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Ramesh Meyyappan’s SQL Server Performance Tuning Blog

Ramesh Meyyappan (www.sqlworkshops.com) is a SQL Server specialist with expertise in Performance Tuning. Ramesh worked at Microsoft Corporation from 1994 to 2004. Nearly half of that time he worked in Redmond in the development teams - specifically as Program Manager in the SQL Server Development Team responsible for optimizing SQL Server product for SAP. Ramesh now offers onsite and offsite consulting and workshops independently as well as by partnering with various Microsoft Subsidiaries. LinkedIn Profile: http://de.linkedin.com/in/rmeyyappan.

Archives: January 2012

Prefetch – Querying at the speed of SAN

Prefetch is a mechanism with which SQL Server can fire up many I/O requests in parallel for Nested Loop join.

The SAN administrator says your data volume has a throughput capacity of 400MB/sec. But your long running query is waiting for I/Os (PAGEIOLATCH_SH) and Windows Performance Monitor shows your data… Read more