Since in Oracle Database 12c we can now use Active Duplicate using Backup set we also have another option, create that backupset Compressed, in that case what we are doing is to compress the BackupSet in order to send less bytes via Network, so imagine that you are duplicating a database and you would like to reduce the amount of bytes to transfer in order to impact less the network, this is a good feature for you. This feature Enables binary compression of the data transfer from the source database to the auxiliary database, The advantage of this is reducing the network bandwidth consumption. Let' see how does it work. In this example I am using 2 databases, db1 (Target database) db2 (Auxiliary database) I will proceed to do two duplications, the first one will be using normal Active Duplicate like if we were in 11g, and the second duplicate will be using "Compressed Backupset" and I will capture some stats of the session that transfered the bytes via network in order to confirm if less data was transferred. Normal Active Duplicate: [oracle@db12102 db2]$ rman target sys/manager1@db1 auxiliary=sys/manager1@db2 Recovery Manager: Release 12.1.0.2.0 - Production on Sun May 29 17:03:17 2016 Copyright (c) 1982, 2014, Oracle and/or its affiliates. All rights reserved. connected to target database: DB1 (DBID=1506943872) connected to auxiliary database: DB2 (not mounted) RMAN> DUPLICATE TARGET DATABASE TO 'DB2' FROM ACTIVE DATABASE; Starting Duplicate Db at 29-MAY-16 using target database control file instead of recovery catalog allocated channel: ORA_AUX_DISK_1 channel ORA_AUX_DISK_1: SID=22 device type=DISK current log archived contents of Memory Script: { sql clone "alter system set control_files = ''/data/db2/DB2/controlfile/o1_mf_cnnz809t_.ctl'', ''/data/db2/DB2/controlfile/o1_mf_cnnz80by_.ctl'' comment= ''Set by RMAN'' scope=spfile"; sql clone "alter system set db_name = ''DB1'' comment= ''Modified by RMAN duplicate'' scope=spfile"; sql clone "alter system set db_unique_name = ''DB2'' comment= ''Modified by RMAN duplicate'' scope=spfile"; shutdown clone immediate; startup clone force nomount restore clone from service 'db1' primary controlfile; alter clone database mount; } executing Memory Script sql statement: alter system set control_files = ''/data/db2/DB2/controlfile/o1_mf_cnnz809t_.ctl'', ''/data/db2/DB2/controlfile/o1_mf_cnnz80by_.ctl'' comment= ''Set by RMAN'' scope=spfile sql statement: alter system set db_name = ''DB1'' comment= ''Modified by RMAN duplicate'' scope=spfile sql statement: alter system set db_unique_name = ''DB2'' comment= ''Modified by RMAN duplicate'' scope=spfile Oracle instance shut down Oracle instance started Total System Global Area 767557632 bytes Fixed Size 2929112 bytes Variable Size 310382120 bytes Database Buffers 448790528 bytes Redo Buffers 5455872 bytes Starting restore at 29-MAY-16 allocated channel: ORA_AUX_DISK_1 channel ORA_AUX_DISK_1: SID=21 device type=DISK channel ORA_AUX_DISK_1: starting datafile backup set restore channel ORA_AUX_DISK_1: using network backup set from service db1 channel ORA_AUX_DISK_1: restoring control file channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:01 output file name=/data/db2/DB2/controlfile/o1_mf_cnnz809t_.ctl output file name=/data/db2/DB2/controlfile/o1_mf_cnnz80by_.ctl Finished restore at 29-MAY-16 database mounted contents of Memory Script: { set newname for datafile 1 to "/data/db2/DB1/datafile/o1_mf_system_cnnz5sx2_.dbf"; set newname for datafile 3 to "/data/db2/DB1/datafile/o1_mf_sysaux_cnnz42rx_.dbf"; set newname for datafile 4 to "/data/db2/DB1/datafile/o1_mf_undotbs1_cnnz784o_.dbf"; set