A session in Oracle is a temporary connection to the database server for users to perform queries and operations. Each session has a unique SID. A session consists of connection information, environment information, transaction status, lock information and performance statistics. It is allocated from the session pool when a session is created and reused when the session is closed. To view session information, you can query the v$session and V$SESSION_LONGOPS views.
Session in Oracle
In the Oracle database, a session is a session established with the database server. Temporary connection. It is the medium through which users interact with the database, allowing users to perform queries, update data, and perform other operations. Each session has a unique session identifier (SID) that distinguishes it from other sessions.
Components of the session:
- Connection information: Connection parameters used when establishing the session, such as username, password and connection string.
- Environment information: The current settings for the session, such as time zone, locale, and session variables.
- Transaction status: Whether the session is currently in a transaction, and the status of the transaction (committed, rolled back).
- Lock information: Any locks held by the session and the lock type and status.
- Performance statistics: Performance information associated with the session, such as query execution time and memory usage.
Session life cycle:
- Creation: When a user connects to the database, a session is created.
- Usage: Sessions are used to perform queries and operations.
- Close: The session is closed when the user disconnects or the session idle times out.
Session Management:
Oracle Database Management System (DBMS) maintains a session pool that contains a list of available sessions. When a user connects to the database, the DBMS allocates a session from the session pool. To optimize performance, the DBMS also automatically closes idle sessions and reuses them.
View session information:
You can view information about the session, such as SID, username, and connection time, by querying the v$session view. You can also use the V$SESSION_LONGOPS view to view long-running operations.
The above is the detailed content of What does session mean in oracle?. For more information, please follow other related articles on the PHP Chinese website!
Oracle's Software Suite: Products and Services ExplainedMay 09, 2025 am 12:12 AMOracle's software suite includes database management, ERP, CRM, etc., helps enterprises optimize operations, improve efficiency, and reduce costs. 1. OracleDatabase manages data, 2. OracleERPCloud handles finance, human resources and supply chain, 3. Use OracleSCMCloud to optimize supply chain management, 4. Ensure data flow and consistency through APIs and integration tools.
MySQL vs. Oracle: Licensing, Features, and BenefitsMay 08, 2025 am 12:05 AMThe main difference between MySQL and Oracle is licenses, features, and advantages. 1. License: MySQL provides a GPL license for free use, and Oracle adopts a proprietary license, which is expensive. 2. Function: MySQL has simple functions and is suitable for web applications and small and medium-sized enterprises. Oracle has powerful functions and is suitable for large-scale data and complex businesses. 3. Advantages: MySQL is open source free, suitable for startups, and Oracle is reliable in performance, suitable for large enterprises.
MySQL vs. Oracle: Selecting the Right Database SystemMay 07, 2025 am 12:09 AMMySQL and Oracle have significant differences in performance, cost and usage scenarios. 1) Performance: Oracle performs better in complex queries and high concurrency environments. 2) Cost: MySQL is open source, low cost, suitable for small and medium-sized projects; Oracle is commercialized, high cost, suitable for large enterprises. 3) Usage scenarios: MySQL is suitable for web applications and small and medium-sized enterprises, and Oracle is suitable for complex enterprise-level applications. When choosing, you need to weigh the specific needs.
Oracle Software: Maximizing Efficiency and PerformanceMay 06, 2025 am 12:07 AMOracle software can improve performance in a variety of ways. 1) Optimize SQL queries and reduce data transmission; 2) Appropriately manage indexes to balance query speed and maintenance costs; 3) Reasonably configure memory, optimize SGA and PGA; 4) Reduce I/O operations and use appropriate storage devices.
Oracle: Enterprise Software and Cloud ComputingMay 05, 2025 am 12:01 AMOracle is so important in the enterprise software and cloud computing sectors because of its comprehensive solutions and strong technical support. 1) Oracle provides a wide range of product lines from database management to ERP, 2) its cloud computing services such as OracleCloudPlatform and Infrastructure help enterprises achieve digital transformation, 3) Oracle database stability and performance and seamless integration of cloud services improve enterprise efficiency.
MySQL vs. Oracle: A Comparative Analysis of Database SystemsMay 04, 2025 am 12:13 AMMySQL and Oracle have their own advantages and disadvantages, and comprehensive considerations should be taken into account when choosing: 1. MySQL is suitable for lightweight and easy-to-use needs, suitable for web applications and small and medium-sized enterprises; 2. Oracle is suitable for powerful functions and high reliability needs, suitable for large enterprises and complex business systems.
MySQL vs. Oracle: Understanding Licensing and CostMay 03, 2025 am 12:19 AMMySQL uses GPL and commercial licenses for small and open source projects; Oracle uses commercial licenses for enterprises that require high performance. MySQL's GPL license is free, and commercial licenses require payment; Oracle license fees are calculated based on processors or users, and the cost is relatively high.
Oracle: From Databases to Cloud ServicesMay 02, 2025 am 12:05 AMOracle's evolution from database to cloud services demonstrates its strong technical strength and market insight. 1. Oracle originated in the 1970s and is famous for its relational database management system, and has launched innovative functions such as PL/SQL. 2. The core of Oracle database is relational model and SQL optimization, which supports multi-tenant architecture. 3. Oracle cloud services provide IaaS, PaaS and SaaS through OCI, and AutonomousDatabase performs well. 4. When using Oracle, you need to pay attention to the complex licensing model, performance optimization and data security issues in cloud migration.
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
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.
ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment
SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.
PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool
MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.
