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Resolved Use MultiSubnetFailover - SQL connection string

  1. How-to
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  1. galina buslovich
    galina buslovich
  2. PowerBuilder
  3. Wednesday, 22 February 2023 17:03 PM UTC

MultiSubnetFailover is ignored when added to DBParm string.

We are trying to connect PowerBuilder 2021 application running on AppStream to AWS sql server - SQL 2016.

Roughly doing:

DBMS=MSO

SQLCA.DBParm = ls_dbparm + ",MultiSubnetFailover=true" 

Any suggestion on how to make it work?

  1. Amazon AWS
  2. PowerBuilder
  3. SQL Server
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Responses (4)
Miguel Leeuwe
Miguel Leeuwe Accepted Answer Pending Moderation
  1. Tuesday, 7 March 2023 20:43 PM UTC
  2. PowerBuilder
  3. # 1

Hmm, I just noticed the strangest thing on :

https://learn.microsoft.com/en-us/sql/connect/oledb/applications/using-connection-string-keywords-with-oledb-driver-for-sql-server?view=sql-server-ver16
On that page, I do a search on all occurrences of "MultiSubnetFailover" and I find either a value true/false or yes/no:

Seems to depend on whether you use "IDBInitialize" or "IDataInitialize". Consistency would have been nice or maybe it's simply the documentation not being correct.

regards.

 

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Armeen Mazda @Appeon
Armeen Mazda @Appeon Accepted Answer Pending Moderation
  1. Tuesday, 7 March 2023 20:08 PM UTC
  2. PowerBuilder
  3. # 2

Are you using the new MSOLEDBSQL driver?  The SNC driver might not support the newer SQL Server features.

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John Fauss
John Fauss Accepted Answer Pending Moderation
  1. Tuesday, 7 March 2023 19:00 PM UTC
  2. PowerBuilder
  3. # 3

Are you sure you set this option to "true"? It appears from the following URL that you should instead specify "yes":

https://learn.microsoft.com/en-us/sql/relational-databases/native-client/features/sql-server-native-client-support-for-high-availability-disaster-recovery?view=sql-server-ver16#connecting-with-multisubnetfailover

It may be worth looking into?

Best regards, John

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Arnd Schmidt
Arnd Schmidt Accepted Answer Pending Moderation
  1. Wednesday, 22 February 2023 17:48 PM UTC
  2. PowerBuilder
  3. # 4

Are you 100 % sure that you make it as a part of the ProviderString? (Single quote at the end).

SQLCA.DBParm = "ProviderString='blabla=bla,MultiSubnetFailover=true'"

hth

Arnd

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RamanaRao Nandigam
  1. RamanaRao Nandigam
  2. Tuesday, 7 March 2023 17:05 PM UTC
Arnd Schmidt



I didn't get any error for adding MultiSubnetFailover=true. But, the MultiSubnetFailover=true property not working. Does this property really support PB2021?
  1. Helpful
Arnd Schmidt
  1. Arnd Schmidt
  2. Tuesday, 7 March 2023 17:58 PM UTC
I do not know how your ls_dbparm looks like and believe that PowerBuilder fails silently on using "wrong typed" parameters.



Your DBParm String can be something like this:

SQLCA.DBParm = "Database='myDatabase',TrustedConnection=1,ProviderString='MultiSubnetFailover=true'"



I would set the MultiSubnetFailover to be a part of the ProviderString (In the DB Dialog the "Extended Properties")

(https://www.connectionstrings.com/ole-db-driver-for-sql-server/)



You can also Connect by using only the ProviderString like:

SQLCA.DBParm = "ProviderString='Provider=MSOLEDBSQL;Server=<server>;Database=<database>;Integrated Security=SSPI;MultiSubnetFailover=true'"



So that no setting for SQLCA.ServerName property is needed.



hth

Arnd
  1. Helpful 1
Arnd Schmidt
  1. Arnd Schmidt
  2. Tuesday, 7 March 2023 20:30 PM UTC
John made a good response regarding that property.

In SQLClient it is a boolean property, but in the ProviderString documentations it is Yes/No.

(https://www.connectionstrings.com/ole-db-driver-for-sql-server/)

Try to use a ProviderString like:

SQLCA.DBParm = "ProviderString='Provider=MSOLEDBSQL;Server=<server>;Database=<database>;Integrated Security=SSPI;MultiSubnetFailover=Yes'"



hth



Arnd
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