simple query with null

  • Hi guys,

     

    what I am getting null , I should be getting 'NOTPRIMARY'

     

    select ' if cast(serverproperty(''machinename'') as nvarchar(20)) in ('+    stuff((
    SELECT ', N''' +
    CASE WHEN (CS.replica_server_name IS NULL OR CS.replica_server_name ='' OR CS.replica_server_name=NULL) THEN N'NOTPRIMARY' ELSE CS.replica_server_name END

    + '''' --, CS.join_state_desc, RS.role_desc, RS.operational_state_desc, RS.connected_state_desc, RS.synchronization_health_desc
    FROM sys.availability_groups_cluster AS C
    INNER JOIN sys.dm_hadr_availability_replica_cluster_states AS CS
    ON CS.group_id = C.group_id
    INNER JOIN sys.dm_hadr_availability_replica_states AS RS
    ON RS.replica_id = CS.replica_id
    where role_desc= 'SECONDARY' AND C.name ='x'
    for xml path('')
    ),1,1,'') +') BEGIN ' + char(13) as '--chksvrs'

     

  • oh and run it on secondary node, thanks in advance

  • If you run just the inside part of the query, as follows, what result do you get:

    SELECT CASE
    WHEN
    (
    CS.replica_server_name IS NULL
    OR CS.replica_server_name = ''
    ) THEN
    N'NOTPRIMARY'
    ELSE
    CS.replica_server_name
    END
    FROM sys.availability_groups_cluster C
    INNER JOIN sys.dm_hadr_availability_replica_cluster_states CS
    ON CS.group_id = C.group_id
    INNER JOIN sys.dm_hadr_availability_replica_states RS
    ON RS.replica_id = CS.replica_id
    WHERE RS.role_desc = 'SECONDARY'
    AND C.name = 'x';

    I don't have HA configured, so cannot properly test.

    If you aren't happy single, you won't be happy in a relationship.

    Remember, happiness comes from guitars, not relationships.

  • the result is nothing, thnx

    Capture

  • is c.name really = to 'x'??  what does this return?

     

    SELECT CASE

    WHEN

    (

    CS.replica_server_name IS NULL

    OR CS.replica_server_name = ''

    ) THEN

    N'NOTPRIMARY'

    ELSE

    CS.replica_server_name

    END,

    c.name

    FROM sys.availability_groups_cluster C

    INNER JOIN sys.dm_hadr_availability_replica_cluster_states CS

    ON CS.group_id = C.group_id

    INNER JOIN sys.dm_hadr_availability_replica_states RS

    ON RS.replica_id = CS.replica_id

    WHERE RS.role_desc = 'SECONDARY'

    --AND C.name = 'x'

    ;

    • This reply was modified 3 days ago by  Mike01.

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  • OK, so now you understand why you did not get 'NOTPRIMARY', I assume?

    If you aren't happy single, you won't be happy in a relationship.

    Remember, happiness comes from guitars, not relationships.

  • i got it, thnx

  • x= alwayson group name.

    the query is to return list of Secondary replicas for specific ag , if you run on secondary it should return none for the said AG

     

  • As an aside, as you're using SS 2019, I suggest you start using STRING_AGG() rather than the legacy FOR XML PATH method.

    Makes your code much easier to read.

    If you aren't happy single, you won't be happy in a relationship.

    Remember, happiness comes from guitars, not relationships.

  • Thanks for your help and advise.

  • This was removed by the editor as SPAM

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