I would guess that the majority of instances I've had to manage in my career were those that I didn't initially install and configure. I've inherited more instances than I would bother to count, and I often need to double-check what's been done in the past. As noted in the series on new jobs from Tracy and Josephine, there are a lot of settings to check and adjust to meet your standards. While backups are often my first priority, security is second. I usually want to know who the sysadmins are and ensure systems are patched and configured to reduce the attack surface area. There is one other security check that I think I haven't always been overly concerned about checking: password expiration.
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