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‎articles/sql-database/sql-database-vcore-resource-limits-elastic-pools.md

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author: oslake
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ms.author: moslake
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ms.reviewer: carlrab, sstein
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ms.date: 11/04/2019
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ms.date: 11/25/2019
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---
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# Resource limits for elastic pools using the vCore purchasing model
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> [!IMPORTANT]
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> For scaling guidance and considerations, see [Scale an elastic pool](sql-database-elastic-pool-scale.md)
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## General purpose - provisioned compute - Gen4
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> [!IMPORTANT]
@@ -42,8 +41,8 @@ You can set the service tier, compute size, and storage amount using the [Azure
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|Max number DBs per pool|100|200|500|500|500|500|
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|Columnstore support|Yes|Yes|Yes|Yes|Yes|Yes|
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|In-memory OLTP storage (GB)|N/A|N/A|N/A|N/A|N/A|N/A|
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|Max data size (GB)|512|756|756|1536|1536|1536|
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|Max log size|154|227|227|461|461|461|
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|Max data size (GB)|512|756|1536|1536|1536|2048|
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|Max log size|154|227|461|461|461|614|
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|TempDB size (GB)|32|64|96|128|160|192|
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|Storage type|Premium (Remote) Storage|Premium (Remote) Storage|Premium (Remote) Storage|Premium (Remote) Storage|Premium (Remote) Storage|Premium (Remote) Storage|
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|IO latency (approximate)|5-7 ms (write)<br>5-10 ms (read)|5-7 ms (write)<br>5-10 ms (read)|5-7 ms (write)<br>5-10 ms (read)|5-7 ms (write)<br>5-10 ms (read)|5-7 ms (write)<br>5-10 ms (read)|5-7 ms (write)<br>5-10 ms (read)|
@@ -60,7 +59,6 @@ You can set the service tier, compute size, and storage amount using the [Azure
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\* For the max concurrent workers (requests) for any individual database, see [Single database resource limits](sql-database-vcore-resource-limits-single-databases.md). For example, if the elastic pool is using Gen5 and its max vCore per database is 2, then the max concurrent workers is 200. If max vCore per database is 0.5, then the max concurrent workers is 50 since on Gen5 there are a max of 100 concurrent workers per vcore. For other max vCore settings per database that are less 1 vCore or less, the number of max concurrent workers is similarly rescaled.
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### General purpose service tier: Generation 4 compute platform (part 2)
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|Compute size|GP_Gen4_7|GP_Gen4_8|GP_Gen4_9|GP_Gen4_10|GP_Gen4_16|GP_Gen4_24|
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|Max number DBs per pool|500|500|500|500|500|500|
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|Columnstore support|Yes|Yes|Yes|Yes|Yes|Yes|
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|In-memory OLTP storage (GB)|N/A|N/A|N/A|N/A|N/A|N/A|
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|Max data size (GB)|1536|2048|2048|2048|3584|4096|
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|Max log size (GB)|461|614|614|614|1075|1229|
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|Max data size (GB)|2048|2048|2048|2048|3584|4096|
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|Max log size (GB)|614|614|614|614|1075|1229|
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|TempDB size (GB)|224|256|288|320|384|384|
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|Storage type|Premium (Remote) Storage|Premium (Remote) Storage|Premium (Remote) Storage|Premium (Remote) Storage|Premium (Remote) Storage|Premium (Remote) Storage|
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|IO latency (approximate)|5-7 ms (write)<br>5-10 ms (read)|5-7 ms (write)<br>5-10 ms (read)|5-7 ms (write)<br>5-10 ms (read)|5-7 ms (write)<br>5-10 ms (read)|5-7 ms (write)<br>5-10 ms (read)|5-7 ms (write)<br>5-10 ms (read)|
@@ -89,7 +87,6 @@ You can set the service tier, compute size, and storage amount using the [Azure
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\* For the max concurrent workers (requests) for any individual database, see [Single database resource limits](sql-database-vcore-resource-limits-single-databases.md). For example, if the elastic pool is using Gen5 and its max vCore per database is 2, then the max concurrent workers is 200. If max vCore per database is 0.5, then the max concurrent workers is 50 since on Gen5 there are a max of 100 concurrent workers per vcore. For other max vCore settings per database that are less 1 vCore or less, the number of max concurrent workers is similarly rescaled.
