14.09.2015 11:00, Helen Borrie wrote:
> According to both editions of The Firebird Book, for read/write read 
> committed transactions, RECORD_VERSION is the default.
 > According to the Firebird 2.5 Language Reference, NO RECORD_VERSION is the 
 > default.
>
> So - which is it?  Did it change at some point?  If so, at which 
> release/sub-release?

   NO RECORD_VERSION is the default for READ COMMITTED and it was not changed 
since FB 0.x times.
I.e. if TPB containts "isc_tpb_read_committed" tag and contains nor 
isc_tpb_rec_version, nor
isc_tpb_no_rec_version, engine will create READ COMMITTED NO RECORD_VERSION 
transaction.

Regards,
Vlad

PS Some client access components/drivers have its own defaults.

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