SET @start_global_value = @@global.ROCKSDB_STATS_DUMP_PERIOD_SEC;
SELECT @start_global_value;
@start_global_value
600
"Trying to set variable @@global.ROCKSDB_STATS_DUMP_PERIOD_SEC to 444. It should fail because it is readonly."
SET @@global.ROCKSDB_STATS_DUMP_PERIOD_SEC   = 444;
ERROR HY000: Variable 'rocksdb_stats_dump_period_sec' is a read only variable
