事务1读取某条特定记录并对该行应用一个锁。
Transaction 1 reads a specific record and places a lock on that row.
与图1类似，事务1读取某个特定记录，但随后即释放锁。
Similar to Figure 1, transaction 1 reads a specific record but then releases its lock.
您的方案可能丢失了关于应用于特定记录类型依赖包的信息。
Your schema might be missing the information that a dependent package has been applied to a specific record type.
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