"Data partitions are subsets of the database with restricted access to data records. Restrict access by defining a set of constraints for each data partition. Assign these data partitions to access types. The data partition assignment determines the records that the contact can access." CA Wiki
Example Syntax, to use on default, view, create, pre-update, delete :
Allowing ticket creation for contacts that don't have a certain string of characters in their last name
Warning: See comment jmayer
Allowing only the viewing of tickets where the organization is like
Allowing only the viewing of tickets where the organization in list
Improved by Giedrius
Data Partitions - CA Service Management - 14.1 - CA Technologies Documentation
Search "Data Partitions" Results - CA Service Management - 14.1 - CA Technologies Documentation
Data Partition Constraints and Controlled Table - CA Service Management - 14.1 - CA Technologies Documentation
How to Set Up the Data Partition - CA Service Management - 14.1 - CA Technologies Documentation
TEC1960413 - Error while setting a default Data Partition “Data partition default "0" for attribute priority is incorrect value type string; expecting type integer”
TEC478763 - How do we use a "Defaults" data partition constraint to set a group?
TEC1982813 - "AHD05237:An internal error with surveys occurred" and "AHD03055:Data partition Create restriction on Survey" in multi-tenanted environment
http://www.servicedeskusers.com/Data_Partitions.