Spatial query in a Distributed Database

Question

Y have 2 oracle dbs: db1 in machine 1 and db2 in machine 2.
In machine 1 i have the tables and the index tables and in machine 2 i want make the spatial queries in these tables on machine 1. I make the grants to tables in machine 2. But when i execute the select, oracle returns:ORA-13226 interface not supported without a spatial index. But i created the indexes in machine 1. HElp-me, please!!!!
Sory my english.

Answer 1

In the real world, you wouldn't design a system where you maintained referential integrity between two databases owned by two different companies. You wouldn't want two organizations to have systems that were that tightly coupled. You might replicate reference data from one database to the local database and then declare integrity constraints between the replicated reference table and other tables in the system, but even that may be more tightly coupled than you'd normally want. The owner of the parent table, for example, would want to be able to delete records from the master after some retention period without worrying that some downstream database still had child records that referred to the parent. The owners of the parent table might also have lots of different downstream consumers and wouldn't want to have to write new code every time a new consumer came along.
If you want to ignore multi-user issues, you could write relatively simplistic triggers. When you insert or update data into the child table, do a select against the parent table and throw an exception if no rows are found. When you delete data from the parent table, do a select against the child table and throw an exception if rows are found. If you want to handle the case of updating a primary key, you could do that as well. These triggers, though, would not work if there are multiple users modifying the tables simultaneously-- someone may have deleted a parent record in another session that isn't committed, for example, when your child table trigger reads the data.
Justin