TheConfiguration Management Database (CMDB)in ServiceNow is a core component of IT Service Management (ITSM), allowing organizations to track Configuration Items (CIs) and their relationships. There are threekey tablesthat form the foundation of the CMDB:
cmdb (Base CMDB Table):
This is the parent table for all Configuration Items (CIs) in the CMDB.
It contains the foundational structure upon which all other CMDB-related tables are built.
It does not store CI records itself but serves as the primary reference table.
cmdb_ci (CI Base Class Table):
This is thebase classfor all Configuration Items (CIs).
All specific CI classes (such as servers, applications, networks) extend from this table.
It holds general CI attributes that are common across all CI types.
cmdb_rel_ci (CMDB Relationship Table):
This table defines relationships between different Configuration Items.
It stores dependencies and associations between CIs, such as a server hosting an application.
Relationships are critical for impact analysis and dependency mapping.
B. sn_cmdb_bak & E. cmdb_bak:
These tables donotexist in the standard CMDB schema. They may be mistaken for potential backup tables, but they are not official CMDB tables.
D. sn_cmdb & G. sn_cmdb_ci:
Prefix"sn_"generally indicatesScoped Application Tablesin ServiceNow.
Standard CMDB tables exist in theglobal scopewithout the "sn_" prefix.
"sn_cmdb" and "sn_cmdb_ci" arenotkey tables in theglobal CMDB architecture.
[References:Official ServiceNowCSA (Certified System Administrator) Training Documentation, ServiceNow Product Documentation:CMDB Tables and Relationships, ServiceNowCMDB Overview and Best Practices:CMDB Guide, , , ]
