MySQL  NDB Cluster  is a high-availability, high-redundancy version of MySQL adapted for the distributed computing environment. The most recent NDB Cluster release series uses version 8 of the  NDB  storage engine (also known as  NDBCLUSTER ) to enable running several computers with MySQL servers and other software in a cluster. NDB Cluster 8.0, now available as a General Availability (GA) release beginning with version 8.0.19, incorporates version 8.0 of the  NDB  storage engine. NDB Cluster 7.6 and NDB Cluster 7.5, still available as GA releases, use versions 7.6 and 7.5 of  NDB , respectively. Previous GA releases still available for use in production, NDB Cluster 7.4 and NDB Cluster 7.3, incorporate  NDB  versions 7.4 and 7.3, respectively.  NDB 7.2 and older release series are no longer supported or maintained . Support for the  NDB  storage engine is not included in standard MySQL Server 8.0 binaries built by Oracle. Instead, users of NDB Cluster binaries from Oracle should upgrade to the most recent binary release of NDB Cluster for supported platforms—these include RPMs that should work with most Linux distributions. NDB Cluster 8.0 users who build from source should use the sources provided for MySQL 8.0 and build 3922 23.4.25 ndb_select_count — Print Row Counts for NDB Tables .............................................. 4406 23.4.26 ndb_setup.py — Start browser-based Auto-Installer for NDB Cluster (DEPRECATED) .. 4410 23.4.27 ndb_show_tables — Display List of NDB Tables ........................................................ 4414 23.4.28 ndb_size.pl — NDBCLUSTER Size Requirement Estimator ........................................ 4419 23.4.29 ndb_top — View CPU usage information for NDB threads .......................................... 4422 23.4.30 ndb_waiter — Wait for NDB Cluster to Reach a Given Status ..................................... 4428 23.4.31 ndbxfrm — Compress, Decompress, Encrypt, and Decrypt Files Created by NDB Cluster .................................................................................................................................. 4434 23.5 Management of NDB Cluster ................................................................................................. 4438 23.5.1 Commands in the NDB Cluster Management Client ..................................................... 4439 23.5.2 NDB Cluster Log Messages ........................................................................................ 4444 23.5.3 Event Reports Generated in NDB Cluster .................................................................... 4463 23.5.4 Summary of NDB Cluster Start Phases ....................................................................... 4475 23.5.5 Performing a Rolling Restart of an NDB Cluster ........................................................... 4476 23.5.6 NDB Cluster Single User Mode ................................................................................... 4478 23.5.7 Adding NDB Cluster Data Nodes Online ...................................................................... 4479 23.5.8 Online Backup of NDB Cluster .................................................................................... 4490 23.5.9 MySQL Server Usage for NDB Cluster ........................................................................ 4496 23.5.10 NDB Cluster Disk Data Tables .................................................................................. 4498 23.5.11 Online Operations with ALTER TABLE in NDB Cluster ............................................... 4504 23.5.12 Distributed MySQL Privileges with NDB_STORED_USER .......................................... 4507 23.5.13 NDB API Statistics Counters and Variables ............................................................... 4508 23.5.14 ndbinfo: The NDB Cluster Information Database ........................................................ 4520 23.5.15 INFORMATION_SCHEMA Tables for NDB Cluster ..................................................... 4594 23.5.16 Quick Reference: NDB Cluster SQL Statements ........................................................ 4594 23.5.17 NDB Cluster Security Issues ..................................................................................... 4601 23.6 NDB Cluster Replication ........................................................................................................ 4609 23.6.1 NDB Cluster Replication: Abbreviations and Symbols ................................................... 4610 23.6.2 General Requirements for NDB Cluster Replication ...................................................... 4611 23.6.3 Known Issues in NDB Cluster Replication ................................................................... 4612 23.6.4 NDB Cluster Replication Schema and Tables .............................................................. 4618 23.6.5 Preparing the NDB Cluster for Replication ................................................................... 4623 23.6.6 Starting NDB Cluster Replication (Single Replication Channel) ...................................... 4625 23.6.7 Using Two Replication Channels for NDB Cluster Replication ....................................... 4627 23.6.8 Implementing Failover with NDB Cluster Replication .................................................... 4628 23.6.9 NDB Cluster Backups With NDB Cluster Replication .................................................... 4630 23.6.10 NDB Cluster Replication: Bidrectional and Circular Replication .................................... 4637 23.6.11 NDB Cluster Replication Conflict Resolution .............................................................. 4641 23.7 NDB Cluster Release Notes .................................................................................................. 4654