A binary tarball installation gives you full control over the MySQL directory and version. Unlike a distribution package, it does not automatically create the system user, configure permissions, install a service, or apply security updates.
When a Linux filesystem fills unexpectedly, first identify whether the space belongs to large files, large directory trees, logs, caches, containers, or files that were deleted but remain open by a process.
Production Java processes should normally be managed by systemd, a container orchestrator, or another supervisor. Searching ps output and killing a matched PID is fragile: it can select the grep process, match multiple applications, or start a duplicate instance.
Install MongoDB from the official repository for your distribution whenever possible. Repository packages provide service files, upgrades, and dependency management.