Background: Our Craft 2 site has been working for years. Now I want to upgrade to Craft 3. On a test machine, I have been having problems with the upgrade process. I have tried 3 classes of things:
- Install Craft 3 from scratch. This is working, but I'd really like to bring the old database along.
- Install Craft 3 and the old database, and try to do the upgrade.
- Just duplicate the old Craft 2 system with the old database, to get something to work.
The problem: Anything I do with the old database (#2 or #3, above) is likely to cause Apache2 to go berserk, using up all memory and swap and bringing the system to a nearly complete halt. Not every page does this, but, for example, the CP Entries page does this when it attempts to list entries.
I haven't been able find any errors in logs, though I'm not especially adept at that. Any thoughts?