Set-SqlAvailabilityGroup

Sets settings on an availability group.

Syntax

Set-SqlAvailabilityGroup
   [-AutomatedBackupPreference <AvailabilityGroupAutomatedBackupPreference>]
   [-FailureConditionLevel <AvailabilityGroupFailureConditionLevel>]
   [-HealthCheckTimeout <Int32>]
   [-DatabaseHealthTrigger <Boolean>]
   [-RequiredSynchronizedSecondariesToCommit <Int32>]
   [[-Path] <String>]
   [-Script]
   [-AccessToken <PSObject>]
   [-TrustServerCertificate]
   [-HostNameInCertificate <String>]
   [-Encrypt <String>]
   [-ProgressAction <ActionPreference>]
   [-WhatIf]
   [-Confirm]
   [<CommonParameters>]
Set-SqlAvailabilityGroup
   [-AutomatedBackupPreference <AvailabilityGroupAutomatedBackupPreference>]
   [-FailureConditionLevel <AvailabilityGroupFailureConditionLevel>]
   [-HealthCheckTimeout <Int32>]
   [-DatabaseHealthTrigger <Boolean>]
   [-RequiredSynchronizedSecondariesToCommit <Int32>]
   [-InputObject] <AvailabilityGroup>
   [-Script]
   [-AccessToken <PSObject>]
   [-TrustServerCertificate]
   [-HostNameInCertificate <String>]
   [-Encrypt <String>]
   [-ProgressAction <ActionPreference>]
   [-WhatIf]
   [-Confirm]
   [<CommonParameters>]

Description

The Set-SqlAvailabilityGroup cmdlet modifies settings on an existing availability group in Always On Availability Groups. You can modify the automated backup preference, the failure condition level, and the health check timeout. You must run this cmdlet on the server instance that hosts the primary replica.

Examples

Example 1: Change the health check timeout period

PS C:\> Set-SqlAvailabilityGroup -Path "SQLSERVER:\Sql\PrimaryServer\InstanceName\AvailabilityGroups\MAinAG" -HealthCheckTimeout 120000

This command changes the health check timeout property on the availability group named MainAG to 120 seconds, or two minutes. If automatic failover is enabled, after this length of time, Always On Availability Groups initiates an automatic failover will be initiated.

Example 2: Change automated backup preference

PS C:\> Set-SqlAvailabilityGroup -Path "SQLSERVER:\Sql\PrimaryServer\InstanceName\AvailabilityGroups\MainAG" -AutomatedBackupPreference SecondaryOnly

This command changes the automated backup preference on the availability group named MainAG to be SecondaryOnly. Automated backups of databases in this availability group do not occur on the primary replica. Instead, automated backups occur on the secondary replica that has the highest backup priority.

Example 3: Change the failure condition level

PS C:\> Set-SqlAvailabilityGroup -Path "SQLSERVER:\Sql\PrimaryServer\InstanceName\AvailabilityGroups\MainAG" -FailureConditionLevel OnServerDown

This command changes the failure condition level on the availability group named MainAG to be OnServerDown. If the server instance that hosts the primary replica goes offline and if automatic failover is enabled, Always On Availability Groups starts an automatic failover.

Example 4: Change the number of `SYNCHRONOUS_COMMIT` secondaries that must be available for transactions to commit on the primary

# Get server and AG
PS C:\> CD 'SQLSERVER:\SQL\some-hostname\Default'
PS SQLSERVER:\SQL\some-hostname\Default> $server = Get-Item $PWD
PS SQLSERVER:\SQL\some-hostname\Default> $ag = $server.AvailabilityGroups[0]
# Alter AG with RequiredCopiesToCommit = 4
PS SQLSERVER:\SQL\some-hostname\Default> $ag | Set-SqlAvailabilityGroup -RequiredSynchronizedSecondariesToCommit 4

Note: an exception will be thrown if the -RequiredSynchronizedSecondariesToCommit parameter is used when
the target server version is SQL Server 2016 or lower.

Parameters

-AccessToken

The access token used to authenticate to SQL Server, as an alternative to user/password or Windows Authentication.

This can be used, for example, to connect to SQL Azure DB and SQL Azure Managed Instance using a Service Principal or a Managed Identity.

The parameter to use can be either a string representing the token or a PSAccessToken object as returned by running Get-AzAccessToken -ResourceUrl https://database.windows.net.

This parameter is new in v22 of the module.

Type:PSObject
Position:Named
Default value:None
Required:False
Accept pipeline input:False
Accept wildcard characters:False

-AutomatedBackupPreference

Specifies the automated backup preference for the availability group. The acceptable values for this parameter are:

  • Primary. Specifies that the backups always occur on the primary replica. This option supports the use of features not available when backup runs on a secondary replica, such as differential backups.
  • SecondaryOnly. Specifies that backups are never performed on primary replicas. If the primary replica is the only replica online, the backup does not occur.
  • Secondary. Specifies that backups occur on secondary replicas, unless the primary replica is the only replica online. Then the backup occurs on the primary replica.
  • None. Specifies that the primary or secondary status is not taken into account when deciding which replica performs backups. Instead, backup priority and online status determine which replica performs backups.
Type:AvailabilityGroupAutomatedBackupPreference
Accepted values:Primary, SecondaryOnly, Secondary, None, Unknown
Position:Named
Default value:None
Required:False
Accept pipeline input:False
Accept wildcard characters:False

-Confirm

Prompts you for confirmation before running the cmdlet.

