Oracle 12.2 and higher: Set _cursor_obsolete_threshold to old default

Sometimes development groups change default parameter settings because it fits well for a specific feature. This has happened with _cursor_obsolete_threshold in Oracle Database 12.2. But there’s now an official recommendation for Oracle 12.2 and higher: Set _cursor_obsolete_threshold to old default. What is _cursor_obsolete_threshold? First of all, this is obviously an underscore parameter. And usually the policy is: Don’t change underscore parameters unless either you clearly understand what you are changing. Or unless Oracle Support (or another Oracle authority) advises you to do. We introduced this parameter in Oracle 11.2.0.3 for an issue of growing child cursors. An enhancement request was…