intermediateDatabase420 of 469
Optimistic vs pessimistic locking. How does database optimistic locking differ from Java synchronization?
Tests whether you know DB optimistic locking (a version column checked on update) assumes conflicts are rare and detects them after the fact, rejecting the write if the version changed -- unlike Java's synchronized, which proactively blocks other threads and only works within a single JVM, not across concurrent transactions from different instances.
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