DRCP Data resident connection pooling

Question

Hi,
I have a quesiton form SR
Please confirm do you use DRCP "database resident connection pooling" ?
How do I determine if DRCP is enabled in my environment
Could someone help. This is urgent
Thanks,
Prasad

Answer 1

1. "select status from dba_cpool_info" (as SYSDBA)
If it is 'ACTIVE', it means the DRCP on the server is up.
Also, 'ps -ef | grep ora_l0', 'ps -ef |grep ora_n0' show you the pooled servers and connection brokers respectively
2. lsnrctl services
Instance "orcl11", status READY, has 2 handler(s) for this service...
Handler(s):
"N000" established:0 refused:0 current:0 max:5697 state:ready
CMON <machine: abc386, pid: 8468>
(ADDRESS=(PROTOCOL=tcp)(HOST=abc386.xyz.com)(PORT=28232))
"DEDICATED" established:70 refused:0 state:ready
LOCAL SERVER
Shows the DRCP has registered with the listener and is ready for taking requests.
3. Look at the connect string the application is using:
poolstr = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = abc386.xyz.com)(PORT = 1522))) (CONNECT_DATA = (SERVICE_NAME = orcl11)(SERVER=POOLED)))
4. While the application runs, see the DRCP stats: (as sysdba)
select num_requests, num_hits, num_misses, num_authentications from v$cpool_stats
a) if the num_requests is going up, the application is using the DRCP. Otherwise it is not.
b) If num_misses is going up and not the num_hits, DRCP is being used, but the pooled servers are not being reused. Please check for PURITY and CONNECTION_CLASS attributes.
For PHP, the purity is always SELF (reuse mode) and hence the num_hits should go up if oci_pconnect is repeated (for the same user from the same PHP.ini that has oci8.connection_class)
For OCI application, please check the attributes being used or not.
c) If NUM_AUTHENTICATIONS is going up, same as above. Please check the PURITY or if you are using oci_new_connect in PHP.
5. See the rows from v$cpool_conn_info for all the connections from the clients to DRCP. Check documentation.