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