How Azure Databricks prepurchase discount is applied

You can use prepurchased Azure Databricks commit units (DBCU) at any time during the purchase term. Any Azure Databricks usage is deducted from the prepurchased DBCUs automatically.

Unlike VMs, prepurchased units don't expire on an hourly basis. You can use them at any time during the term of the purchase. To get the prepurchase discounts, you don't need to redeploy or assign a prepurchased plan to your Azure Databricks workspaces for the usage.

The prepurchase discount applies only to Azure Databricks unit (DBU) usage. Other charges such as compute, storage, and networking are charged separately.

Prepurchase discount application

Databricks prepurchase applies to all Databricks workloads and tiers. You can think of the prepurchase as a pool of prepaid Databricks commit units. Usage is deducted from the pool, regardless of the workload or tier. Usage is deducted in the following ratio:

Workload DBU application ratio — Standard tier DBU application ratio — Premium tier
All Purpose Compute 0.4 0.55
Jobs Compute 0.15 0.30
Jobs Light Compute 0.07 0.22
SQL Compute NA 0.22
Delta Live Tables NA 0.30 (core), 0.38 (pro), 0.54 (advanced)
All Purpose Photon NA 0.55

For example, when a quantity of Data Analytics – Standard tier is consumed, the prepurchased Databricks commit units is deducted by 0.4 units. When a quantity of Data Engineering Light – Standard tier is used, the prepurchased Databricks commit unit is deducted by 0.07 units.

Note: enabling Photon will increase the DBU count.

Determine plan use

To determine your DBCU plan use, go to the Azure portal > Reservations and select the purchased Databricks plan. Your utilization to-date is shown with any remaining units. For more information about determining your reservation use, see the See reservation usage article.

How discount application shows in usage data

When the prepurchase discount applies to your Databricks usage, on-demand charges appear as zero in the usage data. For more information about reservation costs and usage, see Get Enterprise Agreement reservation costs and usage.

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