INDEX SKIP SCAN
Short Description
The INDEX SKIP SCAN allows a composite index to be scanned for values not in the leading edge of the index.
Detailed Description​
INDEX SKIP SCAN allows a composite index to be scanned for values, where the values are not in the column at the leading edge of the index.
Using this method can reduce the number of indexes required to support a range of queries, which in turn can improve insert performance as there are less indexes to maintain.
Further Reading​
- Oracle Magazine - How to read an execution plan
- Oracle Tuning Guide - Explaining and Displaying Execution Plans
- Oracle Tuning Guide - Comparing Execution Plans Tutorial
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