This image shows a reference architecture diagram with a sharded database deployed across three cloud providers: Oracle Cloud, Microsoft Azure, and Amazon Web Services. An internet gateway allows traffic between each cloud provider and the public internet.

Each cloud provider has three layer. The first layer contains two shard directors, the second layer contains three primary Oracle shards and two catalogs, and the third layer contains three standby shards.

Oracle Cloud has shard directors: GSM1 and GSM2, the primary shards are Shard 1, Shard 2, and Shard 3. The standby shards are Shard 1, Shard 2, and Shard 3.

Microsoft Azure has shard directors: GSM3 and GSM4, the primary shards are Shard 4, Shard 5, and Shard 6. The standby shards are Shard 4, Shard 5, and Shard 6.

Amazon Web Services has shard directors: GSM5 and GSM6, the primary shards are Shard 7, Shard 8, and Shard 9. The standby shards are Shard 7, Shard 8, and Shard 9.