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When troubleshooting performance issues on tables with a high number of indexes, the db2advis tool kind of falls flat. What we have done to get around this is to restore a backup of the database in question, drop all indexes, and then run the db2advis tool to get the best possible index for the query or queries in question. It would be really nice if the db2advis tool could have a flag which basically ignores any existing indexes to get the best possible index for the workload in question.
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