How to export oracle RAC database using expdp

Running expdp on Multiple RAC Instances in Parallel

There are few points which must be considered while running an export job on oracle RAC database.

Whether you wish to start the export job on all or selected list of Instances or on the Instances where from you are invoking expdp.
If you are using CLUSTER=YES (by default) you are starting export worker process on other Oracle RAC instances too.
If you are using CLUSTER=YES (by default) then the shared directory path must be available on all the Instances.
Use of the CLUSTER=YES parameter may affect performance because there is some additional overhead in distributing the export job across Oracle RAC instances. For small jobs, it may be better to specify CLUSTER=NO.

Example:
parfile content
directory=ASM_DUMP
dumpfile=EXP_TEST_%U.dmp
FILESIZE=10G
logfile=EXT:EXP_TEST.log
schemas=TEST01
CLUSTER=NO

TNS Used by expdp
Note: It resolves cluster and therefore can connect to any instance of the cluster
TEST_EXP =
(DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = rac01-scan.oracle.com)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = test.oracle.com)
    )
)

$ tnsping TEST_EXP
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = rac01-scan.oracle.com)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = test.oracle.com)))
OK (10 msec)

$ expdp system@TEST_EXP parfile=TEST_EXP.par
Export: Release 12.1.0.2.0 - Production on Wed Oct 10 15:04:20 2018
Copyright (c) 1982, 2014, Oracle and/or its affiliates. All rights reserved.
Password:
Connected to: Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, Oracle Label Security,
OLAP, Advanced Analytics and Real Application Testing options
Starting "SYSTEM"."SYS_EXPORT_SCHEMA_02": system/********@TEST_EXP parfile=TEST_EXP.par
Estimate in progress using BLOCKS method...
Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 267.7 GB.........
....................................................................................................................................................

....................................................................................................................................................

Export> status
Job: SYS_EXPORT_SCHEMA_02
Operation: EXPORT
Mode: SCHEMA
State: EXECUTING
Bytes Processed: 0
Current Parallelism: 1
Job Error Count: 0
Dump File: +DATA/exp/EXP_TEST_01.dmp
    size: 10,737,418,240
    bytes written: 4,096
Dump File: +DATA/exp/EXP_TEST_%u.dmp
    size: 10,737,418,240
Worker 1 Status:
Instance ID: 1
Instance name: TEST1
Host name: node1.oracle.com
Process Name: DW00
State: EXECUTING
Object Schema: TEST01
Object Name: TEST
Object Type: SCHEMA_EXPORT/TABLE/CONSTRAINT/CONSTRAINT
Completed Objects: 720
Worker Parallelism: 1

Note: As you can see export stared on node1 (TEST1 Instance).
Let us make a little change in parameter file and start the export with this new parfile

parfile content

directory=ASM_DUMP
dumpfile=EXP_TEST_%U.dmp
FILESIZE=10G
logfile=EXT:EXP_TEST.log
schemas=TEST01
CLUSTER=YES
PARALLEL=4
$ expdp system@TEST_EXP parfile=TEST_EXP.par
Export: Release 12.1.0.2.0 - Production on Wed Oct 10 15:43:40 2018
Copyright (c) 1982, 2014, Oracle and/or its affiliates. All rights reserved.
Password:
Connected to: Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, Oracle Label Security,
OLAP, Advanced Analytics and Real Application Testing options
Starting "SYSTEM"."SYS_EXPORT_SCHEMA_03": system/********@TEST_EXP parfile=TEST_EXP.par
Estimate in progress using BLOCKS method...

...................................................................................................................................................

....................................................................................................................................................

Export> status

Job: SYS_EXPORT_SCHEMA_03
Operation: EXPORT
Mode: SCHEMA
State: EXECUTING
Bytes Processed: 0
Current Parallelism: 4
Job Error Count: 0
Dump File: +DATA/exp/EXP_TEST_%u.dmp
    size: 10,737,418,240
Dump File: +DATA/exp/EXP_TEST_01.dmp
    size: 10,737,418,240
    bytes written: 4,096
Dump File: +DATA/exp/EXP_TEST_02.dmp
    size: 10,737,418,240
    bytes written: 4,096
Dump File: +DATA/exp/EXP_TEST_03.dmp
    size: 10,737,418,240
    bytes written: 4,096
Dump File: +DATA/exp/EXP_TEST_04.dmp
    size: 10,737,418,240
    bytes written: 4,096
Worker 1 Status:
Instance ID: 1
Instance name: TEST1
Host name:node1.oracle.com
Process Name: DW00
State: EXECUTING
Object Schema: TEST01
Object Name: EMP
Object Type: SCHEMA_EXPORT/TABLE/TABLE
Completed Objects: 842
Worker Parallelism: 1
Worker 2 Status:
Instance ID: 2
Instance name: TEST2
Host name: node2.oracle.com
Process Name: DW00
State: EXECUTING
Object Schema: TEST01
Object Name: EMP_HIST
Object Type: SCHEMA_EXPORT/TABLE/TABLE_DATA
Completed Objects: 1
Total Objects: 13,115
Worker Parallelism: 1
Worker 3 Status:
Instance ID: 1
Instance name: TEST1
Host name: node1.oracle.com
Process Name: DW02
State: EXECUTING
Object Schema: TEST01
Object Name: DEPT
Object Type: SCHEMA_EXPORT/TABLE/TABLE_DATA
Completed Objects: 1
Total Objects: 13,115
Completed Rows: 1,307,382
Worker Parallelism: 1
Worker 4 Status:
Instance ID: 2
Instance name: TEST2
Host name:node2.oracle.com
Process Name: DW01
State: EXECUTING
Object Schema: TEST01
Object Name: LOG
Object Type: SCHEMA_EXPORT/TABLE/TABLE_DATA
Completed Objects: 1
Total Objects: 13,115
Worker Parallelism: 1

Note: As you can see export stared on both the nodes node1 & node2 (TEST1 & TEST2 Instance).

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