Oracle® Database Backup and Recovery Reference 10g Release 2 (10.2) Part Number B14194-03 |
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Syntax
switch::=
switchFile::=
Purpose
To specify that a datafile copy is now the current datafile, that is, the datafile pointed to by the control file. A SWITCH
is equivalent to using the PL/SQL ALTER
DATABASE
RENAME
FILE
statement: the names of the files in the RMAN repository are updated, but the database does not actually rename the files at the operating system level. Note that this command deletes the RMAN repository records for the datafile copy from the recovery catalog and updates the control file records to status DELETED
.
Restrictions and Usage Notes
Execute the forms of SWITCH
in the switch
syntax diagram outside of a RUN block. Execute the forms of SWITCH
in the switchFile
syntax diagram within a RUN block.
If RMAN is connected to a recovery catalog, and the database is using a control file restored from backup, SWITCH
updates the control file with records of any datafiles known to the recovery catalog but missing from the control file.
Keywords and Parameters
switch
Syntax Element | Description |
---|---|
DATABASE TO COPY |
Renames the datafiles and control files to use the filenames of image copies of these files. RMAN switches to the latest image copy of each file.
After a database switch, RMAN considers the previous database files as datafile copies. |
DATAFILE datafileSpec TO COPY |
Specifies the datafile that you wish to rename. As with DATABASE TO COPY , specifies to switch this datafile to the latest image copy.
After the switch, the control file no longer considers the specified file as current. |
TABLESPACE ' tablespace_name ' TO COPY |
Switches all datafiles within the tablespace, as with SWITCH DATAFILE ... TO COPY . |
switchFile
Syntax Element | Description |
---|---|
DATAFILE ALL |
Specifies that all datafiles for which a SET NEWNAME FOR DATAFILE command has been issued in this job are switched to their new name. |
DATAFILE datafileSpec TO DATAFILECOPY {' filename ' | TAG = 'tag_name' } |
Specifies the datafile that you wish to rename. After the switch, the control file no longer considers the specified file as current. For example, this command points the control file from tbs_1.f to cp1.f :
SWITCH DATAFILE '?/dbs/tbs_1.f' TO DATAFILECOPY '?/dbs/copies/cp1.f'; If you do not specify a The filename or tag provided in the SWITCH DATAFILE 2 TO DATAFILECOPY '?/dbs/df2.copy'; Note that if you specify a tag and more than one copy uses this tag name, then RMAN uses the most current copy, that is, the one needing the least recovery. The following command switches datafile SWITCH DATAFILE 3 TO DATAFILECOPY TAG mondayPMcopy; |
TEMPFILE ALL |
Specifies that all tempfiles for which a SET NEWNAME FOR TEMPFILE command has been issued in this job are switched to their new name. |
TEMPFILE tempFileSpec TO { quoted_string | NEW |
With quoted_string, renames the specified tempfile to the name specified by quoted_string. With NEW, renames the specified tempfile to an OMF filename in DB_CREATE_FILE_DEST. The tempfile is created when the database is opened, if it does not exist. |
Examples
Switching Datafile Filenames After a Restore: Example This example allocates one disk device and one tape device to allow RMAN to restore from disk and tape.
RUN { ALLOCATE CHANNEL dev1 DEVICE TYPE DISK; ALLOCATE CHANNEL dev2 DEVICE TYPE sbt; SQL "ALTER TABLESPACE tbs_1 OFFLINE IMMEDIATE"; SET NEWNAME FOR DATAFILE '/disk7/oracle/tbs11.f' TO '/disk9/oracle/tbs11.f'; RESTORE TABLESPACE tbs_1; SWITCH DATAFILE ALL; RECOVER TABLESPACE tbs_1; SQL "ALTER TABLESPACE tbs_1 ONLINE"; }
Renaming a Tempfile Directly Using SWITCH TEMPFILE: Example This example renames a tempfile without using the SET NEWNAME
command to specify the new name for the file. Note that the database must not be open for this operation.
RUN { SWITCH TEMPFILE 1 TO '/newdisk/dbs/temp1.f'; }
Renaming a Tempfile Using SET NEWNAME and SWITCH TEMPFILE: Example This example demonstrates using SET
NEWNAME
to specify a new name for a tempfile, and SWITCH
to actually rename the tempfile to the specified name. Note that the database is not open at the start of this procedure. The tempfile is re-created when the database is opened.
RUN { SET NEWNAME FOR TEMPFILE 1 TO '/newdisk/dbs/temp1.f'; SWITCH TEMPFILE 1; RESTORE DATABASE; RECOVER DATABASE; ALTER DATABASE OPEN; }
Renaming Tempfiles Using SET NEWNAME and SWITCH TEMPFILE ALL: Example This example demonstrates using SET NEWNAME
to specify new names for several tempfiles, and SWITCH TEMPFILE ALL
to actually rename the tempfiles to the specified names. The database must be offline at the beginning of this procedure. The tempfiles are re-created at the new locations when the database is opened.
RUN { SET NEWNAME FOR TEMPFILE 1 TO '/newdisk/dbs/temp1.f'; SET NEWNAME FOR TEMPFILE 2 TO '/newdisk/dbs/temp2.f'; SET NEWNAME FOR TEMPFILE 3 TO NEW; #use OMF for this one SWITCH TEMPFILE ALL; RESTORE DATABASE; RECOVER DATABASE; ALTER DATABASE OPEN; }
Renaming Tempfiles Using SET NEWNAME and SWITCH TEMPFILE ALL: Example This example illustrates specifying names for tempfiles when duplicating a database for standby.
RUN { SET NEWNAME FOR TEMPFILE 1 TO '/newdisk/dbs/temp1.f'; SET NEWNAME FOR TEMPFILE 2 TO '/newdisk/dbs/temp2.f'; SET NEWNAME FOR TEMPFILE 3 TO '/newdisk/dbs/temp3.f'; DUPLICATE DATABASE FOR STANDBY; }