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ClusterJPA JPA is the Java standard for persistence and different vendors can implement their own implementation of this API and they can (and do) add proprietary extensions. Three of the most common implementations are OpenJPA, Hibernate and Toplink. JPA can be used within server containers or outside of them (i.e. with either J2EE or J2SE). OpenJPA > ClusterJ > NDB API OpenJPA > Connector/J > MySQL > NDB API Insert Delete Find (Primary Key reads) Update Other queries Typically a JPA implementation would access the database (for example, MySQL Cluster) using JDBC. JDBC gives a great deal of flexibility to the JPA implementer but it cannot give the best performance when using MySQL Cluster as there is an internal conversion to SQL by Connector/J and a subsequent translation from SQL to the C++ NDB API by the MySQL Server. As of MySQL Cluster 7.1, OpenJPA can be configured to use the high performance NDB API (via ClusterJ) for most operations but fall back on JDBC for more complex queries. The first implementation of ClusterJPA is as an OpenJPA BrokerFactory but in the future, it may be extended to work with other JPA implementations. ClusterJPA overcomes ClusterJ limitations, notably: • Persistent classes • Relationships • Joins in queries • Lazy loading • Table and index creation from object model Typically users base their selection of a JPA solution on factors such as proprietary extensions, what existing applications already use and (increasingly with ClusterJPA) performance. The performance of ClusterJPA (OpenJPA using ClusterJ) has been compared with OpenJPA using JDBC in Figure 4. It should be noted that the performance is significantly better when using ClusterJPA (the yellow bar). It is hoped that in the future the performance can be improved even further for finds, updates and deletes. Copyright © 2010, Oracle and/or its affiliates. All rights reserved. 52/81
Figure 4: Performance of OpenJPA Adapting an OpenJPA based application to use ClusterJPA with MySQL Cluster should be fairly straight-forward with the main change being in the definition of the persistence unit in persistence.xml:
Page 1 and 2: MySQL Cluster Tutorial O’Reilly M
Page 3 and 4: ndbinfo Data Node Statistics! 39 nd
Page 5 and 6: Introduction MySQL Cluster is a too
Page 7 and 8: MySQL Cluster in short • MySQL Cl
Page 9 and 10: Installation and Configuration In t
Page 11 and 12: Configuration my_Slave.cnf Configur
Page 13 and 14: Starting & Using MySQL Cluster Star
Page 15 and 16: ndb_mgm> show Connected to Manageme
Page 17 and 18: Administer MySQL Cluster MySQL Clus
Page 19 and 20: ndb_mgm> 2 restart Node 2: Node shu
Page 21 and 22: to load problems such as timing iss
Page 23 and 24: MySQL Cluster Manager MySQL Cluster
Page 25 and 26: • The management node(s) can cont
Page 27 and 28: Example configuration Throughout th
Page 29 and 30: example, the MySQL Cluster installa
Page 31 and 32: 3. Fetch the port parameter to conn
Page 33 and 34: Introducing MySQL Cluster Manager t
Page 35 and 36: within 4 heartbeat intervals. This
Page 37 and 38: • Stored routines and other none
Page 39 and 40: NDB Info ndbinfo Data Node Statisti
Page 41 and 42: For the redo log space, there is 1
Page 43 and 44: NDB API NDB API Overview The NDB AP
Page 45 and 46: static void run_application(MYSQL &
Page 47 and 48: const NdbDictionary::Index *myPInde
Page 49 and 50: MySQL Cluster Connector for Java Te
Page 51: • SessionFactory: There is one in
Page 55 and 56: config.ini: [ndbd default]noofrepli
Page 57 and 58: The next step is to write the appli
Page 59 and 60: mysql> select * from clusterdb.empl
Page 61 and 62: Compiling and running the ClusterJ
Page 63 and 64: Employee.java: import javax.persist
Page 65 and 66: Main.java (part 2): userTransaction
Page 67 and 68: Main.java (part 4): em.close(); ent
Page 69 and 70: This fails with an error saying the
Page 71 and 72: Scaling and Performance MySQL Nodes
Page 73 and 74: Geographical Replication The MySQL
Page 75 and 76: You can, however, have a more reada
Page 77 and 78: shell> mysql mysql_A:(none)> SHOW M
Page 79 and 80: On the Slave we now issue the CHANG
Page 81: Security It should be noted right f

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