How Drop Tablespace and Recover Oracle Database When Accidentally Delete Datafile
Accident may happens, even though it’s costly one. This is especially the case in Oracle database, which stores the database objects physically in data files on hard disk. Fast hand administrators may accidentally delete some of the datafiles, or the datafiles may get corrupted or unreadable on hard disk failure. You may get also some missing datafiles after database recovery process. In any case, missing a or a few datafiles will cause Oracle database to fail to startup, rendering the whole DB inaccessible.
The solution to the missing datafiles is to drop the affected tablespace where has incomplete datafiles, and then recreate the tablespace and import the data into the tablespace from backup. However, the steps are not so straight forward.
- Run SQL*Plus.
- Connect to database as SYSDBA with this query:
CONNECT / AS SYSDBA
- Mount the database instead of starting it up:
STARTUP MOUNT;
- Issue the following command to bring the missing datafile offline so that Oracle won’t trying to connect and access the datafile anymore:
ALTER DATABASE DATAFILE ‘<datafile name with complete path>’ OFFLINE DROP;
Repeat the command for every datafiles that unaccounted for.
- Now start the database proper:
ALTER DATABASE OPEN;
- As the tablespace has damaged, drop it to recreate from fresh backup.
DROP TABLESPACE <tablespace name> INCLUDING CONTENTS;
- Ensure the other datafiles for the tablespace has been deleted, if not, remove them manually from the operating system.
- Continue with the recovery process.
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Entries (RSS)
August 4th, 2007 02:57
[...] If one or more datafiles is missing after a recovery process or accidental deletion, you can use ALTER DATABASE DATAFILE <datafile name> OFFLINE DROP command to make the datafile offline so that database can starts up after which the troubled tablespace can be dropped. (See instruction to recover from missing datafiles.) [...]
April 2nd, 2008 18:27
These are only to drop the TS
but not to recover…
hence the worst….
July 8th, 2008 19:31
This info helped us to a very great extent and hence we are able to proceed further smoothly.
September 2nd, 2008 00:31
Thank you very much, this was really helpful.
I had problems dropping the tablespace, i had to drop the user also.
October 9th, 2008 02:31
Thank you for taking the time to post this very valuable information.