• OracleBasics
• OracleOnDebian
• PostgresOracleInteroperability
• MySqlNotes

Here's a shallow but interesting article on Oracle performance tuning on GNU/Linux systems: http://www.linuxjournal.com//article.php?sid=5840

postgres' nightly maintenance was emitting:

NOTICE:  RegisterSharedInvalid: SI buffer overflow
NOTICE:  InvalidateSharedInvalid: cache state reset
NOTICE:  RegisterSharedInvalid: SI buffer overflow
NOTICE:  InvalidateSharedInvalid: cache state reset
NOTICE:  RegisterSharedInvalid: SI buffer overflow
NOTICE:  InvalidateSharedInvalid: cache state reset

A note on one of the mailing lists indicates that this can happen if someone has an open transaction. In my case bouncing tomcat did the trick.

-- TobyCabot - 21 Sep 2001 - 25 Feb 2002