This will help to avoid the chance for resource contention that can severely degrade performance, or lead to a record dead lock condition.
这将有助于避免出现资源争用，资源争用可能会严重降低性能，或者会导致出现记录死锁情况。
2
Transaction 1 reads a specific record and places a lock on that row.
事务1读取某条特定记录并对该行应用一个锁。
3
Earlier, we mentioned that to be allowed to change employee address data, you must first lock the employee record, make the changes, and finally unlock the record.