We are running both UDB V7.2 and UDB V8.1, and it's taking somethimes more that 5 mins to activate a database.....
In general, what can be done to speed up a database activation..... dbm configuration and db configuration.
(Some of our database has more than 300 tablespaces.......)

thanks

You can use the activate database command, so that when all the applications are not using the database, it remains activate, until you again
deactivate it.

regards & thanks,

Mujeeb

we find that activate database is slow.......

Look at the value for softmax. Look at the size of logs. reduce the number of logs that db2 has to go through on activation.

Also, ensure that the logs are available on faster disk. If you are archiving, you may want to look at what you are archiving to (disk/tape) and figure out a way to get the logs back faster to the primary archive path.

One of the other things that comes to mind is how frequently the os is recycled. We have found a regular recycle to be very effective.

Hope this helps.

What does "how frequently the os is recycled" mean?

"os recycled" probably means restart computer operating system.