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InnoDB 1.1 for MySQL 5.5 User's Guide
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InnoDB 1.1 for MySQL 5.5 User's Guide  /  Fast Index Creation in the InnoDB Storage Engine

Chapter 2. Fast Index Creation in the InnoDB Storage Engine

In MySQL 5.5 and higher, or in MySQL 5.1 with the InnoDB Plugin, creating and dropping secondary indexes does not copy the contents of the entire table, making this operation much more efficient than with prior releases.


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