Checking which records will be captured within an Update Set

For an update to be captured within sys_update_xml and thus be captured with an Update Set, the corresponding table must have the update_synch=true attribute.

To locate which tables have this attribute in a fresh instance:

1. Navigate to the sys_dictionary table.
2. Personalize the list to include the Attributes column.
3. Filter on Attributes is update_synch=true. 

This will reveal approximately 300 tables, depending on the platform version, which have the update_synch=true attribute. If the table is not listed for the update , then the update will not be properly recorded within sys_update_xml or subsequently within the intended Update Set. 

Note: ServiceNow does not recommended to add the update_synch=true attribute to any table that does not have it Out-of-box (OOB). Doing so can cause false updates to inundate the sys_update_xml table and in time will result in the inability to install plugins, commit Update Sets, and will cause unintended performance degradation issues.