Index options like UNIQUE and CLUSTER, and access methods like B-Tree, R-Tree and user-defined access methods can apply to both functional and non-functional indexes.
诸如unique和CLUSTER等索引选项，以及B - Tree、r - Tree等访问方法和用户定义的访问方法，可以同时应用于函数索引和非函数索引。
B-Tree operations tend to be limited to a single cluster.
型树操作往往被限制在单一的集群中。
Each cluster maintains a B-Tree of the records contained in that cluster and a unified B-Tree is constructed by linking clusters together.
每个集群维护着一个包含在此丛集中的记录的B型树。 而各种相连的集群一起组成了一个统一的B型树。
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