In ServiceNow’sConfiguration Management Database (CMDB), threekey tablesform the foundation for storing and managingConfiguration Items (CIs)and theirrelationships.

cmdb_ci (E) - CI Base Class Table

This is thebase classfor allConfiguration Items (CIs)in the CMDB.

Every CI (e.g., servers, applications, network devices) extends from this table.

Stores general attributes like name, serial number, and asset tag.

cmdb (G) - CMDB Parent Table

This is theparent tablefor all CMDB-related tables.

Itdoes not store CI records directlybut serves as a reference structure.

All CMDB tables, includingcmdb_ci, inherit from this table.

cmdb_rel_ci (C) - CMDB Relationship Table

This tablestores relationshipsbetween different CIs.

Example: Aserver hosts an application, or adatabase is dependent on a storage unit.

Helps withimpact analysis and dependency mapping.

A. sn_cmdt_bak

No such table in standard ServiceNow CMDB.

B. sh_emdb_ci

Typo or incorrect table name—not part of the ServiceNow CMDB model.

D. cmdb_bak

"bak" suggests abackup table, but there isno standard "cmdb_bak"in ServiceNow.

F. sh_eomdb

Not a recognized CMDB table in ServiceNow.