Oracle Run Duration Average - SQL

Introduction

In Oracle database, one of the key performance metrics is the run duration of SQL queries. The run duration is the time taken by Oracle to execute a SQL query. Monitoring the run duration of SQL queries can help identify performance bottlenecks and optimize the database.

This tutorial will cover how to calculate the average run duration of SQL queries in Oracle using SQL code.

Steps

1. Connect to Oracle database:

CONNECT username/password@database_name

Replace username, password, and database_name with your credentials.

2. Enable SQL trace:

ALTER SESSION SET SQL_TRACE = TRUE;

This will enable SQL trace for the current Oracle session.

3. Run the SQL queries you want to monitor.

4. Disable SQL trace:

ALTER SESSION SET SQL_TRACE = FALSE;

This will disable SQL trace.

5. Query the SQL trace table to get the run duration of the SQL queries:

SELECT ROUND(AVG(elapsed_time/1000000),2) AS "Average Run Duration (s)"
FROM SYS.DBA_TIMED_STATISTICS
WHERE statistic# = (SELECT statistic#
                    FROM SYS.STATISTICS$
                    WHERE name = 'execute count')
AND value > 0;

This SQL code will calculate the average run duration of SQL queries in the database. It uses the SYS.DBA_TIMED_STATISTICS table to get the elapsed time for each SQL query and calculates the average run duration in seconds.

6. Disconnect from Oracle database:

DISCONNECT;

Conclusion

In this tutorial, we learned how to calculate the average run duration of SQL queries in Oracle using SQL code. Monitoring the run duration of SQL queries is an important task for optimizing Oracle databases.