javascript barcode scanner example 25: Performance Tuning in Software

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25: Performance Tuning
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Schedule SQL tuning task in Database Control
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Set as input to the SQL Tuning Advisor When you click the Top Activity link in Figure 25-3, you see the Top Activity page in Figure 25-4 At the bottom of the page, you see the Top SQL activity for the selected time period, which in this example is from about 1:14 PM to 1:19 PM The top SQL includes the execution of a PL/SQL package, an UPDATE statement, and an INSERT statement Clicking the Select All link adds all three of these statements to a SQL
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Tuning Set that you can use on the SQL Tuning Advisor page in Figure 25-3 After clicking the Select All link, click the GO button next to the Schedule SQL Tuning Advisor action in the drop-down menu You will see the page in Figure 25-5 with a SQL Tuning Set created from the SQL statements you selected on the previous page In Figure 25-5, you schedule a comprehensive analysis of the selected SQL statements You also want to run the job immediately Clicking SUBMIT submits the job for processing Figure 25-6 shows the job in progress After the job submitted in Figure 25-5 completes, you see the results of the analysis You can also access the results from the Advisor Central page, as you can see in Figure 25-7
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25: Performance Tuning
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PART III
Figure 25-5
Schedule SQL Tuning Advisor with SQL Tuning Set
Figure 25-6
SQL Tuning Advisor job progress
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Figure 25-7
Advisor Central task results
Clicking the SQL Tuning Advisor task name or selecting the radio button next to the task and clicking VIEW RESULT, you see the results of the analysis in Figure 25-8 Note that the results include recommendations for user SQL (eg, RJB) and for system accounts (eg, SYSMAN and DBSNMP) Each SQL statement has one or more types of recommendation, including statistics gathering, creating a SQL Profile, creating an index, or revising the SQL statement itself You can implement the SQL Profile recommendation by clicking IMPLEMENT ALL PROFILES
25: Performance Tuning
PART III
Figure 25-8
SQL Tuning Advisor recommendations summary
Selecting the radio button for the fourth SQL statement in Figure 25-8, you can see a detailed explanation of all recommendations for this SQL statement in Figure 25-9 In Figure 25-9, you are advised to implement one of the recommendations, such as saving a SQL Profile for future executions or creating an index on one of the tables in the SQL query
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Figure 25-9
SQL Tuning Advisor detailed recommendations
The SQL Tuning Advisor API: the DBMS_SQLTUNE Package
If you need to have more control over your tuning tasks or want to run a specific set of tuning tasks repeatedly, you can use the DBMS_SQLTUNE PL/SQL package to create, run, and monitor a SQL Tuning Advisor job For a basic analysis of a SQL statement, you will use the following procedures within DBMS_SQLTUNE: CREATE_TUNING_TASK Tuning Set EXECUTE_TUNING_TASK TUNING_TASK REPORT_TUNING_TASK SQL Tuning Advisor Create a tuning task for a SQL statement or a SQL Execute a tuning task created with CREATE_ Show the results and recommendations from the
In addition, you can use the following data dictionary views to query the name and status of tuning jobs: DBA_ADVISOR_LOG Task names, status, and execution statistics for all tasks
25: Performance Tuning
DBA_/USER_ADVISOR_TASKS More detailed information about advisor tasks, such as advisor name, user-specified description, and execution type for the current user V$ADVISOR_PROGRESS More detailed information about the completion status and time remaining for an advisor task Exercise 25-3: Run the SQL Tuning Advisor for a SQL Statement In this exercise, you will use DBMS_SQLTUNE to generate recommendations for one of the SQL statements in Figure 25-8 1 Connect to the database with SQL*Plus as user SYSTEM, and create the table to be used in this exercise:
create table object_analysis as select * from all_objects;
PART III
2 These commands, executed at the SQL prompt, will create a variable to store the name of the task, create a task to tune one statement, and then run the task:
variable vtask varchar2(100); execute :vtask := dbms_sqltunecreate_tuning_task(sql_text=>'select distinct object_id from object_analysis'); execute dbms_sqltuneexecute_tuning_task(:vtask);
3 Retrieve the recommendations from the tuning task, first setting up SQL*Plus to display them:
set long 10000 set longchunksize 10000 select dbms_sqltunereport_tuning_task(:vtask) from dual;
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