The Pyro Group has selected the MySQL Cluster database to power their InRoam SDP (Service Delivery Platform). InRoam enables Cell C and their network partners to provide low cost, border-less mobile communications services to hundreds of thousands of football fans from around the world as they descend on South Africa for the 2010 FIFA World Cup tournament.

This new case study can be downloaded from http://www.mysql.com/why-mysql/case-studies/mysql_cs-pyro_telecoms.php

Solution Overview

• Pyro InRoam SDP is an intelligent application enabling subscribers to communicate with ease across borders
• Migrated from a Microsoft platform with SQL Server to offer greater choice and less restrictive licensing
…

MySQL Cluster 7.1 introduced the ndbinfo database which contains views giving real-time access to a whole host of information that helps you monitor and tune your MySQL Cluster deployment. Because this data can be accessed through regular SQL, various systems can be configured to monitor the Cluster. This post gives one example, extending MySQL Enterprise Monitor to keep an eye on the amount of free memory on the data nodes (through a graph) and then raise an alarm when it starts to run low – even generating SNMP traps if that’s what you need.

One of the features of MySQL Enterprise Monitor is that you can define custom data collectors and that those data collectors can run SQL queries to get the data. The information retrieved by those custom data collectors can then be used with rules that the user defines through the MySQL Enterprise …

MySQL Cluster 7.1 was declared GA earlier this month and today (29 April) you have the chance to learn all about it by registering for this free webinar.

In blazing speed we will cover the most important features of MySQL Cluster 7.1: NDB$INFO; MySQL Cluster Connector/Java and other features that push the limits of MySQL Cluster into new workloads and communities.

NDB$INFO presents real-time usage statistics from the MySQL Cluster data nodes as a series of SQL tables, enabling developers and administrators to monitor database performance and optimize their applications.

Designed for Java developers, the MySQL Cluster Connector for Java implements an easy-to-use and high performance native Java interface and OpenJPA plug-in that …

The new ndbinfo interface in 7.1 is really useful to assist in tuning MySQL Cluster. Here is an example (more will follow):

I started with one test where I inserted two blobs (1KB + 1KB) in one table.
From 16 threads (colocated with one mysqld, two data nodes, separate computers) and one application driving the load I reached about 6960TPS, and the utilization of the redo buffers (controlled by the parameter RedoBuffer in config.ini) looked like:

mysql< select * from ndbinfo.logbuffers;
+---------+----------+--------+----------+----------+--------+
| node_id | log_type | log_id | log_part | total    | used   |
+---------+----------+--------+----------+----------+--------+
|       3 | REDO     |      0 |        1 | 50331648 | 196608 |
|       3 | REDO     |      0 |        2 | 50331648 | 294912 |
|       3 | REDO     |      0 |        3 | 50331648 | 131072 |
| …

MySQL Cluster 7.1 has been declared GA – including MySQL Cluster Connector for Java and MySQL Cluster Manager – see http://www.mysql.com/products/database/cluster/ for details.

Fig. 1 Java access to MySQL Cluster

This is a follow up to the earlier post Using ClusterJ (part of MySQL Cluster Connector for Java) – a tutorial but covers the ClusterJPA interface rather than ClusterJ.

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).

Typically a JPA implementation would access the database (for example, MySQL Cluster) using JDBC. JDBC gives a great deal of flexibility to the …

Fig. 1 Java access to MySQL Cluster

ClusterJ is part of the MySQL Cluster Connector for Java which is currently in beta as part of MySQL Cluster 7.1. It is designed to provide a high performance method for Java applications to store and access data in a MySQL Cluster database. It is also designed to be easy for Java developers to use and is “in the style of” Hibernate/Java Data Objects (JDO) and JPA. It uses the Domain Object Model DataMapper pattern:

• Data is represented as domain objects
• Domain objects are separate from business logic
• Domain objects are mapped to database tables

The purpose of ClusterJ is to provide a mapping from the table-oriented view of the data stored in MySQL Cluster to the Java objects used by the application. This is achieved by annotating …

The binary version for MySQL Cluster 7.1.2a has now been made available at http://dev.mysql.com/downloads/cluster/ under the Development tab.

Note that this beta load contains the latest NDBINFO and MySQL Cluster Connector for Java (ClusterJ) enhancements – please try them out and provide feedback (any bugs should be reported through bugs.mysql.com.

A description of all of the changes (fixes) that have gone into MySQL Cluster 7.1.2a (compared to 7.1.1) can be found in the MySQL Cluster 7.1.2a Change Log.

If you want to try out the beta features in MySQL Cluster 7.1 then you can either use the appropriate binaries or you can build it for yourself from source. Here I explain how to do this on LINUX.

Note that if you want to make use of OpenJPA then you first need to install OpenJPA and Connector/J.

The example here was on Fedora12 with the MySQL Cluster 7.1.2 source:

CFLAGS=”-O3″ CXX=gcc CXXFLAGS=”-O3 -felide-constructors -fno-exceptions -fno-rtti” ./configure -prefix=/usr/local/mysql –enable-assembler –with-mysqld-ldflags=-all-static –with-plugins=max –with-openjpa …

The binary version for MySQL Cluster 7.1.2 has now been made available at http://dev.mysql.com/downloads/cluster/ under the Development tab.

Note that this beta load contains the latest NDBINFO and MySQL Cluster Connector for Java (ClusterJ) enhancements – please try them out and provide feedback (any bugs should be reported through bugs.mysql.com.

A description of all of the changes (fixes) that have gone into MySQL Cluster 7.1.2 (compared to 7.1.2) can be found in the MySQL Cluster 7.1.2 Change Log.