December 2017
Intermediate to advanced
434 pages
10h 14m
English
Content preview from SQL Server 2017 Administrator's Guide
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Clustered B-tree index
The clustered B-tree index seems to be very similar to non-clustered indexes, but there's one big difference. The index key is not copied to its separate storage but the table itself forms the leaf-level of the index. It's obvious that only one clustered index can be created by a table. When a clustered index is created, records in the table are sorted accordingly with the index definition and data pages are ordered in a double-linked list.
When SQL Server performs read on a clustered index, it could use these operations:
- Clustered index scan: This is executed when the SELECT statement is issued. The entire table is retrieved.
- Clustered index seek: The WHERE condition of the query contains a predicate for the clustered ...
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