essbase.cfg is a configuration file.
With the essbase.cfg configuration file, you can customize your Essbase Server configuration. Settings specified in the essbase.cfg file usually apply to the entire Essbase Server. These settings override the Essbase defaults and apply to all databases within all applications on the Essbase Server.
You can create one essbase.cfg file for server settings, and another for client settings. Assume settings are for the server unless otherwise noted.
You cannot reject more records than the error log can hold. By default, the limit is 1000. You can change the limit by setting DATAERRORLIMIT. See Essbase - Loading a Subset of Records from a Data Source