53. The computer-executable instructions of claim 47 , wherein observations on the database messages based at least in part on the query-language statements extracted at the decoding layer comprise times to complete responses to queries from clients.
53. The computer-executable instructions of claim 47 , wherein observations on the database messages based at least in part on the query-language statements extracted at the decoding layer comprise times to complete responses to queries from clients. 54. The computer-executable instructions of claim 53 , wherein an observation comprising a time to complete a response to a query from a client indicates a first portion of the time to complete the response attributable to the client and a second portion of the time to complete the response attributable to a database sewer.