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Overprovisioned Storage in Azure SQL Elastic Pools or Managed Instances
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Overprovisioned Storage in Azure SQL Elastic Pools or Managed Instances
Balazs Engedi
Service Category
Databases
Cloud Provider
Azure
Service Name
Azure SQL
Inefficiency Type
Overprovisioned Resource
Explanation

Azure SQL deployments often reserve more storage than needed, either due to default provisioning settings or anticipated future growth. Over time, if actual usage remains low, these oversized allocations generate unnecessary storage costs.

In Elastic Pools, resizing can be done through standard configuration updates. In Managed Instances, reducing storage may require a shrink operation to reclaim unused space before reallocation is permitted. Without regular review, these overprovisioned environments persist as silent cost contributors.

Relevant Billing Model
  • Storage is billed per GB/month based on provisioned size
  • Charges apply even if actual database usage is significantly lower than the allocated storage
  • Additional charges apply for backup storage, compute, and IOPS depending on SKU
Detection
  • Review total provisioned storage versus actual used capacity for Elastic Pools and Managed Instances
  • Identify instances with consistently low storage usage relative to their provisioned limit
  • Confirm whether current storage needs justify the allocated capacity
  • Determine whether shrink operations are necessary to reclaim space
Remediation
  • Where supported, reduce provisioned storage to better align with actual usage
  • For Managed Instances, safely execute `DBCC SHRINKFILE` or equivalent operations before resizing
  • Incorporate storage reviews into regular database hygiene practices
  • Use forecasting or growth trends to balance cost savings with future scaling needs
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