What is an active session?
Any session in which the visitor is still exploring your web application is considered an “Active Session”. When no new page is added within the configured timeout period (for example, the visitor closes their browser window or abandons the site), the session information is considered a completed session.
What is Active session History?
Active Session History (ASH) was introduced in Oracle 10g. It samples the activity of each active database session every second. The data is held in a buffer in memory in the database. The design goal is to keep about an hour (your mileage will vary). If a session is not active it will not be sampled.
What is DB time?
Database Time, or DB Time, is defined by Oracle as the total time by foreground sessions executing database calls. This includes CPU time, IO time, and non-idle wait time. In other words, it’s the total time spent either actively working or actively waiting in a database call.
How do I check active sessions OEM?
Open the performance page of a database, here in the Average Active Session chart, click on the CPU block on the chart of its corresponding wait class. The Active Sessions Working page appears.
What is active session timeout?
Session timeout represents the event occuring when a user does not perform any action on a web site during an interval (defined by a web server). The event, on the server side, changes the status of the user session to ‘invalid’ (ie.
What is a Facebook session?
Sessions are used to keep you logged into your favorite websites and services and were initially developed to time out to prevent someone else from accessing any of your sensitive data. Facebook uses sessions in much the same way but generally reserves these sessions for apps and other third-party services to keep your …
How can I get ash report?
To generate an ASH report on the local database instance using the command-line interface:
- At the SQL prompt, enter: @$ORACLE_HOME/rdbms/admin/ashrpt.sql.
- Specify whether you want an HTML or a text report: Enter value for report_type: text.
What is CPU wait in Oracle?
“CPU Wait” time is Oracle foreground process OS CPU run queue time. So I’m very comfortable stating that when DB Time is greater than Oracle process CPU consumption plus the non-idle wait time, it’s probably the result of Oracle foreground process CPU run queue time.
What is average active sessions Oracle?
Average Active Sessions (AAS) is the ratio of the change in Database Time (time in the database in seconds spent using CPU, IO, waiting) divided by the clock time. It is not a measure of how many sessions exist in the system at a given time, but rather how busy the database is. Seconds/s is the term in Oracle as well.
What is AWR db time?
The DB Time is a time model statistic that is the sum of all Oracle process’ CPU consumption plus the sum of non-idle wait time. This “time” in AWR is the same as DB Time and it is the same as the DB Time statistic name in v$sess_time_model and v$sys_time_model.
What is idle logout time?
The session inactivity timeout setting represents the amount of time a user can be inactive before the user’s session times out and closes. It only affects user browser sessions. You can set the values from 5 minutes to 60 minutes. This function has a default value of 30 minutes.
What is average activity of an active session?
An Active Session in oracle is defined as an Oracle session currently spending time in a database call, and the average activity of a session is the ratio of active to total wall clock time It is the time which user experiences when running a query.
How to calculate average active sessions (AAS) in a database?
To calculate AAS, we need another metric called “DB Time” which represents the total time spent in the database by sessions, either working or waiting (The real work done in the database). This DB time is divided by the clock elapsed time to obtain the Average Active Sessions.
What is the difference between DB time and average active sessions?
At a macroscopic level, DB Time is the sum of DB time over all sessions. Average Active Sessions, or AAS, represents the sum of active sessions over all sessions, at any given point in time. The Average Active Sessions metric is important because it’s best representation of your database system load.
What is an active session in Oracle Database?
An Active Session in oracle is defined as an Oracle session currently spending time in a database call, and the average activity of a session is the ratio of active to total wall clock time Elapsed time