Ah - thanks for clarifying this. :-) Thomas
On 13 Sep., 14:18, Fabio Maulo <[email protected]> wrote: > Not "each entity" but "each persister"... or "each root-entity" > > > > > > On Mon, Sep 13, 2010 at 4:44 AM, Thomas Koch <[email protected]> wrote: > > Well, using NHProf (why didn't I think of that before?) > > > So to answer my own question "no there is no reace condition" > > > Details: > > > 1) > > begin transaction with isolation level: Unspecified > > > 2) > > Reading high value: > > select next_hi > > from hibernate_unique_key with (updlock ,rowlock) > > > 3) > > Updating high value: > > update hibernate_unique_key > > set next_hi = 1590 /* @p0 */ > > where next_hi = 1589 /* @p1 */ > > > 4) > > Reading high value: > > select next_hi > > from hibernate_unique_key with (updlock ,rowlock) > > > 5) > > Updating high value: > > update hibernate_unique_key > > set next_hi = 1591 /* @p0 */ > > where next_hi = 1590 /* @p1 */ > > > 6) > > Inserting my order > > > 7) > > Insert an address > > > 8) > > commit transaction > > > The reason I am seeing two updates of the key table is that each > > entity gets its own high value. > > > Thomas > > > On 10 Sep., 14:05, Fabio Maulo <[email protected]> wrote: > > > since the source of "high" is concentrated in one place.... ;) > > > > On Fri, Sep 10, 2010 at 8:58 AM, Thomas Koch <[email protected]> wrote: > > > > Hi - I use the hi-lo generator for my domain and have a question > > > > regarding its use in multiple processes. > > > > > I have a WCF project that is the primary power behind generating > > > > entities and saving them to the database with NHibernate and HI-LO. I > > > > also have an administrative application that sometimes generate > > > > entities for the domain. > > > > > Since these two applications live en separate processes, is there a > > > > risk here of them creating overlapping id's ? > > > > > As far as I have understood, each session factory will update the > > > > "hibernate_unique_key" table and generate ids based on the "high" > > > > value returned. > > > > > Can the reading and updating of this "next high value" be considered > > > > an atomtic operation even though its done in separate processes? > > > > > Regards > > > > Thomas > > > > > -- > > > > You received this message because you are subscribed to the Google > > Groups > > > > "nhusers" group. > > > > To post to this group, send email to [email protected]. > > > > To unsubscribe from this group, send email to > > > > [email protected]<nhusers%[email protected]> > > <nhusers%[email protected]<nhusers%252bunsubscr...@googlegroups.com> > > > > > > > . > > > > For more options, visit this group at > > > >http://groups.google.com/group/nhusers?hl=en. > > > > -- > > > Fabio Maulo- Skjul tekst i anførselstegn - > > > > - Vis tekst i anførselstegn - > > > -- > > You received this message because you are subscribed to the Google Groups > > "nhusers" group. > > To post to this group, send email to [email protected]. > > To unsubscribe from this group, send email to > > [email protected]<nhusers%[email protected]> > > . > > For more options, visit this group at > >http://groups.google.com/group/nhusers?hl=en. > > -- > Fabio Maulo- Skjul tekst i anførselstegn - > > - Vis tekst i anførselstegn - -- You received this message because you are subscribed to the Google Groups "nhusers" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/nhusers?hl=en.
