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Event-driven fine-grained auditing with Informix Dynamic Server
http://www-128.ibm.com/developerworks/db2/library/techarticle/dm-0410roy/

Part 1: Tuning Informix SQL
http://www-106.ibm.com/developerworks/db2/library/techarticle/dm-0409fan/index.html

Part 2: Tuning Informix SQL
http://ltsgnd001k.sby.ibm.com/developerworks/db2/library/techarticle/dm-0410fan/index.html

Basic IDS architecture and tuning
http://ltsgnd001k.sby.ibm.com/developerworks/db2/library/techarticle/dm-0406fan/index.html

Encryption over the wire with IDS 9.40
http://ltsgnd001k.sby.ibm.com/developerworks/db2/library/techarticle/dm-0401dandekar/index.html

Monitor and estimate logical log usage in Informix Dynamic Server
http://ltsgnd001k.sby.ibm.com/developerworks/db2/library/techarticle/dm-0311fan/index.html

SQL Statement Cache in Informix Dynamic Server
http://ltsgnd001k.sby.ibm.com/developerworks/db2/library/techarticle/0310iyer/0310iyer.html

An Overview of the IBM Informix Dynamic Server Optimizer
http://ltsgnd001k.sby.ibm.com/developerworks/db2/zones/informix/library/techarticle/0211desai/0211desai.html