Column locking is useful for when you want to freeze a column or collection of columns while scrolling and reviewing data in the other columns.
当您想要在滚动或查看其他列数据时冻结一个或一组列时将会很有用。
In fact, with the exception of column c, every run with biased locking turned on ended up providing approximately the same boost in performance.
事实上，除了C列以外，每次运行时如果开启偏向锁最终都会提供大致相同的性能提升。
We add an extra integer column to the table for which optimistic locking is required; this holds a revision counter.
向要使用乐观锁定的表中添加一个额外的整数列；该列保存修订计数器。
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