1. always_anti_join来设置anti_join的方式，选择有：
星型连接、网状连接、哈希连接； Sort_Direct_writes ：
The SORT_DIRECT_WRITES initialization parameter is obsolete in release 8.1 and higher. If you had SORT_DIRECT_WRITES set to FALSE or AUTO in a past release,
then the sort buffers were kept in the buffer cache whenever possible. Because SORT_DIRECT_WRITES is obsolete in release 8.1, the sort buffers could go directly to
disk if you do not adjust your SORT_AREA_SIZE initialization parameter. 先给你找到了这些！！
星型连接、网状连接、哈希连接； Sort_Direct_writes ：
The SORT_DIRECT_WRITES initialization parameter is obsolete in release 8.1 and higher. If you had SORT_DIRECT_WRITES set to FALSE or AUTO in a past release,
then the sort buffers were kept in the buffer cache whenever possible. Because SORT_DIRECT_WRITES is obsolete in release 8.1, the sort buffers could go directly to
disk if you do not adjust your SORT_AREA_SIZE initialization parameter. 先给你找到了这些！！
解决方案 »
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