大家在查： `IAttributeAnnotatable` 馕饼 Schaff 多· 条件训练 1924-1993 爱丽舍 2005年10月12 潘志强 HirofumiHirano

ForestofTrees

With a Forest of Trees index , the database architect can specify one or more of the leading columns to be used to create a hash key .

Forest of Trees indexes combine many of the advantages of a hash index with those of a traditional Informix B+tree index .