Oracle is a widely used database system. When a failure occurs, you need to check the logs to help solve the problem. This article will introduce how to view Oracle logs to check database problems.
- View the database log file location
First you need to determine the database log file location. Oracle has three types of log files: Control Files, Log Files and Data Files. Log files are divided into online log files and archived log files. Online log files record running transactions, while archive log files record completed transactions.
You can view the locations of control files, log files and data files through the following commands:
SQL> SELECT name FROM v$controlfile; SQL> SELECT member FROM v$logfile; SQL> SELECT name FROM v$datafile;
- View log files
You can use SQL statements or logs File management tool to view Oracle log files.
View online log files
Online log files include the current log file and all unarchived log files. You can use the following command to view online log files:
SQL> SELECT * FROM v$log;
This command will display all current online log files and their related information.
View archive log files
You can use the following command to view archive log files:
SQL> SELECT * FROM v$archived_log;
This command will display the name, path, start time and end time of the archive log file, etc. information.
View the contents of the log file
You can use the following commands to view the contents of the log file:
SQL> ALTER SYSTEM SWITCH LOGFILE; SQL> ALTER SYSTEM ARCHIVE LOG ALL; SQL> SELECT * FROM v$log_history;
The first command is used to switch log files, and the second command is used for archiving Log files, the third command is used to view the history of archived log files.
- View log files through Oracle Enterprise Manager
Oracle Enterprise Manager is a set of integrated tools for managing Oracle databases, which can easily view database log information. In the log management page, you can view log files, archived logs, and all error and warning messages. You can use the following steps to view database log information in Oracle Enterprise Manager:
- Enter the main page of Oracle Enterprise Manager
- Select the database instance and click the "Log" tab
- In the log management page, you can view log files, archive logs, and error and warning messages
- Use LogMiner to view logs
LogMiner is a set of data provided by Oracle based on log files Mining tool to view database log information. You can use the following command to use LogMiner to view database log information:
- Enter SQL*Plus
- Open LogMiner:
SQL> EXECUTE DBMS_LOGMNR.START_LOGMNR(options =>DBMS_LOGMNR.DICT_FROM_ONLINE_CATALOG);
- Analyze the log file And output the result:
SQL> SELECT timestamp, sql_redo FROM v$logmnr_contents;
Through the above methods, you can check the log information of the database and the running status of the database program, which is important for locating and solving database problems.
The above is the detailed content of How to view oracle logs. For more information, please follow other related articles on the PHP Chinese website!

The differences in user experience between MySQL and Oracle are mainly reflected in: 1. MySQL is simple and easy to use, suitable for quick access and high flexibility scenarios; 2. Oracle has powerful functions, suitable for scenarios that require enterprise-level support. MySQL's open source and free features attract startups and individual developers, while Oracle's complex features and tools meet the needs of large enterprises.

The difference between MySQL and Oracle in performance and scalability is: 1. MySQL performs better on small to medium-sized data sets, suitable for fast scaling and efficient reading and writing; 2. Oracle has more advantages in handling large data sets and complex queries, suitable for high availability and complex business logic. MySQL extends through master-slave replication and sharding technologies, while Oracle achieves high availability and scalability through RAC.

Key features of Oracle software include multi-tenant architecture, advanced analytics and data mining, real-time application clustering (RAC), and automated management and monitoring. 1) A multi-tenant architecture allows for the management of multiple independent databases in one database instance, simplifying management and reducing costs. 2) Advanced analytics and data mining tools such as Oracle Advanced Analytics and OracleDataMining help extract insights from data. 3) Real-time application cluster (RAC) provides high availability and scalability, improving system fault tolerance and performance. 4) Automated management and monitoring tools such as Oracle EnterpriseManager (OEM) to automate daily maintenance tasks and monitor numbers in real time

Oracle has a profound impact in the fields of data management and enterprise applications. Its database is known for its reliability, scalability and security, and is widely used in industries such as finance, medical care and government. Oracle's influence has also expanded to middleware and cloud computing fields such as WebLogicServer and OracleCloudInfrastructure (OCI), providing innovative solutions. Despite the competition in the open source database and cloud computing market, Oracle maintains its leading position through continuous innovation.

Oracle's mission is to "help people see the value of data", and its core values include: 1) Customer first, 2) Integrity, 3) Innovation, and 4) Teamwork. These values guide Oracle's strategic decision-making and business innovation in the market.

Oracle Database is a relational database management system that supports SQL and object relational models to provide data security and high availability. 1. The core functions of Oracle database include data storage, retrieval, security and backup and recovery. 2. Its working principle involves multi-layer storage structure, MVCC mechanism and optimizer. 3. Basic usages include creating tables, inserting and querying data; advanced usages involve stored procedures and triggers. 4. Performance optimization strategies include the use of indexes, optimized SQL statements and memory management.

In addition to database management, Oracle software is also used in JavaEE applications, data grids and high-performance computing. 1. OracleWebLogicServer is used to deploy and manage JavaEE applications. 2. OracleCoherence provides high-performance data storage and caching services. 3. OracleExadata is used for high performance computing. These tools allow Oracle to play a more diversified role in the enterprise IT architecture.

Oracle is not only a database company, but also a leader in cloud computing and ERP systems. 1. Oracle provides comprehensive solutions from database to cloud services and ERP systems. 2. OracleCloud challenges AWS and Azure, providing IaaS, PaaS and SaaS services. 3. Oracle's ERP systems such as E-BusinessSuite and FusionApplications help enterprises optimize operations.


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

SublimeText3 Chinese version
Chinese version, very easy to use

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function

Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

WebStorm Mac version
Useful JavaScript development tools

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