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## General purpose - provisioned compute - Gen5
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### General purpose service tier: Generation 5 compute platform (part 1)
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|Max number DBs per pool|100|200|500|500|500|500|500|
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|Columnstore support|Yes|Yes|Yes|Yes|Yes|Yes|Yes|
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|In-memory OLTP storage (GB)|N/A|N/A|N/A|N/A|N/A|N/A|N/A|
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|Max data size (GB)|512|756|756|1536|1536|1536|
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|Max log size (GB)|154|227|227|461|461|461|461|
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|Max data size (GB)|512|756|1536|1536|1536|2048|2048|
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|Max log size (GB)|154|227|461|461|461|614|614|
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|TempDB size (GB)|64|128|192|256|320|384|384|
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|Storage type|Premium (Remote) Storage|Premium (Remote) Storage|Premium (Remote) Storage|Premium (Remote) Storage|Premium (Remote) Storage|Premium (Remote) Storage|Premium (Remote) Storage|
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|IO latency (approximate)|5-7 ms (write)<br>5-10 ms (read)|5-7 ms (write)<br>5-10 ms (read)|5-7 ms (write)<br>5-10 ms (read)|5-7 ms (write)<br>5-10 ms (read)|5-7 ms (write)<br>5-10 ms (read)|5-7 ms (write)<br>5-10 ms (read)|5-7 ms (write)<br>5-10 ms (read)|
@@ -130,8 +127,8 @@ You can set the service tier, compute size, and storage amount using the [Azure
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|Max number DBs per pool|500|500|500|500|500|500|500|
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|Columnstore support|Yes|Yes|Yes|Yes|Yes|Yes|Yes|
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|In-memory OLTP storage (GB)|N/A|N/A|N/A|N/A|N/A|N/A|N/A|
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|Max data size (GB)|2048|2048|3072|3072|4096|4096|4096|
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|Max log size (GB)|614|614|922|922|1229|1229|1229|
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|Max data size (GB)|2048|3072|3072|3072|4096|4096|4096|
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|Max log size (GB)|614|922|922|922|1229|1229|1229|
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|TempDB size (GB)|384|384|384|384|384|384|384|
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|Storage type|Premium (Remote) Storage|Premium (Remote) Storage|Premium (Remote) Storage|Premium (Remote) Storage|Premium (Remote) Storage|Premium (Remote) Storage|Premium (Remote) Storage|
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|IO latency (approximate)|5-7 ms (write)<br>5-10 ms (read)|5-7 ms (write)<br>5-10 ms (read)|5-7 ms (write)<br>5-10 ms (read)|5-7 ms (write)<br>5-10 ms (read)|5-7 ms (write)<br>5-10 ms (read)|5-7 ms (write)<br>5-10 ms (read)|5-7 ms (write)<br>5-10 ms (read)|
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|Read Scale-out|N/A|
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|Included backup storage|1X DB size|
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\* For the max concurrent workers (requests) for any individual database, see [Single database resource limits](sql-database-vcore-resource-limits-single-databases.md). For example, if the elastic pool is using Gen5 and its max vCore per database is 2, then the max concurrent workers is 200. If max vCore per database is 0.5, then the max concurrent workers is 50 since on Gen5 there are a max of 100 concurrent workers per vcore. For other max vCore settings per database that are less 1 vCore or less, the number of max concurrent workers is similarly rescaled.
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## Business critical - provisioned compute - Gen4
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> [!IMPORTANT]
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> New Gen4 databases are no longer supported in the Australia East or Brazil South regions.
