Multi version concurrency control. For instance with H2 if you don't have MVCC you can only create a connection with a single thread.
On 10-07-07 10:31 AM, Jody Garnett wrote: > Can someone translate MVCC? > > I note that we faced the same issue with arcsde (not being threadsafe) and > made a queue of commands with a single worker thread allowed access to the > connection. > > Jody > > On 08/07/2010, at 1:59 AM, Justin Deoliveira wrote: > >> It really depends. I would say no there is no inherent assumption in >> geotools itself about how a backend will handle multiple concurrent >> connections. >> >> However practically anyone that intends to use GeoServer in a server app >> like GeoServer (or a multi threaded client app for that matter) is >> essentially making the assumption. And the geotools datastore api does >> imply that implementations support multi threading. >> >> I have this same issue for H2. I intend to enable the MVCC by default soon. >> >> -Justin >> >> On 10-07-07 8:53 AM, Alex Trofast wrote: >>> Greetings all, >>> >>> I had a quick question regarding GeoTools and multiple transactions. >>> When running some of the transactional concurrency tests I would get >>> failures and/or hangs with Ingres. However when I turned on MVCC >>> features these tests would pass/not hang. Does GeoTools ASSUME that the >>> DBMS is MVCC enabled? This is actually a very new feature in Ingres and >>> is still in beta so I'm just wondering if there is any control to what >>> the expected behaviour is. >>> >>> Thank you kindly, >>> >> >> >> -- >> Justin Deoliveira >> OpenGeo - http://opengeo.org >> Enterprise support for open source geospatial. >> >> ------------------------------------------------------------------------------ >> This SF.net email is sponsored by Sprint >> What will you do first with EVO, the first 4G phone? >> Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first >> _______________________________________________ >> Geotools-devel mailing list >> Geotools-devel@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/geotools-devel > -- Justin Deoliveira OpenGeo - http://opengeo.org Enterprise support for open source geospatial. ------------------------------------------------------------------------------ This SF.net email is sponsored by Sprint What will you do first with EVO, the first 4G phone? Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first _______________________________________________ Geotools-devel mailing list Geotools-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/geotools-devel
