Suppose you wish to take a expdp backup of a big table, but you don’t sufficient space in a single mount point to keep the dump. In this case we take expdp dump to multiple directory.
DEMO:
Create 2 directories:
SQL> create directory DIR1 as '/home/oracle/DIR1';
Directory created.
SQL> create directory DIR2 as '/home/oracle/DIR2';
Directory created.
SQL> grant all on directory DIR1 to public;
Grant succeeded.
SQL> grant all on directory DIR2 to public;
Grant succeeded.
Now take export with parallel option:
[oracle@localhost ~]$ expdp dumpfile=DIR1:test_%U.dmp,DIR2:test_%U.dmp logfile=test.log directory=DIR1 parallel=2 tables=raj.test
Export: Release 12.1.0.2.0 - Production on Thu Aug 27 10:56:31 2015
Copyright (c) 1982, 2014, Oracle and/or its affiliates. All rights reserved.
Username: raj/raj@orcl
Connected to: Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, OLAP, Advanced Analytics and Real Application Testing options
Starting "RAJ"."SYS_EXPORT_TABLE_01": raj/********@orcl dumpfile=DIR1:test_%U.dmp,DIR2:test_%U.dmp logfile=test.log directory=DIR1 parallel=2 tables=raj.test
Estimate in progress using BLOCKS method...
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 13 MB
. . exported "RAJ"."TEST" 10.66 MB 93915 rows
Processing object type TABLE_EXPORT/TABLE/TABLE
Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
Processing object type TABLE_EXPORT/TABLE/STATISTICS/MARKER
Master table "RAJ"."SYS_EXPORT_TABLE_01" successfully loaded/unloaded
******************************************************************************
Dump file set for RAJ.SYS_EXPORT_TABLE_01 is:
/home/oracle/DIR1/test_01.dmp
/home/oracle/DIR2/test_01.dmp
Job "RAJ"."SYS_EXPORT_TABLE_01" successfully completed at Thu Aug 27 10:57:09 2015 elapsed 0 00:00:31
Now you can see the dump file has been created in multiple directories.
Dump file set for RAJ.SYS_EXPORT_TABLE_01 is:
/home/oracle/DIR1/test_01.dmp
/home/oracle/DIR2/test_01.dmp
/home/oracle/DIR1/test_01.dmp
/home/oracle/DIR2/test_01.dmp
If you wish to compress the size , then you can use compression=all in the expdp command.
For import also you can use the similar method.
[oracle@localhost ~]$ impdp dumpfile=DIR1:test_%U.dmp,DIR2:test_%U.dmp logfile=test1.log directory=DIR1 parallel=2 tables=raj.test table_exists_action=REPLACE
Import: Release 12.1.0.2.0 - Production on Thu Aug 27 11:28:22 2015
Copyright (c) 1982, 2014, Oracle and/or its affiliates. All rights reserved.
Username: raj/raj@orcl
Connected to: Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, OLAP, Advanced Analytics and Real Application Testing options
Master table "RAJ"."SYS_IMPORT_TABLE_01" successfully loaded/unloaded
Starting "RAJ"."SYS_IMPORT_TABLE_01": raj/********@orcl dumpfile=DIR1:test_%U.dmp,DIR2:test_%U.dmp logfile=test1.log directory=DIR1 parallel=2 tables=raj.test table_exists_action=REPLACE
Processing object type TABLE_EXPORT/TABLE/TABLE
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
. . imported "RAJ"."TEST" 10.66 MB 93915 rows
Processing object type TABLE_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
Processing object type TABLE_EXPORT/TABLE/STATISTICS/MARKER
Job "RAJ"."SYS_IMPORT_TABLE_01" successfully completed at Thu Aug 27 11:29:05 2015 elapsed 0 00:00:35
FYI- To use compression parameter in expdp , we need additional Advanced compression license,( Which is not included in enterprise edition)
