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some helpful stuff for identifying which need optimization in sql server

Sreenivas Mogullapalli — Wed, 08 Jul 2009 01:11:31 GMT

-- Query to identify the missing indexes in t-sql of sql server

-- from the dynamic views

BEGIN

-- Do not lock anything, and do not get held up by any locks.

SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED

SELECT TOP 20

st.text AS [SQL]

, cp.cacheobjtype

, cp.objtype

, DB_NAME(st.dbid)AS [DatabaseName]

, cp.usecounts AS [Plan usage]

, qp.query_plan

FROM sys.dm_exec_cached_plans cp

CROSS APPLY sys.dm_exec_sql_text(cp.plan_handle) st

CROSS APPLY sys.dm_exec_query_plan(cp.plan_handle) qp

WHERE CAST(qp.query_plan AS NVARCHAR(MAX))LIKE '%<MissingIndexes>%'

ORDER BY cp.usecounts DESC

END

-- some variations of the same to find some other patterns which need optimization.

1. exec dbo.dba_SearchCachedPlans '%<MissingIndexes>%'
2. exec dbo.dba_SearchCachedPlans '%<ColumnsWithNoStatistics>%'
3. exec dbo.dba_SearchCachedPlans '%<TableScan%'
4. exec dbo.dba_SearchCachedPlans '%CREATE PROC%MessageWrite%'

-- to find Top 20 Expensive Queries in sql server

SELECT TOP 20 SUBSTRING(qt.text, (qs.statement_start_offset/2)+1,

((CASE qs.statement_end_offset

WHEN -1 THEN DATALENGTH(qt.text)

ELSE qs.statement_end_offset

END - qs.statement_start_offset)/2)+1),

qs.execution_count,

qs.total_logical_reads, qs.last_logical_reads,

qs.min_logical_reads, qs.max_logical_reads,

qs.total_elapsed_time, qs.last_elapsed_time,

qs.min_elapsed_time, qs.max_elapsed_time,

qs.last_execution_time,

qp.query_plan

FROM sys.dm_exec_query_stats qs

CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) qt

CROSS APPLY sys.dm_exec_query_plan(qs.plan_handle) qp

WHERE qt.encrypted=0

ORDER BY qs.total_logical_reads DESC

-- to find Who did What When in sql server?

select sys.dm_exec_sessions.session_id,sys.dm_exec_sessions.host_name,sys.dm_exec_sessions.program_name,

sys.dm_exec_sessions.client_interface_name,sys.dm_exec_sessions.login_name,

sys.dm_exec_sessions.nt_domain,sys.dm_exec_sessions.nt_user_name,

sys.dm_exec_connections.client_net_address,

sys.dm_exec_connections.local_net_address,sys.dm_exec_connections.connection_id,sys.dm_exec_connections.parent_connection_id,

sys.dm_exec_connections.most_recent_sql_handle,

(select text from master.sys.dm_exec_sql_text(sys.dm_exec_connections.most_recent_sql_handle )) as sqlscript,

(select db_name(dbid) from master.sys.dm_exec_sql_text(sys.dm_exec_connections.most_recent_sql_handle )) as databasename,

(select object_id(objectid) from master.sys.dm_exec_sql_text(sys.dm_exec_connections.most_recent_sql_handle )) as objectname

from sys.dm_exec_sessions inner join sys.dm_exec_connections

on sys.dm_exec_connections.session_id=sys.dm_exec_sessions.session_id

these, i found on some other sites and posting here for my reference so that i don't miss them

An Introduction to JavaScript Object Notation (JSON) in JavaScript and .NET

Sreenivas Mogullapalli — Fri, 06 Apr 2007 06:29:00 GMT

A good article on JSON in MSDN site http://msdn2.microsoft.com/en-us/library/bb299886.aspx

VB.Net/C# Coding Guidelines

Sreenivas Mogullapalli — Wed, 20 Dec 2006 10:05:00 GMT

submain.com is offering free download of their VB.Net / C# coding guidelines, a 100+ page ebook.

More info at http://submain.com/blog/FreeCVBNETCodingGuidelinesEbookDownload.aspx

eBook: C# School Ebook

Sreenivas Mogullapalli — Tue, 12 Dec 2006 08:53:00 GMT

This is available on www.programmersheaven.com site. This book is free and available online.

Chapters

Introduction
C# Language Fundamentals
Classes and Objects
Inheritance & Polymorphism
Structures, Enumeration, Garbage Collection & Nested Classes
Abstract Classes & Interfaces
Arrays, Collections & String Manipulation
Exception Handling
Delegates & Events
WinForms & Windows Applications
More Windows Controls & Standard Dialog Boxes
Data Access using ADO.Net
Multithreading
The File System & Streams
New Features In C# 2.0

URL : http://www.programmersheaven.com/2/csharpbook

Direct links to book

Download C# ebook (.pdf 3.6Mb)
Download C# ebook (Mirror 1) (.pdf 3.6Mb)

eBook: .NET Book Zero

Sreenivas Mogullapalli — Tue, 12 Dec 2006 08:48:00 GMT

.NET Book Zero: What the C or C++ Programmer Needs to Know about C# and the .NET Framework

This is available at Charles Petzold web site. You can download it here.

Rules to better software ....

Sreenivas Mogullapalli — Fri, 28 Jul 2006 11:09:00 GMT

ScottGu pointed this in his blog and i found this nice. You can read all here. I wanted to log here in my blog so that i will never forget the url. :)

C# & VB.Net Syntax Comparison

Sreeni M — Thu, 15 Jun 2006 02:10:00 GMT

A nice compilation of syntax comparison of two languages (C# and VB.NET) is provided at http://www.harding.edu/USER/fmccown/WWW/vbnet_csharp_comparison.html. (Information via dotnetjunkies blog)