Call now: 252-767-6166  
Oracle Training Oracle Support Development Oracle Apps

 E-mail Us
 Oracle Articles
New Oracle Articles

 Oracle Training
 Oracle Tips

 Oracle Forum
 Class Catalog

 Remote DBA
 Oracle Tuning
 Emergency 911
 RAC Support
 Apps Support
 Oracle Support

 SQL Tuning

 Oracle UNIX
 Oracle Linux
 Remote s
 Remote plans
 Application Server

 Oracle Forms
 Oracle Portal
 App Upgrades
 SQL Server
 Oracle Concepts
 Software Support

 Remote S


 Consulting Staff
 Consulting Prices
 Help Wanted!


 Oracle Posters
 Oracle Books

 Oracle Scripts

Don Burleson Blog 







Oracle uptime tips

Oracle Database Tips by Donald BurlesonJuly 14,  2015

Question:  I am seeking a way to measure my instance startup time and shutdown times so that I can make reports of system uptime.  Are there any views in the V$, AWR or ASH tables that gives us the complete history regarding the startup and shutdown of databases.

Answer:  Startup information is stored in v$instance.startup_time, and uptime can be easily computed as sysdate - startup_time, but shutdown data is problematic.

During a normal shutdown, Oracle writes message to the alert log, but under an emergency abort (i.e. un-plug the server), nothing appears in the logs, nor within Oracle. Oracle stops abruptly, and there is no way to see it, except periodic daemon polling for a PMON or SMON process.

Startup and shutdown are written to the alert log, externally, but you could define the alert log as an external table and then make a SQL query to parse out the shutdown and startup messages.

Or, try this query to see uptime, from v$instance and compute the total uptime for the database.

   'Hostname : ' || host_name
   ,'Instance Name : ' || instance_name
   ,'Started At : ' || to_char(startup_time,'DD-MON-YYYY HH24:MI:SS') stime
   ,'Uptime : ' || floor(sysdate - startup_time) || ' days(s) ' ||
   trunc( 24*((sysdate-startup_time) -
   trunc(sysdate-startup_time))) || ' hour(s) ' ||
   mod(trunc(1440*((sysdate-startup_time) -
   trunc(sysdate-startup_time))), 60) ||' minute(s) ' ||
   mod(trunc(86400*((sysdate-startup_time) -
   trunc(sysdate-startup_time))), 60) ||' seconds' uptime

If you assume that PMON startup time is the same as the database startup time, you can get the uptime here:

   to_char(logon_time,'DD/MM/YYYY HH24:MI:SS')



Oracle Training at Sea
oracle dba poster

Follow us on Twitter 
Oracle performance tuning software 
Oracle Linux poster


Burleson is the American Team

Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

Verify experience! Anyone considering using the services of an Oracle support expert should independently investigate their credentials and experience, and not rely on advertisements and self-proclaimed expertise. All legitimate Oracle experts publish their Oracle qualifications.

Errata?  Oracle technology is changing and we strive to update our BC Oracle support information.  If you find an error or have a suggestion for improving our content, we would appreciate your feedback.  Just  e-mail:  

and include the URL for the page.


Burleson Consulting

The Oracle of Database Support

Oracle Performance Tuning

Remote DBA Services


Copyright © 1996 -  2017

All rights reserved by Burleson

Oracle ® is the registered trademark of Oracle Corporation.

Remote Emergency Support provided by Conversational