The image shows a sharded database, represented by a Coordinator Database icon and three shard databases below it labeled from left to right, Shard DB1, Shard DB2, and Shard DB3. An icon representing an Application appears to the left of the Coordinator Database, and an arrow labeled "Q" points from Application to Coordinator Database.

The Coordinator Database has one arrow labeled "R" which points to the Application, and three arrows labeled "SQ"each of which point to a shard: Shard DB1, Shard DB2, and Shard DB3.

Shard DB1 has an arrow labeled "r1" which points to the Coordinator Database.

Shard DB2 has an arrow labeled "r2" which points to the Coordinator Database.

Shard DB3 has an arrow labeled "r3" which points to the Coordinator Database.