In Oracle (8i), is it possible to enforce foreign key constraints across schemas (within the same database instance)?...
Yes, it is possible to have the database enforce a Foreign Key constraint across schemas in the same database instance. To do this, you will need to grant the REFERENCES object privilege to the other schema which will have a foreign key to your schema's table. Something like the following should do the trick:
GRANT references ON my_table TO your_user;
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