Help Center/ Distributed Database Middleware/ User Guide/ Parameter Template Management/ Modifying a Custom Parameter Template
Updated on 2024-07-30 GMT+08:00
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Modifying a Custom Parameter Template

When using DDM instances, you can modify parameters in the parameter template you created as needed.

You cannot change parameter values in default parameter templates.

The following are the key points you should know when using parameters from a parameter template:

  • After you change a parameter value and save the change, the change will take effect only after you apply the parameter template to a DDM instance and manually restart the instance. For details, see Applying a Parameter Template.
  • The time when the modification takes effect is determined by the type of the parameter.
  • Parameters in default parameter templates cannot be modified. You can view these parameters by clicking template names. If a custom parameter template is set incorrectly and causes an instance restart to fail, you can re-configure the custom parameter template based on configurations of the default parameter template.

Procedure

  1. Log in to the DDM console.
  2. In the navigation pane on the left, choose Parameter Templates. On the Custom Templates page, click the name of a parameter template.
  3. On the Parameter Details tab page, modify parameters as required. For details, see Instance Parameters.

    Figure 1 Modifying parameters in a parameter template

    Available operations are as follows:

    • To save the modifications, click Save.
    • To cancel the modifications, click Cancel.
    • To preview your changes, click Preview.

  4. After the parameter values are modified, click Template History to view details.

    • The modifications take effect only after you apply the parameter template to DDM instances. For details, see Applying a Parameter Template.
    • If you have modified certain parameters or collations, you need to manually restart the DDM instance for the modifications to take effect. However, the restart caused by node class changes (if any) does not make these modifications take effect.
    • Modifying parameters may affect access to the DDM instance. Exercise caution when performing this operation.
    • It takes 20s to 60s to have the modifications to take effect.
    • After you modify parameters in a parameter template, some modifications immediately take effect for the DDM instance to which the parameter template applies. Exercise caution when performing this operation.