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Most common Oracle
database failures are:
- backup files not recognizable by RDBMS
- database locked as 'suspect' preventing access
- deleted,dropped or
truncated tables
- accidentally deleted records
- corrupted database files and devices
- damaged individual data blocks
- accidentally overwritten database files and devices, etc.
Software failure includes problems
such as missing db-files, blocks, or rows in the database. Oracle Server has
the highest chance in this kind of failure.
At startup, if a database is found to have
corrupted blocks, an out-of-bounds row identifier (RID), or corrupt indexes,
it will be marked suspect and no other transactions will be allowed in the
database. If these types of errors occur during normal database operation,
they almost always indicate a serious problem, and the problem should be
corrected immediately.
and then
- after a security update of oracle server
the database did not start again
- getting several errors when starting the database like ORA-01251,
ORA-00600,
- there seems to be something wrong
with the header of your datafiles,
- you tried to recreate the control files, but oracle is not accepting the
datafiles
- there is no backup from the db
available,
- Oracle DBA Senior says : FORGET !!
- media recovery cannot recover the datafile,
- Oracle Data Unloader Utility DUL may be your only
solution but it is very
expensive !!!
- you have any datafile from your DB (*.ORA, *.DBF).
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NEW
RECOVERY TOOLS DBVIEW for ORACLE (like ORACLE DUL
for WINDOWS): 
