oracle rac architecture

Cache fusion Technology and main background process (iv) Overview: write down the original intent and motivation of this document, derived from the Oracle Basic operating Manual of the previous article. The Oracle Basic Operations Manual is a summary of the author's vacation on Oracle's foundational knowledge learning. Then form a summary of the system, a review review, the other is easy to use. Th

17:17:47 Cluster installationBefore you perform an Oracle cluster installation, first look at the overall cluster architecture diagram. Another: Oracle RAC cluster Overall configuration is based on three steps (pre-configuration, cluster installation, database installation)

resources. Under normal conditions, CRSD monitors various node resources. When a resource is abnormal, automatically Restart or switch the resource.3. Process Monitor Daemon (OPROCD for short). The Process is locked in the memory. The user monitors the cluster and provides I/O protection (I/O fencing ). OPROCD runs on each node and regularly performs health checks. If the interval is exceeded, it still cannot communicate with a node process, then OPROCD will reset the processor and restart the

flashback database feature introduced in Oracle 10 Gb greatly reduces the recovery time in many cases. In fact, the flashback database feature has become very useful, not only for online production database recovery, but also for DataIn the guard environment. Introduction to Oracle standby Database To avoid site faults or human errors, you need to add an additional precaution in the

Sync Service (Cluster Synchronization Service)managing membership of a cluster node controls which node is the member of the cluster, the node notifies the cluster member when joining or leaving the cluster to control the cluster configuration information, which causes the cluster to restart, provides a heartbeat mechanism to monitor the cluster status (DISK HEARTBEAT and NETWORK Hearbeat), the process is run by Oracle User management EVMD Incident M

the database. The High availability cluster (HI availability CLUSTER,HAC) focuses on ensuring that database applications continue. Most of the database clusters focus on this. L High Security CLUSTER,HSC focuses on disaster recovery. Only Oracle RAC can achieve the above three aspectsScalable, distributed database architecture(i)

instance, but access to the remote instance also needs to be managed. For this reason, Oracle uses the global Resource Directory (GRD) and some additional background processes. (Oracle combines the v$ view with the instance identity to form a gv$ view, a gv$ view that contains the dynamic performance view of all instances in the cluster) Global resource Directory (GRD)

instance, but access to the remote instance also needs to be managed. For this reason, Oracle uses the global Resource Directory (GRD) and some additional background processes. (Oracle combines the v$ view with the instance identity to form a gv$ view, a gv$ view that contains the dynamic performance view of all instances in the cluster) Global resource Directory (GRD)

3.6. Cluster Management Command 3.6.1. Startup and shutdown of RAC Oracle RAC is powered on by default and can be used with the following commands if maintenance is required: Shut down:crsctl Stop cluster Stopping this node Cluster servicecrsctl Stop Cluster–all all node servicesOpen:crsctl start cluster turn on this node Cluster servi

message will be prompted. [Grid @ rac-one install] $./rootcrs. plYou must be logged in as root to run this script.Log in as root and rerun this script.2014-04-01 17: 08: 12: Not running as authorized userInsufficient privileges to execute this script.Root or administrative privileges needed to run the script. For more information about the script function, see-help. Such as upgrade, rollback, and reconfiguration wait [Root @

Label:Data Guard is a remote replication technology for Oracle, it has physical and logical points, but in general, it needs a separate system in a remote location, two sets of hardware configurations can be different systems, but the software structure of the two systems are consistent, including the software version, directory storage structure, and data synchronization (in fact, is not real-time synchronization), the two sets of systems as long as

Recently, the Oracle 10g RAC migration under the virtual machine, after the migration is completed, the Oracle cluster resource VIP cannot start normally, received the CRS-0233: resource or relatives are currently involved with another operation error prompt. Why? It turns out that the migrated address has changed. You have to use the new address in your house ..

The most outstanding performance of Oracle RAC clusters is high availability, which mainly includes load balance and failover. These technologies enable single point of failure (spof) to prevent normal access to the database by client applications, and load balancing between nodes by creating a service. This article describes the Oracle failover test in the

Different cluster products have their own characteristics, RAC features include the following points: • Dual-machine parallel. RAC is a parallel mode, not a traditional master and standby mode. That is, all members of the RAC cluster can receive client requests at the same time. • High availability. RAC is a high-avail

communication communication RAC Architecture and Concepts 1. RAC Software principle in a RAC instance, you will see some background processes that do not exist in ordinary instance, which are primarily used to maintain database consistency in each instance. Manage global resources, as follows: * lmon: Global Qu