ORACLE 11g case insensitive by default

Question

I found in this article, that since ORACLE 10g, there is a way to make a particular connection-session compare strings case-insensitive, without needing any crazy SQL functi

Answer 1

I tried using a logon trigger to issue these commands to get case-insensitive queries:

execute immediate 'alter session set NLS_SORT=BINARY_CI';
execute immediate 'alter session set NLS_COMP=LINGUISTIC';

And while that did give me CI, it also gave me unbelievably bad performance issues. We have one table in particular that, without those settings, inserts take 2 milliseconds. With those settings in place, inserts took 3 seconds. I have confirmed this by creating and dropping the trigger multiple times.

I don't know if doing it at the system level, as opposed to the session level with a trigger, makes a difference or not.