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Results tagged with index
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user 115785
A database structure that can improve the speed of queries at the cost of disk space and slower inserts/updates. It stores a copy of one or more columns sorted but structures the data differently to allow faster access.
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Why B-tree indexing is used instead of hash based indexing?
Oracle will not read all the index; only the index blocks needed to satisfy the particular query. … That is the index root block, the two leaf blocks, and then another IO to the table to get the actual rows. …
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