Info about JPA (unorganized as of now)
Blogs
Purging old trace files
http://www.pafumi.net/11g_Trace_Dump_Files_ADRCI.html
RAC voting disk
Starting and stopping RAC
Configuring client connections for RAC. Using client-side failover and TAF. Doc ID: ID 453293.1
Duplicating database with RMAN
Monitoring tablespaces usage
Contents of UNDO tablespace
Sqlplus formatting