![]() Normally you can get this exception very rarely, but if not you should check your server for huge or "stalled" queries and optimise them.Īnd of coarse you can increase wait_timeout in myslq config file. # call this handler again with same argumentsĭon't forget to import exception class you catching from sqlalchemy.exc import InternalError This happens when server cannot acquire lock to process actions with table or database, try restarting transaction as advised in the exception: session_delete_mapping = Session() (InternalError) (1205, 'Lock wait timeout exceeded try restarting transaction') 'DELETE FROM user_role_mapping WHERE user_role_er_id = %s' ('3',) ![]() (User.id = user_id).delete()įlash("Oops something went wrong : "+ str(e)) Num_rows_deleted_user = session_delete_user.query(UserRoleMapping).filter(User.id = user_id).delete() Num_rows_deleted_map = session_delete_mapping.query(UserRoleMapping).filter(er_id = user_id).delete() My code session_delete_mapping = Session() I need to delete a row from both the tables using the user specific id. UserRoleMapping is referenced to User table using User.id => er_id. Also when the application was single-threaded it ran ok.I am trying to delete a row from two tables User and UserRoleMapping. Typically, a deadlock happens when two or more transactions are writing to the same rows, but in a different order. No other clients are using this database at the moment. check for space by running the command: df -h If it shows memory full try to free up some space on the hard-drive that you are using for the MySQL and retry. The Lock wait timeout exceeded try restarting transaction error will occur when a query cannot proceed because it is blocked by a rowlock. But as you can see I close and remove the session upon thread completion. So I assumed it leaves some connection active. : (MySQLdb._exceptions.OperationalError) (1205, 'Lock wait timeout exceeded try restarting transaction')Īs I can see first thread is executed without problems. The above exception was the direct cause of the following exception: MySQLdb._exceptions.OperationalError: (1205, 'Lock wait timeout exceeded try restarting transaction') 09:52:06,610 DEBUG Thread-10001280 build_network Committing transactionįile "/var/line 1277, in _execute_context 09:52:04,812 DEBUG Thread-10000060 build_network Committing transaction Here is a log of execution: 09:52:02,846 INFO MainThread build_network 1 of 109015. Target=_build_page_nodes, args=(node_id, traversing_nodes, update),ĭef _build_page_nodes(node_id, traversing_nodes, update):įirst thread executes fine. ![]() Session = scoped_session(session_factory) Data source is a bottleneck in my case therefore the data comes in chunks in multiple threads: engine = sessionmaker(bind=engine) I get error: 'Unable to execute UPDATE statement UPDATEinvoicetestSETIDTEST:p1 WHERE invoicetest. + 3042268: SQLSTATEHY000: Ge neral error: 1205 Lock wait timeout exceeded try restarting transaction The SE accepted answer and that article it links to, and existing core issues all say to use read committed. I work on a data import application that updates a database.
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