Checkpoints and wals, fantastic beasts (and where to find them)
Back in the days of when I was an Oracle DBA I had to solve a strange behaviour on an Oracle installation. The system for some reasons stopped accepting the writes occasionally and without an apparent reason.
This behaviour appeared odd to anybody except for my team, which addressed the issue immediately. The problem was caused by a not optimal configuration on the Oracle instance.
This thought led me to writing this post.