EM页面出现乱码无法正常使用,重启EM服务时无法正常启动,报如下错误mdash;mdash;Oracle Enterprise Manager 10g Database Con
现像:
EM页面出现乱码无法正常使用,重启EM服务时无法正常启动,,报如下错误——
Oracle Enterprise Manager 10g Database Control Release 10.2.0.5.0 \par
Copyright (c) 1996, 2010 Oracle Corporation. All rights reserved.\par
https://hncjdb1:1158/em/console/aboutApplication\par
Starting Oracle Enterprise Manager 10g Database Control ........................\par
..................................................................... failed. \par
------------------------------------------------------------------\par
Logs are generated in directory /oracle/product/10.2.0/db_1/hncjdb1_eicdb1/sysman/log \par
……
检查$ORACLE_HOME/cfgtoollogs/emca/目录下的日志发现如下信息:
emagent.trc.N
2011-12-01 13:23:15 Thread-1594 ERROR http: 7: Unable to initialize ssl connection with server, aborting connection attempt
2011-12-01 13:23:15 Thread-1594 ERROR pingManager: nmepm_pingReposURL: Cannot connect tohttps://hncjdb1:1158/em/upload/: retStatus=-1
2011-12-01 13:23:21 Thread-1595 ERROR upload: Error in uploadXMLFiles. Trying again in 300.00 seconds.
2011-12-01 13:23:29 Thread-1596 ERROR ssl: nzos_Initialize failed, ret = 43061
emdctl.trc.N
2011-12-01 13:43:00 Thread-1 ERROR ssl: nmehlenv_openWallet failed
2011-12-01 13:43:00 Thread-1 ERROR http: 6: Unable to initialize ssl connection with server, aborting connection attempt
2011-12-01 13:44:00 Thread-1 ERROR ssl: Open wallet failed, ret = 28750
原因:
在用Enterprise Manager管理10.2.0.4和10.2.0.5版本的数据库时,因为“根证书用于安全通过安全套接字层(SSL)协议”已于2010年12月31日过期,如果客户在此之后尝试配置EM管理数据库,将导致如上错误。这个问题不影响现有的数据库控制配置。
解决办法:
打Patch 8350262补丁。具体请查阅 Metalink [ ID 1222603.1 ] 文档。

InnoDBBufferPool reduces disk I/O by caching data and indexing pages, improving database performance. Its working principle includes: 1. Data reading: Read data from BufferPool; 2. Data writing: After modifying the data, write to BufferPool and refresh it to disk regularly; 3. Cache management: Use the LRU algorithm to manage cache pages; 4. Reading mechanism: Load adjacent data pages in advance. By sizing the BufferPool and using multiple instances, database performance can be optimized.

Compared with other programming languages, MySQL is mainly used to store and manage data, while other languages such as Python, Java, and C are used for logical processing and application development. MySQL is known for its high performance, scalability and cross-platform support, suitable for data management needs, while other languages have advantages in their respective fields such as data analytics, enterprise applications, and system programming.

MySQL is worth learning because it is a powerful open source database management system suitable for data storage, management and analysis. 1) MySQL is a relational database that uses SQL to operate data and is suitable for structured data management. 2) The SQL language is the key to interacting with MySQL and supports CRUD operations. 3) The working principle of MySQL includes client/server architecture, storage engine and query optimizer. 4) Basic usage includes creating databases and tables, and advanced usage involves joining tables using JOIN. 5) Common errors include syntax errors and permission issues, and debugging skills include checking syntax and using EXPLAIN commands. 6) Performance optimization involves the use of indexes, optimization of SQL statements and regular maintenance of databases.

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


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

MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

Dreamweaver Mac version
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

WebStorm Mac version
Useful JavaScript development tools