UDUMP

From Oracle FAQ
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UDUMP is the database's USER DUMP DIRECTORY. 

SQL> SHOW PARAMETERS user_dump_dest

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
user_dump_dest                       string      /app/oracle/admin/o102/udump

To change: 

SQL> ALTER SYSTEM SET user_dump_dest = '/app/oracle/admin/o102/udump' SCOPE=both;

System altered.

Also See

  • SQL Trace - procedure describing how to write to UDUMP
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