Hi,

The changes that are pending in the wal and shm files are written into the 
database automatically when the last connection to the database is closed 
https://sqlite.org/wal.html. There are other ways to invoke checkpoint, but if 
you have for example opened some layer from the database into QGIS map the 
checkpoint cannot write the changes into the database because QGIS and SQLite 
must have a common understanding about what was the contents of the layer when 
QGIS opened it. Closing the connections when you do not need them anymore 
should help with the max 64 problem as well.

-Jukka Rahkonen-

Shane Carey wrote:

>After processing, is there a way to release the wal and shm files? I'm on
>qgis3.4.

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