To: Richard Estes who wrote (4086 ) 5/2/1998 11:25:00 PM From: Gary Lyben Respond to of 11149
Here's a discussion of how the QP2(tm) Virtual files differ from traditional Metastock(R) compatible files. Traditional Metastock(R) Compatible Files on your hard drive. C:\META MASTER F1.DAT The directory contains 1 .DAT file per symbol F2.DAT It can be about 40K for 4 years of data F3.DAT etc. F1.DOP You may have a corresponding .DOP file for each symbol F2.DOP It can take an additional 16 to 32 K per symbol F3.DOP etc. When a read request comes in from an application, the request goes to the WIndows files system, which reads the data off of your hard drive, and returns the data to the calling application. All of the data has to be on your hard drive. Read ---> Windows File System ---> HARD DRIVE <------------------------------------ QP2 Virtual Metastock(R) compatible files. C:\META MASTER F1.DAT There is 1 .DAT directory entry for each symbol in the directory. F2.DAT It consumes NO space for the data F3.DAT etc. FX.DOP There is 1 .DOP file for all symbols in the directory. It takes 16 to 32 K for ALL symbols in the directory. For the QP virtual files, when an application sends a read for the data, the QP device driver sends the request to the Quotes Plus dll, where the data is read from either your hard drive or CD ROM drive and then returned to the calling application. Read ---> Windows File System ---> QP2 DLL -----> HARD DRIVE or CD ROM <------------------------------------------------------------ What benefits does this have for the QP2 user? QP2's virtual Metastock compatible files can be read by any application that can read traditional Metastock compatible files. They take very little disk space, and can be quickly built in the scan program or in the QP2 virtual profile program. The data is always as current as the QP2 database data, no separate files have to be maintained, no conversion is necessary to keep the data in a format that can be read by your trading applications. The QP2 database updates all of the data for the entire market in just a few minutes every evening.After it's updated, the data is available to be scanned by the QP2 scan program, or by your other trading software.