(There is an "Enterprise Manager Console" in the Windows Oracle Start Menu, which allows you to directly edit tablespaces and files)
Alter Database
Open an existing database, and/or modify associated files.
Syntax:
ALTER DATABASE database_name options
Options:
open/mount options: MOUNT MOUNT STANDBY DATABASE MOUNT CLONE DATABASE MOUNT PARALLEL MOUNT STANDBY DATABASE CONVERT OPEN [READ ONLY] OPEN [READ WRITE] RESETLOGS|NORESETLOGS [MIGRATE] ACTIVATE STANDBY DATABASE [NATIONAL] CHARACTER SET char_setarchivelog options: ARCHIVELOG NOARCHIVELOGbackup and recovery options: BACKUP CONTROLFILE TO 'filename' [REUSE] BACKUP CONTROLFILE TO TRACE [RESETLOGS] [AS 'filename' [REUSE]] CREATE STANDBY CONTROLFILE AS 'filename' [REUSE] RECOVER recover_clause RECOVER MANAGED STANDBY standby_recover_clause END BACKUPDatafile options: CREATE DATAFILE 'filename' AS filespec DATAFILE 'filename' ONLINE DATAFILE 'filename' OFFLINE [DROP] DATAFILE 'filename' RESIZE int K | M DATAFILE 'filename' AUTOEXTEND OFF DATAFILE 'filename' AUTOEXTEND ON [NEXT int K | M] [MAXSIZE int K | M | UNLIMITED] DATAFILE 'filename' END BACKUP RENAME FILE 'data_file_name' TO 'data_file_name' TEMPFILE 'filename' ONLINE TEMPFILE 'filename' OFFLINE TEMPFILE 'filename' DROP [INCLUDING DATAFILES] TEMPFILE 'filename' RESIZE int K | M TEMPFILE 'filename' AUTOEXTEND OFF TEMPFILE 'filename' AUTOEXTEND ON [NEXT int K | M] [MAXSIZE int K | M | UNLIMITED]redo log options: ADD LOGFILE [THREAD int] [GROUP int] filespec ADD LOGFILE MEMBER 'filename' [REUSE] TO GROUP int ADD LOGFILE MEMBER 'filename' [REUSE] TO 'filename' DROP LOGFILE GROUP int DROP LOGFILE ('filename') DROP LOGFILE MEMBER 'filename' RENAME FILE 'redolog_file_name' TO 'redolog_file_name' CLEAR [UNARCHIVED] LOGFILE GROUP int [UNRECOVERABLE DATAFILE] CLEAR [UNARCHIVED] LOGFILE ('filename') [UNRECOVERABLE DATAFILE]Parallel server options: CREATE STANDBY CONTROLFILE AS 'filename' [REUSE] SET DBLOW = 'text' SET DBHIGH = 'text' SET DBMAC = ON | OFF ENABLE [PUBLIC] THREAD int DISABLE THREAD intBackwards compatibility options: RENAME GLOBAL_NAME TO database [domain] RESET COMPATIBILITY
Any option above that could des a 'filename' can be extended to cover multiple files using the Syntax:('Filename1','Filename2 ')
'Filename'[Offline] Drop will only work on a tablespace consisting of a single datafile, for a tablespace comprising multiple datafiles you can only drop a datafile by dropping the entiretablespace.
Some of the commands above can only be used when the database is in a particle state:
Mount, convert-require that the DB is not mounted.
Archivelog, noarchivlog, recover-require that the DB is mounted but not open (must be Mount exclusive-not mount parallel ).
Enable, disable, rename global_name, reset, set-require that the DB is open.
All other options will work with the DB mounted, open or closed as long as none of the files involved are 'in use'
database_name
Is defined when the database is created-it is normally set to the same as the database Sid.
Examples
Resize datafile:
SQL> ALTER DATABASE DATAFILE 'F:\oradata\live\Mydb02.ora' RESIZE 500m;
Take datafile offline:
SQL> ALTER DATABASE DATAFILE 'F:\oradata\live\Mydb02.ora' OFFLINE;
Database altered.
Take datafile online, when doing this, file recovery is needed to update the timestamp in the offline datafile header .:
SQL> ALTER DATABASE DATAFILE 'F:\oradata\live\Mydb02.ora' ONLINE; ALTER DATABASE DATAFILE 'F:\oradata\live\Mydb02.ora' ONLINE * ERROR at line 1: ORA-01113: file 16 needs media recovery ORA-01110: data file 16: 'F:\ORADATA\LIVE\Mydb02.ORA'
SQL> RECOVER DATAFILE 'F:\oradata\live\Mydb02.ora'; Media recovery complete.
SQL> ALTER DATABASE DATAFILE 'F:\oradata\live\Mydb02.ora' ONLINE;
Database altered
Change the database character set to utf8, this must be done with no users connected (restricted session)
SQL> SHUTDOWN IMMEDIATE; -- or NORMAL <do a full backup>SQL> STARTUP MOUNT;SQL> ALTER SYSTEM ENABLE RESTRICED SESSION;SQL> ALTER SYSTEM SET JOB_QUEUE_PROCESSES=0;SQL> ALTER DATABASE OPEN;SQL> ALTER DATABASE CHARACTER SET UTF8;SQL> SHUTDOWN IMMEDIATE; -- or NORMALSQL> STARTUP;
"You know, the very powerful and the very stupid have one thing in common, they don't alter their views to fit the facts, they alter the facts to fit the views, which can be uncomfortable, if you happen to be one of the facts that needs altering. "-doctor
Who
Related commands:
Database-Create Database
Recover
Shutdown
Startup
Alter tablespace
Alter System
Related views:
Global_name dba_data_files v $ controlfile v $ Database
V $ datafile v $ log V $ logfile