Web Reference: Sep 28, 2015 ยท Both LOCK IN SHARE MODE and FOR UPDATE ensure no other transaction can update the rows that are selected. The difference between the two is in how they treat locks while reading data. LOCK IN SHARE MODE does not prevent another transaction from reading the same row that was locked. InnoDB implements standard row-level locking where there are two types of locks, shared (S) locks and exclusive (X) locks. A shared (S) lock permits the transaction that holds the lock to read a row. An exclusive (X) lock permits the transaction that holds the lock to update or delete a row. Feb 26, 2026 ยท The only real difference between one lock mode and another is the set of lock modes with which each conflicts (see Table 13.2). Two transactions cannot hold locks of conflicting modes on the same table at the same time.
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