Re: [Gnumed-devel] Comments on 0.2

[Karsten Hilbert]

On Fri, Jun 23, 2006 at 12:21:49PM +0800, Syan Tan wrote:

> hashing also begs the question of what do you hash?
Which is IMO one of the two important reasons a hash won't
work well. The other one is performance.

> for different data types, and different for different versions,
Well, the hash would have to be over a concatenation of all
columns casted to text.

> client hashed on a ,b  , y and his hashed on a , b, x because it 's a new
> version made at a different time, in a different place etc... 
Well, because of that the hash generation would have to take
place in the backend by means of a trigger updating a hash
column which would then be matched against just like XMIN.

> sequence numbers are pretty simple in comparison.
Yes, such as XMIN.

Karsten
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