DB Links

Does anyone happen to have a reasonable explaination on what happens to a query when you try to access tables accross db_links ?? Does it still use the indexes on the remote machine ?? Does it bring all the data locally into temp tables ??

Any info will do. Book names .... Actual explainations ... directions to web sites ... Anything.

We have a procedure, a fairly complex procedure, that takes about 13 hours to run when it is ran against tables that exist accross a DB link. But, when we copy all the tables locally, it runs in about an hour. We would like to try and find a way to fix this. But first, I need to know exactly what is happening when the cursor access those linked tables.

Any help would be appreciated.

Kevin

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