如果优化器首先连接两个表，那么连接结果可能十分庞大，并可能使用大量系统资源，如CPU和内存。

If the optimizer joins two tables first, the join results could be huge and may use a large amount of system resources such as CPU and memory.

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优化内存堆和DB 2注册表变量。

Tuning memory heaps and DB2 registry variable.

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优化内存堆和DB 2注册表变量。

Tuning memory heaps and DB2 registry variable.

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