Accelerate Your JBoss Enterprise Middleware - Red Hat Summit
Accelerate Your JBoss Enterprise Middleware - Red Hat Summit Accelerate Your JBoss Enterprise Middleware - Red Hat Summit
Accelerate Your JBoss Enterprise Middleware –Persistence JPA/HibernatePersistencePersistenceJPAJPAHibernateHibernate● Fetch sizes● In Hibernate you can specify how many rows to return from thedatabase at one time for queries that return more than one row.● If you return one row at a time, and there are tens, hundreds, oreven thousands, its going to increase response times, but alsoadd lots of latency for the rounds trips to and from the database.● You specify this through a Hibernate property:●●●Sizing of this parameter requires knowledge of the applicationqueries and the typical usage of the result set.● e.g., in the application that is represented by the graphs for thesecond-level cache results, the fetch size is set to 20, eventhough one of the main queries may return as many as 500rows.● The reason for 20, instead of 500, is that the result set is managedby a stateful session bean that paginates by 20 rows at a time.Understanding the frequency in which a user will even go past thefirst 20 rows is important!Like the batch size, this can be set in the persistence.xml.
Accelerate Your JBoss Enterprise Middleware –Persistence JPA/HibernatePersistencePersistenceJPAJPAHibernateHibernate● Batch Inserts● What do I mean by batch inserts?● This is when you can take multiple insert statements, that wouldnormally be sent to and executed by the database one at a time,and make it into a single insert statement.● e.g.●●●●●●Insert into Table (id, val1, val2, val3) values ('x', 'x', 'x', 'x);Insert into Table (id, val1, val2, val3) values ('y', 'y', 'y', 'y');Insert into Table (id, val1, val2, val3) values ('z', 'z', 'z', 'z');And turn it into:●Insert into Table (id, val1, val2, val3) values('x', 'x', 'x', 'x'),('y', 'y', 'y', 'y'), ('z', 'z', 'z', 'z');This feature is dependent on two things. This first being aHibernate property:●The second being the JDBC driver's capabilities to rewrite thestatement:● e.g., the MySQL JDBC driver has a connection property called:● rewriteBatchedStatements
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<strong>Accelerate</strong> <strong>Your</strong> <strong>JBoss</strong> <strong>Enterprise</strong> <strong>Middleware</strong> –Persistence JPA/HibernatePersistencePersistenceJPAJPAHibernateHibernate● Fetch sizes● In Hibernate you can specify how many rows to return from thedatabase at one time for queries that return more than one row.● If you return one row at a time, and there are tens, hundreds, oreven thousands, its going to increase response times, but alsoadd lots of latency for the rounds trips to and from the database.● You specify this through a Hibernate property:●●●Sizing of this parameter requires knowledge of the applicationqueries and the typical usage of the result set.● e.g., in the application that is represented by the graphs for thesecond-level cache results, the fetch size is set to 20, eventhough one of the main queries may return as many as 500rows.● The reason for 20, instead of 500, is that the result set is managedby a stateful session bean that paginates by 20 rows at a time.Understanding the frequency in which a user will even go past thefirst 20 rows is important!Like the batch size, this can be set in the persistence.xml.
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