Minimum Communication

When you create a replicated table, you can choose to minimize the amount of data that must be communicated to determine conflicts for each changed row in the table by enabling the minimum communication feature.

During an update, Oracle sends the following when you have enabled the minimum communication option:

• Primary key values

• Old values for the modified column group

• Nulls for old values not in the primary key and the modified column group

• Null for new values for all columns not updated

• Actual new values for updated columns

If minimum communication is disabled, then the entire contents of the updated row are sent.