DRCP with cx_Oracle doesn't seem to work as expected

I am trying to use DRCP Oracle 11.2 with a Python client using cx_Oracle 5.1.2.

If I create the connection by calling cx_Oracle.connect and adding a cclass argument and an argument of purity, then registration in sys.v_$ cpool_cc_stats with cclass_name set to my cclass show an increase in num_requests and num_misses for the number of calls I do with num_hits staying at 0.

connection = cx_Oracle.connect (user = db ['USER'], password = db ['PASSWORD'], dsn = db ['NAME'], cclass = db ['OPTIONS'] ['CCLASS'], cx_Oracle.ATTR_PURITY_SELF = purity)

However, if I create an instance of a cx_Oracle.SessionPool, then pass this instance in the same call to cx_Oracle.connect as an additional 'pool' argument, then num_misses goes up by 1 and num_hits goes up by num_requests - 1 (I guess this means that the first application is a new connection, all the rest are using this connection).

pool = cx_Oracle.SessionPool (user = db ['USER'], password DB ['PASSWORD'], dsn = db ['NAME'], min = 1, max = 2, increment = 1)

connection = cx_Oracle.connect (user DB ['USER'], password DB ['PASSWORD'], dsn = db ['NAME'], pool = pool, cclass is purity, db ['OPTIONS'] ['CCLASS'] = cx_Oracle.ATTR_PURITY_SELF)


Is this correct?  Should I create a SessionPool customer, then using them to acquire and release connections?

This article mentions nothing SessionPool.  I came across SessionPool in this post, but this is not the official documentation.

FWIW, when I run select * from dba_cpool_info, I get the following:

'CONNECTION_POOL '.'STATUS '."MINSIZE."MAXSIZE".'INCRSIZE '."SESSION_CACHED_CURSORS.'INACTIVITY_TIMEOUT '.'MAX_THINK_TIME '.'MAX_USE_SESSION '.'MAX_LIFETIME_SESSION '.
'SYS_DEFAULT_CONNECTION_POOL '.'ACTIVE '.44022030012050000086400

The first way to connect to drcp has a bug and fix is added soon.

The second connection using SessionPool shows expected results.

In both cases, the behavior should be the same. NUM_HITS is expected to increase and NUM_MISSES should not increase if purity itself and class connection is used to connect to the DB.

Tags: Database

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