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Add more server parameter limits
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‎articles/mariadb/concepts-limits.md

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@@ -5,29 +5,32 @@ author: ajlam
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ms.author: andrela
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ms.service: mariadb
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ms.topic: conceptual
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ms.date: 12/09/2019
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ms.date: 3/9/2020
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---
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# Limitations in Azure Database for MariaDB
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The following sections describe capacity, storage engine support, privilege support, data manipulation statement support, and functional limits in the database service.
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## Maximum connections
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The maximum number of connections per pricing tier and vCores are as follows:
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|**Pricing Tier**|**vCore(s)**| **Max Connections**|
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|---|---|---|
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|Basic| 1| 50|
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|Basic| 2| 100|
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|General Purpose| 2| 600|
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|General Purpose| 4| 1250|
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|General Purpose| 8| 2500|
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|General Purpose| 16| 5000|
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|General Purpose| 32| 10000|
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|General Purpose| 64| 20000|
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|Memory Optimized| 2| 800|
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|Memory Optimized| 4| 2500|
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|Memory Optimized| 8| 5000|
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|Memory Optimized| 16| 10000|
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|Memory Optimized| 32| 20000|
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## Server parameters
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The minimum and maximum values of several popular server parameters are determined by the pricing tier and vCores. Refer to the below tables for limits.
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### max_connections
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|**Pricing Tier**|**vCore(s)**|**Default value**|**Min value**|**Max value**|
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|---|---|---|---|---|
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|Basic|1|50|10|50|
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|Basic|2|100|10|100|
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|General Purpose|2|300|10|600|
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|General Purpose|4|625|10|1250|
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|General Purpose|8|1250|10|2500|
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|General Purpose|16|2500|10|5000|
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|General Purpose|32|5000|10|10000|
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|General Purpose|64|10000|10|20000|
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|Memory Optimized|2|600|10|800|
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|Memory Optimized|4|1250|10|2500|
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|Memory Optimized|8|2500|10|5000|
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|Memory Optimized|16|5000|10|10000|
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|Memory Optimized|32|10000|10|20000|
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When connections exceed the limit, you may receive the following error:
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> ERROR 1040 (08004): Too many connections
@@ -37,6 +40,108 @@ When connections exceed the limit, you may receive the following error:
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Creating new client connections to MariaDB takes time and once established, these connections occupy database resources, even when idle. Most applications request many short-lived connections, which compounds this situation. The result is fewer resources available for your actual workload leading to decreased performance. A connection pooler that decreases idle connections and reuses existing connections will help avoid this. To learn about setting up ProxySQL, visit our [blog post](https://techcommunity.microsoft.com/t5/azure-database-for-mysql/load-balance-read-replicas-using-proxysql-in-azure-database-for/ba-p/880042).
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## query_cache_size
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The query cache is turned off by default. To enable the query cache, configure the `query_cache_type` parameter.
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Review the [MariaDB documentation](https://mariadb.com/kb/en/server-system-variables/#query_cache_size) to learn more about this parameter.
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|**Pricing Tier**|**vCore(s)**|**Default value**|**Min value**|**Max value**|
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|---|---|---|---|---|
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|Basic|1|Not configurable in Basic tier|N/A|N/A|
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|Basic|2|Not configurable in Basic tier|N/A|N/A|
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|General Purpose|2|0|0|16777216|
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|General Purpose|4|0|0|33554432|
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|General Purpose|8|0|0|67108864|
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|General Purpose|16|0|0|134217728|
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|General Purpose|32|0|0|134217728|
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|General Purpose|64|0|0|134217728|
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|Memory Optimized|2|0|0|33554432|
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|Memory Optimized|4|0|0|67108864|
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|Memory Optimized|8|0|0|134217728|
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|Memory Optimized|16|0|0|134217728|
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|Memory Optimized|32|0|0|134217728|
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## sort_buffer_size
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Review the [MariaDB documentation](https://mariadb.com/kb/en/server-system-variables/#sort_buffer_size) to learn more about this parameter.
