Usage of RAC in Oracle: 1. Provide high availability by running database instances on multiple servers; 2. Allow the number of nodes to be increased or reduced when needed; 3. By distributing the workload to multiple nodes to achieve load balancing; 4. Use shared storage to achieve data sharing between multiple nodes; 5. Allow multiple nodes to process database requests at the same time, thereby achieving parallel processing; 6. Provide a transparent failover function; 7. Use Provides some technologies to ensure data consistency; 8. Provides management tools to simplify the management and maintenance of RAC environment.
Oracle Real Application Clusters (RAC) is a feature of Oracle Database that allows a database instance to be run on multiple servers, which can share the same Physical storage. RAC provides high availability, scalability and load balancing solutions so that the database can better meet the needs of enterprises. In this article, we will introduce the usage of Oracle RAC and some of the key features it provides.
1. High availability: Oracle RAC provides high availability by running database instances on multiple servers. When one node fails, other nodes can take over its work, thus ensuring database continuity. RAC uses Oracle Clusterware to implement communication and coordination between nodes to ensure high availability of the database.
2. Scalability: Oracle RAC allows the number of nodes to be increased or reduced when needed, thereby achieving database scalability. By adding more nodes, the system's processing power and storage capacity can be increased to meet growing business needs. RAC also supports dynamic online node addition and deletion, and node expansion and reduction can be completed without downtime.
3. Load balancing: Oracle RAC achieves load balancing by distributing workloads to multiple nodes. RAC uses Oracle Clusterware to monitor the load of nodes and automatically allocate workloads to the most suitable nodes based on the load. This can improve the performance and throughput of the system and avoid the performance bottleneck of a single node.
4. Shared storage: Oracle RAC uses shared storage to achieve data sharing between multiple nodes. Shared storage can be SAN (Storage Area Network) or NAS (Network Attached Storage). Multiple nodes can access data files and log files in shared storage at the same time, thereby achieving data consistency and reliability.
5. Parallel processing: Oracle RAC allows multiple nodes to process database requests at the same time, thereby achieving parallel processing. This can improve the system's processing power and response speed, especially when handling a large number of concurrent requests. RAC uses Oracle Parallel Server (OPS) technology to implement parallel processing between nodes.
6. Transparent failover: Oracle RAC provides a transparent failover (Transparent Failover) function. When a node fails, RAC can automatically switch the workload to other nodes without requiring manual intervention by the user. . This minimizes system downtime and risk of data loss.
7. Data consistency: Oracle RAC uses some technologies to ensure data consistency. For example, it uses Cache Fusion technology to share data blocks between nodes to ensure data consistency. In addition, RAC also provides some mechanisms to handle concurrent access and update conflicts to avoid data inconsistency.
8. Management tools: Oracle RAC provides some management tools to simplify the management and maintenance of the RAC environment. For example, Oracle Enterprise Manager (OEM) provides a graphical interface that can be used to monitor and manage RAC environments. In addition, there are command line tools and scripts that can be used to perform common management tasks such as node addition, removal, and failover.
Summary
Oracle RAC is a powerful database feature that provides high availability, scalability and load balancing solutions. By running database instances on multiple servers and using shared storage to share data, RAC can improve the performance, availability, and scalability of the system. In addition, RAC also provides some management tools to simplify the management and maintenance of RAC environment. Oracle RAC is a valuable choice for enterprises requiring high availability and performance.
The above is the detailed content of Introduction to the usage of RAC in Oracle. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undress AI Tool
Undress images for free
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
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)
How to uninstall MySQL and clean residual files
Apr 29, 2025 pm 04:03 PM
To safely and thoroughly uninstall MySQL and clean all residual files, follow the following steps: 1. Stop MySQL service; 2. Uninstall MySQL packages; 3. Clean configuration files and data directories; 4. Verify that the uninstallation is thorough.
Oracle's Role in the Business World
Apr 23, 2025 am 12:01 AM
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.
MongoDB vs. Oracle: Choosing the Right Database for Your Needs
Apr 22, 2025 am 12:10 AM
MongoDB is suitable for unstructured data and high scalability requirements, while Oracle is suitable for scenarios that require strict data consistency. 1.MongoDB flexibly stores data in different structures, suitable for social media and the Internet of Things. 2. Oracle structured data model ensures data integrity and is suitable for financial transactions. 3.MongoDB scales horizontally through shards, and Oracle scales vertically through RAC. 4.MongoDB has low maintenance costs, while Oracle has high maintenance costs but is fully supported.
What software is better for yi framework? Recommended software for yi framework
Apr 18, 2025 pm 11:03 PM
Abstract of the first paragraph of the article: When choosing software to develop Yi framework applications, multiple factors need to be considered. While native mobile application development tools such as XCode and Android Studio can provide strong control and flexibility, cross-platform frameworks such as React Native and Flutter are becoming increasingly popular with the benefits of being able to deploy to multiple platforms at once. For developers new to mobile development, low-code or no-code platforms such as AppSheet and Glide can quickly and easily build applications. Additionally, cloud service providers such as AWS Amplify and Firebase provide comprehensive tools
MySQL vs. Oracle: Licensing, Features, and Benefits
May 08, 2025 am 12:05 AM
The 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 and Oracle: Exploring Performance and Scalability
Apr 29, 2025 am 12:12 AM
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.
MySQL vs. Oracle: Understanding Licensing and Cost
May 03, 2025 am 12:19 AM
MySQL 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.
How to learn Java without taking detours. Share methods and techniques for efficiently learning Java
May 20, 2025 pm 08:24 PM
The key to learning Java without taking detours is: 1. Understand core concepts and grammar; 2. Practice more; 3. Understand memory management and garbage collection; 4. Join online communities; 5. Read other people’s code; 6. Understand common libraries and frameworks; 7. Learn to deal with common mistakes; 8. Make a learning plan and proceed step by step. These methods can help you master Java programming efficiently.
