SQL Server 2005 Express 访问 Oracle 10 EXEC master.dbo.sp_addlinkedserver @server = N'TESTLINK', @srvproduct=N'Oracle', @provider=N'MSDAORA', @datasrc=N'TEST' GO 这一句在 SQLServer 下创建一个数据库链接。 连接名为TESTLINK Oracle 数据源是 TE
SQL Server 2005 Express 访问 Oracle 10
EXEC master.dbo.sp_addlinkedserver
@server = N'TESTLINK',
@srvproduct=N'Oracle',
@provider=N'MSDAORA',
@datasrc=N'TEST'
GO
这一句在 SQLServer 下创建一个数据库链接。
连接名为TESTLINK
Oracle 数据源是 TEST
要求在SQL Server 的机器上面,安装有Oracle 的客户端。
那个Oracle 数据源,配置文件在
E:oracleproduct10.2.0client_1NETWORKADMIN
目录下。
内容为:
# tnsnames.ora Network Configuration File:E:oracleproduct10.2.0client_1networkadmintnsnames.ora
# Generated by Oracle configuration tools.
TEST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.210)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = ORCL)
)
)
注: 本机只安装了 SQL SERVER EXPRESS 与 Oracle 10 的客户端。
Oralce 10 服务器安装在 另外一台机器上。
EXEC
master.dbo.sp_addlinkedsrvlogin
@rmtsrvname = N'TEST',
@locallogin = NULL ,
@useself = N'False',
@rmtuser = N'test',
@rmtpassword = N'test123'
GO
这一句是设置默认用什么用户名/密码来访问Oracle 数据库。
上面的例子是用户名为test 密码为 test123
数据库链接创建完毕后,,可以尝试查询:
这里的TESTLINK..TEST.TEST_MAIN。
第一个TESTLINK是数据库链接名
第二个TEST 是Oracle 那里的Test 用户的方案名
TEST_MAIN 是Test 用户下的一个表。
1> select * from TESTLINK..TEST.TEST_MAIN;
2> go
ID VALUE
--------------------------------------------------
1 ONE
2 TWO
3 TWO
(3 行受影响)
注:假如创建链接完毕后,执行查询的时候,提示MSDAORA 找不到Oracle 客户端的话。如果本机安装的是Oracle 9 / 10 。那么有可能是权限的问题,需要额外在操作系统那里设置一下。
以本机为例子:
需要选择E:oracleproduct10.2.0client_1这个目录。
鼠标右键,弹出菜单中,选择“属性”。
然后在“安全”选项中,增加一个EveryOne 用户。并设置完全控制。
然后重新启动计算机。
重新启动完毕后,应该就正常了。

ACID attributes include atomicity, consistency, isolation and durability, and are the cornerstone of database design. 1. Atomicity ensures that the transaction is either completely successful or completely failed. 2. Consistency ensures that the database remains consistent before and after a transaction. 3. Isolation ensures that transactions do not interfere with each other. 4. Persistence ensures that data is permanently saved after transaction submission.

MySQL is not only a database management system (DBMS) but also closely related to programming languages. 1) As a DBMS, MySQL is used to store, organize and retrieve data, and optimizing indexes can improve query performance. 2) Combining SQL with programming languages, embedded in Python, using ORM tools such as SQLAlchemy can simplify operations. 3) Performance optimization includes indexing, querying, caching, library and table division and transaction management.

MySQL uses SQL commands to manage data. 1. Basic commands include SELECT, INSERT, UPDATE and DELETE. 2. Advanced usage involves JOIN, subquery and aggregate functions. 3. Common errors include syntax, logic and performance issues. 4. Optimization tips include using indexes, avoiding SELECT* and using LIMIT.

MySQL is an efficient relational database management system suitable for storing and managing data. Its advantages include high-performance queries, flexible transaction processing and rich data types. In practical applications, MySQL is often used in e-commerce platforms, social networks and content management systems, but attention should be paid to performance optimization, data security and scalability.

The relationship between SQL and MySQL is the relationship between standard languages and specific implementations. 1.SQL is a standard language used to manage and operate relational databases, allowing data addition, deletion, modification and query. 2.MySQL is a specific database management system that uses SQL as its operating language and provides efficient data storage and management.

InnoDB uses redologs and undologs to ensure data consistency and reliability. 1.redologs record data page modification to ensure crash recovery and transaction persistence. 2.undologs records the original data value and supports transaction rollback and MVCC.

Key metrics for EXPLAIN commands include type, key, rows, and Extra. 1) The type reflects the access type of the query. The higher the value, the higher the efficiency, such as const is better than ALL. 2) The key displays the index used, and NULL indicates no index. 3) rows estimates the number of scanned rows, affecting query performance. 4) Extra provides additional information, such as Usingfilesort prompts that it needs to be optimized.

Usingtemporary indicates that the need to create temporary tables in MySQL queries, which are commonly found in ORDERBY using DISTINCT, GROUPBY, or non-indexed columns. You can avoid the occurrence of indexes and rewrite queries and improve query performance. Specifically, when Usingtemporary appears in EXPLAIN output, it means that MySQL needs to create temporary tables to handle queries. This usually occurs when: 1) deduplication or grouping when using DISTINCT or GROUPBY; 2) sort when ORDERBY contains non-index columns; 3) use complex subquery or join operations. Optimization methods include: 1) ORDERBY and GROUPB


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

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

SublimeText3 Chinese version
Chinese version, very easy to use

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment

Zend Studio 13.0.1
Powerful PHP integrated development environment

MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.

Atom editor mac version download
The most popular open source editor