A deep dive into the architecture and features of Oracle RAC

Oracle RAC (Real Application Clusters) is a scalability solution provided by Oracle that allows Oracle database instances to be run on multiple servers and multiple servers combined together to provide high availability and scalability. The architecture and features of Oracle RAC are very unique. This article will delve into the architecture, features and specific code examples of Oracle RAC.

1. Oracle RAC architecture

Oracle RAC architecture uses shared storage and shared network, and multiple instances access the database at the same time. It has the following core components:

1. Oracle Clusterware

Oracle Clusterware is the foundation of Oracle RAC and is used to manage communication between cluster nodes and Resource Scheduling. It ensures high availability and failover between various nodes in the cluster.

2. Oracle ASM (Automatic Storage Management)

Oracle ASM is a tool for managing cluster storage, which can automatically allocate and manage storage resources. Improve performance and scalability.

3. Cache Fusion

Cache Fusion is a key feature of Oracle RAC. It exchanges data blocks between nodes through shared memory to Reduce data redundancy and improve performance.

4. Global Cache Service (GCS)

GCS is used to manage the access and cache transmission of shared data blocks to ensure the consistency of data on different nodes performance and availability.

2. Characteristics of Oracle RAC

1. High availability

##Oracle RAC provides failover and automatic recovery functions, even if If one of the nodes fails, the database can still continue to run, ensuring high availability of the system.

2. Linear scalability

Oracle RAC supports dynamic addition and removal of nodes, and can adjust the cluster size according to needs to achieve linear scalability , improving the system capacity and performance.

3. Load Balancing

Oracle RAC uses load sharing between nodes and Cache Fusion technology to evenly distribute workloads on multiple nodes, improving the overall performance of the system.

3. Code Example

The following is a simple Oracle RAC code example that demonstrates how to create and manage database tables in an Oracle RAC environment:

-- 创建表空间
CREATE TABLESPACE rac_data 
DATAFILE 'rac_data.dbf' SIZE 100M
EXTENT MANAGEMENT LOCAL UNIFORM SIZE 1M;

-- 创建用户
CREATE USER rac_user IDENTIFIED BY password
DEFAULT TABLESPACE rac_data
TEMPORARY TABLESPACE temp;

-- 授权用户权限
GRANT CONNECT, RESOURCE TO rac_user;

-- 创建表
CREATE TABLE rac_table (
    id NUMBER PRIMARY KEY,
    name VARCHAR2(50)
);

-- 插入数据
INSERT INTO rac_table (id, name) VALUES (1, 'Alice');
INSERT INTO rac_table (id, name) VALUES (2, 'Bob');

-- 查询数据
SELECT * FROM rac_table;

The above code example Demonstrates the creation of table spaces, users and tables in the Oracle RAC environment, and the operations of data insertion and query. Through the architecture and features of Oracle RAC, users can achieve high availability, scalability and load balancing in the cluster, improving the overall performance and stability of the database system.

In general, Oracle RAC, as a powerful cluster solution, plays an important role in enterprise-level database systems. Through an in-depth understanding of the architecture and characteristics of Oracle RAC, as well as specific code examples, you can better understand and apply Oracle RAC technology and improve the efficiency and reliability of the database system.

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