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