Type:SwitchParameter
Aliases:cf
Position:Named
Default value:False
Required:False
Accept pipeline input:False
Accept wildcard characters:False

-DatabaseHealthTrigger

Specifies whether to trigger an automatic failover of the availability group if any user database replica within an availability group encounters a database failure condition.

Type:Boolean
Position:Named
Default value:None
Required:False
Accept pipeline input:False
Accept wildcard characters:False

-Encrypt

The encryption type to use when connecting to SQL Server.

This value maps to the Encrypt property SqlConnectionEncryptOption on the SqlConnection object of the Microsoft.Data.SqlClient driver.

In v22 of the module, the default is Optional (for compatibility with v21). In v23+ of the module, the default value will be 'Mandatory', which may create a breaking change for existing scripts.

This parameter is new in v22 of the module.

Type:String
Accepted values:Mandatory, Optional, Strict
Position:Named
Default value:None
Required:False
Accept pipeline input:False
Accept wildcard characters:False

-FailureConditionLevel

Specifies the automatic failover behavior of the availability group. The acceptable values for this parameter are:

  • OnServerDown. Failover or restart if the SQL Server service stops.
  • OnServerUnresponsive. Failover or restart if any condition of lower value is satisfied, plus when the SQL Server service is connected to the cluster and the HealthCheckTimeout threshold is exceeded, or if the availability replica currently in primary role is in a failed state.
  • OnCriticalServerError. Failover or restart if any condition of lower value is satisfied, plus when an internal critical server error occurs, which include out of memory condition, serious write-access violation, or too much dumping.
  • OnModerateServerError. Failover or restart if any condition of lower value is satisfied, plus if a moderate Server error occurs, wich includes persistent out of memory condition.
  • OnAnyQualifiedFailureConditions. Failover or restart if any condition of lower value is satisfied, plus if a qualifying failure condition occurs, which includes engine worker thread exhaustion and unsolvable deadlock detected.
Type:AvailabilityGroupFailureConditionLevel
Accepted values:OnServerDown, OnServerUnresponsive, OnCriticalServerErrors, OnModerateServerErrors, OnAnyQualifiedFailureCondition, Unknown
Position:Named
Default value:None
Required:False
Accept pipeline input:False
Accept wildcard characters:False

-HealthCheckTimeout

Specifies the length of time, in milliseconds, after which Always On Availability Groups declares an unresponsive server to be unhealthy.

Type:Int32
Position:Named
Default value:None
Required:False
Accept pipeline input:False
Accept wildcard characters:False

-HostNameInCertificate

The host name to be used in validating the SQL Server TLS/SSL certificate. You must pass this parameter if your SQL Server instance is enabled for Force Encryption and you want to connect to an instance using hostname/shortname. If this parameter is omitted then passing the Fully Qualified Domain Name (FQDN) to -ServerInstance is necessary to connect to a SQL Server instance enabled for Force Encryption.

This parameter is new in v22 of the module.

Type:String
Position:Named
Default value:None
Required:False
Accept pipeline input:False
Accept wildcard characters:False

-InputObject

Specifies the availability group, as an AvailabilityGroup object, that this cmdlet modifies.

Type:AvailabilityGroup
Position:1
Default value:None
Required:True
Accept pipeline input:True
Accept wildcard characters:False

-Path

Specifies the path of the availability database that cmdlet modifies. If you do not specify this parameter, this cmdlet uses current working location.

Type:String
Position:1
Default value:None
Required:False
Accept pipeline input:False
Accept wildcard characters:False

-ProgressAction

Determines how PowerShell responds to progress updates generated by a script, cmdlet, or provider, such as the progress bars generated by the Write-Progress cmdlet. The Write-Progress cmdlet creates progress bars that show a command's status.

Type:ActionPreference
Aliases:proga
Position:Named
Default value:None
Required:False
Accept pipeline input:False
Accept wildcard characters:False

-RequiredSynchronizedSecondariesToCommit

The number of synchronous commit secondaries that must be available to be able to commit on the primary.

If a SYNCHRONOUS_COMMIT secondary is disconnected from the primary for some time, the primary demotes it to ASYNCHRONOUS_COMMIT to avoid blocking commits. If the primary then becomes unavailable and the user wishes to fail over to one of these secondaries, they may incur data loss. By setting RequiredSynchronizedSecondariesToCommit to some number, the user can prevent the data loss since the primary will start blocking commits if too many secondaries are demoted to ASYNCHRONOUS_COMMIT.

The default value of this setting is 0, which means the primary will never block commits. This is identical to the behavior before SQL Server 2017.

Type:Int32
Position:Named
Default value:0
Required:False
Accept pipeline input:False
Accept wildcard characters:False

-Script

Indicates that this cmdlet returns a Transact-SQL script that performs the task that this cmdlet performs.

Type:SwitchParameter
Position:Named
Default value:None
Required:False
Accept pipeline input:False
Accept wildcard characters:False

-TrustServerCertificate

Indicates whether the channel will be encrypted while bypassing walking the certificate chain to validate trust.

In v22 of the module, the default is $true (for compatibility with v21). In v23+ of the module, the default value will be '$false', which may create a breaking change for existing scripts.

This parameter is new in v22 of the module.

Type:SwitchParameter
Position:Named
Default value:None
Required:False
Accept pipeline input:False
Accept wildcard characters:False

-WhatIf

Shows what would happen if the cmdlet runs. The cmdlet is not run.

Type:SwitchParameter
Aliases:wi
Position:Named
Default value:False
Required:False
Accept pipeline input:False
Accept wildcard characters:False

Inputs

Microsoft.SqlServer.Management.Smo.AvailabilityGroup