The default JVM driver has a default 500MB maximum heap size. As a best practice, increase this value to 10GB when using the Generic JDBC connector due to the increased workload experiences by the driver node. You can change the value by setting the Teradata Fabric system property driverMaxHeapSizeMB to 10000 (10GB) and restarting the tdqg-node service. Heap usage increases with the number of concurrent queries.