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SQL>SET PLAN; SQL>SELECT FIRST_NAMES, SURNAME FROM PERSON CON>ORDER BY SURNAME; PLAN (PERSON ORDER XA_SURNAME) FIRST_NAMES =========================== George Stephanie SURNAME ========= Abraham Allen

2. Run the first test. It will insert the same data into each table with a PL/SQL loop, as shown in Listing 4-5. The statement in the loop has bind variables, so it will only be parsed once. Listing 4-5. Populate the tables (INSERT statements use bind variables)

22

With another toggle command, you can have isql display some statistics about queries at the end of the data output, which can be very useful for testing alternative query structures and plans:

When you first install FogBugz, a single user is already set up as the FogBugz administrator conveniently named Administrator. This initial user does not count against your FogBugz license count. No matter how many licenses you purchase, you always get an administrator account for free. So if you have 12 people using FogBugz, and one of them will primarily function as an administrator, you only need to purchase 11 licenses. You ll certainly want to create other users, though. One of the strengths of FogBugz is its ability to track who has done what on any given case, and you can t do that if everyone is logging in as the same user.

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SQL>SET STATS ON; SQL> < run your query > PLAN.. < output > Current memory = 728316 Delta memory = 61928 Max memory = 773416 Elapsed time = 0.17 sec Buffers = 2048 Reads = 15 Writes = 0 Fetches = 539

An alternative toggle command, SET PLANONLY [ON | OFF], prepares the statement and displays the plan, without executing the query:

BEGIN FOR i IN 1..10000 LOOP INSERT INTO test_cons VALUES(i ,RPAD(TO_CHAR(i),11,'.') ... ,RPAD(TO_CHAR(i),30,'.') ); END LOOP; COMMIT; END; / The results are shown in Table 4-9. Table 4-9. Results of the First Test2

SQL>SET PLAN OFF; SQL>SET PLANONLY ON; SQL>SELECT FIRST_NAMES, SURNAME FROM PERSON CON>ORDER BY SURNAME; PLAN (PERSON ORDER XA_SURNAME)

If you intend to use the optimizer s plan as a starting point for constructing a custom PLAN clause, the expression syntax that is output is identical to that required in the statement s plan expression.3 Inconveniently, there is no provision in isql to capture the optimizer s plan into a text file.

the plan shown by isql nor accessible via the PLAN clause syntax for custom plans. The syntax surfaces only a subset of the real plan that the query engine will follow.

The following examples use queries that you can test yourself using the employee.fdb test database that is installed in your Firebird samples directory.4

BEGIN FOR i IN 1..10000 LOOP INSERT INTO test_nocons VALUES(i ,RPAD(TO_CHAR(i),11,'.') ... ,RPAD(TO_CHAR(i),30,'.') ); END LOOP; COMMIT; END; /

This query merely retrieves every row from a lookup table, in no specific order. The optimizer determines that, although an index is available (the primary key index), it has no use for it:

SQL>SET PLANONLY ON; SQL> SELECT * FROM COUNTRY; PLAN (COUNTRY NATURAL)

This is still a simple query, without joins:

SQL>SELECT * FROM COUNTRY ORDER BY COUNTRY; PLAN (COUNTRY ORDER RDB$PRIMARY1)

The constraints only add a small overhead to the execution time of the SQL. Therefore, the overhead of actually executing the constraints is small. 3. Run the second test. It inserts exactly the same data, but the SQL statement is generated with literal values and so has to be reparsed every time. The test code is shown in Listing 4-6.

Any FogBugz administrator can create a new user by selecting the Users item on the Settings menu. This opens the current user list, as shown in Figure 3-1.

However, the optimizer chooses the primary key index because it provides the requested ordering without the need to form an intermediate stream for sorting. Now, let s see what happens when we decide to order the same plain query on a non-indexed column:

SELECT * FROM COUNTRY ORDER BY CURRENCY; PLAN SORT ((COUNTRY NATURAL))

The cross join, which produces a generally useless set, does not use join criteria at all:

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