1. MySQL Cluster High-Availability Distributed Database

2. The Problem A single MySQL daemon can only handle approximately 6000 connections. The AvantGo sync process currently exceeds this limit during peak sync times.

3. Possible Solutions MySQL Cluster MySQL Replication MySQL Software Modifications OS Kernel Modifications

4. What is MySQL Cluster? MySQL Cluster is a distributed, replicated, in-memory storage engine for the MySQL database.

6. Pros High Availability Data Redundancy No Single Point of Failure High Performance Load Distribution No Disk Reads Real-Time Replication No Master/Slave Lag

7. Cons Large Memory Requirements All Records are Fixed Size Creates Hidden Indexes Slow Restarts Inefficient for Some Queries No Query Caching No FULLTEXT Index Support

8. Memory Requirements Table Number of Rows Avg (Total) Record Size MyISAM Data Size Cluster Data Size MCPINSTANCE55100 (572)5KB256MB MCPUSER14M10 (24)140MB363MB MCPUSEREMAIL14M26 (148)370MB2.4GB

9. Reality Check Difficult to Configure Difficult to Debug Limited Community Support Still Under Development

10. Cluster vs. Replication Cluster Application Transparent Excessive Hardware Requirements Limited Industry Test-Cases Replication Requires Application Changes Master/Slave Lag Issues Easy to Configure Industry-Tested

11. Conclusion MySQL Cluster is a promising solution, but it does not appear to be ready for production use at this time.