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**Modify a parameter in a parameter group** The following ``modify-cluster-parameter-group`` example modifies the *wlm_json_configuration* parameter for workload management. It accepts the parameters from a file that contains the JSON contents shown below. :: aws redshift modify-cluster-parameter-group \ --parameter-group-name myclusterparametergroup \ --parameters file://modify_pg.json Contents of ``modify_pg.json``:: [ { "ParameterName": "wlm_json_configuration", "ParameterValue": "[{\"user_group\":\"example_user_group1\",\"query_group\": \"example_query_group1\", \"query_concurrency\":7},{\"query_concurrency\":5}]" } ] Output:: { "ParameterGroupStatus": "Your parameter group has been updated but changes won't get applied until you reboot the associated Clusters.", "ParameterGroupName": "myclusterparametergroup", "ResponseMetadata": { "RequestId": "09974cc0-64cd-11e2-bea9-49e0ce183f07" } }