Oracle 不同服务器数据库之间的访问 默认在本机操作 访问远程 *.*.*.*库
首页 → 数据库技术
背景:
阅读新闻
Oracle不同数据库通过database link访问
[日期:2011-10-18] 来源:Linux社区 作者:qingwangyoucao [字体:]
Oracle 不同服务器数据库之间的访问 默认在本机操作 访问远程 *.*.*.*库
1.创建数据库链接
示例:
CREATE PUBLIC DATABASE LINK orcl211 CONNECT TO 用户名identified by 密码 using '(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = *.*.*.*)(PORT = 1521))
)
(CONNECT_DATA =
(service_name=ORCL)
)
)';
参数对应描述:
CREATE PUBLIC DATABASE LINK 数据库链接名
CONNECT TO 用户名
identified by 密码
using '连接说明'
其中,连接说明必须为如下格式_也可取tnsnames.ora中配置的服务名,但要注意tnsnames.ora中也需满足下面格式,否则连接会不成功:
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = *.*.*.*)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME=ORCL服务名)
)
)
2.访问链接数据库中的对象的语法 如访问 orcl211中的edubur用户下的ts_staff_info
示例:
select * from edubur.ts_staff_info@orcl211;
参数对应描述:
select * from 用户名.表名@远程数据库链接名
3.查看所有已创建的数据库链接名
select owner, db_link from dba_db_links;
ower db_link
PUBLIC ORCL211.REGRESS.RDBMS.DEV.US.ORACLE.COM
4.删除数据库链接名
drop public DATABASE LINK ORCL211.REGRESS.RDBMS.DEV.US.ORACLE.COM
ArcGIS应用Oracle Spatial特征分析
Java调用Oracle存储过程教程
相关资讯 Oracle入门教程
图片资讯
本文评论 查看全部评论 (0)
评论声明
最新资讯
本周热门
Linux公社简介 - 广告服务 - 网站地图 - 帮助信息 - 联系我们
本站(LinuxIDC)所刊载文章不代表同意其说法或描述,仅为提供更多信息,,也不构成任何建议。
Copyright © 2006-2011 Linux公社 All rights reserved 浙ICP备06018118号

InnoDBBufferPool reduces disk I/O by caching data and indexing pages, improving database performance. Its working principle includes: 1. Data reading: Read data from BufferPool; 2. Data writing: After modifying the data, write to BufferPool and refresh it to disk regularly; 3. Cache management: Use the LRU algorithm to manage cache pages; 4. Reading mechanism: Load adjacent data pages in advance. By sizing the BufferPool and using multiple instances, database performance can be optimized.

Compared with other programming languages, MySQL is mainly used to store and manage data, while other languages such as Python, Java, and C are used for logical processing and application development. MySQL is known for its high performance, scalability and cross-platform support, suitable for data management needs, while other languages have advantages in their respective fields such as data analytics, enterprise applications, and system programming.

MySQL is worth learning because it is a powerful open source database management system suitable for data storage, management and analysis. 1) MySQL is a relational database that uses SQL to operate data and is suitable for structured data management. 2) The SQL language is the key to interacting with MySQL and supports CRUD operations. 3) The working principle of MySQL includes client/server architecture, storage engine and query optimizer. 4) Basic usage includes creating databases and tables, and advanced usage involves joining tables using JOIN. 5) Common errors include syntax errors and permission issues, and debugging skills include checking syntax and using EXPLAIN commands. 6) Performance optimization involves the use of indexes, optimization of SQL statements and regular maintenance of databases.

MySQL is suitable for beginners to learn database skills. 1. Install MySQL server and client tools. 2. Understand basic SQL queries, such as SELECT. 3. Master data operations: create tables, insert, update, and delete data. 4. Learn advanced skills: subquery and window functions. 5. Debugging and optimization: Check syntax, use indexes, avoid SELECT*, and use LIMIT.

MySQL efficiently manages structured data through table structure and SQL query, and implements inter-table relationships through foreign keys. 1. Define the data format and type when creating a table. 2. Use foreign keys to establish relationships between tables. 3. Improve performance through indexing and query optimization. 4. Regularly backup and monitor databases to ensure data security and performance optimization.

MySQL is an open source relational database management system that is widely used in Web development. Its key features include: 1. Supports multiple storage engines, such as InnoDB and MyISAM, suitable for different scenarios; 2. Provides master-slave replication functions to facilitate load balancing and data backup; 3. Improve query efficiency through query optimization and index use.

SQL is used to interact with MySQL database to realize data addition, deletion, modification, inspection and database design. 1) SQL performs data operations through SELECT, INSERT, UPDATE, DELETE statements; 2) Use CREATE, ALTER, DROP statements for database design and management; 3) Complex queries and data analysis are implemented through SQL to improve business decision-making efficiency.

The basic operations of MySQL include creating databases, tables, and using SQL to perform CRUD operations on data. 1. Create a database: CREATEDATABASEmy_first_db; 2. Create a table: CREATETABLEbooks(idINTAUTO_INCREMENTPRIMARYKEY, titleVARCHAR(100)NOTNULL, authorVARCHAR(100)NOTNULL, published_yearINT); 3. Insert data: INSERTINTObooks(title, author, published_year)VA


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Atom editor mac version download
The most popular open source editor

SublimeText3 Linux new version
SublimeText3 Linux latest version

SublimeText3 Mac version
God-level code editing software (SublimeText3)

SublimeText3 English version
Recommended: Win version, supports code prompts!

SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.