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6. As indicated earlier, SQL Server generates the value of the CustomerId column to be the next number in a sequence when a record is added, as this column uses the IDENTITY functionality. This value can t be altered within the table, and so taking these two items of information and putting them together, you should be able to deduce that this value will be unique. Therefore, change the Is Unique option to Yes. 7. The final part of creating the index is to change the Create As Clustered option to No (Figure 6-3). The order of the records inserted into SQL Server won t change. And if you scroll down the screen, the Re-compute Statistics for This Index option should remain No.
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CHAPTER 6 CREATING INDEXES AND DATABASE DIAGRAMMING
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Figure 6-3. The clustering option in the Indexes/Keys dialog 8. Click Close and then close the table modification, answering Yes when you are asked if you wish to save the changes. This will add the index to the database. Building an index in Management Studio is a straightforward procedure, as you have just seen. Although this is the first index that you have created yourself, it took only a few moments, and there were just a couple of areas where you had to do any reasonable amount of decision making. We will cover those areas now. Choosing the name of the index and the columns to include is easy and is not worth dwelling on. You should know which columns to include from the discussions at the start of the chapter, where we examined the basics of building indexes. The first major decision you need to make is determining whether a column carries unique values. The column chosen for our first index is an identity column which, if you recall, is a column that cannot have data entered into it by any SQL command, as the data entered in to this column is completed automatically by SQL Server itself. Also, in an identity column, by default no two rows can have the same value. However, there is no automation to stop any attempt to create duplicate keys. Therefore, there is still a need to inform SQL Server that the index will be unique. Moving on to the Create As Clustered setting, the data in this table would be best held in CustomerId order. This is because each record that is inserted will have a higher CustomerId number than the previous record. Therefore, each time a record is added, it will be added to the end of the table, removing the need for a clustered index. As with the Is Unique option, the Create As Clustered option doesn t need to be selected. Finally, the Re-compute Statistics option defines whether SQL Server automatically recomputes the statistics on the index when data is modified. Take care with this option, as the dialog can cause confusion. For example, setting Re-compute Statistics to On actually switches the updating of statistics to Off.
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When retrieving data, SQL Server obviously has to make some decisions as to the best way to get to that data and return it to the query requesting it. Even if an index has been created on
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CHAPTER 6 CREATING INDEXES AND DATABASE DIAGRAMMING
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a set of columns, SQL Server may determine that it is better and faster to use another method to retrieve the data through a table scan, perhaps. Or maybe there are a couple of indexes that could be chosen to retrieve the same data. No matter what the scenario, SQL Server has to have some basis of information on which to make sensible and accurate choices. This is where statistics come in. SQL Server keeps statistics on each column contained within an index. These statistics are updated over a period of time and over a number of inserts or modifications. The specifics of how all of this works in the background, and how SQL Server keeps the statistics up to date, is an advanced topic. What you need to know is that if you alter or build an index on a table that has data in it, and you don t let SQL Server update the statistics on the table, then SQL Server could be using inaccurate information when it is trying to decide how to retrieve the data. It could even mean that the index change you thought would improve performance has in fact made the performance much slower. That said, it is not always prudent to let SQL Server recompute statistics automatically. SQL Server will do the updates when it feels they are required. This may happen at a busy time of processing; you have no control over when it will happen. However, if SQL Server does update the statistics, the query that caused the update to start is not impacted, as the statistics are updated asynchronously. It may be more efficient to manually update the statistics via a scheduled job. This is what you quite often see within production environments that have a number of inserts and modifications to the data.
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