This section is from the "Practical mod_perl" book, by Stas Bekman and Eric Cholet. Also available from Amazon: Practical mod_perl
Chapters 2 and 3 of the book Programming the Perl DBI, by Alligator Descartes and Tim Bunce (O'Reilly), provide a good overview of relational and nonrelational databases
Chapter 10 of the book Advanced Perl Programming, by Sriram Srinivasan (O'Reilly), talks about persistence
 
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