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Querying a layer from a Map Service that returns an extremely large response fails and returns the following error message:
"Error performing query operation."
The result set from the query is larger than 64 MB.
The heap size controls the maximum file size that can be sent to and from the GIS server. By default, the application server is set to 256 MB and the SOC maximum is set to 64 MB. If there are services that users query with result sets in excess of 64MB, the maximum SOC heap size must be increased.
http://<Your Server Name>:6080/arcgis/admin