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 <div class="chapter">
  <div class="titlepage">
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    <div>
     <h1 class="title">
      <a name="mysql-cluster">
      </a>
      Chapter 25 MySQL NDB Cluster 8.4
     </h1>
    </div>
   </div>
  </div>
  <div class="toc">
   <p>
    <b>
     Table of Contents
    </b>
   </p>
   <dl class="toc">
    <dt>
     <span class="section">
      <a href="mysql-cluster-general-info.html">
       25.1 General Information
      </a>
     </span>
    </dt>
    <dt>
     <span class="section">
      <a href="mysql-cluster-overview.html">
       25.2 NDB Cluster Overview
      </a>
     </span>
    </dt>
    <dd>
     <dl>
      <dt>
       <span class="section">
        <a href="mysql-cluster-basics.html">
         25.2.1 NDB Cluster Core Concepts
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-nodes-groups.html">
         25.2.2 NDB Cluster Nodes, Node Groups, Fragment Replicas, and Partitions
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-overview-requirements.html">
         25.2.3 NDB Cluster Hardware, Software, and Networking Requirements
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-what-is-new.html">
         25.2.4 What is New in MySQL NDB Cluster 8.4
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-added-deprecated-removed.html">
         25.2.5 Options, Variables, and Parameters Added, Deprecated or Removed in NDB
    8.4
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-compared.html">
         25.2.6 MySQL Server Using InnoDB Compared with NDB Cluster
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-limitations.html">
         25.2.7 Known Limitations of NDB Cluster
        </a>
       </span>
      </dt>
     </dl>
    </dd>
    <dt>
     <span class="section">
      <a href="mysql-cluster-installation.html">
       25.3 NDB Cluster Installation
      </a>
     </span>
    </dt>
    <dd>
     <dl>
      <dt>
       <span class="section">
        <a href="mysql-cluster-install-linux.html">
         25.3.1 Installation of NDB Cluster on Linux
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-install-windows.html">
         25.3.2 Installing NDB Cluster on Windows
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-install-configuration.html">
         25.3.3 Initial Configuration of NDB Cluster
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-install-first-start.html">
         25.3.4 Initial Startup of NDB Cluster
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-install-example-data.html">
         25.3.5 NDB Cluster Example with Tables and Data
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-install-shutdown-restart.html">
         25.3.6 Safe Shutdown and Restart of NDB Cluster
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-upgrade-downgrade.html">
         25.3.7 Upgrading and Downgrading NDB Cluster
        </a>
       </span>
      </dt>
     </dl>
    </dd>
    <dt>
     <span class="section">
      <a href="mysql-cluster-configuration.html">
       25.4 Configuration of NDB Cluster
      </a>
     </span>
    </dt>
    <dd>
     <dl>
      <dt>
       <span class="section">
        <a href="mysql-cluster-quick.html">
         25.4.1 Quick Test Setup of NDB Cluster
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-configuration-overview.html">
         25.4.2 Overview of NDB Cluster Configuration Parameters, Options, and Variables
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-config-file.html">
         25.4.3 NDB Cluster Configuration Files
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-interconnects.html">
         25.4.4 Using High-Speed Interconnects with NDB Cluster
        </a>
       </span>
      </dt>
     </dl>
    </dd>
    <dt>
     <span class="section">
      <a href="mysql-cluster-programs.html">
       25.5 NDB Cluster Programs
      </a>
     </span>
    </dt>
    <dd>
     <dl>
      <dt>
       <span class="section">
        <a href="mysql-cluster-programs-ndbd.html">
         25.5.1 ndbd — The NDB Cluster Data Node Daemon
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-programs-ndbinfo-select-all.html">
         25.5.2 ndbinfo_select_all — Select From ndbinfo Tables
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-programs-ndbmtd.html">
         25.5.3 ndbmtd — The NDB Cluster Data Node Daemon (Multi-Threaded)
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-programs-ndb-mgmd.html">
         25.5.4 ndb_mgmd — The NDB Cluster Management Server Daemon
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-programs-ndb-mgm.html">
         25.5.5 ndb_mgm — The NDB Cluster Management Client
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-programs-ndb-blob-tool.html">
         25.5.6 ndb_blob_tool — Check and Repair BLOB and TEXT columns of NDB Cluster
        Tables
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-programs-ndb-config.html">
         25.5.7 ndb_config — Extract NDB Cluster Configuration Information
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-programs-ndb-delete-all.html">
         25.5.8 ndb_delete_all — Delete All Rows from an NDB Table
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-programs-ndb-desc.html">
