什么是Oracle OTN?
欢迎进入Oracle社区论坛,与200万技术人员互动交流 >>进入 欢迎使用 OTN,Oracle 技术网。OTN 为那些需要使用 Oracle 产品和行业标准技术构建、测试和部署应用程序的开发人员提供服务和资源。 如果您是新用户,或要回顾基本内容,OTN 的 Oracle9i 示例系列将
欢迎进入Oracle社区论坛,与200万技术人员互动交流 >>进入
欢迎使用 OTN,Oracle 技术网。OTN 为那些需要使用 Oracle 产品和行业标准技术构建、测试和部署应用程序的开发人员提供服务和资源。
如果您是新用户,或要回顾基本内容,OTN 的 Oracle9i 示例系列将为您提供免费的在线课程,帮助您加快赶上。如果您要了解
Oracle Corporation(我们是什么样的公司,我们提供什么产品),可以从查看关于 Oracle页开始。有关 Oracle
所提供产品的概述,请参阅开始了解
Oracle.如果您已经做好了准备,开始用 Oracle 产品并为 Oracle 产品开发应用程序,可以以下列受欢迎的资源为切入点:
技术中心
有关涉及多个产品的技术信息,请访问技术中心页。使用该页作为学习
Java(包括 J2EE 和 EJB)、XML(包括 Oracle XDK)、Linux、Web Service、Windows
以及其他内容的切入点。
技术中心收集与特定技术相关的所有资源(下载内容、示例代码、教程、论坛、新闻和其他内容),您能快速找到所需要的最相关的信息。无论您是设计师、管理员、开发人员,还是新用户,您都可在某个
OTN 技术中心找到您所需要的内容。
产品
若要获得 Oracle 产品的技术信息,并了解它们的用处,请访问产品页。该页提供了指向
Oracle 产品主页的链接。
下载
OTN 最受欢迎的内容之一是下载页。从 OTN
可以下载 Oracle 产品、驱动程序和实用程序。(为了更加方便,您可订阅 OTN 技术产品线,我们将为您发送光盘。}软件下载免费,且每个软件都带有开发许可,允许您在开发应用程序和设计应用程序模型的过程中使用产品的全部版本。
若要出于开发许可允许之外的目的使用 OTN 软件,您必须购买完全使用的许可。您可随时从在线 Oracle
商店或通过您的 Oracle 销售代表购买带有完全使用许可的 Oracle 产品。
文档
若要学习如何使用 Oracle 产品,请访问文档页。该页为开发人员、系统管理员和最终用户提供指向通用手册和特定平台手册的链接。
示例代码
若要了解应用中的 Oracle 产品,请访问示例代码页。该页提供指向演示和示例应用程序的链接,您可以下载、运行和修改(如果您愿意)这些演示和示例程序,直接了解各种产品和技术的功能,以及充分利用许多强大的产品特性。
OTN 的社区代码站点为成员提供了一种途径在 OTN 上直接参与编码项目,以便学习新技术、分享专门技能并在此基础上构建应用。
培训与支持
当您需要特别帮助时,请访问支持页。本页提供链接指向
Oracle 的收费内容支持服务,包括 OTN 服务网和 Oracle MetaLink.
如果您想加强自己的技能组合或者证明自己在某个特定领域的能力,请访问培训与认证页。此处您将发现指向
Oracle 大学、Oracle 学习网以及 Oracle 认证计划等资源的链接。
OTN 还提供免费的论坛。OTN 成员、Oracle 开发人员和其他专家可以在这里交流思想和共享解决方案。

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Solutions to Oracle cannot be opened include: 1. Start the database service; 2. Start the listener; 3. Check port conflicts; 4. Set environment variables correctly; 5. Make sure the firewall or antivirus software does not block the connection; 6. Check whether the server is closed; 7. Use RMAN to recover corrupt files; 8. Check whether the TNS service name is correct; 9. Check network connection; 10. Reinstall Oracle software.

The method to solve the Oracle cursor closure problem includes: explicitly closing the cursor using the CLOSE statement. Declare the cursor in the FOR UPDATE clause so that it automatically closes after the scope is ended. Declare the cursor in the USING clause so that it automatically closes when the associated PL/SQL variable is closed. Use exception handling to ensure that the cursor is closed in any exception situation. Use the connection pool to automatically close the cursor. Disable automatic submission and delay cursor closing.

In Oracle, the FOR LOOP loop can create cursors dynamically. The steps are: 1. Define the cursor type; 2. Create the loop; 3. Create the cursor dynamically; 4. Execute the cursor; 5. Close the cursor. Example: A cursor can be created cycle-by-circuit to display the names and salaries of the top 10 employees.

The PHP community provides rich resources and support to help developers grow. 1) Resources include official documentation, tutorials, blogs and open source projects such as Laravel and Symfony. 2) Support can be obtained through StackOverflow, Reddit and Slack channels. 3) Development trends can be learned by following RFC. 4) Integration into the community can be achieved through active participation, contribution to code and learning sharing.

Oracle views can be exported through the EXP utility: Log in to the Oracle database. Start the EXP utility, specifying the view name and export directory. Enter export parameters, including target mode, file format, and tablespace. Start exporting. Verify the export using the impdp utility.

When Oracle log files are full, the following solutions can be adopted: 1) Clean old log files; 2) Increase the log file size; 3) Increase the log file group; 4) Set up automatic log management; 5) Reinitialize the database. Before implementing any solution, it is recommended to back up the database to prevent data loss.

Oracle is not only a database company, but also a leader in cloud computing and ERP systems. 1. Oracle provides comprehensive solutions from database to cloud services and ERP systems. 2. OracleCloud challenges AWS and Azure, providing IaaS, PaaS and SaaS services. 3. Oracle's ERP systems such as E-BusinessSuite and FusionApplications help enterprises optimize operations.

Building a Hadoop Distributed File System (HDFS) on a CentOS system requires multiple steps. This article provides a brief configuration guide. 1. Prepare to install JDK in the early stage: Install JavaDevelopmentKit (JDK) on all nodes, and the version must be compatible with Hadoop. The installation package can be downloaded from the Oracle official website. Environment variable configuration: Edit /etc/profile file, set Java and Hadoop environment variables, so that the system can find the installation path of JDK and Hadoop. 2. Security configuration: SSH password-free login to generate SSH key: Use the ssh-keygen command on each node
