At 10:09 AM 10/1/2003, you wrote:
Joan, what is the difference in the plans? What specific feature made the difference? Are the values of optimizer_index_cost_adj and optimizer_index_caching same on both versions? How about histograms? What is with db_file_multiblock_read_count,sort_area_size and hash_area_size? Is everything same as in 8i? May be setting of those parameters can be tweaked to your benefit?
On Wed, 2003-10-01 at 11:54, Joan Hsieh wrote: > Kirti, > > I had upgraded a database from 8.1.7.4 to 9.2.0.4. Before the upgrade, > performance is good. After upgrade, one query run time from 2 min to 12 > hours. Of course, I re-analyzed all tables and indexes. The explain plan > changed from hash join to nested-loop. All the parameters are same. So I > have to put optimized_feature_enable=8.1.7 to make run normal as usual. > I hate to disable the new feature, but no choose.
Wolfgang Breitling
Oracle7, 8, 8i, 9i OCP DBA
Centrex Consulting Corporation
http://www.centrexcc.com
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