Oracle oerr utility

It is nice to look up the ORA error on the server itself before surfing for clues on the web:

Setup the ENV:

[oracle@collabn1 ~]$ env | grep ORA
ORACLE_SID=SHAIKDB
ORACLE_BASE=/u01/app/oracle
ORAENV_ASK=NO
ORACLE_HOME=/u01/app/oracle/product/11.2.0.2/SHAIKPROD

EX:

oerr code error_number

[oracle@collabn1 trace]$ oerr ora 01555

01555, 00000, "snapshot too old: rollback segment number %s with name \"%s\" too small"
// *Cause: rollback records needed by a reader for consistent read are
//       overwritten by other writers
// *Action: If in Automatic Undo Management mode, increase undo_retention
//          setting. Otherwise, use larger rollback segments