Follow these links for detailed field type information from the Technical Reference Guide:
Common types
The common field types include:
Alpha, Packed and Signed field types are always enabled.
When a partition is enabled for RDMLX all the Common Field Types are automatically enabled in the partition.
Specialized types
The specialized field types include:
The Specialized Field Types are only available when the partition is RDMLX enabled. These field types must be manually enabled as required.