Oracle 5.0, Справочное руководство

Страница: 1640 / 3232

ndbd
— The MySQL Cluster Data Node Daemon
1620
Permitted Values
Type
boolean
Default
FALSE
Instructs
ndbd
to perform an initial start. An initial start erases any files created for recovery
purposes by earlier instances of
ndbd
. It also re-creates recovery log files. Note that on some
operating systems this process can take a substantial amount of time.
An
--initial
start is to be used only when starting the
ndbd
process under very special
circumstances; this is because this option causes all files to be removed from the Cluster file system
and all redo log files to be re-created. These circumstances are listed here:
• When performing a software upgrade which has changed the contents of any files.
• When restarting the node with a new version of
ndbd
.
• As a measure of last resort when for some reason the node restart or system restart repeatedly
fails. In this case, be aware that this node can no longer be used to restore data due to the
destruction of the data files.
Use of this option prevents the
StartPartialTimeout
and
StartPartitionedTimeout
configuration parameters from having any effect.
Important
This option does not affect any backup files that have already been created
by the affected node.
This option also has no effect on recovery of data by a data node that is just
starting (or restarting) from data nodes that are already running. This recovery
of data occurs automatically, and requires no user intervention in a MySQL
Cluster that is running normally.
It is permissible to use this option when starting the cluster for the very first time (that is, before any
data node files have been created); however, it is not necessary to do so.
•
--initial-start
Version Introduced 5.0.21
Command-Line Format
--initial-start
Permitted Values
Type
boolean
Default
FALSE
This option is used when performing a partial initial start of the cluster. Each node should be started
with this option, as well as
--nowait-nodes
[1620] .
Suppose that you have a 4-node cluster whose data nodes have the IDs 2, 3, 4, and 5, and you wish
to perform a partial initial start using only nodes 2, 4, and 5—that is, omitting node 3:
shell> ndbd --ndb-nodeid=2 --nowait-nodes=3 --initial-start
shell> ndbd --ndb-nodeid=4 --nowait-nodes=3 --initial-start
shell> ndbd --ndb-nodeid=5 --nowait-nodes=3 --initial-start
This option was added in MySQL 5.0.21.
•
--nowait-nodes=node_id_1[, node_id_2[, ...]]