By Steve Shaw, Julian Dyke
Step-by-step consultant for fitting 10g RAC on Linux. proceed to exploit it as a reference while fitting 11g RAC on Solaris 10 because the utilities are the entire similar.
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Extra resources for Pro Oracle Database 10g RAC on Linux: Installation, Administration, and Performance
While component failures are relatively rare, when there are a large number of servers, the overall mean time to failure may be quite low. The RAC option guarantees that on a correctly sized system, processing will continue in the event of a server failure. 1 and above it is possible to dynamically add nodes while the cluster is running. For a RAC cluster to be highly available, it must be possible for any node to fail without affecting the overall workload of the cluster. This means that in the event of a node failure there must be sufficient spare capacity among the remaining nodes to continue processing the workload.
Blocks that have been updated are referred to as dirty blocks until the version of the block in the buffer cache has been written to disk. In OPS, block coordination between instances was handled by a mechanism called Parallel Cache Management (PCM). If instance A required the current version block that was being held by instance B, then instance B would have to write the dirty block back to storage and then signal instance A to read the current version of the block from storage. This operation is known as a disk ping.
1 and above, the concept of database services, which were introduced in Oracle 8i, has been enhanced. A database service is a logical grouping of user sessions. Each database service can be assigned to a set of preferred instances that will be used if possible, and a set of backup instances that are used if the preferred instances are not available. 1, is a replacement for the DBMS_JOB package, which was originally released in Oracle7 and was never completely satisfactory. The Database Scheduler is much more flexible, allowing jobs to be grouped together in classes, job chains, and windows to be created, and external jobs such as shell scripts to be executed.
Pro Oracle Database 10g RAC on Linux: Installation, Administration, and Performance by Steve Shaw, Julian Dyke