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|**Pricing Tier**|**vCore(s)**|**Default value**|**Min value**|**Max value**|
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|---|---|---|---|---|
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|Basic|1|Not configurable in Basic tier|N/A|N/A|
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|Basic|2|Not configurable in Basic tier|N/A|N/A|
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|General Purpose|2|524288|32768|4194304|
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|General Purpose|4|524288|32768|8388608|
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|General Purpose|8|524288|32768|16777216|
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|General Purpose|16|524288|32768|33554432|
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|General Purpose|32|524288|32768|33554432|
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|General Purpose|64|524288|32768|33554432|
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|Memory Optimized|2|524288|32768|8388608|
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|Memory Optimized|4|524288|32768|16777216|
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|Memory Optimized|8|524288|32768|33554432|
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|Memory Optimized|16|524288|32768|33554432|
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|Memory Optimized|32|524288|32768|33554432|
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## join_buffer_size
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Review the [MariaDB documentation](https://mariadb.com/kb/en/server-system-variables/#join_buffer_size) to learn more about this parameter.
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|**Pricing Tier**|**vCore(s)**|**Default value**|**Min value**|**Max value**|
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|---|---|---|---|---|
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|Basic|1|Not configurable in Basic tier|N/A|N/A|
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|Basic|2|Not configurable in Basic tier|N/A|N/A|
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|General Purpose|2|262144|128|268435455|
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|General Purpose|4|262144|128|536870912|
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|General Purpose|8|262144|128|1073741824|
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|General Purpose|16|262144|128|2147483648|
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|General Purpose|32|262144|128|4294967295|
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|General Purpose|64|262144|128|4294967295|
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|Memory Optimized|2|262144|128|536870912|
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|Memory Optimized|4|262144|128|1073741824|
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|Memory Optimized|8|262144|128|2147483648|
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|Memory Optimized|16|262144|128|4294967295|
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|Memory Optimized|32|262144|128|4294967295|
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## max_heap_table_size
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Review the [MariaDB documentation](https://mariadb.com/kb/en/server-system-variables/#max_heap_table_size) to learn more about this parameter.
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|**Pricing Tier**|**vCore(s)**|**Default value**|**Min value**|**Max value**|
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|---|---|---|---|---|
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|Basic|1|Not configurable in Basic tier|N/A|N/A|
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|Basic|2|Not configurable in Basic tier|N/A|N/A|
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|General Purpose|2|16777216|16384|268435455|
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|General Purpose|4|16777216|16384|536870912|
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|General Purpose|8|16777216|16384|1073741824|
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|General Purpose|16|16777216|16384|2147483648|
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|General Purpose|32|16777216|16384|4294967295|
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|General Purpose|64|16777216|16384|4294967295|
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|Memory Optimized|2|16777216|16384|536870912|
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|Memory Optimized|4|16777216|16384|1073741824|
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|Memory Optimized|8|16777216|16384|2147483648|
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|Memory Optimized|16|16777216|16384|4294967295|
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|Memory Optimized|32|16777216|16384|4294967295|
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## tmp_table_size
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Review the [MariaDB documentation](https://mariadb.com/kb/en/server-system-variables/#tmp_table_size) to learn more about this parameter.
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|**Pricing Tier**|**vCore(s)**|**Default value**|**Min value**|**Max value**|
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|---|---|---|---|---|
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|Basic|1|Not configurable in Basic tier|N/A|N/A|
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|Basic|2|Not configurable in Basic tier|N/A|N/A|
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|General Purpose|2|16777216|1024|67108864|
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|General Purpose|4|16777216|1024|134217728|
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|General Purpose|8|16777216|1024|268435456|
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|General Purpose|16|16777216|1024|536870912|
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|General Purpose|32|16777216|1024|1073741824|
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|General Purpose|64|16777216|1024|1073741824|
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|Memory Optimized|2|16777216|1024|134217728|
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|Memory Optimized|4|16777216|1024|268435456|
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|Memory Optimized|8|16777216|1024|536870912|
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|Memory Optimized|16|16777216|1024|1073741824|
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|Memory Optimized|32|16777216|1024|1073741824|
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## Storage engine support
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### Supported
@@ -92,5 +197,5 @@ Requires super privileges to create and is restricted. If importing data using a
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- MariaDB server instance displays the incorrect server version after connection is established. To get the correct server instance engine version, use the `select version();` command.
