RE: _gby_hash_aggregation_enabled=false

When you set it, did it stop the query from using HASH GROUP BY?  

If you don't mind, could you please check and see what you get from the following query:  

select count(distinct plan_hash_value) from v$sql_plan where operation = 'HASH' and options = 'GROUP BY';  

Thanks,
Brandon

From: Taylor, Chris David [mailto:Chris.Taylor_at_ingrambarge.com]

Well I was going to say we had set it and have not experienced any problems.  

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