newname for datafile 5 to "/data/db2/DB1/datafile/o1_mf_users_cnony92f_.dbf"; set newname for datafile 6 to "/data/db2/DB1/datafile/o1_mf_users_cnnz774t_.dbf"; restore from service 'db1' clone database ; sql 'alter system archive log current'; } executing Memory Script executing command: SET NEWNAME executing command: SET NEWNAME executing command: SET NEWNAME executing command: SET NEWNAME executing command: SET NEWNAME Starting restore at 29-MAY-16 using channel ORA_AUX_DISK_1 channel ORA_AUX_DISK_1: starting datafile backup set restore channel ORA_AUX_DISK_1: using network backup set from service db1 channel ORA_AUX_DISK_1: specifying datafile(s) to restore from backup set channel ORA_AUX_DISK_1: restoring datafile 00001 to /data/db2/DB1/datafile/o1_mf_system_cnnz5sx2_.dbf channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:15 channel ORA_AUX_DISK_1: starting datafile backup set restore channel ORA_AUX_DISK_1: using network backup set from service db1 channel ORA_AUX_DISK_1: specifying datafile(s) to restore from backup set channel ORA_AUX_DISK_1: restoring datafile 00003 to /data/db2/DB1/datafile/o1_mf_sysaux_cnnz42rx_.dbf channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:08 channel ORA_AUX_DISK_1: starting datafile backup set restore channel ORA_AUX_DISK_1: using network backup set from service db1 channel ORA_AUX_DISK_1: specifying datafile(s) to restore from backup set channel ORA_AUX_DISK_1: restoring datafile 00004 to /data/db2/DB1/datafile/o1_mf_undotbs1_cnnz784o_.dbf channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:01 channel ORA_AUX_DISK_1: starting datafile backup set restore channel ORA_AUX_DISK_1: using network backup set from service db1 channel ORA_AUX_DISK_1: specifying datafile(s) to restore from backup set channel ORA_AUX_DISK_1: restoring datafile 00005 to /data/db2/DB1/datafile/o1_mf_users_cnony92f_.dbf channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:07 channel ORA_AUX_DISK_1: starting datafile backup set restore channel ORA_AUX_DISK_1: using network backup set from service db1 channel ORA_AUX_DISK_1: specifying datafile(s) to restore from backup set channel ORA_AUX_DISK_1: restoring datafile 00006 to /data/db2/DB1/datafile/o1_mf_users_cnnz774t_.dbf channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:01 Finished restore at 29-MAY-16 sql statement: alter system archive log current current log archived contents of Memory Script: { restore clone force from service 'db1' archivelog from scn 1705909; switch clone datafile all; } executing Memory Script Starting restore at 29-MAY-16 using channel ORA_AUX_DISK_1 channel ORA_AUX_DISK_1: starting archived log restore to default destination channel ORA_AUX_DISK_1: using network backup set from service db1 channel ORA_AUX_DISK_1: restoring archived log archived log thread=1 sequence=35 channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:01 channel ORA_AUX_DISK_1: starting archived log restore to default destination channel ORA_AUX_DISK_1: using network backup set from service db1 channel ORA_AUX_DISK_1: restoring archived log archived log thread=1 sequence=36 channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:01 Finished restore at 29-MAY-16 datafile 1 switched to datafile copy input datafile copy RECID=6 STAMP=913136672 file name=/data/db2/DB1/datafile/o1_mf_system_cnnz5sx2_.dbf datafile 3 switched to datafile copy input datafile copy RECID=7 STAMP=913136672 file name=/data/db2/DB1/datafile/o1_mf_sysaux_cnnz42rx_.dbf datafile 4 switched to datafile copy input datafile copy RECID=8 STAMP=913136672 file