This feature increases the availability of the HDR primary server because replicating an index is quicker than dropping and then rebuilding the index on the primary server.

这个特性提高了hdr主服务器的可用性，因为与停止服务并在主服务器上重建索引相比，复制索引要快得多。

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This feature maintains the availability of the table within a production environment after an existing index has ceased to be efficient.

在现有的索引失效之后，这个特性可以在产品环境中保持表的可用性。

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A new feature of the query optimizer supports a new type of index scan, called an index self-join path.

查询优化器的一项新特性支持一种新的索引扫描，即索引自连接路径。

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