问题
单项选择题
The most commonly used locked level in implementing concurrency control is at which of the following levels ( )
A．record
B．database
C．table
D．field
答案
参考答案：A
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The most commonly used locked level in implementing concurrency control is at which of the following levels ( )
A．record
B．database
C．table
D．field
参考答案：A