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UI Policies are the same as Client SCRIPTS which governs the FORM and its field behavior. It changes information on a form dynamically and controls flow for TASKS. UI policies are USED to set MANDATORY fields.

IMPERSONATING a USER means a user can temporarily sign in to a network as a different user. If a user has full IMPERSONATION permissions he can impersonate all users of that network and can do anything. This FEATURE of Service now is used in testing and helps other users in TROUBLESHOOTING the problems by logging in to it.

DATA Lookup- It is a drop-down field in a form that references an external data source and allows the USER to LOAD data into the form quickly.

Record Matching- This feature enables the executives to DETERMINE the rules which are being automatically set on single or multiple values of the fields when predefined conditions are met.

ASSUMING the database name of the ServiceType field is "u_servicetype", this should work: VAR gr = new GlideRecord('sys_user');
gr.get(g_user.userID);
var svcType = gr.u_serviceType;

Note that this might have a slight UI delay since gr.get is doing SYNCHRONOUS AJAX call. You can do it asynchronously with a gr.query and a callback function, as:

var gr = new GlideRecord('sys_user');
gr.addQuery('sys_id',g_user.userID);
gr.query(function(user){
if(user.u_servicetype=="CMS"){
   return;
} else {
   // all the rest of your code...
}
});

Configuration Management Database refers to CMDB. CMDB acts as a data warehouse that stores INFORMATION related to all technical services. This information related to each service is stored in a CI (Configuration ITEM)

It is a TYPE of CATALOG item which ALLOWS USERS specifically end-users to create task-based records. The record producer generates records such as incident records instead of the requested items.

HTML Sanitizer helps in removing the UNWANTED code and protects the code against SECURITY factors such as scripting attacks. It WORKS by VALIDATING the built-in WHITE list for markup that one always wants to protect.

PERFORMANCE Analytics is a kind of APPLICATION that allows users to take screenshots of DATA at particular intervals and HELP them to create a series for any KPI.

BSM MAP refers to the Business Service Management map and is USED to display the Configuration ITEMS graphically.

All information RELATED to them one can be found in the parent table for BSM-related tables i.e. cmdb_ci.

They are USED to record and measure the PATH of individual records. It increases the effectiveness of the IT MANAGEMENT process.

Example- A metric can measure the incident RESOLUTION by measuring the time to RESOLVE that incident.

• Global text SEARCH- Used to FIND records in MULTIPLE tables.
• Navigation FILTER- Used to filter the items in the navigator of the application.
• Search Screens- It is used to search for records in a table.
• Knowledge base- Used to find knowledge ARTICLES.

A GAUGE is a kind of a WIDGET that is based on a REPORT and can be put on content or homepage. These are used to contain graphical content in ServiceNow.