Maybe this will give you a hint: http://www.mail-archive.com/[EMAIL PROTECTED]/msg34183.html
<read-only> means doesn't synchronize with the transaction option C says don't cache between transactions This means the bean is removed from cache after each <read-only> invocation unless the lock has been promoted a transactional lock by a non <read-only> invocation. In other words, the data is reloaded on each invocation. Regards, Adrian On Sat, 2004-01-17 at 00:37, Boulatian, Misak wrote: > There are some bugs in JBoss 3.2.1 that forced us move to 3.2.3. For > example, in commit option C we would get warning 'unable to return to > the pool due to ctx lock' every time that type of bean was being used. > There was also another bug using version control attribute: cmp field > could not be specified as a version control attribute that did not > work with us. It seems like we > cannot use JBoss 3.2.1 anymore because of these bugs so I cannot > really prove if CMP 1.1 is faster than CMP 2.0 but I know that > 'modified' flag helped us minimize database synchs. How is it done in > CMP 2.0? From the traces I can tell that JBoss does not check any > dirty flag. > It seems like we are kind of stuck, don't know how to configure JBoss > running with cluster. None of the options like cache invalidation with > commit option A, regular cluster configuration, or even using commit > option C without cluster with row level locking in DB, give us normal > speed to go to production. > -----Original Message----- > From: Alexey Loubyansky [mailto:[EMAIL PROTECTED] > Sent: Friday, January 16, 2004 3:07 PM > To: [EMAIL PROTECTED] > Subject: RE: [JBoss-user] JBoss 3.2.3 commit option B or C a > lot slower than JBoss 3.2.1 > > > Why don't you try to run CMP2.0 version of your app on 3.2.1 > and see whether it's true. > What your experience shows is that CMP1.1 app is faster than > CMP2.0. > > ______________________________________________________ > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On > Behalf Of Boulatian, Misak > Sent: Friday, January 16, 2004 10:22 PM > To: [EMAIL PROTECTED] > Subject: [JBoss-user] JBoss 3.2.3 commit option B or C > a lot slower than JBoss 3.2.1 > > > Hi, > > It seems like JBoss 3.2.3 commit option B or C a lot > slower than JBoss 3.2.1 with same commit options. The > only difference is that with JBoss 3.2.1 we were > running CMP 1.1 with 'modified' flag optimization to > minimize the number of synchronizations with Database > (it served as some kind of dirty bit for an instance > of entity bean). With JBoss 3.2.3 we moved to CMP 2.0 > and lost the option to use 'modified' optimization. > Can this be the source of slowdown? By the way, all my > get methods are declared to be read only in the > jboss.xml. Here is a piece of log that I got: > > - JBOSS 3.2.3 with Commit-Option B (Sybase row-level > locking) > > I am doing a findBy***() to retrieve a Collection of > references to an Entity Bean. While iterating through > the collection, it appears that a SELECT statement is > executed for every get() method that is called.In > addition, the response time of each SELECT statement > is ~300ms. How can I improve this performance? The > Entity Bean is configured for transaction "Required". > > See logs below: > > > 2004-01-16 08:45:22,706 136813 DEBUG > > [org.jboss.ejb.plugins.cmp.jdbc.JDBCEJBQLQuery.PositionDetail#findByAccountId] > (TP-Processor4:) Executing SQL: SELECT t0_o.accountId, t0_o.accountType, > t0_o.countryCode, t0_o.currency, t0_o.symbol, t0_o.symbolType FROM PositionDetail > t0_o WHERE (t0_o.accountId = ?) > 2004-01-16 08:45:22,706 136813 TRACE > [org.jboss.resource.connectionmanager.JBossManagedConnectionPool] > (TP-Processor4:) supplying ManagedConnection from pool: [EMAIL PROTECTED] > 2004-01-16 08:45:22,706 136813 TRACE > [org.jboss.resource.connectionmanager.JBossManagedConnectionPool] > (TP-Processor4:) Getting