Finally, give out the multi-level reversal index strategy.

最后，给出了倒排索引的分级索引方案。

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The most common in-memory database index strategy is called T-tree.

最常见的内存中数据库索引策略是T -树。

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The strategy of using byte index values in the place of tags reduces the size of restructured documents somewhat, but also limits the algorithm to handling DTDs with fewer than 254 distinct tags.

使用字节索引值来代替标记的策略在某种程度上减少了重新构造后的文档的大小，但也限制算法只能处理不同标记数少于254的DTD。

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To date, Index Strategy Maps have been adopted by two companies, Morningstar, Inc. and ETFguide.com.

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He sees an advantage to this planned ETF in that investors who are used to passive ETFs will now be able to use this active ETF rather than having to constantly move money from one passive index strategy to another.

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In addition, active strategies are always more complex than a passive index fund strategy.

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