Good ref site
http://www.psoug.org/reference

RAC is a the predecessor to Oracle Parallel Server, with integrated hardware
clustering.

Grid Computing is sharing of host resources like RAM across computers.


Document that Oracle's DATE format defaults are:

   1. OUTPUT:  YYYY-MM-DD HH24:MI:SS
   2. INPUT:  DD-MON-YY

INSTANCE STARTUP
    As member of sysdba or sysoper UNIX group:
        sqlplus /nolog
        connect / as sysoper|sysdba

LOGIN CONFIG
    export ORACLE_SID and ORACLE_HOME values
    set ORAENV_ASK to NO  (no need to export)
    . $ORACLE_HOME/bin/oraenv

CHANGING PASSWORDS
    Can change your own password with SqlPlus by just running "password".
    Generally, as a privileged user:  alter user x identified by y; commit;

Max table name length: 30
Max column name length: 30


Regexp support.  Most useful:
WHERE REGEXP_LIKE(first_name, '^Ste(v|ph)en$')
REGEXP_REPLACE(country_name, '(.)', '\1 ')
REGEXP_SUBSTR('oracle', 'o r a c l e', 1, 1, 'x')