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You may have noticed that the WHERE clause in listing 1 provides the columns in the order that they appear in the ix_Customer_Name index. This is not a requirement in order for SQL Server to be able to use the index. If we reversed the order of the columns in the WHERE clause, SQL Server would still be able to use the index. But don t take my word for it. Let s look at another example to prove that this is indeed the case. Listing 4 shows the newly rewritten query that reverses the order of the columns in the WHERE clause.

In a computer, the term random access memory (RAM), often called simply memory, refers to ICs that store working data The amount, and speed, of memory are crucial factors in determining what a computer can and cannot do

SET NOCOUNT ON; DECLARE @BatchSize int, @RowCnt int; SET @BatchSize = 10000; SET @RowCnt = @BatchSize; WHILE @RowCnt = @BatchSize BEGIN; DELETE TOP (@BatchSize) FROM TransactionHistory WHERE TranDate < '20050101'; SET @RowCnt = @@ROWCOUNT; END;

When you ve created the script for your droplet, save the script as an application it won t work as a script Open the Save As dialog box by pressing z-S, if you haven t already saved the script, or z-SHIFT-S, if you have already saved it Choose Application in the File Format pop-up menu, and then choose suitable options in the Options area

This form of set-based iteration won t increase performance of the code. It s used to limit the impact of code on concurrency, but may make the code run slower. This form of set-based iteration isn t sophisticated enough to warrant much discussion. I merely wanted to include it for the sake of completeness. Using set-based

iteration to increase performance of problematic code takes, unfortunately, more than just adding a TOP clause to the query.

Data Flow Figure 33-3 shows how data moves in a computer among an internal hard drive, an external hard drive, and a CD-RW storage medium This process is controlled by the CPU When you open a file on any medium, the data goes immediately into the memory The CPU, under direction of the microprocessor, manipulates the data in the memory as you work on the file Thus, the data in memory changes from moment to moment When you hit a key to add a character, or drag the mouse to draw a line that shows up on your display, that character or line goes into memory at the same time If you hit the backspace key to delete a character, or drag the mouse to erase a line on the screen, it disappears from the memory

Clear the Startup Screen check box If you want the droplet to run smoothly, clear the Startup Screen check box Otherwise, the user will have to click through the startup information each time he or she launches the droplet Select the Stay Open check box If you expect the user to use the droplet more than once, select the Stay Open check box to make the droplet stay open after it has finished running Keeping the droplet open makes it run faster the next time the user drops a file on it

Adding running totals to a report is a common business requirement. It s also one of the few situations where declarative code often (though not always) results in poor performance. In this example, I ll use the AdventureWorks sample database to report all sales, arranged by customer, ordered by date, and with a running total of all order amounts for a customer up to and including that date. Note that the Microsoft-supplied sample database is populated with more than 31,000 orders for over 19,000 customers, and that the highest number of orders for a single customer is 28.

Figure 11-1 You may see this dialog box when you edit a droplet that you have already run Normally, you will want to click the Save button to save the changes you ve just made in AppleScript Editor

In current versions of SQL Server, the only way to calculate running totals in declarative code is to join each row from the table to all preceding rows for the same customer from itself, adding all those joined rows together to calculate the running total. The code for this is shown in listing 2.