Hi, this question concerns the JBoss Cache and Hibernate.
Hibernate have a "limitation" that I would like to overcome. Hibernate cannot use the Same Schma for 2 different databases. Using C-JDBC is not the answer either. See: http://forum.hibernate.org/viewtopic.php?t=937847 http://forum.hibernate.org/viewtopic.php?t=938654&highlight=schema+multiple+database I read in the JBoss faq http://docs.jboss.org/jbcache/FAQ.html and in the documentation that the JBoss cache can use a Cache Loader (since 1.1) to persist its cache objects (FileCacheLoader, BdcjeCacheLoader and JDBCCacheLoader). anonymous wrote : | JBossCache 1.2 released: | - JDBC CacheLoader: allows to load/store data from DB | - Common dta transfer format: this allows for replication between different | CacheLoaders, e.g. FileCacheLoader and JDBCCacheLoader. Also | enables replication e.g. between MySQL and Oracle | (still needs more testing though) Would it be possible that 2 SessionFactory (each connect to a different physical DB, with a different schma: Schema 1 on DB1:Oracle, Schema 2 on DB2:Sybase) use the SAME cache loader? I means that if a Parent table is on Sybase, the Children data (on Oracle) could be retreived in memory because it could have been load in the same cache before? But from this mail: http://forum.hibernate.org/viewtopic.php?t=938654&highlight=schema+multiple+database it seems that it isn't the case. anonymous wrote : First, no, Hibernate will not be implementing in-memory joins But if the CacheLoader do the job, could it be possible? I think about 2 BdcjeCacheLoader for each SessionFactory loading in the same SleepyCat BD? anonymous wrote : BdbjeCacheLoader: this implementation is based on the Sleepycat Java Edition database, a fast and efficient transactional database. It uses a single file for the entire store. http://www.sleepycat.com/jeforjbosscache for details. Another options could be, using the JDBCCacheLoader, and cache the DB1:Oracle data inside the DB2:Sybase in a extended schema? So, the connection factory on DB2:Sybase might have all the data? I know this sound tricky to say the less, but could it be feasible by writing a CustomClassLoader? The goal of all this is to simulate a transparent SQL INNER JOIN between two physical databases and avoid tousand of "SQL SELECT" on a real DB. Note that the DB1:Oracle maintain only read-only data (easily cachable) and only updated by a batch process each day at 12AM. The DB2:Sybase would be the transactinoal (r/w) database. Thanks for replying Etienne. Montreal View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3869944#3869944 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=3869944 ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ JBoss-Development mailing list JBoss-Development@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jboss-development
