def METHOD_NAME(resource_group_name: Optional[str] = None,
                            sql_server_instance_name: Optional[str] = None,
                            opts: Optional[pulumi.InvokeOptions] = None) -> AwaitableGetSqlServerInstanceResult:
    """
    Retrieves a SQL Server Instance resource
    Azure REST API version: 2023-01-15-preview.
    :param str resource_group_name: The name of the Azure resource group
    :param str sql_server_instance_name: Name of SQL Server Instance
    """
    __args__ = dict()
    __args__['resourceGroupName'] = resource_group_name
    __args__['sqlServerInstanceName'] = sql_server_instance_name
    opts = pulumi.InvokeOptions.merge(_utilities.get_invoke_opts_defaults(), opts)
    __ret__ = pulumi.runtime.invoke('azure-native:azurearcdata:getSqlServerInstance', __args__, opts=opts, typ=GetSqlServerInstanceResult).value
    return AwaitableGetSqlServerInstanceResult(
        id=pulumi.get(__ret__, 'id'),
        location=pulumi.get(__ret__, 'location'),
        name=pulumi.get(__ret__, 'name'),
        properties=pulumi.get(__ret__, 'properties'),
        system_data=pulumi.get(__ret__, 'system_data'),
        tags=pulumi.get(__ret__, 'tags'),
        type=pulumi.get(__ret__, 'type'))