Index Internal Structure in SQL Server: Stairway to SQL Server Indexes Level 10
A detailed look the B-Tree structure – Leaf level and non-leaf level.
2012-01-20
17,135 reads
David Durant
Reading Query Plans: Stairway to SQL Server Indexes Level 9
Determining how, and if, SQL Server is using your indexes.
2011-10-05
15,835 reads
Unique Indexes in SQL Server: Stairway to SQL Server Indexes Level 8
Indexes that ensure data integrity in addition to locating rows.
2011-09-14
13,432 reads
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.
2011-08-24
15,282 reads
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.
2011-08-03
15,820 reads
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Question of the Day
How Long is a Long I/O?
In SQL Server 2025, a long I/O is recorded in the error log with message 833. How long much an I/O request be outstanding before this message is written to the log?
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