SET @start_global_value = @@global.ROCKSDB_DELETE_OBSOLETE_FILES_PERIOD_MICROS;
SELECT @start_global_value;
@start_global_value
21600000000
"Trying to set variable @@global.ROCKSDB_DELETE_OBSOLETE_FILES_PERIOD_MICROS to 444. It should fail because it is readonly."
SET @@global.ROCKSDB_DELETE_OBSOLETE_FILES_PERIOD_MICROS   = 444;
ERROR HY000: Variable 'rocksdb_delete_obsolete_files_period_micros' is a read only variable
