For a given SQL statement, there are often multiple access path choices, and the different access paths usually have different performance characteristics.
对于一个给定的sql语句，往往有多个访问路径选择，而不同的访问路径具有不同的性能特点。
For a given SQL statement, there are often multiple access path choices, and the different access paths usually have different performance characteristics.
对于一个给定的sql语句，往往有多个访问路径选择，而不同的访问路径具有不同的性能特点。
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