Can PostgreSQL UPDATEs in autocommit mode deadlock?
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07-03-2021 - |
문제
Is it possible for UPDATEs in PostgreSQL to deadlock when in autocommit mode? If so, how, and why? (Or, why not?)
해결책
That is certainly possible if the update affects more than a single table row.
This can come to pass in two ways:
The query modifies more than a single row in the target table.
The updated table has a foreign key constraint to another table. In that case, you may end up with a
FOR KEY SHARE
lock on the referenced table.
The deadlock can happen if your statement successfully locks a couple of rows and then blocks on a lock on some other row.
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