Question

Is it possible to redirect a TNS declaration to another one?

For my current project, I require “flipping” from server to server in certain circumstances. To do this I use 3 TNS entries.

One to hold the TNS name that my application will connect to:

# application access to DB
DB =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.1)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = SAMPLENAME)
    )
  )

So that I can connect “manually” to either of the databases myself, I use 2 more TNS entries:

# Central_Server "Manual"
Central_Server =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.1)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = SAMPLENAME)
    )
  )

# Local "Manual"
Local =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 127.0.0.1)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = SAMPLENAME)
    )
  )

Rather than tweaking the TNS entry for DB all the time, is it possible to do something along the lines of?:

DB = Local

or

DB = Central_Server

Due to deployment strategy, I’d rather not implement this logic in my application directly.

Thanks 🙂

Answer 1

After all suggestions given, I found the easiest method was to remain with my manual “full” re-writing of the tnsnames.ora entries.