Question

下一代码可以正常使用即时客户端10g，但在使用oracle即时客户端11g时挂断，挂起在pool.release（conN），


import time
print '---------------------------------'
import cx_Oracle
print cx_Oracle.clientversion()
time.sleep(1)
pool = cx_Oracle.SessionPool('login', 'pass', "dbserver:1521/db", 1, 6, 2)
pool.timeout = 60
con11 = pool.acquire()
con12 = pool.acquire()
con13 = pool.acquire()
con14 = pool.acquire()
con15 = pool.acquire()
pool.release(con11)
pool.release(con12)
pool.release(con13)
pool.release(con14)
pool.release(con15)
for i in xrange(100000):
    print '-=-' + str(i) + '-=-'
    print str(pool.opened) + " " + str(pool.busy)
    con1 = pool.acquire()
    cursor = con1.cursor()
    cursor.execute("SELECT * FROM DUAL")
    count = cursor.fetchall()[0][0]
    cursor.close()
    print str(pool.opened) + " " + str(pool.busy)
    con2 = pool.acquire()
    cursor = con2.cursor()
    cursor.execute("SELECT * FROM DUAL")
    count = cursor.fetchall()[0][0]
    cursor.close()
    print str(pool.opened) + " " + str(pool.busy)
    con3 = pool.acquire()
    cursor = con3.cursor()
    cursor.execute("SELECT * FROM DUAL")
    count = cursor.fetchall()[0][0]
    cursor.close()
    print str(pool.opened) + " " + str(pool.busy)
    t1 = time.time()
    pool.release(con3)
    t2 = time.time()
    print t2 - t1
    print str(pool.opened) + " " + str(pool.busy)
    t1 = time.time()
    pool.release(con2)
    t2 = time.time()
    print t2 - t1
    t1 = time.time()
    pool.release(con1)
    t2 = time.time()
    print t2 - t1
    print str(pool.opened) + " " + str(pool.busy)
print '---------------------------------'

PS：我看一下cx_Oracle的源代码，它是在线上的seeionpool.c

    status = OCISessionRelease(connection->handle,
            connection->environment->errorHandle, NULL, 0, mode);

任何想法如何解决？

PPS：OS Windows XP和2008R2

Answer 1

http://cx-oracle.sourceforge.net/html/session_pool.html

注意此对象是DB API的扩展，仅在Oracle 9i中可用。

Answer 2

昨天我有同样的症状：在一个带有会话池的多线程应用程序中，有时释放会话会挂起最多2分钟。

您可能遇到以下Oracle错误之一：

错误10157313 - 使用OCI会话池时，CPU使用率过高，OCISessionRelease性能不佳（Doc ID 10157313.8）

错误10157313：OCI会话池增加CPU使用率并在使用11.2时花费更长时间

详见Oracle Metalink。

将Oracle客户端软件更新到11.2.0.3或更高版本（例如InstantClient 11.2.0.3）似乎有所帮助。

cx_Oracle + oracle即时客户端11g挂机

2 个答案: