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Archive for October, 2015

If you are familiar with the new feature Read-Only Routing introduced in SQL Server 2012 with AlwaysOn then you should keep this script handy to generate URLs to be used in Read-Only Routing configuration instead of typing down yourself to limit any errors.

Connect to each replica in your AlwaysOn Availability Group and run the below script to get the read_only_routing_url for that replica.
Then copy the URL from the result set and use it when setting up read_only_routing_url. Find more details on that here

PRINT 'Read-only-routing url script v.2012.1.24.1'
 
PRINT 'This SQL Server instance version is [' + cast(serverproperty('ProductVersion') as varchar(256)) + ']'
 
IF (ServerProperty('IsClustered') = 1) 
BEGIN
    PRINT 'This SQL Server instance is a clustered SQL Server instance.'
END
ELSE
BEGIN
    PRINT 'This SQL Server instance is a stANDard (not clustered) SQL Server instance.'   
END
 
IF (ServerProperty('IsHadrEnabled') = 1) 
BEGIN
    PRINT 'This SQL Server instance is enabled for AlwaysOn.'
END
ELSE
BEGIN
    PRINT 'This SQL Server instance is NOT enabled for AlwaysOn.'
END
 
-- Detect SQL Azure instance. 
DECLARE @is_sql_azure bit
SET @is_sql_azure = 0
 
BEGIN try 
    SET @is_sql_azure = 1 
    EXEC('DECLARE @i int SET @i = sql_connection_mode()') 
    PRINT 'This SQL Server instance is a Sql Azure instance.'
END try 
BEGIN catch 
    SET @is_sql_azure = 0 
    PRINT 'This SQL Server instance is NOT a Sql Azure instance.'
END catch
 
-- Check that this is SQL 11 or later, otherwise fail fast. 
IF (@@microsoftversion / 0x01000000 < 11 or @is_sql_azure > 0) 
BEGIN
    PRINT 'This SQL Server instance does not support read-only routing, exiting script.'
END
ELSE
BEGIN -- IF server supports read-only routing
 
    -- Fetch the dedicated admin connection (dac) port. 
    -- Normally it's always port 1434, but to be safe here we fetch it FROM the instance. 
    -- We use this later to exclude the admin port FROM read_only_routing_url. 
    DECLARE @dac_port int
    DECLARE @reg_value varchar(255) 
    EXEC xp_instance_regread 
        N'HKEY_LOCAL_MACHINE', 
        N'SOFTWARE\Microsoft\Microsoft SQL Server\\MSSQLServer\SuperSocketNetLib\AdminConnection\Tcp', 
        N'TcpDynamicPorts', 
        @reg_value output
 
    SET @dac_port = cast(@reg_value as int)
 
    PRINT 'This SQL Server instance DAC (dedicated admin) port is ' + cast(@dac_port as varchar(255)) 
    IF (@dac_port = 0) 
    BEGIN 
        PRINT 'Note a DAC port of zero means the dedicated admin port is not enabled.' 
    END
 
    -- Fetch ListenOnAllIPs value. 
    -- IF SET to 1, this means the instance is listening to all IP addresses. 
    -- IF SET to 0, this means the instance is listening to specIFic IP addresses. 
    DECLARE @listen_all int 
    EXEC xp_instance_regread 
        N'HKEY_LOCAL_MACHINE', 
        N'SOFTWARE\Microsoft\Microsoft SQL Server\\MSSQLServer\SuperSocketNetLib\Tcp', 
        N'ListenOnAllIPs', 
        @listen_all output
 
    IF (@listen_all = 1) 
    BEGIN 
        PRINT 'This SQL Server instance is listening to all IP addresses (default mode).' 
    END 
    ELSE 
    BEGIN 
        PRINT 'This SQL Server instance is listening to specIFic IP addresses (ListenOnAllIPs is disabled).' 
    END
 
    -- Check for dynamic port configuration, not recommended with read-only routing. 
    DECLARE @tcp_dynamic_ports varchar(255) 
    EXEC xp_instance_regread 
        N'HKEY_LOCAL_MACHINE', 
        N'SOFTWARE\Microsoft\Microsoft SQL Server\\MSSQLServer\SuperSocketNetLib\Tcp\IPAll', 
        N'TcpDynamicPorts', 
        @tcp_dynamic_ports output
 
    IF (@tcp_dynamic_ports = '0') 
    BEGIN 
        PRINT 'This SQL Server instance is listening on a dynamic tcp port, this is NOT A RECOMMENDED CONFIGURATION when using read-only routing, because the instance port can change each time the instance is restarted.' 
    END 
 ELSE 
    BEGIN 
        PRINT 'This SQL Server instance is listening on fixed tcp port(s) (it is not configured for dynamic ports), this is a recommended configuration when using read-only routing.' 
    END
 
    -- Calculate the server domain AND instance FQDN. 
    -- We use @server_domain later to build the FQDN to the clustered instance. 
    DECLARE @instance_fqdn varchar(255) 
    DECLARE @server_domain varchar(255)
 
    -- Get the instance FQDN using the xp_getnetname API 
    -- Note all cluster nodes must be in same domain, so this works for calculating cluster FQDN. 
    SET @instance_fqdn = '' 
		EXEC xp_getnetname @instance_fqdn output, 1 
 
    -- Remove embedded null character at END IF found. 
    DECLARE @terminator int 
		SET @terminator = charindex(char(0), @instance_fqdn) - 1 
			 IF (@terminator > 0) 
		BEGIN 
			SET @instance_fqdn = substring(@instance_fqdn, 1, @terminator) 
		END
     -- Build @server_domain using @instance_fqdn. 
		 SET @server_domain = @instance_fqdn
     -- Remove trailing portion to extract domain name. 
		 SET @terminator = charindex('.', @server_domain) 
    IF (@terminator > 0) 
		 BEGIN 
			SET @server_domain = substring(@server_domain, @terminator+1, datalength(@server_domain)) 
		 END 
    PRINT 'This SQL Server instance resides in domain ''' +  @server_domain + ''''
 
    IF (ServerProperty('IsClustered') = 1) 
    BEGIN 
        -- Fetch machine name, which for a clustered SQL instance returns the network name of the virtual server. 
        -- AppEND @server_domain to build the FQDN. 
        SET @instance_fqdn = cast(serverproperty('MachineName') as varchar(255)) + '.' + @server_domain 
    END
 
    DECLARE @ror_url varchar(255) 
    DECLARE @instance_port int
 
    SET @ror_url = '' 
    -- Get first available port for instance. 
    SELECT TOP 1    -- SELECT first matching port 
    @instance_port = port 
    FROM sys.dm_tcp_listener_states 
    WHERE type=0 -- Type 0 = TSQL (to avoid mirroring ENDpoint) 
    AND state=0    --  State 0 is online    
    AND port <> @dac_port -- Avoid DAC port (admin port) 
    AND 
    -- Avoid availability GROUP listeners 
    ip_address not in (SELECT ip_address FROM sys.availability_GROUP_listener_ip_addresses agls) 
    GROUP by port        
    ORDER BY port asc  -- Pick first port in ascENDing ORDER
 
    -- Check IF there are multiple ports AND warn IF this is the case. 
    DECLARE @list_of_ports varchar(max) 
    SET @list_of_ports = ''
 
    SELECT 
    @list_of_ports = @list_of_ports + 
        case datalength(@list_of_ports) 
        when 0 then cast(port as varchar(max)) 
        ELSE ',' +  cast(port as varchar(max)) 
        END 
    FROM sys.dm_tcp_listener_states 
    WHERE type=0    --     Type 0 = TSQL (to avoid mirroring ENDpoint) 
    AND  state=0    --  State 0 is online    
    AND  port <> @dac_port -- Avoid DAC port (admin port) 
    AND 
    -- Avoid availability GROUP listeners 
    ip_address not in (SELECT ip_address FROM sys.availability_GROUP_listener_ip_addresses agls) 
    GROUP BY port        
    ORDER BY port asc
 
    PRINT 'This SQL Server instance FQDN (Fully QualIFied Domain Name) is ''' + @instance_fqdn + '''' 
    PRINT 'This SQL Server instance port is ' + cast(@instance_port as varchar(10))
 
    SET @ror_url = 'tcp://' + @instance_fqdn + ':' + cast(@instance_port as varchar(10))
 
    PRINT '****************************************************************************************************************' 
    PRINT 'The read_only_routing_url for this SQL Server instance is ''' + @ror_url + '''' 
    PRINT '****************************************************************************************************************'
 
    -- IF there is more than one instance port (unusual) list them out just in case. 
    IF (charindex(',', @list_of_ports) > 0) 
    BEGIN 
        PRINT 'Note there is more than one instance port, the list of available instance ports for read_only_routing_url is (' + @list_of_ports + ')' 
        PRINT 'The above URL just uses the first port in the list, but you can use any of these available ports.' 
    END
	END
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