FMIS 3202 Enterprise System Architectures Nik R. Hassan Spring 2007 Introduction to Enterprise Systems Architectures: Adaptable Systems Business Challenges
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Definition: The ability for a system to operate at the unit per unit capacity within the requirements of the customer.
Ebay before 1998 was operating on totally free software (including CGI/Perl for business code/form processing, FreeBSD for the operating system, Apache for the Web Server, GNU dbm-a database free from MIT). It maxed out at 50,000 items.
After 1998 it migrated to Oracle for database, Microsoft IIS for Web server, and combination of Solaris and NT for operating systems on different servers.
By 1999, the database servers could not grow any bigger
Had to rewrite all the code so that they can scale each tier