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Well, the best way to master any subject is by doing it. So, with that in mind, you should secure a position where you have access to DB2 and need to work with it to perform your job. But, I'm guessing that your objective is to get a job and that you are looking to get certified to obtain one.
If that is the case, then there are some steps you can take. First of all, consider obtaining the following books for study and reference:
DB2 Developer's Guide, 5th edition by Craig S. Mullins
Db2 For The Z/os Version 8 Certification by Susan Lawson
DB2 Universal Database for OS/390 v7.1 Application Certification Guide by Susan Lawson
You should also download, and review, all of the DB2 for z/OS manuals from the IBM Web site.
Additionally, regularly review the in-depth technical articles published by IBM at its developerWorks site.
Other good Web sites to bookmark and review include Search390.com, SearchDatabase.com, dbazine.com,
DB2 for OS390, and DB2 Times.
Regarding your final question, I would say that the best way to obtain my DBA book is via amazon.com.
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