Re: [Zope] Re: Fwd: [Zope] postgres DA
Someone please correct me if I have gotten the stuff below wrong. --- If I read the stuff on the PoPy web site correctly, it is a Level 2 Database Adapter that is level 1 thread safe. The level 1 refers to level of thread safety not database adapter level. Level 1 thread safety means that multiple threads can share the module but each thread must have its own database connection. Level 2 thread safety means that multiple threads can share the module and connections. Level 3 thread safety means that multiple threads can share the module and connections and cursors. - Original Message - From: "Bak @ kedai" <[EMAIL PROTECTED]> To: "Federico Di Gregorio" <[EMAIL PROTECTED]> Cc: <[EMAIL PROTECTED]> Sent: Friday, June 02, 2000 4:10 AM Subject: [Zope] Re: Fwd: [Zope] postgres DA > I can only say that we started writing PoPy and ZPoPyDA because pygresql > (and the adapter based on it) are *not* thread safe. we were experimenting > deadlocks in zope when you mix db access from sql methods and external > methods in the same page. quoting DAroadmap at http://www.zope.org/Members/petrilli/DARoadmap """ Level 2 Level 2 database adapters must be safe to use in a multi-threaded Zope instance. This can take multiple behaviour paterns: Internal locking/mutexes for single DA access Global locking through the transaction manager if appropriate While a sub-optimal solution, it should be usable on any application that has minimal, or infrequent, database access. This means that all access paterns will be serialized. In addition, all DAs at this level must release the Python global interpreter lock. """ i assume ZPoPyDA conform to the above statement. will you make ZPoPyDa into level 3 anytime soon? > > on the other hand PoPy is pretty new and, before using it in production, > needs more testing. i think it will stabilize pretty soon, because we will > use it to build the web sites for our customers really soon now and that > will apport a lot of testing/debugging. > i will try ZPoPyDA on my personal site, and will inform you of any misbehaviour. BTW, what symptoms should i look out for if ZPoPyDa misbehave? Zope locking/not responding? >make your choice and be happy, made mine already, thanks, and """ I'll be back! """ > federico > > -- > Federico Di Gregorio > MIXAD LIVE System Programmer [EMAIL PROTECTED] > Debian GNU/Linux Developer & Italian Press Contact[EMAIL PROTECTED] > The reverse side also has a reverse side. -- Japanese proverb -- -- http://www.kedai.com.my/kk Am I Evil? ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev ) ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
[Zope] Re: Fwd: [Zope] postgres DA
> I can only say that we started writing PoPy and ZPoPyDA because pygresql > (and the adapter based on it) are *not* thread safe. we were experimenting > deadlocks in zope when you mix db access from sql methods and external > methods in the same page. quoting DAroadmap at http://www.zope.org/Members/petrilli/DARoadmap """ Level 2 Level 2 database adapters must be safe to use in a multi-threaded Zope instance. This can take multiple behaviour paterns: Internal locking/mutexes for single DA access Global locking through the transaction manager if appropriate While a sub-optimal solution, it should be usable on any application that has minimal, or infrequent, database access. This means that all access paterns will be serialized. In addition, all DAs at this level must release the Python global interpreter lock. """ i assume ZPoPyDA conform to the above statement. will you make ZPoPyDa into level 3 anytime soon? > > on the other hand PoPy is pretty new and, before using it in production, > needs more testing. i think it will stabilize pretty soon, because we will > use it to build the web sites for our customers really soon now and that > will apport a lot of testing/debugging. > i will try ZPoPyDA on my personal site, and will inform you of any misbehaviour. BTW, what symptoms should i look out for if ZPoPyDa misbehave? Zope locking/not responding? >make your choice and be happy, made mine already, thanks, and """ I'll be back! """ > federico > > -- > Federico Di Gregorio > MIXAD LIVE System Programmer [EMAIL PROTECTED] > Debian GNU/Linux Developer & Italian Press Contact[EMAIL PROTECTED] > The reverse side also has a reverse side. -- Japanese proverb -- -- http://www.kedai.com.my/kk Am I Evil? ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
Re: [Zope] postgres DA
On Fri, 02 Jun 2000, Stephan Richter wrote: hi stephan! > > I was just playing around with ZPoPyDA and PoPy (the Python module). It was > a little tricky to install, since the setup scripts are not fully automatic > yet, and the library header files did not point to my PostGres header files > directory. After the installation is done, everything worked like butter. > Be sure to compile PostGres with multibyte support, since you may run in > troubles otherwise. The RPMs are compiled using that option. i installed postgresql from RPM, so i guess that's ok. i managed to install ZPoPyDA, create a database connection, and do SQL stuff with no problems. sorry for my ignorance, but what is multibyte support, and what kind of problem one might run into if postgres was not compiled with multibyte support? > I am not able to evaluate ZPoPyDA at this point until I haven't done some > type testing and had the thread safety proof itself. how do one test for thread safety level? again, sorry for such obvious question. > > Regards, > Stephan > -- > Stephan Richter > CBU - Physics and Chemistry > Web2k - Web Design/Development & Technical Project Management -- -- http://www.kedai.com.my/kk Am I Evil? ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
[Zope] Re: Fwd: [Zope] postgres DA
Scavenging the mail folder uncovered Paolo Comitini's letter: > what's the current status of ZPygreSQLDA and ZPoPyDA? if i were to choose, > which should i use? and the reasons for using it? > > i understand that ZPoPyDA is level 2 thread safety, and not quite sure what > ZPygreSQLDA thread safety is. I can only say that we started writing PoPy and ZPoPyDA because pygresql (and the adapter based on it) are *not* thread safe. we were experimenting deadlocks in zope when you mix db access from sql methods and external methods in the same page. on the other hand PoPy is pretty new and, before using it in production, needs more testing. i think it will stabilize pretty soon, because we will use it to build the web sites for our customers really soon now and that will apport a lot of testing/debugging. make your choice and be happy, federico -- Federico Di Gregorio MIXAD LIVE System Programmer [EMAIL PROTECTED] Debian GNU/Linux Developer & Italian Press Contact[EMAIL PROTECTED] The reverse side also has a reverse side. -- Japanese proverb ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
[Zope] postgres DA
hi all, what's the current status of ZPygreSQLDA and ZPoPyDA? if i were to choose, which should i use? and the reasons for using it? i understand that ZPoPyDA is level 2 thread safety, and not quite sure what ZPygreSQLDA thread safety is. docs, pointers, explanation sought! thanks -- -- http://www.kedai.com.my/kk Am I Evil? ___ Zope maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )
