python
SQLAlchemy database connection lost
sqlalchemy\.exc\.OperationalError.*server closed the connection unexpectedly
Fixes
- 1.Set pool_pre_ping=True in create_engine() to verify connections
- 2.Configure pool_recycle to a value less than DB timeout
- 3.Add retry logic with tenacity or custom exception handler
sqlalchemyconnection-pool
Related Errors
python3 fixes
Asyncio event loop already running
RuntimeError: This event loop is already running
- •Use nest_asyncio.apply() to allow nested event loops
- •Use asyncio.run_coroutine_threadsafe() instead of asyncio.run()
python3 fixes
Coroutine never awaited
RuntimeWarning: coroutine '.*' was never awaited
- •Add 'await' before the coroutine call
- •Use asyncio.create_task() to schedule the coroutine
python3 fixes
Asyncio task was cancelled
asyncio\.CancelledError
- •Handle CancelledError in try/except within the task
- •Use asyncio.shield() to protect critical sections from cancellation