oracle：11.2.0.4
os：Oracle-linux 5.8
最近开发组同事提过来一个sql，该sql 对两个分区表(只是对于单个分区操作)做 hash join，太慢了 大致 需要 5s。
执行计划如下：
请大家帮忙看看，给点整改建议。
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