SQLite doesn’t work great for concurrent access.  Or is the database file just 
stuck in a locked state?   try copying it to a different file.


On Dec 19, 2013, at 12:51 AM, AM <[email protected]> wrote:

> PS:
> 
> The only thing I can think of that is not quite usual is that I have a save 
> method on my models and that calls flush() on the session object.
> 
> and the session is created using:
> 
> DB = scoped_session(sessionmaker(extension=ZopeTransactionExtension()))
> 
> 
> Thanks.
> AM
> 
> 
> On 12/18/2013 09:35 PM, AM wrote:
>> Hi All.
>> 
>> I have a pyramid app, that uses sqlite via sqlalchemy when run in
>> development.
>> 
>> The configuration used:
>> 
>> sqlalchemy.url = sqlite:///%(here)s/pyp.sqlite?pool_size=1
>> sqlalchemy.isolation_level = SERIALIZABLE
>> 
>> The application initializes the engine using:
>> 
>>     settings = config.get_settings()
>>     engine = sa.engine_from_config(settings, 'sqlalchemy.')
>>     DB.configure(bind=engine)
>>     BASE.metadata.bind = engine
>> 
>> 
>> Another part of the application that runs as a daemon also uses the same
>> setup. This daemon always starts after the app. The daemon initializes
>> the engine using the same piece of code.
>> 
>> When the application tries to insert a record in the database I get the
>> following error:
>> 
>> OperationalError: (OperationalError) database is locked
>> 
>> I am fairly certain I had this working previously quite some time back
>> but for the life of me cannot remember how.
>> 
>> Any help would be greatly appreciated.
>> 
>> Thanks.
>> AM
> 
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