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### Business critical service tier: Generation 4 compute platform (part 1)
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|Compute size|BC_Gen4_1|BC_Gen4_2|BC_Gen4_3|BC_Gen4_4|BC_Gen4_5|BC_Gen4_6|
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|Compute size|BC_Gen4_2|BC_Gen4_3|BC_Gen4_4|BC_Gen4_5|BC_Gen4_6|
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|:--- | --: |--: |--: |--: |--: |--: |
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|Compute generation|Gen4|Gen4|Gen4|Gen4|Gen4|Gen4|
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|vCores|1|2|3|4|5|6|
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|Memory (GB)|7|14|21|28|35|42|
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|Max number DBs per pool|Only single DBs are supported for this compute size|50|100|100|100|100|
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|Columnstore support|Yes|Yes|Yes|Yes|Yes|Yes|
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|In-memory OLTP storage (GB)|1|2|3|4|5|6|
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|Storage type|Local SSD|Local SSD|Local SSD|Local SSD|Local SSD|Local SSD|
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|Max data size (GB)|650|650|650|650|650|650|
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|Max log size (GB)|195|195|195|195|195|195|
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|TempDB size (GB)|32|64|96|128|160|192|
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|IO latency (approximate)|1-2 ms (write)<br>1-2 ms (read)|1-2 ms (write)<br>1-2 ms (read)|1-2 ms (write)<br>1-2 ms (read)|1-2 ms (write)<br>1-2 ms (read)|1-2 ms (write)<br>1-2 ms (read)|1-2 ms (write)<br>1-2 ms (read)|
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|Target IOPS (64 KB)|5000|10000|15000|20000|25000|30000|
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|Log rate limits (MBps)|10|20|30|40|50|60|
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|Max concurrent workers per pool (requests) *|210|420|630|840|1050|1260|
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|Max concurrent logins per pool (requests) *|210|420|630|840|1050|1260|
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|Max allowed sessions|30000|30000|30000|30000|30000|30000|
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|Min/max elastic pool vCore choices per database|N/A|0, 0.25, 0.5, 1, 2|0, 0.25, 0.5, 1...3|0, 0.25, 0.5, 1...4|0, 0.25, 0.5, 1...5|0, 0.25, 0.5, 1...6|
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|Number of replicas|4|4|4|4|4|4|
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|Multi-AZ|Yes|Yes|Yes|Yes|Yes|Yes|
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|Read Scale-out|Yes|Yes|Yes|Yes|Yes|Yes|
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|Included backup storage|1X DB size|1X DB size|1X DB size|1X DB size|1X DB size|1X DB size|
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|Compute generation|Gen4|Gen4|Gen4|Gen4|Gen4|
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|vCores|2|3|4|5|6|
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|Memory (GB)|14|21|28|35|42|
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|Max number DBs per pool|100|100|100|100|100|
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|Columnstore support|Yes|Yes|Yes|Yes|Yes|
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|In-memory OLTP storage (GB)|2|3|4|5|6|
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|Storage type|Local SSD|Local SSD|Local SSD|Local SSD|Local SSD|
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|Max data size (GB)|1024|1024|1024|1024|1024|
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|Max log size (GB)|307|307|307|307|307|
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|TempDB size (GB)|64|96|128|160|192|
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|IO latency (approximate)|1-2 ms (write)<br>1-2 ms (read)|1-2 ms (write)<br>1-2 ms (read)|1-2 ms (write)<br>1-2 ms (read)|1-2 ms (write)<br>1-2 ms (read)|1-2 ms (write)<br>1-2 ms (read)|
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|Target IOPS (64 KB)|10000|15000|20000|25000|30000|
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|Log rate limits (MBps)|20|30|40|50|60|
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|Max concurrent workers per pool (requests) *|420|630|840|1050|1260|
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|Max concurrent logins per pool (requests) *|420|630|840|1050|1260|
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|Max allowed sessions|30000|30000|30000|30000|30000|
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|Min/max elastic pool vCore choices per database|0, 0.25, 0.5, 1, 2|0, 0.25, 0.5, 1...3|0, 0.25, 0.5, 1...4|0, 0.25, 0.5, 1...5|0, 0.25, 0.5, 1...6|
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|Number of replicas|4|4|4|4|4|
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|Multi-AZ|Yes|Yes|Yes|Yes|Yes|
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|Read Scale-out|Yes|Yes|Yes|Yes|Yes|
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|Included backup storage|1X DB size|1X DB size|1X DB size|1X DB size|1X DB size|
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\* For the max concurrent workers (requests) for any individual database, see [Single database resource limits](sql-database-vcore-resource-limits-single-databases.md). For example, if the elastic pool is using Gen5 and its max vCore per database is 2, then the max concurrent workers is 200. If max vCore per database is 0.5, then the max concurrent workers is 50 since on Gen5 there are a max of 100 concurrent workers per vcore. For other max vCore settings per database that are less 1 vCore or less, the number of max concurrent workers is similarly rescaled.
