MySQL 9.1 Release Notes
At startup, InnoDB scans directories defined by
the innodb_directories variable
for tablespace files. The paths of discovered tablespace files are
validated against the paths recorded in the data dictionary. If
the paths do not match, the paths in the data dictionary are
updated.
The
innodb_validate_tablespace_paths
variable permits disabling tablespace path validation. This
feature is intended for environments where tablespaces files are
not moved. Disabling path validation improves startup time on
systems with a large number of tablespace files. If
log_error_verbosity is set to 3,
the following message is printed at startup when tablespace path
validation is disabled:
[InnoDB] Skipping InnoDB tablespace path validation.
Manually moved tablespace files will not be detected!
Warning
Starting the server with tablespace path validation disabled after moving tablespace files can lead to undefined behavior.