This is all just conjecture. Run a profiler on the section that is taking sooo long and find out for sure what it going on. We can waste weeks discussing what might be the problem.
-dain > -----Original Message----- > From: Peter Levart [mailto:[EMAIL PROTECTED]] > Sent: Tuesday, November 27, 2001 6:45 AM > To: danch; Peter Levart > Cc: Dain Sundstrom; [EMAIL PROTECTED] > Subject: Re: [JBoss-dev] EJB QL > > > On Monday 26 November 2001 19:08, danch wrote: > > Peter Levart wrote: > > > What about using finder methods like in BMP EBs? The > responsibility of a > > > BMP finder method is to return a Collection of primary > keys. That's easy > > > to do with JDBC/SQL. There would only have to be a way to > apply BMP > > > finders to CMP beans and we'll have dynamic SQL already. > > > > > > Currently I'm using JDBC/SQL to retrieve primary keys and > then a loop of > > > findByPrimaryKey() for each key to obtain Local > interfaces and it takes > > > about 1-2 seconds per 30 objects. The abovementioned BMP > finders would > > > speed things up considerably since it would only take one > invocation... > > > > That may still takes n+1 DB hits - remember that the BMP > finder returns > > a set of keys - beyond that you're OK if the bean is > already in cache > > (commit option A). If you're doing all this from a session bean (in > > transaction) it shouldn't be any faster with a BMP finder than what > > you're doing. Unless I'm missing something big. > > > > DB hits are one thing. I don't know if read-ahead option in > JBossCMP is used > for anything else than relations, but it would be a great > idea to apply this > to finders also. > > The other thing are invocations. Even if I use Local > interfaces to call a > bean from an already established transaction context, the > invocations have to > pass all the interceptors, etc. I was hoping that building the Local > interface from the primary key does not have to hit the DB until some > accessors in the Local interface are called, so building a > lot of local > interfaces should be cheap if it is done during one > invocation (a call to > finder method). > > Peter > > _______________________________________________ > Jboss-development mailing list > [EMAIL PROTECTED] > https://lists.sourceforge.net/lists/listinfo/jboss-development > _______________________________________________ Jboss-development mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-development
