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.
To change the value of MIRROR, run onutil SET MIRROR 1 PERSISTENT with the server in quiescent or on-line mode.
Alternatively, you can edit the ONCONFIG file with a text editor while the database server is off-line. After you change the ONCONFIG file, initialize shared memory (take the database server to quiescent mode or on-line mode) for the change to take effect.
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