> We have a considerable amount of data, and have not noticed any visible
> speed issues with using GUID PK's in Firebird. Then again, we don't just
> pull back 1 million records simply to find one record. We query only for
> what we need - which greatly improves performance. And we use hard-coded
> visitor of course. The benefits of GUID's also far outweigh the cons of
> using other PK's types.
>
> I think today's databases are intelligent enough to correctly handle any
> types of data (even if it is used for the PK or part of the PK).

HI,

I am also worry about the performance but now not the select but insert.
Since the way I generate the GUID like PK will not be sequentially increment 
to the last record.
eg.
last GUID PK for the new record will be 1BCF4-...
now the new GUID PK may be 112N2-...
next may be whatever, so it may lead to frequently index page split? 




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