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|Columnstore support|N/A|N/A|N/A|N/A|N/A|N/A|
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|In-memory OLTP storage (GB)|7|8|9.5|11|20|36|
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|Storage type|Local SSD|Local SSD|Local SSD|Local SSD|Local SSD|Local SSD|
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|Max data size (GB)|650|650|650|650|1024|1024|
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|Max log size (GB)|195|195|195|195|307|307|
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|Max data size (GB)|1024|1024|1024|1024|1024|1024|
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|Max log size (GB)|307|307|307|307|307|307|
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|TempDB size (GB)|224|256|288|320|384|384|
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|IO latency (approximate)|1-2 ms (write)<br>1-2 ms (read)|1-2 ms (write)<br>1-2 ms (read)|1-2 ms (write)<br>1-2 ms (read)|1-2 ms (write)<br>1-2 ms (read)|1-2 ms (write)<br>1-2 ms (read)|1-2 ms (write)<br>1-2 ms (read)|
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|Target IOPS (64 KB)|35000|40000|45000|50000|80000|120000|
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### Business critical service tier: Generation 5 compute platform (part 1)
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|Compute size|BC_Gen5_2|BC_Gen5_4|BC_Gen5_6|BC_Gen5_8|BC_Gen5_10|BC_Gen5_12|BC_Gen5_14|
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|Compute size|BC_Gen5_4|BC_Gen5_6|BC_Gen5_8|BC_Gen5_10|BC_Gen5_12|BC_Gen5_14|
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|:--- | --: |--: |--: |--: |---: | --: |--: |
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|Compute generation|Gen5|Gen5|Gen5|Gen5|Gen5|Gen5|Gen5|
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|vCores|2|4|6|8|10|12|14|
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|Memory (GB)|10.2|20.4|30.6|40.8|51|61.2|71.4|
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|Max number DBs per pool|Only single DBs are supported for this compute size|50|100|100|100|100|100|
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|Columnstore support|Yes|Yes|Yes|Yes|Yes|Yes|Yes|
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|In-memory OLTP storage (GB)|1.571|3.142|4.713|6.284|8.655|11.026|13.397|
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|Max data size (GB)|1024|1024|1536|1536|1536|3072|3072|
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|Max log size (GB)|307|307|307|461|461|922|922|
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|TempDB size (GB)|64|128|192|256|320|384|384|
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|Storage type|Local SSD|Local SSD|Local SSD|Local SSD|Local SSD|Local SSD|Local SSD|
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|IO latency (approximate)|1-2 ms (write)<br>1-2 ms (read)|1-2 ms (write)<br>1-2 ms (read)|1-2 ms (write)<br>1-2 ms (read)|1-2 ms (write)<br>1-2 ms (read)|1-2 ms (write)<br>1-2 ms (read)|1-2 ms (write)<br>1-2 ms (read)|1-2 ms (write)<br>1-2 ms (read)|
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|Target IOPS (64 KB)|5000|10000|15000|20000|25000|30000|35000|
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|Log rate limits (MBps)|15|30|45|60|75|90|105|