name=/data/db2/DB1/datafile/o1_mf_undotbs1_cnnz784o_.dbf datafile 5 switched to datafile copy input datafile copy RECID=9 STAMP=913136672 file name=/data/db2/DB1/datafile/o1_mf_users_cnony92f_.dbf datafile 6 switched to datafile copy input datafile copy RECID=10 STAMP=913136672 file name=/data/db2/DB1/datafile/o1_mf_users_cnnz774t_.dbf contents of Memory Script: { set until scn 1706150; recover clone database delete archivelog ; } executing Memory Script executing command: SET until clause Starting recover at 29-MAY-16 using channel ORA_AUX_DISK_1 starting media recovery archived log for thread 1 with sequence 35 is already on disk as file /data/db2/DB2/archivelog/2016_05_29/o1_mf_1_35_cnppbybw_.arc archived log for thread 1 with sequence 36 is already on disk as file /data/db2/DB2/archivelog/2016_05_29/o1_mf_1_36_cnppbzkp_.arc archived log file name=/data/db2/DB2/archivelog/2016_05_29/o1_mf_1_35_cnppbybw_.arc thread=1 sequence=35 archived log file name=/data/db2/DB2/archivelog/2016_05_29/o1_mf_1_36_cnppbzkp_.arc thread=1 sequence=36 media recovery complete, elapsed time: 00:00:00 Finished recover at 29-MAY-16 Oracle instance started Total System Global Area 767557632 bytes Fixed Size 2929112 bytes Variable Size 310382120 bytes Database Buffers 448790528 bytes Redo Buffers 5455872 bytes contents of Memory Script: { sql clone "alter system set db_name = ''DB2'' comment= ''Reset to original value by RMAN'' scope=spfile"; sql clone "alter system reset db_unique_name scope=spfile"; } executing Memory Script sql statement: alter system set db_name = ''DB2'' comment= ''Reset to original value by RMAN'' scope=spfile sql statement: alter system reset db_unique_name scope=spfile Oracle instance started Total System Global Area 767557632 bytes Fixed Size 2929112 bytes Variable Size 310382120 bytes Database Buffers 448790528 bytes Redo Buffers 5455872 bytes sql statement: CREATE CONTROLFILE REUSE SET DATABASE "DB2" RESETLOGS ARCHIVELOG MAXLOGFILES 16 MAXLOGMEMBERS 3 MAXDATAFILES 100 MAXINSTANCES 8 MAXLOGHISTORY 292 LOGFILE GROUP 1 SIZE 50 M , GROUP 2 SIZE 50 M , GROUP 3 SIZE 50 M DATAFILE '/data/db2/DB1/datafile/o1_mf_system_cnnz5sx2_.dbf' CHARACTER SET WE8MSWIN1252 contents of Memory Script: { set newname for tempfile 1 to "/data/db2/DB1/datafile/o1_mf_temp_cnnz83hz_.tmp"; switch clone tempfile all; catalog clone datafilecopy "/data/db2/DB1/datafile/o1_mf_sysaux_cnnz42rx_.dbf", "/data/db2/DB1/datafile/o1_mf_undotbs1_cnnz784o_.dbf", "/data/db2/DB1/datafile/o1_mf_users_cnony92f_.dbf", "/data/db2/DB1/datafile/o1_mf_users_cnnz774t_.dbf"; switch clone datafile all; } executing Memory Script executing command: SET NEWNAME renamed tempfile 1 to /data/db2/DB1/datafile/o1_mf_temp_cnnz83hz_.tmp in control file cataloged datafile copy datafile copy file name=/data/db2/DB1/datafile/o1_mf_sysaux_cnnz42rx_.dbf RECID=1 STAMP=913136695 cataloged datafile copy datafile copy file name=/data/db2/DB1/datafile/o1_mf_undotbs1_cnnz784o_.dbf RECID=2 STAMP=913136695 cataloged datafile copy datafile copy file name=/data/db2/DB1/datafile/o1_mf_users_cnony92f_.dbf RECID=3 STAMP=913136695 cataloged datafile copy datafile copy file name=/data/db2/DB1/datafile/o1_mf_users_cnnz774t_.dbf RECID=4 STAMP=913136695 datafile 3 switched to datafile copy input datafile copy RECID=1 STAMP=913136695 file name=/data/db2/DB1/datafile/o1_mf_sysaux_cnnz42rx_.dbf datafile 4 switched to datafile copy input datafile copy RECID=2 STAMP=913136695 file name=/data/db2/DB1/datafile/o1_mf_undotbs1_cnnz784o_.dbf datafile 5 switched to datafile copy input datafile copy RECID=3 STAMP=913136695 file name=/data/db2/DB1/datafile/o1_mf_users_cnony92f_.dbf