David Durant


Stairway to SQL Server Indexes

Filtered Indexes in SQL Server: Stairway to SQL Server Indexes Level 7

A filtered index eliminates unusable entries from the index, producing an index that is as beneficial as, but much smaller than, an unfiltered index. If a certain subset of a table's data is frequently requested, a filtered index can also be a covering index; resulting in a considerable reduction in IO.

You rated this post out of 5. Change rating

2011-08-24

15,245 reads

Stairway to SQL Server Indexes

Bookmarks in SQL Server Indexes: Stairway to SQL Server Indexes Level 6

A nonclustered index entry consists of search key columns, included columns, and the bookmark. The bookmark value will be either a RID or the clustered index's key, depending upon whether the table is a heap or a clustered index. Choosing the best clustered index for a table requires that you follow three guidelines to ensure that the index key will make a good bookmark.

3 (1)

You rated this post out of 5. Change rating

2011-08-03

15,773 reads

Blogs

“SQL Server Is Slow” Part 4 of 4

By

Parts 1, 2 and 3 got you to the (SQL) engine room. Now we...

How to Install DBeaver and Connect to a PostgreSQL Instance

By

Whether you’re a seasoned DBA or just exploring database tools, DBeaver offers a powerful,...

DBAs should never run SSMS under their everyday Windows account

By

 DBAs should never run SSMS under their everyday Windows account If you open SSMS under...

Read the latest Blogs

Forums

Extract from sql.to multiple sheets

By Sqladmin1

Import-Module ImportExcel # Path to your .sql file $sqlFile = "C:\Data\MyQueries.sql" $excelPath = "C:\Data\SqlExtract_$(Get-Date...

sp_prepare and sp_execute vs sp_executesql

By rajemessage 14195

I have noticed sp_executesql also makes a single plan for a stmt with parameter...

Who am I?

By Steve Jones - SSC Editor

Comments posted to this topic are about the item Who am I?

Visit the forum

Question of the Day

Who am I?

If I want to track which login called a stored procedure and use the value in an audit, what function can I use to replace the xxx below?

create procedure AddNewCustomer
  @customername varchar(200)
AS
BEGIN
    DECLARE @added VARCHAR(100)
    SELECT @added = xxx

    IF @customername IS NOT NULL
      INSERT dbo.Customer
      (
          CustomerName,
          AddedBy 
      )
      VALUES
      (@customername, @added)
END

See possible answers