[link|http://publib-b.boulder.ibm.com/cgi-bin/searchsite.cgi?query=DB2|IBM Redbooks on DB2].
Their OS/2 Redbooks were pretty good. I've got no experience with DB2, but figured this might be a good place to start. Many/most of them can be read online or downloaded as .PDFs.
HTH.
Cheers,
Scott.