The question comes up when looking at an execution plan of whats the difference between an index seek and an index scan. What it really comes down to is speed, for tables with a large number of rows, and thus indexes with a large number of rows, an index seek may take significantly less time than an index scan. …
Default Values and Computed Columns In SQL Server 2008, I was presented with the following error when attempting to create a table that has a default value that references other columns in the same table. Msg 128, Level 15, State 1, Line 6 The name “Subtotal” is not permitted in this context. Valid expressions are constants, constant expressions, and (in …
MSG 128, Level 15, State 1 – not permitted in this context Read more »
Just the same query that I posted months ago, but this time it is wrapped in a stored proc. I use this one often enough that it is easier to just call the stored proc. Download the FindOneTimeUseQueries source code. TSQL example: CREATE PROCEDURE [dbo].[Findonetimeusequeries] AS BEGIN SET nocount ON; SELECT TOP 100 refcounts, usecounts, size_in_bytes /1024 AS sizeinkb, TEXT FROM sys.dm_exec_cached_plans CROSS APPLY sys.Dm_exec_sql_text(plan_handle) WHERE cacheobjtype = ‘Compiled Plan’ AND objtype = ‘Adhoc’ AND usecounts = 1 AND TEXT NOT LIKE ‘FETCH API_CURSOR%’ ORDER BY size_in_bytes DESC END This posting …
There is a newer version of this posting, click here. Part of my regular database maintenance or tuning routine is to look for the queries with cached plans that are taking up the most space, and have only been used once. The query below is a handy query to track down the queries that may be in need of paramaterization. …
Attached is the slide deck for a short presentation on indexing that was created to educate software developers on the basics of indexing. Outline: What is an Index Types of Indexes Non Clustered Indexes Clustered Indexes When To Avoid A Clustered Index Covered Indexes Index Usage Terminology Summary Additional Topics Download Indexing_Overview.pdf Here is the text outline of the presentation. …
There was no change to the compatibility levels between SQL Server 2008 and SQL Server 2008 R2. SQL Server can run in a number of different compatibility levels, but how do you change it and how do you set it. These compatibility levels reflect the version of SQL server. 60 = SQL Server 6.0 65 = SQL Server 6.5 70 …
Originated as Sybase SQL Server Acquired by Microsoft and named Microsoft SQL Server in 1989 Recent Versions (2005, 2008, and 2008 R2) But what is it? A system for managing large amounts of data Provides a language TransactSQL (T-SQL) to access and manipulate data A multi-user server based application A relational database
Here are the slide decks from the Introduction to SQL Server class – January 2010. Class 1 About the Instructor Introduction and Class Overview (Review Syllabus) Course Logistics – What to expect and what is expected What is SQL Server? Installing SQL Server 2008 SQL Server Management Studio Differences between SQL Server 2005 and SQL 2008 Introduction to SQL Books …
Notes from the Introduction to SQL server class. Read more »
The current datacenter has failed. The company that we have been using Fibercloud in Bellinhgam WA, with their “Always On” slogan has had an epic failure. Server temp of 117 degrees F means that it is time to move to a real datacenter. Planning on configuring a new SQL server a the new location, then doing a full restore and …
Moving to a new datacenter – EPIC FAIL – Fibercloud. Read more »
If you are using Windows 7, give this a try. When you have multiple windows all visible on your desktop, just click on the title bar of one of the windows. While holding your mouse button down “Shake” that window my moving your mouse back and forth quickly. All other windows on the desktop will be minimized, leaving the window …