Enable the MIRROR configuration parameter

Enabling mirroring starts the database server functions required for mirroring tasks. However, when you enable mirroring, you do not initiate the mirroring process. Mirroring does not actually start until you create mirror chunks for a dbspace, blobspace, or sbspace. See Using mirroring.

Enable mirroring when you initialize the database server if you plan to create a mirror for the root dbspace as part of initialization; otherwise, leave mirroring disabled. If you later decide to mirror a storage space, you can change the value of the MIRROR configuration parameter.

To enable mirroring for the database server, you must set the MIRROR parameter in onconfig to 1. The default value of MIRROR is 0, indicating that mirroring is disabled.

Do not set the MIRROR parameter to 1 if you are not using mirroring.

To change the value of MIRROR, you can edit the onconfig file with a text editor while the database server is in online mode. After you change the onconfig file, take the database server offline and then to quiescent for the change to take effect.