ORA-04021: timeout occurred while waiting to lock object

[pejantan4u]

Dear gurus,

I had this message when i tried to export a schema, please tell me why
this happens?

i ran this script, exp schema/schema@sid file=schema.dmp

thanks

[joel garry]

Oracle 9 and 10 should have an object identifier at the end of the
error to give you a clue. You can also use various scripts or tools
to see what is locked. It helps to say your exact version, there's an
O9 bug having to do with compiling pl/sql, another one with smon
locking undo (which might show up if you have read consistency issues
trying to export while others update). 10.1 has a bug if you are
doing any DDL while exporting, see Note:298968.1.

Metalink Note: 169139.1 is the basic description on how to figure out
the problem. It's best to do exports when no one is on, and check the
utilities manual for the consistent parameter.

jg
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