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Updating IOPS for Business Critical to 2500/vCore
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articles/sql-database/sql-database-managed-instance-resource-limits.md

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author: bonova
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ms.author: bonova
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ms.reviewer: carlrab, jovanpop, sachinp, sstein
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ms.date: 02/18/2020
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ms.date: 02/25/2020
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---
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# Overview Azure SQL Database managed instance resource limits
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| Max number of database files per instance | Up to 280, unless the instance storage size or [Azure Premium Disk storage allocation space](sql-database-managed-instance-transact-sql-information.md#exceeding-storage-space-with-small-database-files) limit has been reached. | 32,767 files per database, unless the instance storage size limit has been reached. |
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| Max data file size | Limited to currently available instance storage size (max 2 TB - 8 TB) and [Azure Premium Disk storage allocation space](sql-database-managed-instance-transact-sql-information.md#exceeding-storage-space-with-small-database-files). | Limited to currently available instance storage size (up to 1 TB - 4 TB). |
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| Max log file size | Limited to 2 TB and currently available instance storage size. | Limited to 2 TB and currently available instance storage size. |
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| Data/Log IOPS (approximate) | Up to 30-40 K IOPS per instance*, 500 - 7500 per file<br/>\*[Increase file size to get more IOPS](#file-io-characteristics-in-general-purpose-tier)| 5.5 K - 110 K (1375 IOPS/vCore)<br/>Add more vCores to get better IO performance. |
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| Data/Log IOPS (approximate) | Up to 30-40 K IOPS per instance*, 500 - 7500 per file<br/>\*[Increase file size to get more IOPS](#file-io-characteristics-in-general-purpose-tier)| 10 K - 200 K (2500 IOPS/vCore)<br/>Add more vCores to get better IO performance. |
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| Log write throughput limit (per instance) | 3 MB/s per vCore<br/>Max 22 MB/s | 4 MB/s per vCore<br/>Max 48 MB/s |
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| Data throughput (approximate) | 100 - 250 MB/s per file<br/>\*[Increase the file size to get better IO performance](#file-io-characteristics-in-general-purpose-tier) | Not limited. |
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| Storage IO latency (approximate) | 5-10 ms | 1-2 ms |

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