datafile 6 switched to datafile copy input datafile copy RECID=4 STAMP=913136695 file name=/data/db2/DB1/datafile/o1_mf_users_cnnz774t_.dbf contents of Memory Script: { Alter clone database open resetlogs; } executing Memory Script database opened Finished Duplicate Db at 29-MAY-16 RMAN> exit Now let me preset you some stats captured for the session that was transferring the data: SID STAT NAME VALUE ------------------------------------------------------------------------ 40 bytes sent via SQL*Net to client 2041 40 bytes sent via SQL*Net to client 33557432 40 bytes sent via SQL*Net to client 140513000 40 bytes sent via SQL*Net to client 291509096 40 bytes sent via SQL*Net to client 423630680 40 bytes sent via SQL*Net to client 534780584 40 bytes sent via SQL*Net to client 644881904 40 bytes sent via SQL*Net to client 703602863 40 bytes sent via SQL*Net to client 703602863 40 bytes sent via SQL*Net to client 703602863 40 bytes sent via SQL*Net to client 703602863 40 bytes sent via SQL*Net to client 703602863 40 bytes sent via SQL*Net to client 703602863 And now let's do a second Duplicate using Compressed Bakupsets, Compressed Backupset: [oracle@db12102 db2]$ rman target sys/manager1@db1 auxiliary=sys/manager1@db2 Recovery Manager: Release 12.1.0.2.0 - Production on Sun May 29 17:24:34 2016 Copyright (c) 1982, 2014, Oracle and/or its affiliates. All rights reserved. connected to target database: DB1 (DBID=1506943872) connected to auxiliary database: DB2 (not mounted) RMAN> DUPLICATE TARGET DATABASE TO 'DB2' FROM ACTIVE DATABASE USING COMPRESSED BACKUPSET; 2> 3> Starting Duplicate Db at 29-MAY-16 using target database control file instead of recovery catalog allocated channel: ORA_AUX_DISK_1 channel ORA_AUX_DISK_1: SID=22 device type=DISK current log archived contents of Memory Script: { sql clone "alter system set control_files = ''/data/db2/DB2/controlfile/o1_mf_cnnz809t_.ctl'', ''/data/db2/DB2/controlfile/o1_mf_cnnz80by_.ctl'' comment= ''Set by RMAN'' scope=spfile"; sql clone "alter system set db_name = ''DB1'' comment= ''Modified by RMAN duplicate'' scope=spfile"; sql clone "alter system set db_unique_name = ''DB2'' comment= ''Modified by RMAN duplicate'' scope=spfile"; shutdown clone immediate; startup clone force nomount restore clone from service 'db1' using compressed backupset primary controlfile; alter clone database mount; } executing Memory Script sql statement: alter system set control_files = ''/data/db2/DB2/controlfile/o1_mf_cnnz809t_.ctl'', ''/data/db2/DB2/controlfile/o1_mf_cnnz80by_.ctl'' comment= ''Set by RMAN'' scope=spfile sql statement: alter system set db_name = ''DB1'' comment= ''Modified by RMAN duplicate'' scope=spfile sql statement: alter system set db_unique_name = ''DB2'' comment= ''Modified by RMAN duplicate'' scope=spfile Oracle instance shut down Oracle instance started Total System Global Area 767557632 bytes Fixed Size 2929112 bytes Variable Size 310382120 bytes Database Buffers 448790528 bytes Redo Buffers 5455872 bytes Starting restore at 29-MAY-16 allocated channel: ORA_AUX_DISK_1 channel ORA_AUX_DISK_1: SID=21 device type=DISK channel ORA_AUX_DISK_1: starting datafile backup set restore channel ORA_AUX_DISK_1: using compressed network backup set from service db1 channel ORA_AUX_DISK_1: restoring control file channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:02 output file name=/data/db2/DB2/controlfile/o1_mf_cnnz809t_.ctl output file name=/data/db2/DB2/controlfile/o1_mf_cnnz80by_.ctl Finished restore at 29-MAY-16 database mounted contents of Memory Script: { set newname for datafile 