When using large (1GB+) SQLITE tiles database, Osmand my hang when 
switching from the SQLITE map to another map (for example to a vector one). 
It may also hang when switching to the SQLITE map or at random other time.

The map is also taking a lot more space than it should.

I think the problem is that the SQLITE database is in read/write mode and 
it's trying to create temporary files (wal / shm) that can themselves take 
several GB.

A temporary work-around is to set the "tiles" directory and the SQLite 
files as read only. Which is not that easly to do on non-rooted Android 
phone.

It would be great to have an option to open SQLITE maps into read only mode 
to avoid this problem. (And because you don't need/want to modify/update 
them if you prepare them with a tool on a computer)


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