On Friday, June 3, 2016 at 7:49:23 AM UTC-4, Krishnakant wrote:
>
> So it will have no performance difference is it? 
>

> If both do same thing then how and why will explicit connection help me 
> better? 
>

the `engine.execute()` will be slower, because you will be 
creating/checking-out a different connection for each operation in the 
for-loop and (needlessly) leveraging the sqlalchemy connection pool.  if 
you use `connection.execute()` with a single connection, then you don't 
have as much overhead involved with the connection pool management.

Your errors are probably from improperly implementing the connection pool. 
 I suggest re-reading the connection pool docs and faq to get a better 
understanding of what it does and why it does that.

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