Friday, March 11, 2011

DB performance - focus on read or write?

1) Concurrent Write is the focus of DB performance tuning in some low-latency apps, esp. execution engines at the heart of ECNs and broker/dealer systems. Every execution must be permanently recorded (transactional) before sending out responses to counter-parties and downstream. DB read is avoided with caching.

1b) For market data engines, non-transactional DB write is still slower than flat file write. If a flat-file-write operation is A, then a database write operation involves A+B. If you don't need the DB features, then you don't need B. A is always faster than A+B.

2) Read is the focus of DB performance in other domains where data volume is huge -- search, reporting, ERP, back office, asset management, BI, Data warehouse,

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Those are the 2 domains I see more often. There are other contexts --

Write can be the bottleneck in high volume batch ETL. We used to rely on sybase bcp.

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http://www.linkedin.com/in/tanbin