> Shared cache mode would be better named "persistent cache mode" because 
> its main effect is to permit one thread to not flush the cache after 
> each transaction.  The people at Mozilla report that they use it and get 
> better throughput on small transactions.

You've probably read this. It's useful information for any performance
minded developer using SQLite:

  http://developer.mozilla.org/en/docs/Storage:Performance

Mozilla no doubt benefits from a shared cache, but its transaction throughput 
improvement is largely due to deferring all database write operations to a 
background thread, making the foreground database writes seem instantaneous. 
However, this lazy writing drops Durability in ACID. This is described in the 
above link.



       
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