On 07/12/2006 05:02:04 AM, Alex Gorbachev wrote: > And this is called "upgraded smoothly"? ;-) With new versions, there is no such thing as a "smooth upgrade". CBO is the principal culprit. > There is no silver bullet and as Allen mentioned "Method R" might be > your friend but you need some time to get into it and actually some > time to use it. But its results would be most probably the best. ;-) Actually, there is a bullet with a rather high percentage of silver: setting optimizer_index_* & first_rows_n parameters. That will get you session wide emulation of RBO. As for the system statistics, running 10g without it is a felony. They should make a constitutional amendment baning that. -- Mladen Gogala http://www.mgogala.com -- //www.freelists.org/webpage/oracle-l