本文章总结了大多数网友在使用orace数据库是出现的一个客户端连接时报ORA-01019错误收集总结，有需要的朋友可参考一下。
本文章总结了大多数网友在使用orace数据库是出现的一个客户端连接时报ORA-01019错误收集总结，有需要的朋友可参考一下。在.net+oracle开发中,发布web程序的时候,有是会遇到该错误 ora-01019
ORA-01019 unable to allocate memory in the user side
Cause: The user side memory allocator returned an error.
Action: Increase the size of the process heap or switch to the old set of calls.
或者 错误,不能从进程获得上下文.
此错误是由于oracle或者microsoft的bug引起.(其实是,iis的访问权限的控制太高).
解决方法:
一:为ORACLE_HOME目录,添加network services 用户组的访问权限,并将权限继承到子目录.重启机器.
二:提高虚拟路径对应的应用程序池,执行用户的权限.(该方法本人认为对带来不安全因素)
令,本错误有时候提示是,需要安装oracle7.13版本客户端以上.解决方法同上.
问题二
在Win8企业版64位环境下，连接Oracle11g 服务端，搞了整整两天，特将过程分享出来，供有需要的同学参考。
本机环境：
1、服务端：Oracle 11g R2 64位，安装路径E:/Org12
官方下载：http://www.oracle.com/technetwork/database/enterprise-edition/downloads/index.html
2、客户端：
（1）Instant Client ，轻量级，安装路径E:/Oracle11/client
http://www.oracle.com/technetwork/database/features/instant-client/index-097480.html
（2）32-bit Oracle Data Access Components (ODAC) with Oracle Developer Tools for Visual Studio,安装路径E:/Org12/Product/11.2.0/client_1
http://www.oracle.com/technetwork/topics/dotnet/utilsoft-086879.html?ssSourceSiteId=otncn
用客户端三种工具去连Oracle服务端，结果：
第一种：Oracle自带的SQL Deveploer工具，基本没问题！也不需要什么客户端配置。
http://www.oracle.com/technetwork/developer-tools/sql-developer/downloads/index.html
第二种，用PL/SQL 9.0去连，需要copy服务端的XXapporacleproduct11.2.0servernetworkADMINtnsnames.ORA文件到客户端（1）的networkADMIN下，并删除不需要的部分，保留内容大致如下：
| 代码如下 | 复制代码 |
| ORCL = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521)) ) (CONNECT_DATA = (SID =ORCL) ) ) |
|
并用如下方式启动PL/SQL
| 代码如下 | 复制代码 |
|
|
|
这个问题网上查找很久，尝试的解决方法很多，但最终我的方案是：
1、删除Oracle服务端；方法可以在网上搜，要删干净；
2、删除ODAC及所有组件；
3、保留Instant Client及其安装目录，主要是networkADMINtnsnames.ORA
4、重新安装Oracle服务端；
此时接所有客户端连接完全正常！
小结：
1、刚开始怀疑是64位Oracle驱动路径（x86）引起的bug，最后得出的结论是同一台机器，最好不要装两个Oracle客户端 ，服务端+客户端也不推荐，会引起一些潜在的问题，原因不明。
2、64位的Oracle服务端+32位的Oracle客户端，会有一些潜在的问题，最好32位对32位。
3、安装Oracle 11g R2 EX时，会在环境变量Path前面加上“e:Org12apporacleproduct11.2.0serverbin;;”，注意是两个分号，须删除一个；这个不知道是安装程序的BUG？
问题三
今天开发的同事碰到了这个ORA-1019错误。
详细的错误信息为：
Microsoft OLE DB Provider for ODBC Drivers错误'80004005'
[Microsoft][ODBC driver for Oracle][Oracle]Error while trying to retrieve text for error ORA-01019
/includes/data_func.asp，行12
而Oracle文档上对这个错误的描述为：
ORA-01019: unable to allocate memory in the user
Cause: The user side memory allocator returned error.
Action: Increase the processes heap size or switch to the old set of calls.
从错误描述上看，似乎是内存分配的问题，但是客户端服务器上的内存有2G，而且并没有启动什么程序，显然不是简单的内存不足的问题。
不过问题多半是出在客户端程序上，检查了一下metalink，发现文档ID 91906.1中提到的问题可能和当前类似。导致这个问题的原因似乎是ODBC没有使用Oracle提供的驱动程序，而是使用了ORACLE_HOME之外系统提供的驱动。
又通过GOOGLE搜索了一下，找到了一篇文章，其中包含下面的描述：
You must set the following environment variables:
ORACLE_HOME
Specifies the top-level directory in which Oracle is installed.
TNS_ADMIN
Specifies the location of configuration files, for example, $ORACLE_HOME/network/admin. After installation Oracle creates the configuration files under /var/opt/oracle. If listener.ora and tnsnames.ora are in this directory, you might not need to set TNS_ADMIN, because by default Oracle uses /var/opt/oracle.
If you do not set these environment variables properly, Oracle returns the ORA-1019 error code the first time you attempt to connect. For information on error handling,
看来问题很可能是由于没有正确设置ORACLE_HOME环境变量造成的，
解决办法
在WINDOWS中设置系统环境变量，重启系统后，问题消失。
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