1 to "/data/db2/DB1/datafile/o1_mf_system_cnnz5sx2_.dbf"; set newname for datafile 3 to "/data/db2/DB1/datafile/o1_mf_sysaux_cnnz42rx_.dbf"; set newname for datafile 4 to "/data/db2/DB1/datafile/o1_mf_undotbs1_cnnz784o_.dbf"; set newname for datafile 5 to "/data/db2/DB1/datafile/o1_mf_users_cnony92f_.dbf"; set newname for datafile 6 to "/data/db2/DB1/datafile/o1_mf_users_cnnz774t_.dbf"; restore from service 'db1' using compressed backupset clone database ; sql 'alter system archive log current'; } executing Memory Script executing command: SET NEWNAME executing command: SET NEWNAME executing command: SET NEWNAME executing command: SET NEWNAME executing command: SET NEWNAME Starting restore at 29-MAY-16 using channel ORA_AUX_DISK_1 channel ORA_AUX_DISK_1: starting datafile backup set restore channel ORA_AUX_DISK_1: using compressed network backup set from service db1 channel ORA_AUX_DISK_1: specifying datafile(s) to restore from backup set channel ORA_AUX_DISK_1: restoring datafile 00001 to /data/db2/DB1/datafile/o1_mf_system_cnnz5sx2_.dbf channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:01:45 channel ORA_AUX_DISK_1: starting datafile backup set restore channel ORA_AUX_DISK_1: using compressed network backup set from service db1 channel ORA_AUX_DISK_1: specifying datafile(s) to restore from backup set channel ORA_AUX_DISK_1: restoring datafile 00003 to /data/db2/DB1/datafile/o1_mf_sysaux_cnnz42rx_.dbf channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:01:05 channel ORA_AUX_DISK_1: starting datafile backup set restore channel ORA_AUX_DISK_1: using compressed network backup set from service db1 channel ORA_AUX_DISK_1: specifying datafile(s) to restore from backup set channel ORA_AUX_DISK_1: restoring datafile 00004 to /data/db2/DB1/datafile/o1_mf_undotbs1_cnnz784o_.dbf channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:01 channel ORA_AUX_DISK_1: starting datafile backup set restore channel ORA_AUX_DISK_1: using compressed network backup set from service db1 channel ORA_AUX_DISK_1: specifying datafile(s) to restore from backup set channel ORA_AUX_DISK_1: restoring datafile 00005 to /data/db2/DB1/datafile/o1_mf_users_cnony92f_.dbf channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:07 channel ORA_AUX_DISK_1: starting datafile backup set restore channel ORA_AUX_DISK_1: using compressed network backup set from service db1 channel ORA_AUX_DISK_1: specifying datafile(s) to restore from backup set channel ORA_AUX_DISK_1: restoring datafile 00006 to /data/db2/DB1/datafile/o1_mf_users_cnnz774t_.dbf channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:02 Finished restore at 29-MAY-16 sql statement: alter system archive log current current log archived contents of Memory Script: { restore clone force from service 'db1' using compressed backupset archivelog from scn 1908947; switch clone datafile all; } executing Memory Script Starting restore at 29-MAY-16 using channel ORA_AUX_DISK_1 channel ORA_AUX_DISK_1: starting archived log restore to default destination channel ORA_AUX_DISK_1: using compressed network backup set from service db1 channel ORA_AUX_DISK_1: restoring archived log archived log thread=1 sequence=43 channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:01 channel ORA_AUX_DISK_1: starting archived log restore to default destination channel ORA_AUX_DISK_1: using compressed network backup set from service db1 channel ORA_AUX_DISK_1: restoring archived log archived log thread=1 sequence=44 channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:01 Finished restore at 29-MAY-16 datafile 1 switched to datafile