Question

我遇到python cx_Oracle模块的问题

通过现有游标重复执行查询（可能带有不同的参数）导致巨大的内存泄漏

附上了剥离的例子。

查询执行的两种变体 - mleak1和mleak2，有和没有准备工作方式相同

python3和python2

中同样存在问题

每次查询修复泄漏后重新打开游标

类似的postgres版本工作正常

这是cx_Oracle模块中的错误吗？

问题在两台完全不同的机器上重现

logname@machine1(ubuntu_16.04):~> python3
Python 3.5.2 (default, Nov 17 2016, 17:05:23) 
    [GCC 5.4.0 20160609] on linux
    Type "help", "copyright", "credits" or "license" for more information.
    >>> import cx_Oracle
    >>> cx_Oracle.__version__
    '6.0rc2'
    >>> 


[logname@machine2]$ python3
Python 3.5.1 (default, Oct 22 2016, 08:10:47) 
    [GCC 4.4.7 20120313 (Red Hat 4.4.7-17)] on linux
    Type "help", "copyright", "credits" or "license" for more information.
    >>> import cx_Oracle
    >>> cx_Oracle.__version__
    '6.0'
>>> 


<code><pre>
###############################################################
import cx_Oracle
import psycopg2

sql_text="select 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' from dual"
def mleak1(connect_string_ora ):
    with cx_Oracle.connect(connect_string_ora) as dbo:
        ora_cursor=dbo.cursor()


        for i in range(0,10000000):

            ora_cursor.execute(sql_text) 

            for r in ora_cursor:
                print (r) 

def mleak2(connect_string_ora ):
    with cx_Oracle.connect(connect_string_ora) as dbo:
        ora_cursor=dbo.cursor()

        ora_cursor.prepare(sql_text)
        for i in range(0,10000000):

            ora_cursor.execute(None) 

            for r in ora_cursor:
                print (r)

def no_mleak(connect_string_pg ):

    with psycopg2.connect(connect_string_pg) as dbp:
        pg_cursor=dbp.cursor()
        pg_cursor.execute("create table dual(f) as select 1")    #to mimics oracle sql text query

        for i in range(0,10000000):

            pg_cursor.execute(sql_text) 

            for r in pg_cursor:
                print (r) 

mleak1('scott/tiger')

#mleak2('scott/tiger')

#no_mleak('password=xxx dbname=mydb user=myuser')

</code></pre>

Answer 1

如果您怀疑cx_Oracle中存在错误，请在此处记录问题：https://github.com/oracle/python-cx_Oracle/issues。

我使用您的示例查看了代码，确实存在内存泄漏，我刚刚插入。谢谢你报告这个！

python cx_Oracle内存泄漏

1 个答案: