Download Pro SQL Server Internals by Dmitri Korotkevitch PDF
By Dmitri Korotkevitch
Professional SQL Server Internals explains how various SQL Server elements paintings "under the hood" and the way they impart with one another. this is often the sensible e-book with loads of examples that would exhibit you ways quite a few layout and implementation judgements have an effect on the habit and function of your platforms. professional SQL Server Internals covers a a number of SQL Server types beginning with SQL Server 2005 the entire method as much as the lately published SQL Server 2014. you will find out about new SQL Server 2014 positive aspects together with the hot Cardinality Estimator, In-Memory OLTP Engine (codename Hekaton), and Clustered Columnstore Indexes. With seasoned SQL Server Internals, you've gotten a superb roadmap for figuring out the intensity and tool of the SQL Server database backend, whatever the model and variation of SQL Server you utilize.
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Listing 2-9. Data(VarcharKey) select convert(varchar(10),ID) from IDs; The clustered index key column is defined as varchar, even though it stores integer values. Now let’s run two selects, as shown in Listing 2-10, and look at the execution plans. info Chapter 2 ■ Tables and Indexes: Internal Structure and Access Methods Listing 2-10. Data where VarcharKey = convert(varchar(10),@IntParam) As you see in Figure 2-14, in the case of the integer parameter, SQL Server scans the clustered index converting the varchar to an integer for every row.
Info Chapter 2 ■ Tables and Indexes: Internal Structure and Access Methods Figure 2-9. Ordered index scan execution plan It is worth mentioning that the order by clause is not required for an ordered scan to be triggered. An ordered scan just means that SQL Server reads the data based on the order of the index key. SQL Server can navigate through indexes in both directions, forward and backward. However, there is one important aspect that you must keep in mind. SQL Server does not use parallelism during backward index scans.
Estimated Number of Rows indicates the number of rows SQL Server estimated during the Query Optimization stage. In our case, SQL Server estimates that there are 2,625 rows with ISBNs starting with ‘114’. If you look at the histogram shown in Figure 3-2, you will see that step 10 stores the information about the data distribution for the ISBN interval that includes the values that you are selecting. Even with linear approximation, you can estimate the number of rows close to what SQL Server determined.