Re: Pulling from Multiple Databases

(comments in-line) On Tue, Feb 1, 2011 at 10:34 AM, Richard Quadling <rquadling@gmail.com>wrote: > I use a data warehouse (a semi denormalized db) to hold data from > around 200 different data sources (DB, Excel spreadsheets, Web, etc.) > > I use multiple scripts to update the DB, each one tuned to a > particular frequency. > > A different script for each database is a possibility. It's a little extra load on the app server, but it should be able to handle it. Maybe with pcntl_fork? I haven't explored this option much. > My main app's queries are always against the data warehouse. > > That way, the live front end isn't worried about getting the source data. > > If the data is needed live, then I'd be looking to see if I can get a > live data feed from the source system. Essentially a push of the data > to my data warehouse - or a staging structure to allow locally defined > triggers to clean/process the data upon arrival. > > Automation is the key for me here. Rather than trying to do everything > for the request, respond to the changes in the data or live with the > fact that the data may be stale. > > Can you give us any clues as to the sort of app you are building? The > sort of data you are working on? Are you running your own servers? > Data are needed live. 3 of the databases are MySQL. 14 are XML files that change frequently. 3 are JSON. 1 is Microsoft SQL Server 2005. The main app is running on linux (distribution doesn't matter - currently Debian, but I can change it to whatever if there's a reason). Most is financial data that needs ordered. I'm going to explore the pcntl_fork option some more... Thanks! Jon