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The V$SQL view helps you find out which of your queries have high logical I/O (LIO) and high physical I/O (PIO). By also providing the number of rows processed by each statement, it tells you whether a statement is efficient or not. By providing the disk reads and the number of executions per statement, the view helps you determine whether the number of disk reads per execution is reasonable. If CPU usage is your concern, look at the statements that have a high number of buffer gets. If I/O is your primary concern, focus on the statements that perform the most disk reads. Once you settle on the statement you want to investigate further, examine the complete SQL statement and see whether you (or the developers) can improve it. One of the best ways to find poorly performing SQL queries is by using the Oracle wait interface, which I explain in detail in 20. Here s a query that uses the V$SQL view to sort the top five queries that are taking the most CPU time and the most elapsed time to complete: SQL> SELECT sql_text, executions, 2 ROUND(elapsed_time/1000000, 2) elapsed_seconds, 3 ROUND(cpu_time/1000000, 2) cpu_secs from 4 (select * from v$sql order by elapsed_time desc) 5* WHERE rownum <6; SQL_TEXT EXECUTIONS ELAPSED_SECONDS --------------------------------------------------DELETE MS_DASH_TRANLOGS... 2283 44.57 UPDATE PERSONS SET... 14132 19.74 SELECT /*+ INDEX(ud)... 9132 9.95 SELECT PROG_ID FROM UNITS ... 14132 5.26 SELECT NVL(SUM(RECHART),0)... 2284 4.13 SQL>

CPU_SECS --------43.04 20.52 9 5.81 4.43

The V$SQL_PLAN and V$SQL_PLAN_STATISTICS views are highly useful for tracking the efficiency of execution plans. You should be wary of quick changes in code to fix even the worst-performing query in the system. Let s say you create an extra index on a table or change the order of columns in a composite key to fix this problem query. How do you know these aren t going to impact other queries in the application adversely This happens more often than you think, and therefore you must do your due diligence to rule out unintended consequences of your fixes.

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Thus the queries on the object view components_or_view give results similar to our equivalent object table, components_nt. The following is another select statement from the object view as an illustration. Notice that we no longer need to use the nested_table_get_refs hint here, as there is no nested table in our object view! If we do supply the hint, it will be ignored. benchmark@ORA10G> select p.* 2 from components_or_view c, TABLE (c.parts) p; COMPONENT_ID PART_ID PART_NAME PART_DESC ------------ ------- ---------- -------------------1 1 part11 part 11 desc 1 2 part12 part 12 desc 2 3 part21 part 21 desc 2 4 part22 part 22 desc If our inserts, updates, and deletes are done directly on the underlying tables components_rel and parts_rel (not on the view components_or_view), then we are done as far as the object view solution goes. But what if we wanted to carry out inserts, updates, and deletes directly on the object view (instead of on the relational tables on which it is based) In such situations, we need to define instead of triggers on the object view.

After all, what is the source of energy that powers the motion of the electron clouds in orbit around the atoms nuclei Is this not an example of a perpetual motion machine that defies human attempts to invent one at the level of classical physics because of the conservation laws Sam flashed a simple scenario before him of a ceiling fan The blades are discrete when they are not in motion Their position is clearly observable by the human senses Turn the fan on at high speed It s a matter of a flip of a switch Suddenly, the human senses perceive a whirling circle and lose sight of the individual blades Commonsense human experience dictates that you don t stick your hand into that circle.

You can use the SQL Tuning Advisor to improve poorly performing SQL statements. The SQL Tuning Advisor provides the following to help you tune bad SQL statements: Advice on improving the execution plan Reasons for the SQL improvement recommendations Benefits you can expect by following the Advisor s advice Details of the commands to tune the misbehaving SQL statements

The SQL Tuning Advisor can use the following sources: New SQL statements. When working with a development database, this may be your best source of SQL statements. High-load SQL statements. SQL statements from the AWR. SQL statements from the database cursor cache. The Advisor can tune sets of SQL statements called SQL Tuning Sets. An STS is a set of SQL statements combined with execution information, which includes the average elapsed time. An STS has the advantage of capturing the information about a database s workload as well as allowing you to tune several large SQL statements at once.

Note instead of triggers provide a transparent way of performing DMLs on views. These triggers are called instead of triggers because, unlike other types of triggers, Oracle fires the trigger instead of executing the triggering statement. For more information on this and other types of triggers, see the section Types of Triggers in 22 of Oracle Database Concepts (10g Release 1).

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