Domain separation training

Service NowDomain Separation

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Agenda◦ What is Domain Separation?◦ Domain Hierarchy◦ Record Segregation◦ Process Flow◦ Data Flow◦ Best Practices◦ Requirements for use◦ Important Information


Allows multiple organizations to share one instance leveraging global properties and global processes across the entire instance◦ Allows each organization to segregate data within the single instance

Mainly used by Managed Service providers (MSPs) to host smaller customers◦ Lowers the cost of using ServiceNow◦ Centralizes instance administration◦ Accommodates instance upgrades

Technical Information◦ Domain Separation is the implementation of domains within a single ServiceNow

instance◦ A domain is a unique qualifier used within a single instance to separate data and

processes while still sharing global properties and global processes across the entire instance


What is Domain Separation?

Parent and child relationships are created by the domain hierarchy


Domain Hierarchy

1 ServiceNow Instance (1 Database, 1 Schema)


Record Segregation

Instance


Process Flow


Data Flow


Best Practices

If the table is a base instance table do not change its domain status.◦ Exception to user created tables. These tables will need to be domain separated

due to them usually being data tables.

Just because a table has the sys_domain field does not mean its records should be domain separated.◦ Example: All workflows should be developed as global using conditions to

determine when workflows should execute.

For better performance client scripts should be used as little as possible.◦ Display Business rules should be used where possible

Limit synchronous calls as much as possible◦ Better: GlideRecord and getRefrence should be used with a callback option◦ Best: Replace GlideRecord and getRefrence with GlideAjax calls to return less data


Best Practices

Always use ServiceNow coding standards◦ Never overwrite base instance process, override it where needed

The sys_overrides field indicates that a policy, application, or module at a lower level in the hierarchy overrides a record at a higher level

Once a child domain overrides a parent process the new child process runs for itself and all of its child domains

◦ Do not overwrite base instance classes, extend them when needed

You cannot override and set Active = False◦ The system will ignore the override because it is inactive◦ To override and deactivate:

Set a condition of false or sys_id | is | empty

Tables that extend from a domain separated table will not have the sys_domain on them, the base table sys_domain field value is used◦ Exception: Inbound Actions are extended from a domain separated table but

cannot be domain separated


Best Practices

Always update choice lists in DEV in the global domain◦ If you change a choice state in PROD and then capture an update in DEV, all

choice states in PROD will be overwritten

When troubleshooting lists consider there are multiple views◦ Personal◦ Global◦ Domain specific

When troubleshooting forms consider there are multiple views◦ Global◦ Domain specific

When creating applications and tables consider if a sys_domain field is needed for separation


Requirements For Use


When Not To Use

An existing instance can become domain-separated technically but is NOT recommended. You should start with a new instance.

A domain-separated instance has a control for converting data back to a non-domain-separated instance however this is NOT recommended. You should start with a new instance.

The Domain Separation plugin must be activated through a ServiceNow Technical Support request


Important information

Contender Solutions is a ServiceNow partner, providing expert services in the ServiceNow platform space. If you’re looking to stand up ServiceNow for the first time, upgrade to the

latest version, or add functionality to an existing instance, we can help.

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right people, skills and a solution.


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Domain separation training