How to improve INSERT INTO … SELECT locking behavior

Question

In our production database, we ran the following pseudo-code SQL batch query running every hour:

INSERT INTO TemporaryTable
    (SELECT FROM HighlyContentiou         


        

Answer 1

I was facing the same issue using CREATE TEMPORARY TABLE ... SELECT ... with SQLSTATE[HY000]: General error: 1205 Lock wait timeout exceeded; try restarting transaction.

Based on your initial query, my problem was solved by locking the HighlyContentiousTableInInnoDb before starting the query.

LOCK TABLES HighlyContentiousTableInInnoDb READ;
INSERT INTO TemporaryTable
    (SELECT FROM HighlyContentiousTableInInnoDb
    WHERE allKindsOfComplexConditions are true)
UNLOCK TABLES;