Indexes. They're one of the most powerful and misunderstood aspects of SQL performance. In this post we'll look at the purpose of an index, how to create and choose choose your index type. Then finish with a discussion of how to decide what to index and
How to: Create Indexes 项目 2014/12/03 You can use an index to speed access to data in a database table. You create an index by selecting one or more columns in a table that you want to be able to search on. You can use the index as soon as you save the table. 备注 A new...
To create full-text indexes InServer Explorer, right-click the table for which you want to create a full-text index, and clickOpen Table Definition. The table opens inTable Designer. On theTable Designermenu, clickFulltext Index. TheFull-text Indexdialog box opens. ...
So, now that we gained some basic knowledge and a general idea of what indexes do let’s see a few SQL Server index optimization real-world examples using SQL Server Management Studio (SSMS) to create an index and most importantly take a closer look at some performance benefits of indexes....
You can create indexes in structural compound index (.cdx) files using the Visual FoxPro language. You can create an index when you create a table using the SQL CREATE TABLE command or create an index for an existing table using the SQL ALTER TABLE command or the INDEX command. 备注 If ...
Step 4. Defragment Indexes Additional Resources Applies To Microsoft® SQL Server™ 2000 Overview This How To helps you to optimize your queries by indexing your tables correctly. The purpose of an index in SQL Server is to allow the server to retrieve requested data, in as few I/O oper...
“Index Set 1” is tested with a significant improvement and improves the first execution time from 9.51 seconds to 0.65 seconds. It is a 14 times improvement that can make my database run more efficiently. So, you should be very careful to tune your SQL with new indexes that may not ...
Step 4. Defragment Indexes Additional Resources Applies To Microsoft® SQL Server™ 2000 Overview This How To helps you to optimize your queries by indexing your tables correctly. The purpose of an index in SQL Server is to allow the server to retrieve requested data, in as few I/O oper...
Expand the table for which you want to create the index. Right clickIndexesand selectNew Index. In theIndex namefield, enter a name for the index. In theIndex typedropdown list, selectSpatial. To specify the spatial column that you want to index, clickAdd. ...
Ensuring that queries are performant or that they fit the context that you’re working in is a whole other thing. That’s why this SQL tutorial will provide you with a small peek at some steps that you can go through to evaluate your query: First off, you’ll start with a short ...