SET @start_global_value = @@global.ROCKSDB_NO_BLOCK_CACHE;
SELECT @start_global_value;
@start_global_value
0
"Trying to set variable @@global.ROCKSDB_NO_BLOCK_CACHE to 444. It should fail because it is readonly."
SET @@global.ROCKSDB_NO_BLOCK_CACHE   = 444;
ERROR HY000: Variable 'rocksdb_no_block_cache' is a read only variable