Basic alter database commands

alter database: Alter a Data File

ALTER DATABASE DATAFILE 4 OFFLINE;
ALTER DATABASE DATAFILE '/opt/oracle/datafile/users01.dbf' OFFLINE;
ALTER DATABASE DATAFILE '/opt/oracle/datafile/users01.dbf' RESIZE 100m;
ALTER DATABASE DATAFILE '/opt/oracle/datafile/users01.dbf'
AUTOEXTEND ON NEXT 100M MAXSIZE 1000M;
ALTER DATABASE DATAFILE 4 END BACKUP;

alter database: Alter a Tempfile

ALTER DATABASE TEMPFILE 4 RESIZE 100M;
ALTER DATABASE TEMPFILE 4 AUTOEXTEND ON NEXT 100M MAXSIZE 1000M;
ALTER DATABASE TEMPFILE 4 DROP INCLUDING DATAFILES;
ALTER DATABASE TEMPFILE 4 OFFLINE;

alter database: ARCHIVELOG Mode Commands

ALTER DATABASE ARCHIVELOG;
ALTER DATABASE NOARCHIVELOG;

ALTER DATABASE FORCE LOGGING;
ALTER DATABASE CLEAR LOGFILE '/opt/oracle/logfiles/redo01.rdo';
ALTER DATABASE CLEAR UNARCHIVED LOGFILE '/opt/oracle/logfiles/redo01.rdo';
ALTER DATABASE ADD SUPPLEMENTAL LOG DATA;
ALTER DATABASE ADD SUPPLEMENTAL LOG DATA (PRIMARY KEY, UNIQUE);
ALTER DATABASE DROP SUPPLEMENTAL LOG DATA;

alter database: Control File Operations

ALTER DATABASE BACKUP CONTROLFILE TO TRACE;
ALTER DATABASE BACKUP CONTROLFILE TO TRACE AS '/opt/oracle/logfile_backup/backup_logfile.trc' REUSE RESETLOGS;
ALTER DATABASE BACKUP CONTROLFILE TO '/opt/oracle/logfile_backup/backup_logfile.ctl';

alter database: Create a Data File

ALTER DATABASE CREATE DATAFILE '/opt/oracle/datafile/users01.dbf' AS '/opt/oracle/datafile/users01.dbf';
ALTER DATABASE CREATE DATAFILE 4 AS '/opt/oracle/datafile/users01.dbf';
ALTER DATABASE CREATE DATAFILE '/opt/oracle/datafile/users01.dbf' AS NEW;

alter database: Datafile Offline/Online

See alter database: Alter a Data File

alter database: Logfile Commands

ALTER DATABASE ADD LOGFILE GROUP 2
('/opt/oracle/logfiles/redo02a.rdo', '/opt/oracle/logfiles/redo02b.rdo') SIZE 300M REUSE;
ALTER DATABASE ADD LOGFILE MEMBER '/opt/oracle/logfiles/redo02c.rdo' to GROUP 2;
ALTER DATABASE ADD LOGFILE thread 3 GROUP 2
('/opt/oracle/logfiles/redo02a.rdo', '/opt/oracle/logfiles/redo02b.rdo') SIZE 300M REUSE;
ALTER DATABASE DROP LOGFILE GROUP 3;
ALTER DATABASE DROP LOGFILE MEMBER '/opt/oracle/logfiles/redo02b.rdo';

alter database: Mount and Open the Database

ALTER DATABASE MOUNT;
ALTER DATABASE OPEN;

alter database: Move or Rename a Database File or Online Redo Log

NOTE
The database must be mounted to rename or move online redo logs.
The database must be mounted or the data files taken offline to move database data files.

ALTER DATABASE RENAME FILE '/ora/datafile/oldfile.dbf' TO '/ora/datafile/newfile.dbf';
alter database: Open the Database Read-Only
ALTER DATABASE OPEN READ ONLY;
alter database: Open the Database with resetlogs
ALTER DATABASE OPEN RESETLOGS;