oracle参数文件
欢迎进入Oracle社区论坛，与200万技术人员互动交流 >>进入 参数文件的相关问题。 一、查看数据库中参数值的方法 1、查看initsid.ora文件。 不提供所有参数；参数可能已经更改，文件中的参数值不是最新值(新值可能在spfile中，而initsid.ora文件中没有更新)。
欢迎进入Oracle社区论坛，与200万技术人员互动交流 >>进入
参数文件的相关问题。
一、查看数据库中参数值的方法
1、查看initsid.ora文件。
不提供所有参数；参数可能已经更改，文件中的参数值不是最新值(新值可能在spfile中，而initsid.ora文件中没有更新)。
2、查询视图V$PARAMETER。
可利用它来确定参数的默认值是否修改过，以及是否可以用alter system和alter session命令修改。
应该特别注意ISMODIFIED、ISDEFAULT、ISADJUSTED、ISSYS＿MODIFIABLE、ISSES＿MODIFIABLE列中的值。
3、使用SQL*Plus的show parameter。
二、设置参数的方法
1、修改initsid.ora文件。
可以修改所有的参数，必须关闭并重启实例才能生效。
2、使用alter system、alter system deferred和alter session命令。
不能修改所有参数，修改后可立即生效，并可保存到spfile或init文件中。
三、缺省情况下，Oracle9i启动时读取参数文件的顺序
重新启动数据库，使用startup命令，Oralce将会按照以下顺序在缺省目录中搜索参数文件：
a. spfile$.ora
缺省目录 UNIX: $/dbs/
NT: $/database
b. spfile.ora
缺省目录 UNIX: $/dbs/
NT: $/database
c. init$.ora
缺省目录 UNIX: $/dbs/
NT: $/database
or $/admin/db_name/pfile/
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
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
What to do if the oracle can't be opened
Apr 11, 2025 pm 10:06 PM
Solutions to Oracle cannot be opened include: 1. Start the database service; 2. Start the listener; 3. Check port conflicts; 4. Set environment variables correctly; 5. Make sure the firewall or antivirus software does not block the connection; 6. Check whether the server is closed; 7. Use RMAN to recover corrupt files; 8. Check whether the TNS service name is correct; 9. Check network connection; 10. Reinstall Oracle software.
How to solve the problem of closing oracle cursor
Apr 11, 2025 pm 10:18 PM
The method to solve the Oracle cursor closure problem includes: explicitly closing the cursor using the CLOSE statement. Declare the cursor in the FOR UPDATE clause so that it automatically closes after the scope is ended. Declare the cursor in the USING clause so that it automatically closes when the associated PL/SQL variable is closed. Use exception handling to ensure that the cursor is closed in any exception situation. Use the connection pool to automatically close the cursor. Disable automatic submission and delay cursor closing.
How to paginate oracle database
Apr 11, 2025 pm 08:42 PM
Oracle database paging uses ROWNUM pseudo-columns or FETCH statements to implement: ROWNUM pseudo-columns are used to filter results by row numbers and are suitable for complex queries. The FETCH statement is used to get the specified number of first rows and is suitable for simple queries.
How to create cursors in oracle loop
Apr 12, 2025 am 06:18 AM
In Oracle, the FOR LOOP loop can create cursors dynamically. The steps are: 1. Define the cursor type; 2. Create the loop; 3. Create the cursor dynamically; 4. Execute the cursor; 5. Close the cursor. Example: A cursor can be created cycle-by-circuit to display the names and salaries of the top 10 employees.
The PHP Community: Resources, Support, and Development
Apr 12, 2025 am 12:04 AM
The PHP community provides rich resources and support to help developers grow. 1) Resources include official documentation, tutorials, blogs and open source projects such as Laravel and Symfony. 2) Support can be obtained through StackOverflow, Reddit and Slack channels. 3) Development trends can be learned by following RFC. 4) Integration into the community can be achieved through active participation, contribution to code and learning sharing.
How to stop oracle database
Apr 12, 2025 am 06:12 AM
To stop an Oracle database, perform the following steps: 1. Connect to the database; 2. Shutdown immediately; 3. Shutdown abort completely.
How to create oracle dynamic sql
Apr 12, 2025 am 06:06 AM
SQL statements can be created and executed based on runtime input by using Oracle's dynamic SQL. The steps include: preparing an empty string variable to store dynamically generated SQL statements. Use the EXECUTE IMMEDIATE or PREPARE statement to compile and execute dynamic SQL statements. Use bind variable to pass user input or other dynamic values to dynamic SQL. Use EXECUTE IMMEDIATE or EXECUTE to execute dynamic SQL statements.
What steps are required to configure CentOS in HDFS
Apr 14, 2025 pm 06:42 PM
Building a Hadoop Distributed File System (HDFS) on a CentOS system requires multiple steps. This article provides a brief configuration guide. 1. Prepare to install JDK in the early stage: Install JavaDevelopmentKit (JDK) on all nodes, and the version must be compatible with Hadoop. The installation package can be downloaded from the Oracle official website. Environment variable configuration: Edit /etc/profile file, set Java and Hadoop environment variables, so that the system can find the installation path of JDK and Hadoop. 2. Security configuration: SSH password-free login to generate SSH key: Use the ssh-keygen command on each node
