Update distributed-transactions-ysql.md #23580
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Remove usage of the phrases "optimistic locking" and "pessimistic locking". Because "optimistic locking" doesn't really mean anything and is confused with Optimistic Concurrency Control is a totally different concept in the database community. We were using the phrase "optimistic locking" to point to the semantics of Fail-on-Conflict concurrency control mode and "pessimistic locking" to point to the semantics of Wait-on-Conflict concurrency control.
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Remove usage of the phrases "optimistic locking" and "pessimistic locking". Because "optimistic locking" doesn't really mean anything and is confused with Optimistic Concurrency Control is a totally different concept in the database community. We were using the phrase "optimistic locking" to point to the semantics of Fail-on-Conflict concurrency control mode and "pessimistic locking" to point to the semantics of Wait-on-Conflict concurrency control.