Archive for August, 2011

Screencast sobre SQL Server Denali Developer Tools Juneau

August 20, 2011

Les comparto este screencast en cual vemos una instroducción a las herramientas de desarrollo en SQL Server Denali





Ing. Eduardo Castro Martínez, PhD – Microsoft SQL Server MVP

Costa Rica

Technorati Tags: SQL Server

LiveJournal Tags: SQL Server Tags: SQL Server


Wait Stats in SQL Server

August 13, 2011

When you are optimizing a SQL Server installation you must look at the Wait Stats in SQL Server and the easier way to check them is using the following DMVs  sys.dm_os_waiting_tasks, sys.dm_exec_requests and sys.dm_os_wait_stats.

The sys.dm_os_wait_stats contains aggregated information about wait statistics for SQL Server, you must be aware that these wait statistics are aggregated at the server level, and there is no detail level available in this DMV. The following scripts queries this DMV.

FROM sys.dm_os_wait_stats
ORDER BY wait_time_ms DESC


The previous query returns the all waits with an accumulated wait time expressed in milliseconds. Because these wait stats are cumulative since the SQL Server service started to run, one way to clear these counters is to execute the DBCC SQLPERF(“sys.dm_os_wait_stats”,CLEAR) and from this point SQL Server begins to accumulate the wait stats again.

Best Regards,

Eduardo Castro

Microsoft SQL Server MVP

Video de Overview de SQL Server Denali

August 9, 2011

Les comparto este video de introducción  a las principales características de SQL Server Denali





Ing. Eduardo Castro Martínez

Screencast Introducción al desarrollo con SQL Azure y Windows Azure

August 7, 2011

Les comparto este screencast en el cual vemos el desarrollo de bases de datos en la nube con SQL Azure





Ing. Eduardo Castro Martinez