Anybody more familiar with "_use_old_connect_by" than I am?

Hello,

anybody have used the setting "_use_old_connect_by" ? We had to use it (instance level) in our migrated 9.2.0.7 to 10.2.0.2database (win32) because certain hierarchical queries were chewing up all
the cpu. After we set "_use_old_connect_by" to TRUE, cpu usage went back to normal. This suggestion was made by the metalink support analyst as one of many attempts to fix the cpu problem which almost brought down the oracle server.
Appearantly it influences the execution of connect-by queries in 10g. But since Metalink doesn't have much on this setting I am not sure which unwanted side effects to expect (eg, wrong resultsets, influence on other type of queries, other bugs)

Kind regards,
Andre v Winssen

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