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|Max concurrent workers per pool (requests) *|210|420|630|840|1050|1260|1470|
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|Max concurrent logins per pool (requests) *|210|420|630|840|1050|1260|1470|
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|Max allowed sessions|30000|30000|30000|30000|30000|30000|30000|
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|Min/max elastic pool vCore choices per database|N/A|0, 0.25, 0.5, 1...4|0, 0.25, 0.5, 1...6|0, 0.25, 0.5, 1...8|0, 0.25, 0.5, 1...10|0, 0.25, 0.5, 1...12|0, 0.25, 0.5, 1...14|
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|Number of replicas|4|4|4|4|4|4|4|
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|Compute generation|Gen5|Gen5|Gen5|Gen5|Gen5|Gen5|
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|vCores|4|6|8|10|12|14|
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|Memory (GB)|20.4|30.6|40.8|51|61.2|71.4|
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|Max number DBs per pool|100|100|100|100|100|100|
245+
|Columnstore support|Yes|Yes|Yes|Yes|Yes|Yes|
246+
|In-memory OLTP storage (GB)|3.142|4.713|6.284|8.655|11.026|13.397|
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|Max data size (GB)|1024|1536|1536|1536|3072|3072|
248+
|Max log size (GB)|307|307|461|461|922|922|
249+
|TempDB size (GB)|128|192|256|320|384|384|
250+
|Storage type|Local SSD|Local SSD|Local SSD|Local SSD|Local SSD|Local SSD|
251+
|IO latency (approximate)|1-2 ms (write)<br>1-2 ms (read)|1-2 ms (write)<br>1-2 ms (read)|1-2 ms (write)<br>1-2 ms (read)|1-2 ms (write)<br>1-2 ms (read)|1-2 ms (write)<br>1-2 ms (read)|1-2 ms (write)<br>1-2 ms (read)|
252+
|Target IOPS (64 KB)|10000|15000|20000|25000|30000|35000|
253+
|Log rate limits (MBps)|30|45|60|75|90|105|
254+
|Max concurrent workers per pool (requests) *|420|630|840|1050|1260|1470|
255+
|Max concurrent logins per pool (requests) *|420|630|840|1050|1260|1470|
256+
|Max allowed sessions|30000|30000|30000|30000|30000|30000|
257+
|Min/max elastic pool vCore choices per database|0, 0.25, 0.5, 1...4|0, 0.25, 0.5, 1...6|0, 0.25, 0.5, 1...8|0, 0.25, 0.5, 1...10|0, 0.25, 0.5, 1...12|0, 0.25, 0.5, 1...14|
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|Number of replicas|4|4|4|4|4|4|
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|Multi-AZ|Yes|Yes|Yes|Yes|Yes|Yes|
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|Read Scale-out|Yes|Yes|Yes|Yes|Yes|Yes|Yes|
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|Included backup storage|1X DB size|1X DB size|1X DB size|1X DB size|1X DB size|1X DB size|1X DB size|
260+
|Read Scale-out|Yes|Yes|Yes|Yes|Yes|Yes|
261+
|Included backup storage|1X DB size|1X DB size|1X DB size|1X DB size|1X DB size|1X DB size|
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\* For the max concurrent workers (requests) for any individual database, see [Single database resource limits](sql-database-vcore-resource-limits-single-databases.md). For example, if the elastic pool is using Gen5 and its max vCore per database is 2, then the max concurrent workers is 200. If max vCore per database is 0.5, then the max concurrent workers is 50 since on Gen5 there are a max of 100 concurrent workers per vcore. For other max vCore settings per database that are less 1 vCore or less, the number of max concurrent workers is similarly rescaled.
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