In addition to transaction locking, this approach is needed to control the concurrency of applications on a higher level.
除了事务锁定之外，这种方式可以在更高的级别上控制应用程序的并发性。
Concurrency control and logging happens on the level of full documents.
并发控制和日志记录在完整文档级进行。
With optimistic concurrency control, the database manager releases the row or page locks immediately after a read operation.
通过使用乐观并发控制，数据库管理器在完成读操作之后可以立即释放行或页锁。
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