Multiple deleted sessions, about 1 per minute

[jking]

Bruce,

     I have a number of dll web apps running in the multi-site host app.  All built with C11.0.13505 and NT 11.48.  All are hosted on a Windows Server 2012 R2 machine.  I have been monitoring the log for a day or two and see a lot of "deleted sessions" in a row.  Seems about 1 minute between these deleted sessions.  There are about 35 of these in a row, with others sporadically spread above and below this section.  Please see the attached image.

There have not been many users logging in today so wondering what could be causing this and is it anything to worry about?

Thanks,

Jeff King

 

[Bruce]

no, it's nothing to worry about - this is normal.

Firstly, garbage collection (ie checking for expired sessions) happens about once a minute (actually not a round number.) So, yes, they are going to happen in "batches".

Secondly, the number of threads allowed to be used for deleting sessions is small, so as not to impact overall server performance. So if there are a large number of sessions then it can take several minutes to work through them all.

Incidentally, if you load the server, and there's a state file in play, then all of those sessions will likely have expired, and will need to be deleted soon after the server starts.

Cheers
Bruce