For all the dnodes in a TDengine cluster, the below parameters must be configured exactly the same, any node whose configuration is different from dnodes already in the cluster can't join the cluster.
| 1 | statusInterval | The interval by which dnode reports its status to mnode |
| 2 | timezone | Timezone |
| 3 | locale | System region and encoding |
| 4 | charset | Character set |
| 5 | ttlChangeOnWrite | Whether the ttl expiration time changes with the table modification operation |
## Start Cluster
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@@ -97,7 +98,7 @@ Then, on the first dnode i.e. h1.tdengine.com in our example, use TDengine CLI `
CREATEDNODE"h2.taos.com:6030";
````
This adds the end point of the new dnode (from Step 4) into the end point list of the cluster. In the command "fqdn:port" should be quoted using double quotes. Change `"h2.taos.com:6030"` to the end point of your new dnode.
This adds the end point of the new dnode (from Step 4) into the end point list of the cluster. In the command "fqdn:port" should be quoted using double quotes. Change `"h2.taos.com:6030"` to the end point of your new dnode.
Then on the first dnode h1.tdengine.com, execute `show dnodes` in `taos`
**Description**: The linear regression function of the specified column and the timestamp column (primary key), `start_val` is the initial value and `step_val` is the step value.
**Description**: The linear regression function of a specified column, `start_val` is the initial value and `step_val` is the step value.
**Return value type**: A string in the format of "(slope, intercept)"