Oracle数据库默认数据库监听与连接端口是1521, 但是有时候项目中需要更改默认端口,这样做很多时候客户要求,基于安全考虑. 以Ora
Oracle数据库默认数据库监听与连接端口是1521, 但是有时候项目中需要更改默认端口,,这样做很多时候客户要求,基于安全考虑. 以Oracle 11g 为例, 更改Listener的端口大致需要以下几步:
1. 通过命令行查看当前Listener的状态
c:\>lsnrctl status
执行以后,显示内容一般会告诉你,当前Listener与那些数据库实例相关联
2. 执行命令停止Oracle Listener服务
c:\>lsnrctl stop
执行该命令,停止Oracle监听服务,
3. 打开listener.ora与tnsnames.ora文件修改端口号,同时要在listener.ora文件
中加入SID注册内容如下:
SID_LIST_listener_name=
(SID_LIST=
(SID_DESC=
(GLOBAL_DBNAME=global_database_name)
(SID_NAME=sid)
(ORACLE_HOME=oracle_home))
(SID_DESC=...))
两个文件文件夹地址 - $ORACLE_HOME/network/admin/
保存修改以后的文件
4. 在windows命令行中执行
lsnrctl start
你会发现Oracle 监听服务重新启动, 并且关联到你指定的SID服务启动
5. 验证connection
c:\>sqlplus /nolog
SQL:\> connect system/manager@SID
如果出现成功连接字样,说明端口更改已经成功
注意点:
默认情况下listener.ora文件中没有包含静态注册服务Section内容
一定要手工加上,而且一定格式正确. 否则就会得到如下错误:
TNS-12560: TNS:protocol adapter error
TNS-00530: Protocol adapter error
这个时候一定记得检查修改的文件!!
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Linux-6-64下安装Oracle 12C笔记
在CentOS 6.4下安装Oracle 11gR2(x64)
Oracle 11gR2 在VMWare虚拟机中安装步骤
Debian 下 安装 Oracle 11g XE R2
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本文永久更新链接地址:

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InnoDB effectively prevents phantom reading through Next-KeyLocking mechanism. 1) Next-KeyLocking combines row lock and gap lock to lock records and their gaps to prevent new records from being inserted. 2) In practical applications, by optimizing query and adjusting isolation levels, lock competition can be reduced and concurrency performance can be improved.

MySQL is not a programming language, but its query language SQL has the characteristics of a programming language: 1. SQL supports conditional judgment, loops and variable operations; 2. Through stored procedures, triggers and functions, users can perform complex logical operations in the database.

MySQL is an open source relational database management system, mainly used to store and retrieve data quickly and reliably. Its working principle includes client requests, query resolution, execution of queries and return results. Examples of usage include creating tables, inserting and querying data, and advanced features such as JOIN operations. Common errors involve SQL syntax, data types, and permissions, and optimization suggestions include the use of indexes, optimized queries, and partitioning of tables.

MySQL is an open source relational database management system suitable for data storage, management, query and security. 1. It supports a variety of operating systems and is widely used in Web applications and other fields. 2. Through the client-server architecture and different storage engines, MySQL processes data efficiently. 3. Basic usage includes creating databases and tables, inserting, querying and updating data. 4. Advanced usage involves complex queries and stored procedures. 5. Common errors can be debugged through the EXPLAIN statement. 6. Performance optimization includes the rational use of indexes and optimized query statements.

MySQL is chosen for its performance, reliability, ease of use, and community support. 1.MySQL provides efficient data storage and retrieval functions, supporting multiple data types and advanced query operations. 2. Adopt client-server architecture and multiple storage engines to support transaction and query optimization. 3. Easy to use, supports a variety of operating systems and programming languages. 4. Have strong community support and provide rich resources and solutions.

InnoDB's lock mechanisms include shared locks, exclusive locks, intention locks, record locks, gap locks and next key locks. 1. Shared lock allows transactions to read data without preventing other transactions from reading. 2. Exclusive lock prevents other transactions from reading and modifying data. 3. Intention lock optimizes lock efficiency. 4. Record lock lock index record. 5. Gap lock locks index recording gap. 6. The next key lock is a combination of record lock and gap lock to ensure data consistency.


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