问题
Right now I get a blank page when localhost runs, but the deployed app is fine. The logs show the "database is locked". How do I "unlock" the database for localhost?
回答1:
This can happen if you're running multiple instances of dev_appserver without giving them distinct datastore files/directories. If you need to be running multiple instances, see dev_appserver.py --help and look at the options for specifying paths/files.
回答2:
Dave W. Smith has the right idea. I had this same issue and looking into the docs you need to set the --storage_path='some/path' to be different for each instance of the localhost.
From the Docs:
--storage_path PATH path to the data (datastore, blobstore, etc.)
Also, different port and admin_ports have to be set to run the two instances.
回答3:
I tried this and it worked, I noticed that when this happens, there are multiple pythonw.exe processes working in the process bar.
Go to command prompt, run the following
taskkill /f /im pythonw.exe
Restart your application from the app launcher
来源：https://stackoverflow.com/questions/20578757/how-do-i-unlock-the-app-engine-database-when-localhost-runs