Question
How do I access all active sessions on the server?
Answers
You can't access one user's session from another session (even if you are physically at the machine). However, you
can follow our cart example to some extent, and store all the session data in a database. Keep a column called
'active' which indicates whether the user is still there. When the user logs out (or after a specified time period,
which you can schedule using a job in SQL Server), you turn the active flag to off. Passing a single integer session
variable around, and querying the database when you need to, is much more efficient and scalable than storing all
those values in session variables anyway (even if you need all the values on every single page!). I just finished reworking
a very major application to handle things this way (partly for performance, and partly because the session
variables were becoming unruly and unpredictable).
Remember, don't use sessionID as a key, and expect to uniquely track users (see Article #2085 for more info).
If you're interested simply in counting the number of active sessions on the server, see Article #2491.
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