> >> --
> >> Jonathan Wood
> >> SoftCircuits Programming
> >> http://www.softci...
> >>
> >>
>
>

Jonathan Wood

1/4/2008 4:52:00 AM

0

Kerry,

> So you are saying that you generally handle concurrency with the "last in
> wins" strategy?

Why not? If someone wants to set a field to one value, and someone later
wants to set it to another (even if only milliseconds later), why should I
prevent the field from being changed just because it had been changed
earlier?

Jonathan

Kerry Moorman

1/4/2008 1:42:00 PM

0

Jonathan,

Of course "last in wins" is a valid strategy for some applications. I am
always interested in understanding just how that strategy is actually used.

When a user retrieves a row from a database table and changes one or two
columns of data in that row, does your app track which columns have been
changed and only update those columns in that row in the table? Or does your
app, in the process of updating the row in the table, re-write the unchanged
columns to the table in addition to updating the changed columns?

Kerry Moorman

"Jonathan Wood" wrote:

> Kerry,
>
> > So you are saying that you generally handle concurrency with the "last in
> > wins" strategy?
>
> Why not? If someone wants to set a field to one value, and someone later
> wants to set it to another (even if only milliseconds later), why should I
> prevent the field from being changed just because it had been changed
> earlier?
>
> Jonathan
>
>

Jonathan Wood

1/4/2008 7:58:00 PM

0

Kerry,

> Of course "last in wins" is a valid strategy for some applications. I am
> always interested in understanding just how that strategy is actually
> used.

Well, isn't the alternative that "first in wins?" For me, I don't want to
prevent an update or raise an error unless I have a specific reason for
doing so.

> When a user retrieves a row from a database table and changes one or two
> columns of data in that row, does your app track which columns have been
> changed and only update those columns in that row in the table? Or does
> your
> app, in the process of updating the row in the table, re-write the
> unchanged
> columns to the table in addition to updating the changed columns?

Well, for the issue that raised this question, I'm only updating a single
field.

For cases where I'm updating entire records, I can see it's a little more
difficult. I'd need to think about it when I get there as I'm pretty new to
this.


> Kerry Moorman
>
> "Jonathan Wood" wrote:
>
>> Kerry,
>>
>> > So you are saying that you generally handle concurrency with the "last
>> > in
>> > wins" strategy?
>>
>> Why not? If someone wants to set a field to one value, and someone later
>> wants to set it to another (even if only milliseconds later), why should
>> I
>> prevent the field from being changed just because it had been changed
>> earlier?
>>
>> Jonathan
>>
>>

--
Jonathan Wood
SoftCircuits Programming
http://www.softci...