SET @start_global_value = @@global.ROCKSDB_KEEP_LOG_FILE_NUM;
SELECT @start_global_value;
@start_global_value
1000
"Trying to set variable @@global.ROCKSDB_KEEP_LOG_FILE_NUM to 444. It should fail because it is readonly."
SET @@global.ROCKSDB_KEEP_LOG_FILE_NUM   = 444;
ERROR HY000: Variable 'rocksdb_keep_log_file_num' is a read only variable
