Tns Entries

Question

Hi All,
DB version is 11.2.0.2. Could see in the tns entry as below
    (CONNECT_DATA =
      (SERVICE_NAME = ME)
     (FAILOVER_MODE =
        (TYPE = SELECT)
        (METHOD = BASIC)
        (RETRIES = 180)
        (DELAY = 5) ))
)Was studying this document http://docs.oracle.com/cd/B28359_01/network.111/b28316/advcfg.htm in that 13.3.4 Failover_mode parameters
1. Type - which is ideal settings for TNS entries is that type Session or Select . In sessions new session is automatically created in failover. Am not getting that type select where it says 'users with open cursors continue fetching on them after failure'?
2. Retries & Delay - If retry is specified delay default to one second...so is that mentioning of delay is not required above?
thanks,
baskar.l

Answer 1

ype - which is ideal settings for TNS entries is that type Session or Select . In sessions new session is automatically created in failover. Am not getting that type select where it says 'users with open cursors continue fetching on them after failure'?I am not sure about the "ideal" but the meaning of Select would be that using the same session state, RAC would be able to run your query , from the another node , from the same point where the session got disconnected on the first node. In other words, if on node 1 , your query fetched 50 rows from an output of 100 rows in total and session got disconnected at 51st row, after the failover, the query would continue from the 51st row only from node 2.
Retries & Delay - If retry is specified delay default to one second...so is that mentioning of delay is not required above?After reading the doc it appears that either one of the two is needed, not both IMO.
HTH
Aman....