Doc | Improve connect retry count for high demand endpoints on Azure (#…

…2233)

doc/snippets/Microsoft.Data.SqlClient/SqlConnection.xml

@@ -558,7 +558,7 @@ End Module
 |Authentication|N/A|The authentication method used for [Connecting to SQL Database By Using Azure Active Directory Authentication](https://azure.microsoft.com/documentation/articles/sql-database-aad-authentication/#7-connect-to-your-database-by-using-azure-active-directory-identities).<br /><br /> Valid values are:<br /><br /> `Active Directory Integrated`, `Active Directory Interactive`, `Active Directory Password`, `Active Directory Service Principal`, `Active Directory Device Code Flow`, `Active Directory Managed Identity`, `Active Directory MSI`, `Active Directory Default`, `Sql Password`.<br /><br /> For additional information see [Using Azure Active Directory authentication with SqlClient](https://docs.microsoft.com/sql/connect/ado-net/sql/azure-active-directory-authentication?view=sql-server-ver15).|  
 |Column Encryption Setting|disabled|Enables or disables [Always Encrypted](/sql/relational-databases/security/encryption/always-encrypted-database-engine) functionality for the connection. Supported values are: `enabled` and `disabled`|  
 |Command Timeout|30|The default wait time (in seconds) before terminating the attempt to execute a command and generating an error.<br /><br /> Valid values are greater than or equal to 0 and less than or equal to 2147483647.|  
-|Connect Retry Count<br /><br /> -or-<br /><br />ConnectRetryCount|1|Controls the number of reconnection attempts after the client identifies an idle connection failure. Valid values are 0 to 255. The default is 1. 0 means do not attempt to reconnect (disable connection resiliency).<br /><br /> For additional information about idle connection resiliency, see[.NET SqlConnection parameters for connection retry](https://learn.microsoft.com/azure/azure-sql/database/troubleshoot-common-connectivity-issues?view=azuresql#net-sqlconnection-parameters-for-connection-retry) and [Technical Article - Idle Connection Resiliency](https://go.microsoft.com/fwlink/?LinkId=393996).|  
+|Connect Retry Count<br /><br /> -or-<br /><br />ConnectRetryCount|1|Controls the number of reconnection attempts after the client identifies an idle connection failure. Valid values are 0 to 255. 0 means do not attempt to reconnect (disable connection resiliency).<br /><br /> Note: Since version 5.x the default value for non Azure endpoints is 1. For Azure SQL endpoints, the default is 2. For Azure SQL serverless or on demand endpoints, the default is 5 to improve connection success for connections to an idle or paused instance.<br /><br /> For additional information about idle connection resiliency, see [.NET SqlConnection parameters for connection retry](https://learn.microsoft.com/azure/azure-sql/database/troubleshoot-common-connectivity-issues?view=azuresql#net-sqlconnection-parameters-for-connection-retry) and [Technical Article - Idle Connection Resiliency](https://go.microsoft.com/fwlink/?LinkId=393996).|  
 |Connect Retry Interval<br /><br /> -or-<br /><br />ConnectRetryInterval|10|Specifies the time between each connection retry attempt (`ConnectRetryCount`). Valid values are 1 to 60 seconds (default=10), applied after the first reconnection attempt. When a broken connection is detected, the client immediately attempts to reconnect; this is the first reconnection attempt and only occurs if `ConnectRetryCount` is greater than 0. If the first reconnection attempt fails and `ConnectRetryCount` is greater than 1, the client waits `ConnectRetryInterval` to try the second and subsequent reconnection attempts.<br /><br /> For additional information about idle connection resiliency, see[.NET SqlConnection parameters for connection retry](https://learn.microsoft.com/azure/azure-sql/database/troubleshoot-common-connectivity-issues?view=azuresql#net-sqlconnection-parameters-for-connection-retry) and [Technical Article - Idle Connection Resiliency](https://go.microsoft.com/fwlink/?LinkId=393996).|  
 |Connect Timeout<br /><br /> -or-<br /><br /> Connection Timeout<br /><br /> -or-<br /><br /> Timeout|15|The length of time (in seconds) to wait for a connection to the server before terminating the attempt and generating an error.<br /><br /> Valid values are greater than or equal to 0 and less than or equal to 2147483647.<br /><br /> When opening a connection to a Azure SQL Database, set the connection timeout to 30 seconds.|  
 |Current Language<br /><br /> -or-<br /><br /> Language|N/A|Sets the language used for database server warning or error messages.<br /><br /> The language name can be 128 characters or less.|  

doc/snippets/Microsoft.Data.SqlClient/SqlConnectionStringBuilder.xml

@@ -247,15 +247,18 @@ For more information, see [Using Azure Active Directory authentication with SqlC
             </remarks>
         </ConnectionReset>
         <ConnectRetryCount>
-            <summary>The number of reconnections attempted after identifying that there was an idle connection failure. This must be an integer between 0 and 255. Default is 1. Set to 0 to disable reconnecting on idle connection failures. An <see cref="T:System.ArgumentException" /> will be thrown if set to a value outside of the allowed range.</summary>
+            <summary>The number of reconnections attempted after identifying that there was an idle connection failure. This must be an integer between 0 and 255. The default value for non Azure endpoints is 1. For Azure SQL endpoints, the default is 2. Starting in version 5.x, for Azure SQL serverless or on demand endpoints, the default is 5 to improve connection success for connections to an idle or paused instance. Set to 0 to disable reconnecting on idle connection failures. An <see cref="T:System.ArgumentException" /> will be thrown if set to a value outside of the allowed range.</summary>
             <value>The number of reconnections attempted after identifying that there was an idle connection failure.</value>
             <remarks>
               <format type="text/markdown">
                 <![CDATA[  
   
-  ## Remarks  
-   This property corresponds to the "Connect Retry Count" key within the <xref:Microsoft.Data.SqlClient.SqlConnection> connection string.
-  
+## Remarks  
+ This property corresponds to the "Connect Retry Count" key within the <xref:Microsoft.Data.SqlClient.SqlConnection> connection string.
+
+> [!NOTE]
+> Since version 5.x the default value for none Azure endpoints is 1 and for Azure SQL and Azure Synapse has increased to 2 and 5 to imporve the recovery against on high demand Azure endpoints. It should be detected first, and Synapse could be detected as a regular Azure SQL DB endpoint.
+
    ]]>
               </format>
             </remarks>