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Even though most individual optimizations were small, cumulatively they were significant. To judge from the percentage improvements, no three or even four optimizations would have met my performance goal. But the final combination was effective. The moral of the story is that if you dig deep enough, you can make some surprising gains. The code tuning I did in this case is the most aggressive code tuning I ve ever done. At the same time, the final code is the most unreadable, unmaintainable code I ve ever written. The initial algorithm is complicated. The code resulting from the high-level language transformation was barely readable. The translation to assembler produced a single 500-line routine that I m afraid to look at. In general, this relationship between code tuning and code quality holds true. Here s a table that shows a history of the optimizations:

Table 4-1 is identical to Table 2-1, and it shows high-level descriptions of the main SELECT command clauses. Table 4-1. The Six Main Clauses of the SELECT Command

FIGURE 5-5 The relationship between the three columns of Act II is similar to the indented levels of headings in a sentence outline.

Optimization Implement initially straightforward Convert from bit fields to arrays Unroll innermost for loop Remove final permutation Combine two variables Use a logical identity to combine the first two steps of the DES algorithm Make two variables share the same memory to reduce data shuttling in inner loop Make two variables share the same memory to reduce data shuttling in outer loop Unfold all loops and use literal array subscripts Remove routine calls and put all the code in line Rewrite the whole routine in assembler Final

Benchmark Time 21:40 7:30 6:00 5:24 5:06 4:30

Which table(s) is (are) needed for retrieval What is the condition to filter the rows How should the rows be grouped/aggregated What is the condition to filter the aggregated groups Which columns do you want to see in the result In which order do you want to see the resulting rows

5

Improvement 65% 20% 10% 5% 12%

3:36

According to the ANSI/ISO SQL standard, these six clauses must be processed in the following order: FROM, WHERE, GROUP BY, HAVING, SELECT, ORDER BY. Note that this is not the order in which you must specify them in your queries. As mentioned in the introduction to this chapter, SQL retrieval statements (SELECT commands) are commonly referred to as queries. In this chapter, we will focus on queries using three SELECT command clauses: SELECT: With the SELECT clause of the SELECT command, you specify the columns that you want displayed in the query result and, optionally, which column headings you prefer to see above the result table. This clause implements the relational projection operator, explained in 1. WHERE: The WHERE clause allows you to formulate conditions that must be true in order for a row to be retrieved. In other words, this clause allows you to filter rows from the base tables; as such, it implements the relational restriction operator. You can use various operators in your WHERE clause conditions such as BETWEEN, LIKE, IN, CASE, NOT, AND, and OR and make them as complicated as you like. ORDER BY: With the ORDER BY clause, you specify the order in which you want to see the rows in the result of your queries.

Feel free to write Act II in a blank Word document using a traditional sentence outline if that works better for you just be sure to write complete sentences as described in the section Writing Headlines Using Three Ground Rules in 3, and discipline yourself to keep your indented headings to three levels. Some BBP practitioners use tools other than Word to write their story templates, including Microsoft Of ce Excel 2007, mind-mapping software, and even Post-it notes visit www.beyondbulletpoints.com to learn more.

3:09

1:36 0:45 0:22 0:22

The FROM clause allows you to specify which tables you want to access. In this chapter, we will work with queries that access only a single table, so the FROM clause in the examples in this chapter simply

49% 53% 51% 98%