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I am using mysql with InnoDB databases.
If all my transactions are Inserts and Selects (no updates), I assume I would not have to worry about SQL deadlocking.
I can’t see a scenario where deadlocking would occur. Am I correct to assume deadlocking cannot occur if I only do Inserts and Selects?
May not be relevant but everything transaction is done with PDO
No. You still have to worry about SQL deadlocking.
You can get deadlocks even in the case of a transaction that inserts a single row. This is because the insert operation is not really atomic and locks are set automatically on the (possibly several) index records of the inserted row.