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How to export oracle RAC database using expdp


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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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