Oracle 5.0 Reference Manual page 2910

(The quotation marks in this example are optional, since there are no spaces in the command string
following the option; in addition, the
-e
is not case-sensitive.)
Either of these commands causes the ndb_mgm, ndb_mgm, and any
gracefully. MySQL servers running as SQL nodes can be stopped using
For more information, see
Section 17.2.5, "Safe Shutdown and Restart of MySQL
B.10.29: What happens to MySQL Cluster data when the MySQL Cluster is shut down?
The data that was held in memory by the cluster's data nodes is written to disk, and is reloaded into
memory the next time that the cluster is started.
B.10.30: Is it a good idea to have more than one management node for a MySQL Cluster?
It can be helpful as a fail-safe. Only one management node controls the cluster at any given time, but
it is possible to configure one management node as primary, and one or more additional management
nodes to take over in the event that the primary management node fails.
See Section 17.3.2, "MySQL Cluster Configuration
Cluster management nodes.
B.10.31: Can I mix different kinds of hardware and operating systems in one MySQL Cluster?
Yes, as long as all machines and operating systems have the same "endianness" (all big-endian or all
little-endian). We are working to overcome this limitation in a future MySQL Cluster release.
It is also possible to use software from different MySQL Cluster releases on different nodes. However,
we support this only as part of a rolling upgrade procedure (see
Restart of a MySQL Cluster").
B.10.32: Can I run two data nodes on a single host? Two SQL nodes?
Yes, it is possible to do this. In the case of multiple data nodes, it is advisable (but not required) for
each node to use a different data directory. If you want to run multiple SQL nodes on one machine,
each instance of
mysqld
one cluster node of a given type per machine is generally not encouraged or supported for production
use.
We also advise against running data nodes and SQL nodes together on the same host, since the
and processes may compete for memory.
mysqld
B.10.33: Can I use host names with MySQL Cluster?
Yes, it is possible to use DNS and DHCP for cluster hosts. However, if your application requires "five
nines" availability, you should use fixed (numeric) IP addresses, since making communication between
Cluster hosts dependent on services such as DNS and DHCP introduces additional potential points of
failure.
B.10.34: How do I handle MySQL users in a MySQL Cluster having multiple MySQL servers?
MySQL user accounts and privileges are not automatically propagated between different MySQL
servers accessing the same MySQL Cluster. Therefore, you must make sure that these are copied
between the SQL nodes yourself. You can do this manually, or automate the task with scripts.
Warning
Do not attempt to work around this issue by converting the MySQL system
tables to use the
engine is supported for these tables.
MySQL 5.0 FAQ: MySQL Cluster
SHUTDOWN
Section 17.5.2, "Commands in the MySQL Cluster Management
must use a different TCP/IP port. However, in MySQL 5.0, running more than
NDBCLUSTER
2890
command, like other management client commands,
ndbd
mysqladmin
Cluster".
Files", for information on how to configure MySQL
Section 17.5.5, "Performing a Rolling
storage engine. Only the
processes to terminate
shutdown.
Client", and
storage
MyISAM
ndbd