Connection pool fail

Question

Hi, guys
I use instant client 11.2.0.3.0 OCCI to create a connection pool, when create a connection from pool, it supposed using the existing connection, but the code created anohter new connection to database, any ideas? appreciate your help.
client side is running on Windows 7 32 bit, Database server is 10.2.05 on Solaris 10, development tool is MS VS 2010
here is the code:
Environment *env;
Connection *conn;
Statement *stmt;
string sqlStmt;
env = Environment::createEnvironment (Environment::THREADED_MUTEXED);
const string poolUserName = "scott";
const string poolPassword = "1234";
const string connectString = "192.168.0.70/orcl";
const string username = "scott";
const string passWord = "1234";
unsigned int maxConn =5;
unsigned int minConn = 2;
unsigned int incrConn = 1;
ConnectionPool *connPool = env->createConnectionPool(poolUserName, poolPassword, connectString, minConn, maxConn, incrConn);
try{
if (connPool)
cout << "SUCCESS - createConnectionPool" << endl;
else
cout << "FAILURE - createConnectionPool" << endl;
conn = connPool->createConnection (username, passWord); _// after this code, connection increase to 3 from 2._*
if (conn)
cout << "SUCCESS - createConnection" << endl;
else
cout << "FAILURE - createConnection" << endl;
}catch(SQLException ex)
cout<<"Exception thrown for createConnectionPool"<<endl;
cout<<"Error number: "<< ex.getErrorCode() << endl;
cout<<ex.getMessage() << endl;
......

Answer 1

Hi Nicolas,
Have you tried to turn on testOnReserve setting of the coneection pool?
Regards,
"Nicolas Devos" <[email protected]> wrote in message
news:3c5fa916$[email protected]..
>
Hi,
I am using weblogic 6.1 and oracle 8.1.6, and experiences
problems with connections pools and database crash.
When the database server crashes during an EJB transactions,
the connection used by that transaction seems to be lost and
is never rebuilt when the database server restarts, therefore
the number of connections within the pool shrinks thoroughly
if I have several connections used while the database crashes
or is shutdown for maintenance.
If this db crash takes time to recover, all connections
are destroyed and the pool become unusable.
As soon as all connections have been 'destroyed' I have
the following exception:
'connection pool - none available' when trying to get
a connection.
When I restart the database server, the pool does not rebuilt
itself.
(I am using a test table to test the presence of the database
with a frequency set to 60s)
I did the same operation without EJB transactions and the pool
could rebuilt itself after the database has been restarted.
I had that problem with weblogic 6.0 already and in the
release notes of 6.0_sp2, 2 issues are fixed concerning
the pool fail-over: 044223 and 041793.
I would like to know if these issues are fixed in 6.1 as well,
and if they are related to my problem (Their description is
quite short).
Thank you
Nicolas