---
schema_version: "1"
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title: Schedule a Secondary Index Refresh
collection: admin
version: current
locale: en-us
portal_url: https://docs.salesforce.com/admin/current/en-us/data/264-0-0/c360_a_schedule_secondary_index_refresh.md
canonical_url: https://help.salesforce.com/s/articleView?id=data.c360_a_schedule_secondary_index_refresh.htm&release=264.0.0&type=5
source_site: help.salesforce.com
content_type: documentation
content_hash: e56190590486ef358dba652f84934e35d60a186edf35b9eeea3a338555d28ed9
description: Set how often Data 360 refreshes a secondary index so that the index stays current with the underlying object. Choose a refresh frequency that keeps the index fresh enough for your queries without refreshing more often than your data changes.
products:
  - Data 360
release: "264"
---
# Schedule a Secondary Index Refresh

Set how often Data 360 refreshes a secondary index so that the index stays current with the underlying object. Choose a refresh frequency that keeps the index fresh enough for your queries without refreshing more often than your data changes.

Data 360 refreshes each secondary index on a schedule. Secondary index refreshes are incremental and only rebuild the portion of the index affected by changed data, which reduces refresh cost and data freshness lag.

You can set the refresh schedule when you create a secondary index, or update it later for an existing index. Because each refresh consumes credits, refreshing more frequently increases consumption. For more information, see [Billing Considerations for Secondary Indexes](https://help.salesforce.com/s/articleView?id=data.c360_a_billing_considerations_secondary_index.htm&release=264.0.0&type=5 "Data 360 Secondary Indexes enable faster query performance and more efficient data retrieval with attributes other than the primary identifier. Use of secondary indexes impacts the consumption of credits used for billing in these usage types.").

1. To update the schedule for an existing secondary index, open the index record and choose **Update Schedule**.
    
    ![The Update Schedule window for a secondary index, showing the Frequency, Daily Start Time, Time Zone, and Scheduled Day(s) fields.](https://sf-zdocs-cdn-prod.zoominsoftware.com/tdta-data-data_cloud-264-0-0-production-enus/f3569962-3c9b-4f83-9d0c-b6a574e785da/data_cloud/images/secondary-index-update-schedule.png)
2. For **Frequency**, choose how often the index refreshes: **Hourly**, **Daily**, or **Weekly**.
    
    Secondary indexes work best on objects that update at most every 24 hours. For frequently updated objects, refreshing more often can increase cost without improving freshness. For best results, align your refresh schedule with your data update frequency.
3. If you chose **Hourly** or **Daily**, set **Run Every** to the number of hours or days between refreshes.
4. For **Daily Start Time** and **Time Zone**, choose when each refresh runs.
5. If you chose **Hourly** or **Weekly**, select one or more days under **Scheduled Day(s)**.
6. Choose **Save**.

You can change the refresh schedule at any time. Changing the schedule doesn't rebuild the index immediately. The new schedule applies to the next refresh.