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Don Burleson Blog 







What to check when an export "hangs" while exporting definitions

Oracle Database Tips by Donald BurlesonMay 15, 2015

Question: I am running Data Pump export, and it is hanging when exporting the object definitions.  I am exporting the SYS and SYSTEM objects, but I don't know how to diagnose the hanging issue in export.  What do you check when Oracle hangs while exporting object definitions?

Answer: Hanging in export can occur for a variety of reasons.  You can check v$session_wait for details, or run a 10046 trace to see exactly what's wrong. 

For more complete details on diagnosing a hung database with Oracle Utilities, see the book "Advanced Oracle Utilities: The Definitive Reference".

 Common causes of exp hanging when exporting cluster or object definitions include:

- According to MOSC note : 351650.1, check your LD_LIBRARY_PATH set improperly, without ORACLE_HOME/lib first

- There are known issues with "full" exports hanging when exporting SYS and SYSTEM objects. Some recommend running utlrp.sql to re-compile all objects to remedy an export hang.  If you don't need to export the SYS and SYSTEM objects, I would simply redo it, specifying the exact schemas to export.

- Exports can hang if it runs out of disk space, especially on a 32-bit system with a 2-gig file size limit.  In this case, you need to run the split command to split out the dump file.

For complete details on troubleshooting Oracle Data Pump exports, see the book "Advanced Oracle Utilities":

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The landmark book "Advanced Oracle Utilities The Definitive Reference"  contains over 600 pages of filled with valuable information on Oracle's secret utilities. This book includes scripts and tools to hypercharge Oracle 11g performance and you can buy it for 30% off directly from the publisher.



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