The NDB Cluster Auto-Installer (No longer supported) Figure 23.16 NDB Cluster Auto-Installer Define Processes dialog This screen contains a process tree showing cluster hosts and processes set up to run on each one, as well as a panel which displays information about the item currently selected in the tree. When this screen is accessed for the first time for a given cluster, a default set of processes is defined for you, based on the number of hosts. If you later return to the  Define Hosts  screen, remove all hosts, and add new hosts, this also causes a new default set of processes to be defined. NDB Cluster processes are of the types described in this list: • Management node.   Performs administrative tasks such as stopping individual data nodes, querying node and cluster status, and making backups. Executable:  ndb_mgmd . • Single-threaded data node.   Stores data and executes queries. Executable:  ndbd . • Multi threaded data node.   Stores data and executes queries with multiple worker threads executing in parallel. Executable:  ndbmtd . • SQL node.   MySQL server for executing SQL queries against  NDB . Executable:  mysqld . • API node.   A client accessing data in  NDB  by means of the NDB API or other low-level client API, rather than by using SQL. See MySQL NDB Cluster API Developer Guide, for more information. For more information about process (node) types, see Section 23.1.1, “NDB Cluster Core Concepts” . Processes shown in the tree are numbered sequentially by type, for each host—for example,  SQL node 1 ,  SQL node 2 , and so on—to simplify identification. Each management node, data node, or SQL process must be assigned to a specific host, and is not allowed to run on any other host. An API node  may  be assigned to a single host, but this is not required. Instead, you can assign it to the special  Any host  entry which the tree also contains in addition to any 4021