Real app2 - Real app Oracle clusterware and database book 2...

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Real app. Oracle clusterware and database book 2 Su or root is not the same thing as su – or su –root The dash indicates the root user will function using the root user environment, will not include the oracle environment variables. Ps –ef | grep TST V$session and gv$session RAC HISTORY: Introduced with oracle 8i as oracle parallel server Multiple instances running on separate servers (nodes) No instance is the parent or is privileged Single database on shared storage equally accessible from all nodes Instances exchange information over a private interconnect network Centralized management control, high speed switch connects to clustered database instances. NO SINGLE POINT OF FAILURE Infrastructure: application servers go to data servers which comes from storage arrays What is a RAC database : MANDATORY - server parameter file (spfile) - SYSTEM, SYSAUX, and TEMP tablespaces - Undo tablespace (one per instance) - Datafiles - Control files - Online redo logs(one thread per instance) Optional: Archived redo logs Backups Flashback logs Change tracking writer files WHY RAC? High availability Transparent application failover Load balancing Lower initial cost/high return on investment Lower maintenance costs Server consolidation
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