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## Next steps
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- [What’s available in each service tier](concepts-pricing-tiers.md)
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- [What's available in each service tier](concepts-pricing-tiers.md)
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- [Supported MariaDB database versions](concepts-supported-versions.md)

‎articles/mysql/concepts-limits.md

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Original file line numberDiff line numberDiff line change
@@ -5,29 +5,32 @@ author: ajlam
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ms.author: andrela
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ms.service: mysql
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ms.topic: conceptual
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ms.date: 12/9/2019
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ms.date: 3/9/2020
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---
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# Limitations in Azure Database for MySQL
1111
The following sections describe capacity, storage engine support, privilege support, data manipulation statement support, and functional limits in the database service. Also see [general limitations](https://dev.mysql.com/doc/mysql-reslimits-excerpt/5.6/en/limits.html) applicable to the MySQL database engine.
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## Maximum connections
14-
The maximum number of connections per pricing tier and vCores are as follows:
15-
16-
|**Pricing Tier**|**vCore(s)**| **Max Connections**|
17-
|---|---|---|
18-
|Basic| 1| 50|
19-
|Basic| 2| 100|
20-
|General Purpose| 2| 600|
21-
|General Purpose| 4| 1250|
22-
|General Purpose| 8| 2500|
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|General Purpose| 16| 5000|
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|General Purpose| 32| 10000|
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|General Purpose| 64| 20000|
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|Memory Optimized| 2| 1250|
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|Memory Optimized| 4| 2500|
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|Memory Optimized| 8| 5000|
29-
|Memory Optimized| 16| 10000|
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|Memory Optimized| 32| 20000|
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## Server parameters
14+
15+
The minimum and maximum values of several popular server parameters are determined by the pricing tier and vCores. Refer to the below tables for limits.
16+
17+
### max_connections
18+
19+
|**Pricing Tier**|**vCore(s)**|**Default value**|**Min value**|**Max value**|
20+
|---|---|---|---|---|
21+
|Basic|1|50|10|50|
22+
|Basic|2|100|10|100|
23+
|General Purpose|2|300|10|600|
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|General Purpose|4|625|10|1250|
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|General Purpose|8|1250|10|2500|
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|General Purpose|16|2500|10|5000|
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|General Purpose|32|5000|10|10000|
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|General Purpose|64|10000|10|20000|
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|Memory Optimized|2|600|10|800|
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|Memory Optimized|4|1250|10|2500|
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|Memory Optimized|8|2500|10|5000|
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|Memory Optimized|16|5000|10|10000|
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|Memory Optimized|32|10000|10|20000|
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When connections exceed the limit, you may receive the following error:
3336
> ERROR 1040 (08004): Too many connections
@@ -37,6 +40,111 @@ When connections exceed the limit, you may receive the following error:
3740
3841
Creating new client connections to MySQL takes time and once established, these connections occupy database resources, even when idle. Most applications request many short-lived connections, which compounds this situation. The result is fewer resources available for your actual workload leading to decreased performance. A connection pooler that decreases idle connections and reuses existing connections will help avoid this. To learn about setting up ProxySQL, visit our [blog post](https://techcommunity.microsoft.com/t5/azure-database-for-mysql/load-balance-read-replicas-using-proxysql-in-azure-database-for/ba-p/880042).
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## query_cache_size
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The query cache is turned off by default. To enable the query cache, configure the `query_cache_type` parameter.
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Review the [MySQL documentation](https://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_query_cache_size) to learn more about this parameter.
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> [!NOTE]
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> The query cache is deprecated as of MySQL 5.7.20 and has been removed in MySQL 8.0
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|**Pricing Tier**|**vCore(s)**|**Default value**|**Min value**|**Max value**|
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|---|---|---|---|---|
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|Basic|1|Not configurable in Basic tier|N/A|N/A|
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|Basic|2|Not configurable in Basic tier|N/A|N/A|
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|General Purpose|2|0|0|16777216|
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|General Purpose|4|0|0|33554432|
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|General Purpose|8|0|0|67108864|
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|General Purpose|16|0|0|134217728|
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|General Purpose|32|0|0|134217728|
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|General Purpose|64|0|0|134217728|
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|Memory Optimized|2|0|0|33554432|
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|Memory Optimized|4|0|0|67108864|
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|Memory Optimized|8|0|0|134217728|
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|Memory Optimized|16|0|0|134217728|
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|Memory Optimized|32|0|0|134217728|
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## sort_buffer_size
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Review the [MySQL documentation](https://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_sort_buffer_size) to learn more about this parameter.