copy input datafile copy RECID=6 STAMP=913138103 file name=/data/db2/DB1/datafile/o1_mf_system_cnnz5sx2_.dbf datafile 3 switched to datafile copy input datafile copy RECID=7 STAMP=913138103 file name=/data/db2/DB1/datafile/o1_mf_sysaux_cnnz42rx_.dbf datafile 4 switched to datafile copy input datafile copy RECID=8 STAMP=913138103 file name=/data/db2/DB1/datafile/o1_mf_undotbs1_cnnz784o_.dbf datafile 5 switched to datafile copy input datafile copy RECID=9 STAMP=913138103 file name=/data/db2/DB1/datafile/o1_mf_users_cnony92f_.dbf datafile 6 switched to datafile copy input datafile copy RECID=10 STAMP=913138104 file name=/data/db2/DB1/datafile/o1_mf_users_cnnz774t_.dbf contents of Memory Script: { set until scn 1909259; recover clone database delete archivelog ; } executing Memory Script executing command: SET until clause Starting recover at 29-MAY-16 using channel ORA_AUX_DISK_1 starting media recovery archived log for thread 1 with sequence 43 is already on disk as file /data/db2/DB2/archivelog/2016_05_29/o1_mf_1_43_cnpqqook_.arc archived log for thread 1 with sequence 44 is already on disk as file /data/db2/DB2/archivelog/2016_05_29/o1_mf_1_44_cnpqqpvx_.arc archived log file name=/data/db2/DB2/archivelog/2016_05_29/o1_mf_1_43_cnpqqook_.arc thread=1 sequence=43 archived log file name=/data/db2/DB2/archivelog/2016_05_29/o1_mf_1_44_cnpqqpvx_.arc thread=1 sequence=44 media recovery complete, elapsed time: 00:00:00 Finished recover at 29-MAY-16 Oracle instance started Total System Global Area 767557632 bytes Fixed Size 2929112 bytes Variable Size 310382120 bytes Database Buffers 448790528 bytes Redo Buffers 5455872 bytes contents of Memory Script: { sql clone "alter system set db_name = ''DB2'' comment= ''Reset to original value by RMAN'' scope=spfile"; sql clone "alter system reset db_unique_name scope=spfile"; } executing Memory Script sql statement: alter system set db_name = ''DB2'' comment= ''Reset to original value by RMAN'' scope=spfile sql statement: alter system reset db_unique_name scope=spfile Oracle instance started Total System Global Area 767557632 bytes Fixed Size 2929112 bytes Variable Size 310382120 bytes Database Buffers 448790528 bytes Redo Buffers 5455872 bytes sql statement: CREATE CONTROLFILE REUSE SET DATABASE "DB2" RESETLOGS ARCHIVELOG MAXLOGFILES 16 MAXLOGMEMBERS 3 MAXDATAFILES 100 MAXINSTANCES 8 MAXLOGHISTORY 292 LOGFILE GROUP 1 SIZE 50 M , GROUP 2 SIZE 50 M , GROUP 3 SIZE 50 M DATAFILE '/data/db2/DB1/datafile/o1_mf_system_cnnz5sx2_.dbf' CHARACTER SET WE8MSWIN1252 contents of Memory Script: { set newname for tempfile 1 to "/data/db2/DB1/datafile/o1_mf_temp_cnnz83hz_.tmp"; switch clone tempfile all; catalog clone datafilecopy "/data/db2/DB1/datafile/o1_mf_sysaux_cnnz42rx_.dbf", "/data/db2/DB1/datafile/o1_mf_undotbs1_cnnz784o_.dbf", "/data/db2/DB1/datafile/o1_mf_users_cnony92f_.dbf", "/data/db2/DB1/datafile/o1_mf_users_cnnz774t_.dbf"; switch clone datafile all; } executing Memory Script executing command: SET NEWNAME renamed tempfile 1 to /data/db2/DB1/datafile/o1_mf_temp_cnnz83hz_.tmp in control file cataloged datafile copy datafile copy file name=/data/db2/DB1/datafile/o1_mf_sysaux_cnnz42rx_.dbf RECID=1 STAMP=913138126 cataloged datafile copy datafile copy file name=/data/db2/DB1/datafile/o1_mf_undotbs1_cnnz784o_.dbf RECID=2 STAMP=913138126 cataloged datafile copy datafile copy file name=/data/db2/DB1/datafile/o1_mf_users_cnony92f_.dbf RECID=3 STAMP=913138126 cataloged datafile copy datafile copy file name=/data/db2/DB1/datafile/o1_mf_users_cnnz774t_.dbf RECID=4 STAMP=913138126 datafile 3 switched to datafile copy input datafile copy