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Data Pump Impdp/expdp optimal parallel tips

Oracle Database Tips by Donald BurlesonDecember 17, 2015

Question:  What is the optimal degree of parallelism for the Oracle data pump export utility?  The expdp command has a parallel argument, and I need to run it in parallel.

Answer:  As a general rule for processes you find the cpu_count parameter (v$parameter) and use cpu-count-1.  However. the Oracle Utilities documentation makes a slightly different recommendation for using a Data Pump export

  • Set the degree of parallelism to two times the number of CPUs, then tune from there.
  • For Data Pump Export, the PARALLEL parameter value should be less than or equal to the number of output dump files.
  • For Data Pump Import, the PARALLEL parameter value should not be much larger than the number of files in the dump file set.

Oracle Corporation specifies these rules of thumb for setting the optimal degree of parallelism.  Also see these notes on creating Data Pump expdp multiple dmp files

 
 
 
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