修改share server参数导致数据库启动失败 在学习共享服务时,修改配置参数时,不小心犯了错误,呵呵,以下是修复过程。 1、修改 SQL alter system set dispatchers=(protocol=tcp)(dispatchers=2) scope=spfile; 不小心写成了 SQL alter system set dis
修改share server参数导致数据库启动失败
在学习共享服务时,修改配置参数时,不小心犯了错误,呵呵,以下是修复过程。
1、修改
SQL> alter system set dispatchers=‘(protocol=tcp)(dispatchers=2)’ scope=spfile;
不小心写成了
SQL> alter system set dispatchers=‘(protocol=tcp)9dispatchers=2)’ scope=spfile;
2、重启instance 时失败
SQL> startup force
提示:dipatchers 参数错误
启动失败,应该是spfile文件出现了错误,spfile是二进制文件不能用编辑器直接修改,所以想用init参数文件来启动
3、在$ORACLE_HOME/dbs 下却发现没有initorac.ora 文件
# strings spfileorac.ora > orac.txt
# vi orac.txt
# cp orac.txt initorac.ora
将9dispatchers=2) 改成 (dispatchers=2)
4、因为instance启动时先调用spfile,然后才是pfile ,所以
# mv spfileorac.ora spfileorac.ora.bak
5、然后再启动instance ,这时会从pfile来启动
SQL> startup nomount
SQL> alter database mount;
SQL> alter database open;
6、重新从pfile来生成spfile
SQL> create spfile from pfile ;
7、重启instance,查看启动参数文件信息
13:44:39 SYS@orac>startup
ORACLE instance started.
Total System Global Area 167772160 bytes
Fixed Size 1218316 bytes
Variable Size 71305460 bytes
Database Buffers 92274688 bytes
Redo Buffers 2973696 bytes
Database mounted.
Database opened.
13:45:05 SYS@orac>show parameter pfile;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
spfile string /u01/app/oracle/product/10.2.0
/db_1/dbs/spfileorac.ora
13:45:28 SYS@orac>select program from v$process;
至此,修复系统成功!

MySQL's position in databases and programming is very important. It is an open source relational database management system that is widely used in various application scenarios. 1) MySQL provides efficient data storage, organization and retrieval functions, supporting Web, mobile and enterprise-level systems. 2) It uses a client-server architecture, supports multiple storage engines and index optimization. 3) Basic usages include creating tables and inserting data, and advanced usages involve multi-table JOINs and complex queries. 4) Frequently asked questions such as SQL syntax errors and performance issues can be debugged through the EXPLAIN command and slow query log. 5) Performance optimization methods include rational use of indexes, optimized query and use of caches. Best practices include using transactions and PreparedStatemen

MySQL is suitable for small and large enterprises. 1) Small businesses can use MySQL for basic data management, such as storing customer information. 2) Large enterprises can use MySQL to process massive data and complex business logic to optimize query performance and transaction processing.

InnoDB effectively prevents phantom reading through Next-KeyLocking mechanism. 1) Next-KeyLocking combines row lock and gap lock to lock records and their gaps to prevent new records from being inserted. 2) In practical applications, by optimizing query and adjusting isolation levels, lock competition can be reduced and concurrency performance can be improved.

MySQL is not a programming language, but its query language SQL has the characteristics of a programming language: 1. SQL supports conditional judgment, loops and variable operations; 2. Through stored procedures, triggers and functions, users can perform complex logical operations in the database.

MySQL is an open source relational database management system, mainly used to store and retrieve data quickly and reliably. Its working principle includes client requests, query resolution, execution of queries and return results. Examples of usage include creating tables, inserting and querying data, and advanced features such as JOIN operations. Common errors involve SQL syntax, data types, and permissions, and optimization suggestions include the use of indexes, optimized queries, and partitioning of tables.

MySQL is an open source relational database management system suitable for data storage, management, query and security. 1. It supports a variety of operating systems and is widely used in Web applications and other fields. 2. Through the client-server architecture and different storage engines, MySQL processes data efficiently. 3. Basic usage includes creating databases and tables, inserting, querying and updating data. 4. Advanced usage involves complex queries and stored procedures. 5. Common errors can be debugged through the EXPLAIN statement. 6. Performance optimization includes the rational use of indexes and optimized query statements.

MySQL is chosen for its performance, reliability, ease of use, and community support. 1.MySQL provides efficient data storage and retrieval functions, supporting multiple data types and advanced query operations. 2. Adopt client-server architecture and multiple storage engines to support transaction and query optimization. 3. Easy to use, supports a variety of operating systems and programming languages. 4. Have strong community support and provide rich resources and solutions.

InnoDB's lock mechanisms include shared locks, exclusive locks, intention locks, record locks, gap locks and next key locks. 1. Shared lock allows transactions to read data without preventing other transactions from reading. 2. Exclusive lock prevents other transactions from reading and modifying data. 3. Intention lock optimizes lock efficiency. 4. Record lock lock index record. 5. Gap lock locks index recording gap. 6. The next key lock is a combination of record lock and gap lock to ensure data consistency.


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

WebStorm Mac version
Useful JavaScript development tools

Zend Studio 13.0.1
Powerful PHP integrated development environment

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software

Atom editor mac version download
The most popular open source editor

Dreamweaver CS6
Visual web development tools