Hardware that the application will run is ~1Ghz Atom CPU, ~1GB RAM, regular Laptop HDD (no SSD). Time to time, there will be calculations, Network file transfer, and DLL function calls (all three) will be simultaneously running. Application has Timers and Socket listening components on it. My concern is to have a situation which "seems" like an application freeze.
On the other hand, will it be any help to increase accuracy to use Currency (8 bytes fixed-point data type) in my application for Price and Total fields, leave Amount field as Double? Thanks. -----Original Message----- From: sqlite-users-boun...@mailinglists.sqlite.org [mailto:sqlite-users-boun...@mailinglists.sqlite.org] On Behalf Of Darren Duncan Sent: Wednesday, July 6, 2016 1:20 AM To: SQLite mailing list <sqlite-users@mailinglists.sqlite.org> Subject: Re: [sqlite] Currency & SQLite On 2016-07-05 3:02 PM, Ertan Küçükoğlu wrote: > I am using Delphi 10 for programming. Current variables are defined as Double > (8 bytes real), saved in Database using something > "DataSet.FieldByName('Amount').AsFloat := My_double_variable" However, I am > now considering to convert all Double datatypes to Single (4 bytes real) for > performance issues. Do NOT change to using Single, always use Double, end to end. First of all, Double is what SQLite uses internally for floats, per its documentation: "The value is a floating point value, stored as an 8-byte IEEE floating point number." So if you're already using Double in your app then staying that way should maintain accuracy, especially when you want accuracy for more than say 3-5 decimal digits in total. Secondly, for financial applications, accuracy trumps performance. Converting to Single at any time is just going to cause you trouble. And really, are you sure using Single would actually help performance? Have you measured it in a real workload? More likely on modern devices it won't be any faster and you will have lost your accuracy for nothing. -- Darren Duncan _______________________________________________ sqlite-users mailing list sqlite-users@mailinglists.sqlite.org http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users _______________________________________________ sqlite-users mailing list sqlite-users@mailinglists.sqlite.org http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users
