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下一个代码适用于即时客户端 10g,但在使用 oracle 即时客户端 11g 时挂起,挂在 pool.release(conN) 上,


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:我看了一下cx_Oracle源代码,网上的seesionpool.c

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

任何想法如何解决它?

PPS:操作系统 Windows XP 和 2008R2

4

2 回答 2

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。

于 2012-11-13T01:13:58.470 回答
1

我昨天也有同样的症状:在带有会话池的多线程应用程序中,有时释放会话会挂起长达 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 使用率过高且 OCISessionRelease 性能不佳(文档 ID 10157313.8)

错误 10157313:OCI 会话池增加 CPU 使用率并在使用 11.2 时需要很长时间才能释放

有关详细信息,请参阅 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。

于 2013-09-25T07:01:48.970 回答