Oracle Message ORA-01034 - ORACLE not available

ERRORORACLE not available
CAUSEOracle was not started up. Possible causes include the following: - The SGA requires more space than was allocated for it. - The operating-system variable pointing to the instance is improperly defined.
ACTIONRefer to accompanying messages for possible causes and correct the problem mentioned in the other messages. If Oracle has been initialized, then on some operating systems, verify that Oracle was linked correctly. See the platform specific Oracle documentation.

491174Composite SAP note for ORA-01034
601394Starting an Oracle 9i database with BRCONNECT fails
131561Work processes sometimes abend during database connect
583861UNIX: Errors due to Oracle executable