PL/SQL packages containing DB Links suddenly becomes invalid

Hi all --
I was wondering in anyone has come accross the issue my data warehouse team has been experiencing with PL/SQL packages utilizing DB Links. We currently use db links to load some of the data from our transactional databases into the data warehouse tables. The packages once compiled remain valid for a short period of time and then suddenly become invalid. When attempting to recompile the package we receive ORA-00904 errors even though running the statement through SQL Plus works fine. We've tried dropping the database link and re-creating it, but the package still will not recompile. The only way to correct the issue is to shutdown and restart the database. The db links in question are from a 10G Release 2 database to a 8.1.7.4 database. Any insight would be helpful.

We often had similar issues over dblinks between two 8.1.7.2 databases. The result was ORA 600 errors which could only be corrected by shutdown/re-start. Our DBAs eventually came up with flushing the shared pool, instead of the shutdown/re-start.
ALTER SYSTEM FLUSH SHARED_POOL;

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Message was edited by:
Megastar_Chiru

- Oracle Integration Repository, Search for 'Interface Type: PL/SQL'
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http://download.oracle.com/docs/cd/B28359_01/server.111/b28310/general007.htm#
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{quote}
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{quote}
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www.e-ammar.com/Oracle.htm

PL/SQL packages containing DB Links suddenly becomes invalid

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