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I have recently encountered an issue where after running a COLLECT STATS statement on a table, the statistics displayed in the HELP STATS results aren't updating. I found that if I DROP STATS on the index or column and then re-collect stats, it will correctly display.

Collected statistics are a valuable source of information in Teradata, not only for the optimizer, but also for developers or DBAs. Spotting outdated statistics (which might lead to bad optimizer plans) and implementing/monitoring a stats recollection process are common tasks, which need the current statistics as input.