[horde] Database performance problem with Horde3/IMP4 with large user base

[Ben Chavet]

> As for caching, caching in the session would be pretty easy; if we're
> careful it shouldn't even affect session size too much. The flip side
> is that permissions changes would take a logout/login cycle to show up
> - would that be acceptable to people? (yes, if you initiate the change
> yourself, it can be flushed from _your_ session, but flagging other
> sessions would be tricky and might end up losing us the performance
> gains anyway).

My vote is no.

I'd rather not require users to logout/login for perms changes.

--Ben
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