Poor Performance With DataPump Export On Large Databases
Last updated on OCTOBER 25, 2017
Applies to:Oracle Database - Enterprise Edition - Version 10.2.0.3 and later
Information in this document applies to any platform.
***Checked for relevance on 15-Jan-2016***
The size of dump file is approx. 92 GB.
DataPump export takes almost 24 hours. Traditional export (exp) takes 12 hours consistently.
Check if Dictionary and Fixed Objects statistics have been gathered previously to start the DataPump job or not. The DBA_OPTSTAT_OPERATIONS view is useful in determining the time stamp of statistics modifications :
SQL> select operation, START_TIME, END_TIME from DBA_OPTSTAT_OPERATIONS;
Typically, if Dictionary and Fixed Objects statistics have been previously gathered, then gather_dictionary_stats and gather_fixed_objects_stats values have to be found in DBA_OPTSTAT_OPERATIONS.OPERATION column.
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