         25.5.9 ndb_desc — Describe NDB Tables
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-programs-ndb-drop-index.html">
         25.5.10 ndb_drop_index — Drop Index from an NDB Table
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-programs-ndb-drop-table.html">
         25.5.11 ndb_drop_table — Drop an NDB Table
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-programs-ndb-error-reporter.html">
         25.5.12 ndb_error_reporter — NDB Error-Reporting Utility
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-programs-ndb-import.html">
         25.5.13 ndb_import — Import CSV Data Into NDB
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-programs-ndb-index-stat.html">
         25.5.14 ndb_index_stat — NDB Index Statistics Utility
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-programs-ndb-move-data.html">
         25.5.15 ndb_move_data — NDB Data Copy Utility
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-programs-ndb-perror.html">
         25.5.16 ndb_perror — Obtain NDB Error Message Information
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-programs-ndb-print-backup-file.html">
         25.5.17 ndb_print_backup_file — Print NDB Backup File Contents
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-programs-ndb-print-file.html">
         25.5.18 ndb_print_file — Print NDB Disk Data File Contents
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-programs-ndb-print-frag-file.html">
         25.5.19 ndb_print_frag_file — Print NDB Fragment List File Contents
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-programs-ndb-print-schema-file.html">
         25.5.20 ndb_print_schema_file — Print NDB Schema File Contents
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-programs-ndb-print-sys-file.html">
         25.5.21 ndb_print_sys_file — Print NDB System File Contents
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-programs-ndb-redo-log-reader.html">
         25.5.22 ndb_redo_log_reader — Check and Print Content of Cluster Redo Log
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-programs-ndb-restore.html">
         25.5.23 ndb_restore — Restore an NDB Cluster Backup
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-programs-ndb-secretsfile-reader.html">
         25.5.24 ndb_secretsfile_reader — Obtain Key Information from an Encrypted NDB
        Data File
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-programs-ndb-select-all.html">
         25.5.25 ndb_select_all — Print Rows from an NDB Table
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-programs-ndb-select-count.html">
         25.5.26 ndb_select_count — Print Row Counts for NDB Tables
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-programs-ndb-show-tables.html">
         25.5.27 ndb_show_tables — Display List of NDB Tables
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-programs-ndb-sign-keys.html">
         25.5.28 ndb_sign_keys — Create, Sign, and Manage TLS Keys and Certificates for NDB
        Cluster
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-programs-ndb-size-pl.html">
         25.5.29 ndb_size.pl — NDBCLUSTER Size Requirement Estimator
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-programs-ndb-top.html">
         25.5.30 ndb_top — View CPU usage information for NDB threads
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-programs-ndb-waiter.html">
         25.5.31 ndb_waiter — Wait for NDB Cluster to Reach a Given Status
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-programs-ndbxfrm.html">
         25.5.32 ndbxfrm — Compress, Decompress, Encrypt, and Decrypt
Files Created by NDB Cluster
        </a>
       </span>
      </dt>
     </dl>
    </dd>
    <dt>
     <span class="section">
      <a href="mysql-cluster-management.html">
       25.6 Management of NDB Cluster
      </a>
     </span>
    </dt>
    <dd>
     <dl>
      <dt>
       <span class="section">
        <a href="mysql-cluster-mgm-client-commands.html">
         25.6.1 Commands in the NDB Cluster Management Client
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-logs-ndb-messages.html">
         25.6.2 NDB Cluster Log Messages
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-event-reports.html">
         25.6.3 Event Reports Generated in NDB Cluster
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-start-phases.html">
         25.6.4 Summary of NDB Cluster Start Phases
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-rolling-restart.html">
         25.6.5 Performing a Rolling Restart of an NDB Cluster
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-single-user-mode.html">
         25.6.6 NDB Cluster Single User Mode
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-online-add-node.html">
         25.6.7 Adding NDB Cluster Data Nodes Online
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-backup.html">
         25.6.8 Online Backup of NDB Cluster
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-importing-data.html">
         25.6.9 Importing Data Into MySQL Cluster
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-mysqld.html">
         25.6.10 MySQL Server Usage for NDB Cluster
