If your database is distributed across a few servers, and you need to access the database across these servers, one way to improve performance is through the use of database links.
Here is a PL/SQL program that inserts records into a number of tables on one server from multiple different servers. Without using database links, this took hours to run the job -- now it only takes less than 5 minutes!
insert into table_a select * from remote_site1_table_a@db_link_site1.world; insert into table_b select * from remote_site1_table_b@db_link_site1.world; insert into table_a select * from remote_site2_table_a@db_link_site2.world; insert into table_b select * from remote_site2_table_b@db_link_site2.world;
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This was first published in October 2001