Oracle 19c Database Links: A Complete, Step-by-Step Implementation Guide
Configure, secure, and validate Public and Private Database Links between two independent Oracle 19c databases — with full SQL transcripts, real-world banking scenarios, and production hardening tips. 1. Introduction — What Is a Database Link? A Database Link (DB Link) in Oracle Database 19c is a schema object that establishes a one-way logical communication path from one Oracle database to another over the network. Once a DB Link is created, SQL statements running on the local database can transparently reference tables, views, and PL/SQL programs that physically reside on a remote database — as if they were local objects. In practical terms, a DB Link lets you: Execute remote SELECT , INSERT , UPDATE , and DELETE statements Call remote stored procedures and functions Participate in distributed transactions (two-phase commit) Build cross-database reports without ETL or replication Real enterprise environments rarely run on a single database. Different applications, departme...