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