NASDAQ, which became the world’s first electronic stock market in 1971, and remains the largest U.S. electronic stock market, is constantly looking for more-efficient ways to serve its members. As the organization prepared to retire its aging Tandem mainframes, it deployed Microsoft® SQL Server™ 2005 on two 4-node Dell PowerEdge 6850 clusters to support its Market Data Dissemination System (MDDS). Every trade that is processed in the NASDAQ marketplace goes through the MDDS system, with SQL Server 2005 handling some 5,000 transactions per second at market open. SQL Server 2005 simultaneously handles about 100,000 queries a day, using SQL Server 2005 Snapshot Isolation to support real-time queries against the data without slowing the database. NASDAQ is enjoying a lower total cost of ownership compared to the Tandem Enscribe system that the SQL Server 2005 deployment has replaced.
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