Performance using db_link

I have a schema which will be migrating to a new data model and even to a new instance on a different operating system. Because we have many legacy applications accessing this schema, we still need to support the old table objects.

Right now I have 2 options on the table:

1 - create a public synonym, "old_schema.table", in the old instance which points to: new_schema.view_at_db_link_to_new_instance

OR

2 - create a view in the old instance which is:

                select * from new_schema.view_at_db_link_to_new_instance

If I do a simple select of 1 column using both options, it takes more than 5 minutes to retrieve the 1 record. The views in the new schema are very complex and I believe that is where I should focus my tuning. Which option listed above is "standard" ?

TIA,
Cliff

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