MySQL Cluster Tutorial - cdn.oreillystatic.com
MySQL Cluster Tutorial - cdn.oreillystatic.com
MySQL Cluster Tutorial - cdn.oreillystatic.com
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mcm> show status --process mycluster;<br />
+------+----------+--------------+---------+-----------+<br />
| Id | Process | Host | Status | Nodegroup |<br />
+------+----------+--------------+---------+-----------+<br />
| 1 | ndb_mgmd | 192.168.0.10 | running | |<br />
| 2 | ndb_mgmd | 192.168.0.11 | running | |<br />
| 3 | ndbd | 192.168.0.12 | running | 0 |<br />
| 4 | ndbd | 192.168.0.13 | running | 0 |<br />
| 5 | ndbd | 192.168.0.12 | running | 1 |<br />
| 6 | ndbd | 192.168.0.13 | running | 1 |<br />
| 7 | mysqld | 192.168.0.10 | running | |<br />
| 8 | mysqld | 192.168.0.11 | running | |<br />
+------+----------+--------------+---------+-----------+<br />
Checking and setting <strong>MySQL</strong> <strong>Cluster</strong> parameters<br />
When using <strong>MySQL</strong> <strong>Cluster</strong> Manager, the administrator reviews and changes all<br />
configuration parameters using the get and set <strong>com</strong>mands rather than editing the<br />
configuration files directly. For both get and set you can control the scope of the attributes<br />
being read or updated. For example, you can specify that the attribute applies to all nodes,<br />
all nodes of a particular class (such as all data nodes) or to a specific node. Additionally,<br />
when reading attributes you can provide a specific attribute name or ask for all applicable<br />
attributes as well as indicating whether you wish to see the attributes still with their default<br />
values or just those that have been overwritten.<br />
There follow some examples of getting and setting attributes.<br />
1. Fetch all parameters that apply to all data nodes, including defaults<br />
mcm> get -d :ndbd mycluster;<br />
+-----------------------+-------+----------+------+----------+------+---------+----------+<br />
| Name | Value | Process1 | Id1 | Process2 | Id2 | Level | Comment |<br />
+-----------------------+-------+----------+------+----------+------+---------+----------+<br />
| __ndbmt_lqh_threads | NULL | ndbd | 3 | | | Default | |<br />
| __ndbmt_lqh_workers | NULL | ndbd | 3 | | | Default | |<br />
| Arbitration | NULL | ndbd | 3 | | | Default | |<br />
........ : : : : : : : :<br />
| __ndbmt_lqh_threads | NULL | ndbd | 4 | | | Default | |<br />
| __ndbmt_lqh_workers | NULL | ndbd | 4 | | | Default | |<br />
| Arbitration | NULL | ndbd | 4 | | | Default | |<br />
| ArbitrationTimeout | 3000 | ndbd | 4 | | | Default | |<br />
........ : : : : : : : :<br />
| __ndbmt_lqh_threads | NULL | ndbd | 5 | | | Default | |<br />
........ : : : : : : : :<br />
| __ndbmt_lqh_threads | NULL | ndbd | 6 | | | Default | |<br />
........ : : : : : : : :<br />
+-----------------------+-------+----------+------+----------+------+---------+----------+<br />
2. Fetch the values of parameters (excluding defaults) for mysqld with ID=7:<br />
mcm> get :mysqld:7 mycluster;<br />
+------------+--------------------------------------------------+----------+------+-...<br />
| Name | Value | Process1 | Id1 |<br />
+------------+--------------------------------------------------+----------+------+-...<br />
| datadir | /usr/local/mcm/manager/clusters/mycluster/7/data | mysqld | 7 | ...<br />
| HostName | ws1 | mysqld | 7 | ...<br />
| ndb-nodeid | 7 | mysqld | 7 | ...<br />
| ndbcluster | | mysqld | 7 | ...<br />
| NodeId | 7 | mysqld | 7 | ...<br />
+------------+--------------------------------------------------+----------+------+-...<br />
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