-
+
Concurrency Control
mode — but the semantics are all the same. The only real difference
between one lock mode and another is the set of lock modes with
which each conflicts (see ).
- . Two transactions cannot hold locks of conflicting
+ Two transactions cannot hold locks of conflicting
modes on the same table at the same time. (However, a transaction
never conflicts with itself. For example, it might acquire
ACCESS EXCLUSIVE lock and later acquire