Switch datafile datafilespec to copy ; what this does ?
1) SWITCH DATAFILE datafileSpec;
2) SWITCH DATAFILE datafileSpec TO COPY;
^^
I cant understand the difference in the above 2 commands teIs there a difference in the above 2 commands.
The description in DOC is :
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.
When would the 2nd option be preferred over the 1st ?
The basic difference is that switch datafile datafileSpec can not be run outsize a run block whereas "SWITCH DATAFILE datafileSpec TO COPY";
perfectly does. More over "SWITCH DATAFILE datafileSpec" can not be use barely.
consolidaterac1@oracle $ rman target /
Recovery Manager: Release 11.1.0.6.0 - Production on Mon May 18 09:03:27 2009
Copyright (c) 1982, 2007, Oracle. All rights reserved.
connected to target database: X4540 (DBID=1568043037)
RMAN> copy datafile 1 to '+DATA';
Starting backup at 18-MAY-09
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=292 device type=DISK
channel ORA_DISK_1: starting datafile copy
input datafile file number=00001 name=+DATA/x4540/datafile/system.256.685477569
output file name=+DATA/x4540/datafile/system.370.687171837 tag=TAG20090518T090350 RECID=392 STAMP=687171858
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:25
Finished backup at 18-MAY-09
RMAN> startup mount force;
Oracle instance started
database mounted
Total System Global Area 2058981376 bytes
Fixed Size 1300968 bytes
Variable Size 553649688 bytes
Database Buffers 1493172224 bytes
Redo Buffers 10858496 bytes
RMAN> switch datafile 1 to copy;
datafile 1 switched to datafile copy "+DATA/x4540/datafile/system.370.687171837"
RMAN> recover datafile 1 ;
Starting recover at 18-MAY-09
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=314 device type=DISK
starting media recovery
media recovery complete, elapsed time: 00:00:01
Finished recover at 18-MAY-09
RMAN> alter database open;
database opened
RMAN> copy datafile 1 to '+DATA';
Starting backup at 18-MAY-09
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=314 device type=DISK
channel ORA_DISK_1: starting datafile copy
input datafile file number=00001 name=+DATA/x4540/datafile/system.370.687171837
output file name=+DATA/x4540/datafile/system.369.687172089 tag=TAG20090518T090802 RECID=394 STAMP=687172107
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:26
Finished backup at 18-MAY-09
RMAN> startup mount force;
Oracle instance started
database mounted
Total System Global Area 2058981376 bytes
Fixed Size 1300968 bytes
Variable Size 553649688 bytes
Database Buffers 1493172224 bytes
Redo Buffers 10858496 bytes
RMAN> switch datafile 1;
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-00558: error encountered while parsing input commands
RMAN-01009: syntax error: found ";": expecting one of: "comma, to"
RMAN-01007: at line 1 column 18 file: standard input
RMAN> run{
2> switch datafile 1;
3> }
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of switch command at 05/18/2009 09:09:41
RMAN-06039: SET NEWNAME command has not been issued for datafile 1
RMAN> copy datafile 20 to '+DATA';
Starting backup at 18-MAY-09
using channel ORA_DISK_1
channel ORA_DISK_1: starting datafile copy
input datafile file number=00020 name=+DATA/x4540/datafile/academy.327.685962083
output file name=+DATA/x4540/datafile/academy_bts.368.687172365 tag=TAG20090518T091237 RECID=396 STAMP=687172384
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:25
Finished backup at 18-MAY-09
RMAN> sql 'alter database datafile 20 offline';
sql statement: alter database datafile 20 offline
RMAN> run{
2> switch datafile 20 to datafilecopy '+DATA/x4540/datafile/academy_bts.368.687172365';
3> }
datafile 20 switched to datafile copy
input datafile copy RECID=396 STAMP=687172384 file name=+DATA/x4540/datafile/academy_bts.368.687172365
RMAN> recover datafile 20;
Starting recover at 18-MAY-09
using channel ORA_DISK_1
starting media recovery
media recovery complete, elapsed time: 00:00:00
Finished recover at 18-MAY-09
RMAN> sql 'alter database datafile 20 online';
sql statement: alter database datafile 20 online
RMAN> copy datafile 20 to '+DATA';
Starting backup at 18-MAY-09
using channel ORA_DISK_1
channel ORA_DISK_1: starting datafile copy
input datafile file number=00020 name=+DATA/x4540/datafile/academy_bts.368.687172365
output file name=+DATA/x4540/datafile/academy_bts.367.687172763 tag=TAG20090518T091915 RECID=398 STAMP=687172779
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:25
Finished backup at 18-MAY-09
RMAN> sql 'alter database datafile 20 offline';
sql statement: alter database datafile 20 offline
RMAN> run{
2> set newname for datafile 20 to '+DATA/x4540/datafile/academy_bts.367.687172763';
3> switch datafile 20;
4> }
executing command: SET NEWNAME
datafile 20 switched to datafile copy
input datafile copy RECID=398 STAMP=687172779 file name=+DATA/x4540/datafile/academy_bts.367.687172763
RMAN> recover datafile 20;
Starting recover at 18-MAY-09
using channel ORA_DISK_1
starting media recovery
media recovery complete, elapsed time: 00:00:00
Finished recover at 18-MAY-09
RMAN> sql 'alter database datafile 20 online';
sql statement: alter database datafile 20 online
For more refer to
http://download.oracle.com/docs/cd/B19306_01/backup.102/b14194/rcmsynta061.htm "Restrictions and Usage Notes" section.
Regards,
HS
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