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Index scan switched to full table scan

edited Aug 27, 2015 10:22AM in SQL Performance (MOSC) 15 commentsAnswered

We have Oracle 10.2.0.4.0 and a table with 212.000 rows. A table has 8 indexes. Normaly transactions use index scan, but suddenly the access is changed to full table scan - and the system slows down. The solution is to recompute statistics for this table and access by index is back in use. We don't use automatic statistics update. How can we prevent such unpleasant events?

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