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When you run reorg rebuild on a table, it locks the table for the entire time it takes to rebuild the table and its indexes. This means that you should schedule the reorg rebuild command on a table when users do not need access to the table.
All of the other reorg commands, including reorg rebuild on an index, lock a small number of pages at a time, and use short, independent transactions to perform their work. You can run these commands at any time. The only negative effects might be on systems that are very I/O bound. |
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