RE: Perl DBI connection with RAC environment

  • From: Sanjay Mishra <smishra_97@xxxxxxxxx>
  • To: Peter McLarty <p.mclarty@xxxxxxxxxx>, oracle-l@xxxxxxxxxxxxx
  • Date: Thu, 5 Apr 2007 06:49:53 -0700 (PDT)

Thanks Peter for Detailed response

Peter McLarty <p.mclarty@xxxxxxxxxx> wrote:
        Yes thats it as you can sqlplus to the sansrv you can dbi to the sansrv 
I loose the host ip and let dbi find its way with tnsnames and let oracle Net 
do the work for me
  But if you have set up tnsname to have sansrv as a service with mumtliple 
hosts then you can specify the tnsnames entry for it and then you are in action 
as your tnsnames will have all nodes in its entry. 
  STUDD1 =
      (ADDRESS = (PROTOCOL = TCP)(HOST = host-vip)(PORT = 1521))
      (ADDRESS = (PROTOCOL = TCP)(HOST = bhost-vip)(PORT = 1521))
      (LOAD_BALANCE = yes)
        (TYPE = SELECT)
        (METHOD = BASIC)
        (RETRIES = 180)
        (DELAY = 5)
  With this the Oracle Net takes over working out which instance to connect to 
and if a node fails then load balancing simply relocates your connection to a 
new node
  I have this in a perl script for connecting and use the database name not the 
instance for the variable $_[0] this is used for an admin scripthence the / as 
  Seems to work relaibly although not been used in production
    my $dsn = "dbi:Oracle:$_[0]";
  my $dbh = DBI->connect( $dsn, '/', '',
  ora_session_mode => 2,
  RaiseError => 1,
  AutoCommit => 0


  From: Sanjay Mishra [mailto:smishra_97@xxxxxxxxx] 
Sent: Thursday, 5 April 2007 01:05 PM
To: Peter McLarty; oracle-l@xxxxxxxxxxxxx
Subject: RE: Perl DBI connection with RAC environment

  It means that If I have created a service on RAC as SANSRV where I had 
specified both node as preferred and TAF to SELECT. Now It means I can specify 
  Host - VIP of any of the RAC Node
  Please correct me if I am wrong
  The fish are biting.
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