1、ORA-12541:TNS:没有监听器 原因:没有启动监听器或者监听器损坏。如果是前者,使用命令net start OracleOraHome81T
1、ORA-12541:TNS:没有监听器
原因:没有启动监听器或者监听器损坏。如果是前者,使用命令net start OracleOraHome81TNSListener(名字可能有出入)即可;
如果是后者,则使用“Net8 Configuration Assistant”工具向导之“监听程序配置”增加一个监听器即可(基本不用写任何信息,一路OK。在添加之前可能需要把所有的监听器先删除!)
2、ORA-12500:TNS:监听程序无法启动专用服务器进程
或
ORA-12560:TNS:协议适配器错误
原因:ORACLE的数据库服务没有启动。使用命令net start
ORACLESERVICEORADB(ORADB为数据库名字)即可。如果仍没有解决,
请继续向下看。
3、如果数据库服务启动失败,则很有可能是其注册表项值损坏,
最好的做法是以下两步:
1)ORADIM -DELETE -SID oradb 删除数据库服务项
2)ORADIM -NEW -SID oradb 新增数据库服务项
注:这个过程中如果出错,就重启计算机!
4、ORA-12154:TNS:能解析服务名
原因:ORACLE的网络服务名没有正确配置。请使用
Net8 Configuration Assistant”工具向导之“本地网络服务
名配置”配置TNS即可。如果仍没有解决,请继续向下看。
5、ORA-1034 :TNS:ORACLE不可用
原因:ORACLE的数据库服务正确启动,但是数据库没有打开!
使用命令:
1)svrmgrl 启动服务管理器
2)connect internal 以internal身份登陆
3)startup 打开数据库
6、ORA-12560:TNS:协议适配器错误(顽固性的)
原因:未知。
解决:必杀技--打开“Windows任务管理器”,杀死ORACLE.exe及ORADIM.exe进程,书写自己的ora_startup.bat,执行之!
PS:
1、我的ora_startup.bat:
net start OracleOraHome81TNSListener
net start ORACLESERVICEORADB
svrmgrl 一般情况下不用,不过有时少不了它的,,具体步骤见第5步。
2、我的ora_shutdown.bat:
net stop OracleOraHome81TNSListener
net stop ORACLESERVICEORADB
3、ORACLE相关服务名请参见“管理工具”之“服务”中以ORACLE开头的服务名。
用老办法command解决了。
具体如下:
执行:lsnrctl
然后start
接下来终于看到我的监听器启动了。

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

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.


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