I have a group of tables which are heavily used in my application. I can’t show you the tables structure, because they are very large tables and actually it’s not necessary I think for this question.
So let’s say they are table
C. These tables are used by many processes of the application: online shop, payment processing, task scheduling, alert email sending, etc. It’s like
A is the Orders table,
B the Payments table, etc.
There is a scheduling process that launches a new execution of itself every 4 seconds. It launches a query to obtain one ordered record from
A and does something. This query:
Cand other tables
- Has conditions on all the three of them
- Uses the field
The query is executed inside a transaction that:
- Executes the query (
UPDATEs the record returned by the query
and then it
The problem is that other views in the application ask to execute
INSERT queries on
C and sometimes these
INSERTs causes the error:
Serialization failure: 1213 Deadlock found when trying to get lock; try restarting transaction
INSERTs always make part of larger transactions which include other
I need to use
FOR UPDATE on the query I explained above because it could possibly happen that the query is executed twice at the same time by two different processes: I must avoid that the same record is obtained by two different processes at the same time.
I’m using MySql 5.7.17 (MariaDB) with InnoDB tables, tx_isolation: READ-COMMITTED
How can I prevent those deadlocks?
Thank you very much
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