As usual, the IBM Redbooks are free to download and free to use, but highly valuable. Here are some IBM Redbooks on DB2 which are available in the EPUB format:
- Unleashing DB2 10 for Linux, UNIX, and Windows
- High Availability and Disaster Recovery Options for DB2 for Linux, UNIX, and Windows
- DB2 Virtualization
- DB2 Workload Manager for Linux, UNIX, and Windows
- Oracle to DB2 Conversion Guide: Compatibility Made Easy
- MySQL to DB2 Conversion Guide
- IBM Optim Performance Manager for DB2 for Linux, UNIX, and Windows
- DB2 for z/OS Performance Topics
- Security Functions of DB2 10 for z/OS
- and several more by searching on the Redbooks page