Why is the "ci_sessions" table type MyISAM?

[eluser]RaZoR LeGaCy[/eluser]
To start; thank you both for the help.

WanWizard
I removed/optimized (Added better indexes) to a few more queries but I think I will still need to increase the Qcache. How can I do that?

Crimp
I changed some tables that do not have frequent writes to MyISAM. That should free up memory.

How long will it take in order to re-check phpMyAdmin status tab to see what is now red after these changes? Should I restart and wait 2-3 days or can I just leave the system and then re-check in 2-3 days.

I still have the issue of 5 ci_session writes per page view. I use db_session.

I know that one ci_session write writes to the
flash:new:flashMessage\";s:32:\"You have successfully logged in.\";,
then the other writes to
flash:new:flashMessage\";s:32:\"You have successfully logged in.\";s:22:\"flash:old:flashMessage\";s:32:\"You have successfully logged in.\";
the other
flash:old:flashMessage\";s:32:\"You have successfully logged in.\";
the other
flash:old:flashMessage\";s:32:\"You have successfully logged in.\";
then
flash:old:flashMessage\";s:32:\"You have successfully logged in.\";s:22:\"flash:new:flashMessage\";b:0;

Hope that helps in finding out this problem.