What is Cache Fusion in RAC? || GRD (Global Resource Directory) || GCS and GES Background Process
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Cache Fusion in RACWhat is
Cache Fusion in RAC
What is Cache Fusion in RAC? || GRD (Global Resource Directory) || GCS and GES Background Process
Oracle RAC transfers data blocks from the buffer cache of one instance to the buffer cache of another instance across the cluster interconnect
Advantages:
- No I/O activity
- Data blocks transfer via private N/W – cluster interconnect N/W
- Performance Improvement
In RAC Internodes-Synchronization is very important
Which will prevent the changing the same block by 2 different connections
Internode-Synchronization guarantee that each instance sees the most recent version of the block
1. Cluster required synchronization among the cluster nodes
2. RAC uses GRD – Global Resource Directory to record how the resource are used within the cluster
GCS – Global Cache Service
GES – Global Enqueues Service
3. GCC & GES manages the information in GRD
4. Each Instance manages part of GRD in its SGA
5. GCS and GES nominate the master node to manage the all the information in GRD
6. Each instance know who is master and which instance has what resource
7. Cache Coherency – Keeping the data blocks consistent across the cluster nodes
8. GCS implements this cache coherency by technic called Cache Fusion algorithm
GES:
- dictionary cache locks
- library cache locks
- dead locks
#CacheFusion #GRD #GCS #GES #Clusterware #ClusterMasterNode #Database #Exadata #RAC #ASM #Oracle
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What is Cache Fusion in RAC? || GRD (Global Resource Directory) || GCS and GES Background Process
Oracle RAC transfers data blocks from the buffer cache of one instance to the buffer cache of another instance across the cluster interconnect
Advantages:
- No I/O activity
- Data blocks transfer via private N/W – cluster interconnect N/W
- Performance Improvement
In RAC Internodes-Synchronization is very important
Which will prevent the changing the same block by 2 different connections
Internode-Synchronization guarantee that each instance sees the most recent version of the block
1. Cluster required synchronization among the cluster nodes
2. RAC uses GRD – Global Resource Directory to record how the resource are used within the cluster
GCS – Global Cache Service
GES – Global Enqueues Service
3. GCC & GES manages the information in GRD
4. Each Instance manages part of GRD in its SGA
5. GCS and GES nominate the master node to manage the all the information in GRD
6. Each instance know who is master and which instance has what resource
7. Cache Coherency – Keeping the data blocks consistent across the cluster nodes
8. GCS implements this cache coherency by technic called Cache Fusion algorithm
GES:
- dictionary cache locks
- library cache locks
- dead locks
#CacheFusion #GRD #GCS #GES #Clusterware #ClusterMasterNode #Database #Exadata #RAC #ASM #Oracle
Please do follow me and support me on,
LinkedIn: LinkedIn: mallik034
YouTube: mallik034
Fakebook: Facebook: mallik034
Blog: https://mallik034.blogspot.com
twitter: Twitter: mallik034
Instagram: Instagram: mallik034
FBPage: Facebook: mallik034oracledba
Skype: malluramadurg
Regards,
Mallikarjun Ramadurg
Mobile: +91 9880616848
WhatsApp: +91 9880616848
Email: [email protected]
LinkedIn: LinkedIn: mallik034
YouTube: mallik034
Fakebook: Facebook: mallik034
Blog: https://mallik034.blogspot.com
twitter: Twitter: mallik034
Instagram: Instagram: mallik034
FBPage: Facebook: mallik034oracledba
Skype: malluramadurg
4 سال پیش
در تاریخ 1399/08/15 منتشر شده
است.
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