Natural versus surrogate primary key discussion

Differences between NVL and COALESCE

Plan management

How to reorginize sys.aud$

Temporary tablespace may be used for sorting and for temporary lobs

http://allthingsoracle.com/multi-table-insert-statements-in-oracle/

Info about JPA (unorganized as of now)

Blogs

PL/SQL named exceptions

Purging old trace files

http://www.pafumi.net/11g_Trace_Dump_Files_ADRCI.html