but it is a winService a webService a winForm a webForm a ASP.MVC, is using
WCF, is based on messages....What you can do ("on-the-fly analysis") is open
one session per persistence iteration.
Mean:
- start iteration
- open session for db1 and db2
- read from db1
- write to db2
- commit db2 / rollback db1
- dispose session of db1 and db2
- end iteration2009/3/17 Utopico <[email protected]> > > Basically what I have is the following: > * One application that stores data to one database (raw binary data) > * One application that gets data from this database, decodes and > processes it before writing it back to another database. > * The reason for the two databases is that the first application is > made very simple so that it can become "bugfree" while the other is > more complex with possible user extensions with new decoders and > processing algorithms. > * Both these applications is 24/7 applications with data comming in > fairly frequently (every 10-30 seconds) > * So the application I refere to here is the second one > * They will mostly run without user interaction > > > On 17 Mar, 14:39, Fabio Maulo <[email protected]> wrote: > > Where is the description of the use case? > > > > 2009/3/17 Utopico <[email protected]> > > > > > > > > > > > > > How would you suggest to have the session management pattern? > > > > > On 17 Mar, 14:23, Fabio Maulo <[email protected]> wrote: > > > > 2009/3/17 Utopico <[email protected]> > > > > > > > Ok. Thank you very much. > > > > > > > I guess the second-level cache will not be cleared during this > > > > > process? > > > > > > No man.... not the cache but the session-cache. > > > > BTW change you session management pattern. > > > > > > > On 17 Mar, 14:00, Oskar Berggren <[email protected]> wrote: > > > > > > If you're interested you could have a look at the numbers in > > > > > > ISession.Statistics for an idea about how big your session has > > > become. > > > > > > > > /Oskar > > > > > > > > 2009/3/17 Fabio Maulo <[email protected]> > > > > > > > > > open and close the nh-session for each message/operation. > > > > > > > > > 2009/3/17 Utopico <[email protected]> > > > > > > > > >> In a real application there would be many datasources > reporting > > > data > > > > > > >> (at less frequent intervals). So how would you suggest to > handle > > > the > > > > > > >> session in this case? A realistic scenario would about 30 > > > datasources > > > > > > >> reporting data every 60 minutes. > > > > > > > > >> On 17 Mar, 12:16, Oskar Berggren <[email protected]> > > > wrote: > > > > > > >> > Session is not really meant to be long running. Try creating > a > > > new > > > > > > >> session > > > > > > >> > for each "run" or at least clear the sessions cache. > > > > > > > > >> > /Oskar > > > > > > > > >> > 2009/3/17 Utopico <[email protected]> > > > > > > > > >> > > Using same session (at least th. I have now done a bit > more > > > > > > >> > > monitoring. And it seems that the CPU and memory load is > > > > > increasing > > > > > > >> > > over time while the actual disc writes does not. Also the > > > > > performance > > > > > > >> > > of the database server does not seem to change when > monitoring > > > the > > > > > > >> > > database directly while the application is running. > > > > > > > > >> > > On 17 Mar, 11:07, Ayende Rahien <[email protected]> > wrote: > > > > > > >> > > > Are you using the same session? Or creating a session > every > > > > > time? > > > > > > > > >> > > > On Tue, Mar 17, 2009 at 11:31 AM, Utopico < > > > > > [email protected]> > > > > > > >> > > wrote: > > > > > > > > >> > > > > I have used hibernate for about half a year, but not > with > > > very > > > > > > >> high > > > > > > >> > > > > load. Yesterday I had an application running that > slowed > > > down > > > > > > >> > > > > significantly after running through the night (from > > > fraction > > > > > of a > > > > > > >> > > > > second to 10-15 seconds). I am pretty sure that there > is > > > > > somthing > > > > > > >> can > > > > > > >> > > > > be done to improve this, or a way to find out what is > the > > > > > cause. I > > > > > > >> > > > > need some help with this. > > > > > > > > >> > > > > So for my application > > > > > > >> > > > > * I use NHibernate 2.0.0.GA > > > > > > >> > > > > * Visual studio 2008 > > > > > > >> > > > > * FirebirdSQL 2.0 > > > > > > >> > > > > * received data every 15 seconds on a serial port > which is > > > > > then > > > > > > >> > > > > decoded. This results in: > > > > > > >> > > > > - check for datatype (cached query through SysCache > > > since > > > > > these > > > > > > >> > > > > values are updated seldom, but checked often) and > possible > > > > > > >> addition of > > > > > > >> > > > > new datatype entry (each datavalue has a datatype > > > associated > > > > > with > > > > > > >> it) > > > > > > >> > > > > - using sequence generator for ID on datavalue and > > > > > dataobject > > > > > > >> > > > > - insert of a dataobject which has about 120 values > > > > > associated > > > > > > >> as > > > > > > >> > > > > follows (results in one dataobject insert and 120 > inserts: > > > > > > >> > > > > [NHibernate.Mapping.Attributes.Bag(Table = > > > > > "DATA_VALUE", > > > > > > >> > > > > Inverse = true, Lazy = true, OrderBy = "TYPE_ID ASC, > IDX > > > ASC", > > > > > > >> Cascade > > > > > > >> > > > > = "all-delete-orphan")] > > > > > > >> > > > > [NHibernate.Mapping.Attributes.Key(1, Column = > > > > > "REC_ID")] > > > > > > >> > > > > [NHibernate.Mapping.Attributes.OneToMany(2, > > > ClassType = > > > > > > >> typeof > > > > > > >> > > > > (Nortek.SeaState.Domain.DataValue))] > > > > > > >> > > > > public virtual IList<DataValue> Values > > > > > > >> > > > > { > > > > > > >> > > > > get > > > > > > >> > > > > { > > > > > > >> > > > > return this._values; > > > > > > >> > > > > } > > > > > > >> > > > > set > > > > > > >> > > > > { > > > > > > >> > > > > this._values = value; > > > > > > >> > > > > } > > > > > > >> > > > > } > > > > > > >> > > > > * All the above is inclosed in a transaction with > > > ReadCommited > > > > > > > > >> > > > > Would I benefit from batch inserts or any other > > > performance > > > > > trick? > > > > > > >> Or > > > > > > >> > > > > is there some stupid flaw in my way of using > hibernate? > > > > > > > > > -- > > > > > > > Fabio Maulo > > > > > > -- > > > > Fabio Maulo > > > > -- > > Fabio Maulo > > > -- Fabio Maulo --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "nhusers" group. 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