
indexing - What is an index in SQL? - Stack Overflow
Jun 2, 2010 · An index is used to speed up the performance of queries. It does this by reducing the number of database data pages that have to be visited/scanned. In SQL Server, a …
sql - How to use index in select statement? - Stack Overflow
Jul 6, 2011 · The index hint is only available for Microsoft Dynamics database servers. For traditional SQL Server, the filters you define in your 'Where' clause should persuade the …
sql server - Script for rebuilding and reindexing the fragmented …
Can anyone provide the script for rebuilding and re-indexing the fragmented index when 'avg_fragmentation_in_percent' exceeds certain limits (better if cursor is not used)?
SQL Server Plans : difference between Index Scan / Index Seek
Feb 27, 2012 · In a SQL Server Execution plan what is the difference between an Index Scan and an Index Seek I'm on SQL Server 2005.
sql server - IndexOf function in T-SQL - Stack Overflow
Given an email address column, I need to find the position of the @ sign for substringing. What is the indexof function, for strings in T-SQL? Looking for something that returns the position of a
sql - Query to check index on a table - Stack Overflow
Jan 19, 2017 · I need a query to see if a table already has any indexes on it.
How can I quickly detect and resolve SQL Server Index …
Apr 28, 2017 · Here is a SQL query solution that works in SQL Server 2005 and up, that will let you 1) first find all the indexes that need to be rebuilt or reorganized to reduce fragmentation, …
What are Covering Indexes and Covered Queries in SQL Server?
So, the query is called a covering query and the index is a covering index. A clustered index can always cover a query, if the columns in the select list are from the same table. The following …
sql - How to decide when use index on table column - Stack …
Aug 16, 2012 · A index will help only select queries and at the same time it will slightly decrease performance of inserts, deletes and updates, because besides altering the row on the table, …
How often should the indexes be rebuilt in our SQL Server database?
Currently our database has size 10 GB and is growing by around 3 GB per month. Often I hear that one should from time to time rebuild the indexes, to improve the query execution time. So …