java - Batch insert in MariaDB with on duplicate key update -


i have following table cl:

id - int(10) primary key contact - int(10) list - int(10)

with unique index on contact , list. when run concurrently following query in batch 100 records:

insert cl(list, contact) values (?, ?) on duplicate key update cl.id = cl.id

under high pressure fails in 20% following error:

java.sql.sqlsyntaxerrorexception: have error in sql syntax; check manual corresponds mariadb server version right syntax use near 'on duplicate key update cl.id = cl.id' @ line 1

80% of queries runs fine. when rerun failed queries same parameters, again 20% fail.

why of queries fail , produce no errors when executed second time?

changing query to

insert ignore cl(list, contact) values (?, ?)

solved issue. though unclear why mysql throwing java.sql.sqlsyntaxerrorexception instead of more unambiguous.


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