Database replication

A computer program product, suitably embodied in a non-transitory machine-readable medium and including instructions executable by a processor for detecting data loss in a replicated database, the instructions configured to cause the processor to perform operations comprising:

• receiving, at a database server, a request from a client application for performing a data transaction on persistent data storage;
• sending the request to a set of replication servers;
• receiving, from each replication server, an acknowledgement for the request, including a start sequence number and an end sequence number for data associated with the client application that is stored in local cache of the replication server, and a latest committed sequence number for data associated with the client application that was written to the persistent data storage by the replication server;
• determining a maximum value of latest committed sequence numbers received from the set of replication servers;
• examining, for each replication server, whether there is a gap between the start sequence number for data stored in local cache of the replication server and the maximum value of the latest committed sequence numbers;
• and
• based on the examining, determining whether there is an occurrence of loss of data associated with the client application.