You cannot run these on a standard OFW (Official Firmware) PS3. They require a jailbroken console (CFW or HEN) because they access low-level system calls that Sony locked down.
This is the most critical section. The PS3 homebrew scene has many abandoned websites, sketchy ad-laden download links, and malicious fake PKGs that can brick your console or install ransomware. download rebuild database ps3 pkg
Rebuilding the database is a non-destructive process for your main data. It focuses on refreshing the system's internal registry. You cannot run these on a standard OFW