Example 2-3 shows the use of the ESTIMATE_ONLY parameter to estimate the space that would be consumed in a table-mode export, without actually performing the export operation. Issue the following command to use the BLOCKS method to estimate the number of bytes required to export the data in the following three tables located in the human resource (hr) schema: employees, departments, and locations.
The estimate is printed in the log file and displayed on the client's standard output device. The estimate is for table row data only; it does not include metadata.