---
sourceDocument: Yokohama IT Operations Management
sourceDocumentLink: https://servicenow-prod.fluidtopics.net/r/yokohama/it-operations-management

 Release :

    - yokohama

ft:locale :

    - en-US

ft:publication_title :

    - Yokohama IT Operations Management

ft:clusterId :

    - itom

bundleId :

    - itom

workflow :

    - Technology


---

# Modify event table rotation

# Modify event table rotation {#ariaid-title1}

* Release version: Yokohama
* 
* Updated January 30, 2025
* 
* ![](https://www.servicenow.com/docs/portal-asset/ico-clock) 1 minute to read

Table rotation is used by Event Management, by default, to
contain the growth of event \[em_event\] tables within the rotation table group.

## Before you begin

Role required: evt_mgmt_admin

## About this task

Table rotation ensures that event tables grow to a reasonable size.

Each table rotation has a schedule, according to which new data is written to one of the tables in the rotation group. A table rotation
group includes the original table plus several additional tables. After the rotation procedure has written the last table in a rotation, the rotation overwrites the first table in the rotation. By default, the table rotation for Event Management is to rotate the em_table to an offload table and the base table cleanup takes place after seven table rotations. For information about backing up events to a custom table, see [Event Management configuration preferences](https://servicenow-prod.fluidtopics.net/WX5uB5nhCpuS1TthTDtUZQ "Preferred settings of properties and general configuration.").

## Procedure

1. Navigate to AllSystem DefinitionTable Rotations.
2. Select the \[em_event\] table rotation group to modify.
3. Edit the required fields.
4. Select Update.
{#event-table-rotation__steps_lth_nfq_3yb}
**Related concepts**   

* [Rotate event tables and alert table cleanup](https://servicenow-prod.fluidtopics.net/EFvGJm8xCam46Sers9JrXw "The growth of data tables impedes performance. Preserve instance performance by event table rotation and alert table cleanup for status and alert history retention.")  
**Related topics**   

* [Table rotation](https://www.servicenow.com/docs/access?context=c_TableRotation&version=yokohama&pubname=yokohama-platform-administration&ft:locale=en-US)
* [Apply table rotation](https://www.servicenow.com/docs/access?context=t_ApplyTableRotation&version=yokohama&pubname=yokohama-platform-administration&ft:locale=en-US)

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