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-disk-data.html">
         25.6.11 NDB Cluster Disk Data Tables
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-online-operations.html">
         25.6.12 Online Operations with ALTER TABLE in NDB Cluster
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-privilege-synchronization.html">
         25.6.13 Privilege Synchronization and NDB_STORED_USER
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-tde.html">
         25.6.14 File System Encryption for NDB Cluster
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-tls.html">
         25.6.15 TLS Link Encryption for NDB Cluster
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-ndb-api-statistics.html">
         25.6.16 NDB API Statistics Counters and Variables
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-ndbinfo.html">
         25.6.17 ndbinfo: The NDB Cluster Information Database
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-information-schema-tables.html">
         25.6.18 INFORMATION_SCHEMA Tables for NDB Cluster
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-ps-tables.html">
         25.6.19 NDB Cluster and the Performance Schema
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-sql-statements.html">
         25.6.20 Quick Reference: NDB Cluster SQL Statements
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-security.html">
         25.6.21 NDB Cluster Security Issues
        </a>
       </span>
      </dt>
     </dl>
    </dd>
    <dt>
     <span class="section">
      <a href="mysql-cluster-replication.html">
       25.7 NDB Cluster Replication
      </a>
     </span>
    </dt>
    <dd>
     <dl>
      <dt>
       <span class="section">
        <a href="mysql-cluster-replication-abbreviations.html">
         25.7.1 NDB Cluster Replication: Abbreviations and Symbols
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-replication-general.html">
         25.7.2 General Requirements for NDB Cluster Replication
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-replication-issues.html">
         25.7.3 Known Issues in NDB Cluster Replication
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-replication-schema.html">
         25.7.4 NDB Cluster Replication Schema and Tables
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-replication-preparation.html">
         25.7.5 Preparing the NDB Cluster for Replication
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-replication-starting.html">
         25.7.6 Starting NDB Cluster Replication (Single Replication Channel)
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-replication-two-channels.html">
         25.7.7 Using Two Replication Channels for NDB Cluster Replication
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-replication-failover.html">
         25.7.8 Implementing Failover with NDB Cluster Replication
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-replication-backups.html">
         25.7.9 NDB Cluster Backups With NDB Cluster Replication
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-replication-multi-source.html">
         25.7.10 NDB Cluster Replication: Bidirectional and Circular Replication
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-replication-mta.html">
         25.7.11 NDB Cluster Replication Using the Multithreaded Applier
        </a>
       </span>
      </dt>
      <dt>
       <span class="section">
        <a href="mysql-cluster-replication-conflict-resolution.html">
         25.7.12 NDB Cluster Replication Conflict Resolution
        </a>
       </span>
      </dt>
     </dl>
    </dd>
    <dt>
     <span class="section">
      <a href="mysql-cluster-news.html">
       25.8 NDB Cluster Release Notes
      </a>
     </span>
    </dt>
   </dl>
  </div>
  <a class="indexterm" name="idm46045124461648">
  </a>
  <a class="indexterm" name="idm46045124460576">
  </a>
  <a class="indexterm" name="idm46045124459088">
  </a>
  <a class="indexterm" name="idm46045124457584">
  </a>
  <p class="ndb-rel-level">
   This chapter provides information about MySQL
   <span class="firstterm">
    NDB Cluster
   </span>
   , a
    high-availability, high-redundancy version of MySQL adapted for the
    distributed computing environment, as well as information specific
    to NDB Cluster 8.4 (NDB 8.4.0), based on version
    8.4 of the NDB storage engine. See
   <a class="xref" href="mysql-cluster-what-is-new.html" title="25.2.4 What is New in MySQL NDB Cluster 8.4">
    Section 25.2.4, “What is New in MySQL NDB Cluster 8.4”
   </a>
   , for information about
    differences in NDB 8.4 as compared to earlier releases. See
   <a class="ulink" href="/doc/refman/8.0/en/mysql-cluster.html" target="_top">
    MySQL NDB Cluster 8.0
   </a>
   for information about NDB
    Cluster 8.0. Both NDB 8.0 and NDB 8.4 are intended for use in
    production environments. NDB Cluster 7.6 and 7.5 are previous GA
    releases still supported in production, although new deployments can
    and should use either of MySQL NDB Cluster 8.0 or 8.4.
  </p>
  <p>
   <span class="emphasis">
    <em>
     NDB Cluster 7.4 and older release series are no longer
    supported or maintained
    </em>
   </span>
   .
  </p>
 </div>
 <br/>
</div>
