ServiceNow Event Management – Event Data Volume, Storage Limits, Retention and Archiving

[SyedBurhanJamil]

Hi Community,

I am researching ServiceNow Event Management to better understand how large volumes of event data are handled, especially in environments receiving thousands or millions of events.

So far, I have verified that raw events are stored in the Event [em_event] table and processed events can generate or update records in the Alert [em_alert] table.

In my test instance, the em_event table is configured with Table Rotation using:

• Duration: 1 Day

• Rotations: 7

I am trying to understand the following points:

1. Is there any documented maximum volume or capacity for Event Management event data?

2. Is there any GB/TB-based storage limit for Event Management or for a ServiceNow instance in general? Is this related to licensing, subscription, or customer-specific storage entitlement?

3. With Table Rotation configured on em_event, how should the actual event retention period be interpreted? For example, with 1-day duration and 7 rotations, should the event data generally be expected to remain available for approximately 7 days?

4. Once the rotation cycle is completed, are older event records automatically purged/reused by the rotation mechanism?

5. Is the em_event table intended primarily for short-term operational event processing rather than long-term historical storage?

6. If an organization needs to retain raw event data for several months or years, what is the recommended ServiceNow approach?

   • Archive to another ServiceNow table?

   • Export to an external SIEM/data warehouse/data lake?

   • Is there another recommended architecture?

The main question I am trying to answer is:

If an organization is receiving thousands or millions of events, how much event data can realistically be retained in ServiceNow, and for how long?

Any official ServiceNow documentation, sizing guidance, entitlement information, or real-world experience would be greatly appreciated.

Thank you!