Can somebody explain this error?
ORA-00054: Resource busy and aquire with NOWAIT specified
This error came in a DROP TABLE. Because of it, procedures and packages are not getting compiled.
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Answer
ORA-00054 means some other session has a lock on a database object which prevents our action from completely successfully.
Your scenario as you present it is a trifle confused, but basically somebody has a lock on the table – probably they are xecuting some DML against it – and you won’t be able to drop it until they release that lock (i.e. commit or rollback).
Having said all which I’m not sure why you’d want to drop a table to fix a PL/SQL compilation problem. You should revise your question to give us a clearer picture of what you’re trying to achieve.