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while (psop->nextResult(true) == 0) { printf(" %8d %8d Range no : %2d\n", recAttrAttr1->u_32_value(), recAttrAttr2->u_32_value(), psop->get_range_no()); } psop->close(); } myNdb.closeTransaction(myTransaction); Copyright © 2010, Oracle and/or its affiliates. All rights reserved. 48/81
MySQL Cluster Connector for Java Technical Overview Prior to MySQL Cluster 7.1, the choices for Java developers were somewhat limited. The only supported method was JDBC – either directly or through a 3rd party layer such as Java Persistence API (JPA) compliant middleware. If Java users wanted greater performance then they were responsible for writing their own Java Native Interface (JNI) layer sitting between their (Java) application and the (C++) NDB API. With the introduction of MySQL Cluster 7.1, the options are much wider as shown in Figure 1. Working from left to right the options are: Figure 1: Options for Java Applications • Java application makes JDBC calls through “JDBC Driver for MySQL (Connector/J)”. This is a technology that many Java developers are comfortable and it is very flexible. However it requires that the application developer maps from their Java objects to relational, SQL statements. In addition, performance can be compromised as Connector/ J accesses the data through a MySQL Server rather than directly accessing the data nodes through the NDB API. • Applications can shift responsibility for the Object-Relational-Mapping (ORM) to a 3 rd party JPA solution (for example, Hibernate, Toplink or OpenJPA). While this frees the Java developer from having to work with a relational data model, performance can still be limited if the JPA layer is having to access the data via JDBC. • MySQL Cluster 7.1 introduces a plug-in for OpenJPA (ClusterJPA_ which allows most JPA operations to be performed through the NDB API (via a new “ClusterJ” layer) with the remainder using JDBC. This gives the Java developer the luxury of working purely with objects while still getting much of the performance benefits of using the NDB API. Copyright © 2010, Oracle and/or its affiliates. All rights reserved. 49/81
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: const NdbDictionary::Index *myPInde
Page 51 and 52: • SessionFactory: There is one in
Page 53 and 54: Figure 4: Performance of OpenJPA Ad
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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