ORA-01623 & ORA-00312 while dropping one red log file

I got the following errors while dropping one redo log group: Please note that our database is an RAC One Node database that I'm trying to convert to Single-Instance database based on the client requirements.So, thread 2 (instance 2), is not there actually.If we query about the redo log files of instance 2: So, what … Continue reading ORA-01623 & ORA-00312 while dropping one red log file

VBoxClient: Could not find symbol address

Problem Description: While one of my VirtualBox machines was running, a power crash happened and I had to restart my laptop.After restarting the laptop, I started that virtual machine again, it started, but I got the following errors, and I was not able to access the machine from VirtualBox (seems to be hang), but I … Continue reading VBoxClient: Could not find symbol address