connection from pool [InUse/Available/Max]: [1/10/20] > 2004-01-16 08:45:23,096 137203 TRACE > [org.jboss.resource.connectionmanager.JBossManagedConnectionPool] > (TP-Processor4:) putting ManagedConnection back into pool > 2004-01-16 08:45:23,096 137203 TRACE > [org.jboss.resource.connectionmanager.JBossManagedConnectionPool] > (TP-Processor4:) Returning connection to pool [InUse/Available/Max]: [0/10/20] > 2004-01-16 08:45:23,096 137203 DEBUG > > [org.jboss.ejb.plugins.cmp.jdbc.JDBCLoadEntityCommand.PositionDetail] > (TP-Processor4:) Executing SQL: SELECT dayTradingAmount, dayTradingQuantity, > marketValue, nonNegPosition, oca, requiredBoxQuantity, safekeepingQuantity, > settlementDatePosition, tradeDatePosition, transferQuantity FROM PositionDetail > WHERE (accountId=? AND accountType=? AND countryCode=? AND currency=? AND symbol=? > AND symbolType=?) > 2004-01-16 08:45:23,096 137203 TRACE > [org.jboss.resource.connectionmanager.JBossManagedConnectionPool] > (TP-Processor4:) supplying ManagedConnection from pool: [EMAIL PROTECTED] > 2004-01-16 08:45:23,096 137203 TRACE > [org.jboss.resource.connectionmanager.JBossManagedConnectionPool] > (TP-Processor4:) Getting connection from pool [InUse/Available/Max]: [1/10/20] > 2004-01-16 08:45:23,300 137407 TRACE > [org.jboss.resource.connectionmanager.JBossManagedConnectionPool] > (TP-Processor4:) putting ManagedConnection back into pool > 2004-01-16 08:45:23,300 137407 TRACE > [org.jboss.resource.connectionmanager.JBossManagedConnectionPool] > (TP-Processor4:) Returning connection to pool [InUse/Available/Max]: [0/10/20] > 2004-01-16 08:45:23,300 137407 DEBUG > > [org.jboss.ejb.plugins.cmp.jdbc.JDBCLoadEntityCommand.PositionDetail] > (TP-Processor4:) Executing SQL: SELECT dayTradingAmount, dayTradingQuantity, > marketValue, nonNegPosition, oca, requiredBoxQuantity, safekeepingQuantity, > settlementDatePosition, tradeDatePosition, transferQuantity FROM PositionDetail > WHERE (accountId=? AND accountType=? AND countryCode=? AND currency=? AND symbol=? > AND symbolType=?) > 2004-01-16 08:45:23,300 137407 TRACE > [org.jboss.resource.connectionmanager.JBossManagedConnectionPool] > (TP-Processor4:) supplying ManagedConnection from pool: [EMAIL PROTECTED] > 2004-01-16 08:45:23,300 137407 TRACE > [org.jboss.resource.connectionmanager.JBossManagedConnectionPool] > (TP-Processor4:) Getting connection from pool [InUse/Available/Max]: [1/10/20] > 2004-01-16 08:45:23,628 137735 TRACE > [org.jboss.resource.connectionmanager.JBossManagedConnectionPool] > (TP-Processor4:) putting ManagedConnection back into pool > 2004-01-16 08:45:23,628 137735 TRACE > [org.jboss.resource.connectionmanager.JBossManagedConnectionPool] > (TP-Processor4:) Returning connection to pool [InUse/Available/Max]: [0/10/20] > 2004-01-16 08:45:23,628 137735 DEBUG > > [org.jboss.ejb.plugins.cmp.jdbc.JDBCLoadEntityCommand.PositionDetail] > (TP-Processor4:) Executing SQL: SELECT dayTradingAmount, dayTradingQuantity, > marketValue, nonNegPosition, oca, requiredBoxQuantity, safekeepingQuantity, > settlementDatePosition, tradeDatePosition, transferQuantity FROM PositionDetail > WHERE (accountId=? AND accountType=? AND countryCode=? AND currency=? AND symbol=? > AND symbolType=?) > 2004-01-16 08:45:23,628 137735 TRACE > [org.jboss.resource.connectionmanager.JBossManagedConnectionPool] > (TP-Processor4:) supplying ManagedConnection from pool: [EMAIL PROTECTED] > 2004-01-16 08:45:23,628 137735 TRACE > [org.jboss.resource.connectionmanager.JBossManagedConnectionPool] > (TP-Processor4:) Getting connection from pool [InUse/Available/Max]: [1/10/20] > 2004-01-16 08:45:23,956 138063 TRACE > [org.jboss.resource.connectionmanager.JBossManagedConnectionPool] > (TP-Processor4:) putting ManagedConnection back into pool > 2004-01-16 08:45:23,956 138063 TRACE > [org.jboss.resource.connectionmanager.JBossManagedConnectionPool] > (TP-Processor4:) Returning connection to pool [InUse/Available/Max]: [0/10/20] > 2004-01-16 08:45:23,956 138063 DEBUG > > [org.jboss.ejb.plugins.cmp.jdbc.JDBCLoadEntityCommand.PositionDetail] > (TP-Processor4:) Executing SQL: SELECT dayTradingAmount, dayTradingQuantity, > marketValue, nonNegPosition, oca, requiredBoxQuantity, safekeepingQuantity, > settlementDatePosition, tradeDatePosition, transferQuantity FROM PositionDetail > WHERE (accountId=? AND accountType=? AND countryCode=? AND currency=? AND symbol=? > AND symbolType=?) > 2004-01-16 08:45:23,956 138063 TRACE > [org.jboss.resource.connectionmanager.JBossManagedConnectionPool] > (TP-Processor4:) supplying ManagedConnection from pool: [EMAIL PROTECTED] > 2004-01-16 08:45:23,956 138063 TRACE > [org.jboss.resource.connectionmanager.JBossManagedConnectionPool] > (TP-Processor4:) Getting connection from pool [InUse/Available/Max]: [1/10/20] > 2004-01-16 08:45:24,300 138407 TRACE > [org.jboss.resource.connectionmanager.JBossManagedConnectionPool] > (TP-Processor4:) putting ManagedConnection back into pool > 2004-01-16 08:45:24,300 138407 TRACE > [org.jboss.resource.connectionmanager.JBossManagedConnectionPool] > (TP-Processor4:) Returning connection to pool [InUse/Available/Max]: [0/10/20] > 2004-01-16 08:45:24,300 138407 DEBUG > > [org.jboss.ejb.plugins.cmp.jdbc.JDBCLoadEntityCommand.PositionDetail] > (TP-Processor4:) Executing SQL: SELECT dayTradingAmount, dayTradingQuantity, > marketValue, nonNegPosition, oca, requiredBoxQuantity, safekeepingQuantity, > settlementDatePosition, tradeDatePosition, transferQuantity FROM PositionDetail > WHERE (accountId=? AND accountType=? AND countryCode=? AND currency=? AND symbol=? > AND symbolType=?) > 2004-01-16 08:45:24,300 138407 TRACE > [org.jboss.resource.connectionmanager.JBossManagedConnectionPool] > (TP-Processor4:) supplying ManagedConnection from pool: [EMAIL PROTECTED] > 2004-01-16 08:45:24,300 138407 TRACE > [org.jboss.resource.connectionmanager.JBossManagedConnectionPool] > (TP-Processor4:) Getting connection from pool [InUse/Available/Max]: [1/10/20] > 2004-01-16 08:45:24,628 138735 TRACE > [org.jboss.resource.connectionmanager.JBossManagedConnectionPool] > (TP-Processor4:) putting ManagedConnection back into pool > 2004-01-16 08:45:24,628 138735 TRACE > [org.jboss.resource.connectionmanager.JBossManagedConnectionPool] > (TP-Processor4:) Returning connection to pool [InUse/Available/Max]: [0/10/20] > 2004-01-16 08:45:24,628 138735 DEBUG > > [org.jboss.ejb.plugins.cmp.jdbc.JDBCLoadEntityCommand.PositionDetail] > (TP-Processor4:) Executing SQL: SELECT dayTradingAmount, dayTradingQuantity, > marketValue, nonNegPosition, oca, requiredBoxQuantity, safekeepingQuantity, > settlementDatePosition, tradeDatePosition, transferQuantity FROM PositionDetail > WHERE (accountId=? AND accountType=? AND countryCode=? AND currency=? AND symbol=? > AND symbolType=?) > > Thanks, > Misak > > > > > > > > > > This message and any attachments are intended only for > the use of the addressee and may contain information > that is privileged and confidential. If the reader of > the message is not the intended recipient or an > authorized representative of the intended recipient, > you are hereby notified that any dissemination of this > communication is strictly prohibited. If you have > received this communication in error, please notify us > immediately by e-mail and delete the message and any > attachments from your system. -- xxxxxxxxxxxxxxxxxxxxxxxx Adrian Brock Director of Support Back Office JBoss Group, LLC xxxxxxxxxxxxxxxxxxxxxxxx ------------------------------------------------------- The SF.Net email is sponsored by EclipseCon 2004 Premiere Conference on Open Tools Development and Integration See the breadth of Eclipse activity. 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