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|**Pricing Tier**|**vCore(s)**|**Default value**|**Min value**|**Max value**|
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|---|---|---|---|---|
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|Basic|1|Not configurable in Basic tier|N/A|N/A|
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|Basic|2|Not configurable in Basic tier|N/A|N/A|
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|General Purpose|2|524288|32768|4194304|
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|General Purpose|4|524288|32768|8388608|
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|General Purpose|8|524288|32768|16777216|
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|General Purpose|16|524288|32768|33554432|
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|General Purpose|32|524288|32768|33554432|
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|General Purpose|64|524288|32768|33554432|
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|Memory Optimized|2|524288|32768|8388608|
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|Memory Optimized|4|524288|32768|16777216|
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|Memory Optimized|8|524288|32768|33554432|
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|Memory Optimized|16|524288|32768|33554432|
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|Memory Optimized|32|524288|32768|33554432|
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## join_buffer_size
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Review the [MySQL documentation](https://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_join_buffer_size) to learn more about this parameter.
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|**Pricing Tier**|**vCore(s)**|**Default value**|**Min value**|**Max value**|
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|---|---|---|---|---|
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|Basic|1|Not configurable in Basic tier|N/A|N/A|
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|Basic|2|Not configurable in Basic tier|N/A|N/A|
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|General Purpose|2|262144|128|268435455|
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|General Purpose|4|262144|128|536870912|
98+
|General Purpose|8|262144|128|1073741824|
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|General Purpose|16|262144|128|2147483648|
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|General Purpose|32|262144|128|4294967295|
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|General Purpose|64|262144|128|4294967295|
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|Memory Optimized|2|262144|128|536870912|
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|Memory Optimized|4|262144|128|1073741824|
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|Memory Optimized|8|262144|128|2147483648|
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|Memory Optimized|16|262144|128|4294967295|
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|Memory Optimized|32|262144|128|4294967295|
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## max_heap_table_size
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Review the [MySQL documentation](https://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_max_heap_table_size) to learn more about this parameter.
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|**Pricing Tier**|**vCore(s)**|**Default value**|**Min value**|**Max value**|
113+
|---|---|---|---|---|
114+
|Basic|1|Not configurable in Basic tier|N/A|N/A|
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|Basic|2|Not configurable in Basic tier|N/A|N/A|
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|General Purpose|2|16777216|16384|268435455|
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|General Purpose|4|16777216|16384|536870912|
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|General Purpose|8|16777216|16384|1073741824|
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|General Purpose|16|16777216|16384|2147483648|
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|General Purpose|32|16777216|16384|4294967295|
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|General Purpose|64|16777216|16384|4294967295|
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|Memory Optimized|2|16777216|16384|536870912|
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|Memory Optimized|4|16777216|16384|1073741824|
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|Memory Optimized|8|16777216|16384|2147483648|
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|Memory Optimized|16|16777216|16384|4294967295|
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|Memory Optimized|32|16777216|16384|4294967295|
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128+
## tmp_table_size
129+
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Review the [MySQL documentation](https://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_tmp_table_size) to learn more about this parameter.
131+
132+
|**Pricing Tier**|**vCore(s)**|**Default value**|**Min value**|**Max value**|
133+
|---|---|---|---|---|
134+
|Basic|1|Not configurable in Basic tier|N/A|N/A|
135+
|Basic|2|Not configurable in Basic tier|N/A|N/A|
136+
|General Purpose|2|16777216|1024|67108864|
137+
|General Purpose|4|16777216|1024|134217728|
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|General Purpose|8|16777216|1024|268435456|
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|General Purpose|16|16777216|1024|536870912|
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|General Purpose|32|16777216|1024|1073741824|
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|General Purpose|64|16777216|1024|1073741824|
142+
|Memory Optimized|2|16777216|1024|134217728|
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|Memory Optimized|4|16777216|1024|268435456|
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|Memory Optimized|8|16777216|1024|536870912|
145+
|Memory Optimized|16|16777216|1024|1073741824|
146+
|Memory Optimized|32|16777216|1024|1073741824|
147+
40148
## Storage engine support
41149

42150
### Supported
@@ -90,5 +198,5 @@ Requires super privileges to create and is restricted. If importing data using a
90198
- MySQL server instance displays the wrong server version after connection is established. To get the correct server instance engine version, use the `select version();` command.
91199

92200
## Next steps
93-
- [What’s available in each service tier](concepts-pricing-tiers.md)
201+
- [What's available in each service tier](concepts-pricing-tiers.md)
94202
- [Supported MySQL database versions](concepts-supported-versions.md)

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