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The DataSync Agent supports excluding columns from replication. Configuring columns to be excluded should be done prior to the Agent creating the table, which contains the excluded column for clarity. However, it can be done after with no ill affect. That column will no longer be populated.

You can configure multiple columns to be excluded. To set this up you will have one <exclude_columns>…</exclude_columns> set of tags. Within the tag, you will define each column to be excluded by individual <exclude_column>…</exclude_column> tags. This will be placed within the <subscribe> element located in the agent.xml configuration file.

 NOTE: The preferred approach for excluding columns from being replicated is to leverage capabilities of the producer, such as Perspectium Views, which provides the ability to define which columns should be replicated.

In the example below, the necessary configuration is added to exclude the columns:

• fx_price

• sys_tags

• sys_translated_text

Currently, when a column is excluded, it is applied to every table which may contain the column.

Example of agent.xml

<?xml version="1.0" encoding="ISO-8859-1" standalone="no"?>
<config>
    <agent>
        <subscribe>
     	    <task>
                <task_name>example_subscribe</task_name>
                <message_connection>amqps://example.perspectium.net</message_connection>
                .
                .
                .
            </task>
 
            <exclude_columns>
                <exclude_column>sys_translated_text</exclude_column>
                <exclude_column>fx_price</exclude_column>
                <exclude_column>sys_tags</exclude_column>
            </exclude_columns>
 
        </subscribe>
 
        <max_reads_per_connect>4000</max_reads_per_connect>
        <polling_interval>5</polling_interval>
    </agent>
</config>