oracle rac concepts

as the logical volume manager of the cluster, you can easily monitor a single-instance Oracle database without interruption. When a node fails, the database is automatically migrated to the slave node. Based on the size of the initialization parameters fast_start_mttr_target and recovery set, this failover may be very fast. However, as part of the Failover process, the user's database connection will be disconnected. Active/passive mode can be enable

applied as a special Oracle instance, with its own SGA, but without a continuous dictionary. In RAC, each cluster node has and has only one individual ASM instance. When started, each instance detects ASM disk group resources in the grid infrastructure through initialization parameters in the cluster software. Each instance will mount these disk groups. By giving the correct permissions (ASM11.2 introduced

1. Concurrency Control In a cluster environment, key data is usually shared and stored, for example, on a shared disk. Each node has the same access permission to the data. In this case, there must be a mechanism to control the node's access to the data. Oracle RAC uses the DLM (distribute Lock Management) mechanism to control concurrency among multiple instances. 2. Amnesia (amnesia) The Cluster Envi

L CRSD. Log: $ORA _crs_home/log/hostname/crsd/crsd. Log L OCSSD. Log: $ORA _CRS_HOME/LOG/HOSTNAME/CSSD/OCSD. Log L EVMD. Log: $ORA _CRS_HOME/LOG/HOSTNAME/EVMD/EVMD. Log Nodeapp Log Location$ORA _crs_home/log/hostname/racg/This is a log of Nodeapp, including ONS and VIPs, such as ORA. Rac1.ons.Log Tool Execution log: $ORA _crs_home/log/hostname/client/Clusterware provides a number of command-line tools such as Ocrcheck, Ocrconfig,ocrdump,oifcfg, and Clscfg, and the logs gen

textbook Oracle one-off RAC Survival Guide Oracle 11gR2 RAC Management and performance optimization Oracle Database 11g Release 2 RAC on Linux Using NFS Best Practices for installing

[Switch] RAC concepts and principles Some special problems in a cluster environment 1.1 Concurrency Control In a cluster environment, key data is usually shared and stored, for example, on a shared disk. Each node has the same access permission to the data. In this case, there must be a mechanism to control the node's access to the data. Oracle

text. Before reading the Oracle RAC installation and use tutorial, I will first comb the whole idea and formation of this article. Due to the different levels of knowledge storage for readers, I will start with the preparation and planning of Oracle RAC before installing the deployment of

documents Oracle's three highly available cluster scenarios Introduction to cluster Concept: The Oracle Advanced Course--theoretical textbook Oracle one-off RAC Survival Guide Oracle 11gR2 RAC Management and performance optimization Article

"Udp_|tcp_|sb_max"Modify No-p-O udp_sendspace=262144No-p-O udp_recvspace=1310720No-p-O tcp_sendspace=262144No-p-O tcp_recvspace=262144No-p-O sb_max=2621440Linux Viewing Files/etc/sysctl.confModify Sysctl-w net.core.rmem_max=2621440Sysctl-w net.core.wmem_max=2621440Sysctl-w net.core.rmem_default=262144Sysctl-w net.core.wmem_default=262144HP-UX does not requireHP TRU64 View/sbin/sysconfig-q UDPModify: Edit File/etc/sysconfigtabInet:udp_recvspace = 65536Udp_sendspace = 65536Windows does not requir

Some special problems in a cluster environment 1.1 Concurrency Control In a cluster environment, key data is usually shared and stored, for example, on a shared disk. Each node has the same access permission to the data. In this case, there must be a mechanism to control the node's access to the data. Oracle RAC uses the DLM (Distribute Lock Management) mechanism to control concurrency among multiple instan

In a cluster environment, key data is usually shared and stored, for example, on a shared disk. Each node has the same access permission to the data, so there must be a mechanism In a cluster environment, key data is usually shared and stored, for example, on a shared disk. Each node has the same access permission to the data, so there must be a mechanism Some special problems in a cluster environment 1.1 Concurrency Control In a cluster environment, key data is usually shared and stored,

file (blog Park) Article Navigation Introduction to cluster concept (i) Oracle Cluster Concepts and principles (ii) How RAC Works and related components (iii) Cache Fusion Technology (IV) RAC special problems and combat experience (V) ORACL