一 启动和停止数据库1.启动数据库1.1 登录。XX-laptop:~$ sqlplus quot;scott/tiger as sysdbaquot;将出现如下连接数据库信息:
一 启动和停止数据库
1.启动数据库
1.1 登录。
XX-laptop:~$ sqlplus "scott/tiger as sysdba"
将出现如下连接数据库信息:
SQL*Plus: Release 10.2.0.1.0 - Production on Mon Aug 9 15:30:16 2010
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Connected to an idle instance.
SQL>
表明登录数据库系统成功。
1.2 启动数据库。运行 startup 命令启动数据库。
SQL> startup
ORACLE instance started.
Total System Global Area 603979776 bytes
Fixed Size 1220796 bytes
Variable Size 171970372 bytes
Database Buffers 423624704 bytes
Redo Buffers 7163904 bytes
Database mounted.
Database opened.
SQL>
表示数据库正常启动。
2.关闭数据库
2.1 登录。与1.1相同,不再赘述。
2.2 成功登录数据库系统后,运行 shudown 命令关闭数据库。
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
表明数据库已关闭。
二 启动和停止监听程序
Oracle 的监听程序主要是为客户端的连接提供接口,在控制台窗口键入如下命令:
1 启动监听程序。
注意:不是在sql中,,而是在bsh等中。
XX-laptop:~$ lsnrctl
将出现如下监听程序信息:
LSNRCTL for Linux: Version 10.2.0.1.0 - Production on 09-AUG-2010 15:37:47
Copyright (c) 1991, 2005, Oracle. All rights reserved.
Welcome to LSNRCTL, type "help" for information.
LSNRCTL> start
将出现监听程序的一系列启动和配置情况信息列表。信息行的最后一行是“The command completed successfully”字样时,监听程序启动成功。
2. 关闭 Oracle10g 监听程序 :运行 stop 命令关闭监听程序。
LSNRCTL> stop
信息行的最后一行是“The command completed successfully”字样时,监听程序停止成功。
=====================================================================
三 启动和停止iSQL*Plus。
1 启动iSQL*Plus。
XX-laptop:~$ isqlplusctl start
iSQL*Plus 10.2.0.1.0
Copyright (c) 2003, 2005, Oracle. All rights reserved.
Starting iSQL*Plus ...
iSQL*Plus started.
看到 iSQL*Plus started.表示iSQL*Plus启动成功。
2 关闭iSQL*Plus。
XX-laptop:~$ isqlplusctl stop
iSQL*Plus 10.2.0.1.0
Copyright (c) 2003, 2005, Oracle. All rights reserved.
Stopping iSQL*Plus ...
iSQL*Plus stopped.
看到 iSQL*Plus stopped.表示iSQL*Plus停止成功。
=====================================================================
四 使用企业管理器
1 启动控制台
XX-laptop:~$emctl start dbconsole
TZ set to PRC
Oracle Enterprise Manager 10g Database Control Release 10.2.0.1.0
Copyright (c) 1996, 2005 Oracle Corporation. All rights reserved.
:1158/em/console/aboutApplication
Starting Oracle Enterprise Manager 10g Database Control ......................... started.
------------------------------------------------------------------
Logs are generated in directory /opt/ora10/product/10.2.0/db_1/xhlh-laptop_openlab/sysman/log
表明启动成功。
2.停止控制台:
XX-laptop:~$ emctl stop dbconsole
TZ set to PRC
Oracle Enterprise Manager 10g Database Control Release 10.2.0.1.0
Copyright (c) 1996, 2005 Oracle Corporation. All rights reserved.
:1158/em/console/aboutApplication
Stopping Oracle Enterprise Manager 10g Database Control ...
... Stopped.
表明关闭成功。

The main role of MySQL in web applications is to store and manage data. 1.MySQL efficiently processes user information, product catalogs, transaction records and other data. 2. Through SQL query, developers can extract information from the database to generate dynamic content. 3.MySQL works based on the client-server model to ensure acceptable query speed.

The steps to build a MySQL database include: 1. Create a database and table, 2. Insert data, and 3. Conduct queries. First, use the CREATEDATABASE and CREATETABLE statements to create the database and table, then use the INSERTINTO statement to insert the data, and finally use the SELECT statement to query the data.

MySQL is suitable for beginners because it is easy to use and powerful. 1.MySQL is a relational database, and uses SQL for CRUD operations. 2. It is simple to install and requires the root user password to be configured. 3. Use INSERT, UPDATE, DELETE, and SELECT to perform data operations. 4. ORDERBY, WHERE and JOIN can be used for complex queries. 5. Debugging requires checking the syntax and use EXPLAIN to analyze the query. 6. Optimization suggestions include using indexes, choosing the right data type and good programming habits.

MySQL is suitable for beginners because: 1) easy to install and configure, 2) rich learning resources, 3) intuitive SQL syntax, 4) powerful tool support. Nevertheless, beginners need to overcome challenges such as database design, query optimization, security management, and data backup.

Yes,SQLisaprogramminglanguagespecializedfordatamanagement.1)It'sdeclarative,focusingonwhattoachieveratherthanhow.2)SQLisessentialforquerying,inserting,updating,anddeletingdatainrelationaldatabases.3)Whileuser-friendly,itrequiresoptimizationtoavoidper

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.


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