Performance Tuning Archives

Category: Performance Tuning

June 4, 2013

High CPU usage on DB host?

Its Unix 101 statement, but I have heard it wrong so many time, so decided to put a blog for it. If in OLTP environment, per ‘top’ %wa (IOWAIT) is major contributor for CPU busy, adding CPU would not help. There is no need for more CPU. Period. ************** %wa IS PERCENTAGE WHAT COUNT TO […]

Oracle

Performance Tuning

June 3, 2012

Index Clustering factor. One way how to avoid negative performance impact on joins which involves bad clustered indexes.

High Index Clustering factor is popular problem in SQL world.The most known solution for it – rebuild table ordering by columns what are in the index.But in real world, with table size growing exponentially its not always practical or possible to do it. Here is one way to avoid index clustering problem by SQL optimization.. […]

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Category: Performance Tuning

High CPU usage on DB host?

Index Clustering factor. One way how to avoid negative performance impact on joins which involves bad clustered indexes.

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Category: Performance Tuning

High CPU usage on DB host?

Index Clustering factor. One way how to avoid negative performance impact on joins which involves bad clustered indexes.

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