Patent ID: 11914590
Assignee: AMAZON TECHNOLOGIES, INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 16:
17. One or more non-transitory computer-accessible storage media storing program instructions that when executed on or across one or more processors of a request router of a database system, cause the request router to:
forward queries to a plurality of database servers of the database system, wherein the database servers are individually configured to store replicas of a database and cache data in a cache to service queries directed to the database;
obtain caching state metadata from the database servers, wherein the caching state metadata indicates data objects cached by individual ones of the database servers
update a server lookup table that maps different types of queries to different ones of the database servers based at least in part on the data objects cached by the database servers;
receive a query directed to the database;
select a database server from the plurality of database servers to forward the query using the server lookup table; and
forward the query to the database server selected.