Our first major problem is that we are scanning the full bills table every time we want a row out of it and locking every row we read.

我们的第一个主要问题是，当我们想要一行的内容时，我们会扫描整个账单表，并锁定我们读取的每一行。

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In other words, we have sequentially scanned this table, locking every row, a lot of times.

换句话说，我们顺序地扫描了此表，锁定了每个行，操作进行了很多次。

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Concurrency control Supports table and row level locking.

并发控制支持表级和行级锁。

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