RECID=1 STAMP=913138126 file name=/data/db2/DB1/datafile/o1_mf_sysaux_cnnz42rx_.dbf datafile 4 switched to datafile copy input datafile copy RECID=2 STAMP=913138126 file name=/data/db2/DB1/datafile/o1_mf_undotbs1_cnnz784o_.dbf datafile 5 switched to datafile copy input datafile copy RECID=3 STAMP=913138126 file name=/data/db2/DB1/datafile/o1_mf_users_cnony92f_.dbf datafile 6 switched to datafile copy input datafile copy RECID=4 STAMP=913138126 file name=/data/db2/DB1/datafile/o1_mf_users_cnnz774t_.dbf contents of Memory Script: { Alter clone database open resetlogs; } executing Memory Script database opened Finished Duplicate Db at 29-MAY-16 RMAN> And now let me show you some Statistics and you will see that less data was transferred: SID STAT NAME VALUE ------------------------------------------------------------------------ 49 bytes sent via SQL*Net to client 2041 49 bytes sent via SQL*Net to client 3148506 49 bytes sent via SQL*Net to client 4197090 49 bytes sent via SQL*Net to client 6294258 49 bytes sent via SQL*Net to client 8391426 49 bytes sent via SQL*Net to client 11537178 49 bytes sent via SQL*Net to client 15731514 49 bytes sent via SQL*Net to client 18877266 49 bytes sent via SQL*Net to client 20974434 49 bytes sent via SQL*Net to client 28314522 49 bytes sent via SQL*Net to client 31460274 49 bytes sent via SQL*Net to client 33557442 49 bytes sent via SQL*Net to client 36703194 49 bytes sent via SQL*Net to client 38800362 49 bytes sent via SQL*Net to client 41946114 49 bytes sent via SQL*Net to client 49286202 49 bytes sent via SQL*Net to client 52431954 49 bytes sent via SQL*Net to client 55577706 49 bytes sent via SQL*Net to client 57674874 49 bytes sent via SQL*Net to client 59772042 49 bytes sent via SQL*Net to client 62917794 49 bytes sent via SQL*Net to client 68160714 49 bytes sent via SQL*Net to client 70257882 49 bytes sent via SQL*Net to client 77597970 49 bytes sent via SQL*Net to client 80743722 49 bytes sent via SQL*Net to client 83889474 49 bytes sent via SQL*Net to client 87035226 49 bytes sent via SQL*Net to client 90180978 49 bytes sent via SQL*Net to client 97521066 49 bytes sent via SQL*Net to client 100666818 49 bytes sent via SQL*Net to client 111152658 49 bytes sent via SQL*Net to client 119541330 49 bytes sent via SQL*Net to client 122687082 49 bytes sent via SQL*Net to client 124784250 49 bytes sent via SQL*Net to client 127930002 49 bytes sent via SQL*Net to client 130027170 49 bytes sent via SQL*Net to client 133172922 49 bytes sent via SQL*Net to client 136318674 49 bytes sent via SQL*Net to client 138415842 49 bytes sent via SQL*Net to client 148901682 49 bytes sent via SQL*Net to client 150998850 49 bytes sent via SQL*Net to client 159387522 49 bytes sent via SQL*Net to client 167776194 49 bytes sent via SQL*Net to client 169873362 49 bytes sent via SQL*Net to client 175116282 49 bytes sent via SQL*Net to client 178262034 49 bytes sent via SQL*Net to client 188747874 49 bytes sent via SQL*Net to client 191893626 49 bytes sent via SQL*Net to client 195039378 49 bytes sent via SQL*Net to client 197136546 49 bytes sent via SQL*Net to client 208670970 49 bytes sent via SQL*Net to client 211816722 49 bytes sent via SQL*Net to client 214962474 49 bytes sent via SQL*Net to client 217059680 49 bytes sent via SQL*Net to client 217059897 As you can see less data was transferred when we used "Compressed Backupset" in Active Duplicate, it reduced my data a lot, of course this depends on the scenario, but for sure this is a new feature that you can use and take advantage. 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