SQL Development Archives - Page 3 of 5

Oct 26

Rx for Demystifying Index Tuning Decisions – Part 1

By Jeffry Schwartz | Expert , Missing Indexes , Performance Tuning , Query Tuning , SQL Administration , SQL Development , SQL Server

Overview Indices are one of the most troubling and mysterious areas for DBAs and developers. Most understand that adding a badly needed index can yield dramatic query performance improvements, but how does one know what is needed? Many believe more indices are better, regardless of the number. Most fear deleting ANY existing indices, even when […]

Sep 28

Get Index Column Info with Includes for One or Many Tables

By Lori Brown | Helpful Scripts , Missing Indexes , Performance Tuning , Query Tuning , SQL Administration , SQL Development , SQL Server

I was recently working with one of my clients on some low hanging fruit type of query tuning. We had checked the cache for plans with missing index warnings in them and were trying to see if we could tweak and existing index or add a new index to speed things up. If you ever […]

Aug 10

How Indexing Affects Deletion Queries

By Jeffry Schwartz | Performance Tuning , SQL Development , SQL Server

The Problem Many articles concerning SQL Server discuss how record insertion overhead increases with each additional index. They discuss b-tree manipulations and page splits in addition to leaf and non-leaf levels. However, few discuss the fact that deletion overhead increases as well, especially when large numbers of records are deleted by individual queries. Recently, I […]

Jul 20

Handling Multiple Missing Index Recommendations for the Same Table

By Jeffry Schwartz | Expert , Missing Indexes , Performance Tuning , Query Tuning , SQL Development , SQL Server

The Problem Many articles concerning SQL Server missing index recommendations demonstrate the mechanics for obtaining them and often highlight whether the suggested key columns are used in equality or inequality relationships. Most of these examples emphasize a single index that can be implemented to improve performance. However, real-life situations often involve multiple or many suggested […]

Jun 02

Query Tuning and Missing Index Recommendations

By Jeffry Schwartz | Missing Indexes , Performance Tuning , Query Tuning , SQL Development , SQL Server

Overview Most analysts are familiar with missing index recommendations provided by SQL Server when query plans are displayed within SSMS or reported by various missing index DMVs. Several questions arise concerning these recommendations: What determines whether a column becomes a key or included in the new index? Where does the ordering of the included columns […]

Mar 23

Query Tuning – Adding Included Columns To An Existing Index

By Lori Brown | Intermediate , Performance Tuning , SQL Administration , SQL Development , SQL Server

— by Lori Brown @SQLSupahStah For the most part, I stick to my daily DBA duties of making sure that SQL Server maintenance is running and that the proverbial lights are on in all my SQL boxes. However, sometimes it is fun to do some tuning and it’s even better when you have a success. I […]

Jan 26

SSISDB – Package Execution Time in Minutes and Average Execution Time

By Lori Brown | Expert , SQL 2016 , SQL Development , SQL Server , SSIS Catalog

–By Lori Brown @SQLSupahStah I have a client who has a lot of SSIS packages in the SSIS catalog that we are migrating to a new server. Of course there is lots of testing going on. So the question came up about how to more easily see package runtimes and comparing to the overall average […]

Jan 12

SQL 2016 SP1 USE HINT

By Lori Brown | Intermediate , Performance Tuning , SQL Development , SQL Server , Trace Flags

–By Lori Brown @SQLSupahStah After installing Service Pack 1 for SQL 2016, I ran across USE HINT and thought I would put out what I could find to document it. Here’s where you find info from Microsoft: https://msdn.microsoft.com/en-us/library/ms181714.aspx and here is a link for all of the bugs that are fixed in SP1: https://support.microsoft.com/en-us/kb/3182545 USE […]

Sep 01

Table-Valued Parameter Performance Using C# Data Tables

By Jeffry Schwartz | Expert , Miscellaneous , Performance Tuning , SQL Development , SQL Server

The following testing and resulting data is a direct result of a recent issue that was discovered at one of our client sites. After setting up SQL monitoring that does use a SQL trace to capture long running queries, suddenly certain processes would lock up and be unable to complete. Initially we thought it was […]

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