Could you please send the explain plans for each statement, the value of db_file_multiblock_read_count and the following columns related to tables, columns and indexes (user_tables.blocks, user_tables.num_rows, user_indexes.blevel, user_indexes.leaf_blocks, user_indexes.distinct_keys, user_indexes.clustering_factor, user_tab_columns.density for each column in the index).
-- Daniel W. Fink http://www.optimaldba.com
Craig Healey wrote:
OK, I'm confused. Maybe it's Monday morning and my brain's not working.
We have a production schema and a test schema on the same Oracle 8.1.7
instance, running on Windows. They both have a customer table, with 3
million and 2 million records respectively. They both have the same
indexes, and both have been analyzed today. Production used an index and
took 40ms. Test didn't and took 20s. I played around, analyzing,
dropping and creating indexes etc. Now neither of them use the index,
both taking around 20s. I can add a hint, which works, but I want to know what changed.
TIA
Craig Healey
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