tailieunhanh - The Power of Firebird Events 2005

ne of the difficulties of maintaining a large network of battery-powered, wire- less nodes is that failures are frequent. Sometimes these failures are fail-fast: for example, a node’s battery dies and it stops reporting readings. At other times, however, these failures are more insidious: a node’s readings slowly drift away from those of sensors around it, until they are mean- ingless or useless. Of course, there are times when such de-correlated readings actually represent an interesting, highly localized event (., an outlier). In either case, however, the user will typically want to be informed. | Firebird Conference Prague 2005 The Power of F irebird Events Milan Babuskov http About the author Education 2001 - . In Business Information System Engineering 2003 - . In Internet Technology at University of Belgrade Started to program as a 14 year old making simple games in BASIC and later assembler on Motorola s 680x0 series CPUs. Programmed in C Perl and Java. Now writing the code in C and PHP. Started to work with Informix at University after few experiments with Paradox MySQL and MSSQL finally switched to Firebird. Starting from 2002 developing various software using Firebird PHP and Apache. Developer of open source FBExport and FBCopy tools for manipulation of data in Firebird databases. In 2003 started a project to build a lightweight cross-platform graphical administration tool for Firebird. The project was later named FlameRobin and is built entirely with open source tools and libraries. Hobbies include playing basketball and writing cross-platform computer games some of them very popular Njam has over 36000 downloads on http http http Born in 1977. Still single. Live and work in Subotica Serbia. Currently employed at large ISP company. About Events Events are one of Firebird s least known features. One of the reasons for that is probably the fact that events aren t available in other database management systems so users aren t aware that such functionality exists. Therefore their mind is not set to think in that direction. What are events Events are simple notification messages sent asynchronously from server to clients. It means that they are not a part of standard request-reply mechanism used for database queries. Whenever the event happens in database the server alerts all the clients which declared their interest in that event. Events are simple notifications they don t carry any additional data beside the event name itself. They do carry a count - in .