What is New in NDB Cluster As part of this work, NDB 8.0.19 introduces two new data node configuration parameters. MaxDiskDataLatency  places a ceiling on the degree of latency permitted for disk access and causes transactions taking longer than this length of time to be aborted.  DiskDataUsingSameDisk  makes it possible to take advantage of housing Disk Data tablespaces on separate disks by increasing the rate at which checkpoints of such tablespaces can be performed. In addition, three new tables in the  ndbinfo  database, also added in NDB 8.0.19 and listed here, provide information about Disk Data performance: 3944 • Memory allocation and TransactionMemory.   NDB 8.0.19 introduces a new  TransactionMemory parameter which simplifies allocation of data node memory for transactions as part of the work done •The  pgman_time_track_stats  table reports on the latency of disk operations relating to Disk Data tablespaces •The  diskstats_1sec  table reports on writes to Disk Data tablespaces for each of the last 20 seconds •The  diskstat  table reports on writes to Disk Data tablespaces during the past second •Protecting disk devices from overload to help ensure low latency under high loads •Balancing checkpoints to disk and in-memory checkpoints against one other, when necessary •Speeding up checkpoints for disk data tablespaces when the redo log or the undo log becomes full •Avoiding bursts of checkpoint disk writes • Disk Data checkpointing improvements.   NDB Cluster 8.0.19 provides a number of new enhancements which help to reduce the latency of checkpoints of Disk Data tables and tablespaces when using non-volatile memory devices such as solid-state drives and the NVMe specification for such devices. These improvements include those in the following list: •The default for  LcpScanProgressTimeout  is increased to 180 seconds. •The default value for  StringMemory  is increased to 25%. •The maximum for  DiskPageBufferMemory  is also increased to 16 terabytes. •The maximum for  DataMemory  is increased to 16 terabytes. • Changes in parameter maxmimums and defaults.   NDB 8.0.19 makes the following changes in configuration parameter maximum and default values: • ndb_autoincrement_prefetch_sz changes.   In NDB 8.0.19, the default value of the ndb_autoincrement_prefetch_sz  server system variable is increased to 512.