I am using Oracle 12c Standard Edition Release 220.127.116.11.0. Everything works perfect. But while I was checking the alert log file I saw the following message several times.
An internal routine has requested a dump of selected redo. This usually happens following a specific internal error, when analysis of the redo logs will help Oracle Support with the diagnosis. It is recommended that you retain all the redo logs generated (by all the instances) during the past 12 hours, in case additional redo dumps are required to help with the diagnosis.
Any idea about this? I don't understand what it says so can somebody please help me out?
In response to @MichaelKutz' comment I can confirm that no
ORA-nnn errors occur before or after the entry in the alert log file.