[Yes, I know that 12.2 is now available for download but it will be some time before I have a running 12.2 RAC environment] Some OCR / OLR Commands : The OCR is the Cluster Registry.
With a successful RAC Cluster, running the Cluster Verification Utility [oracle@collabn1 ~]$ cluvfy stage -post crsinst -n collabn1,collabn2Performing post-checks for cluster services setupChecking node reachability...Node reachability check passed from node "collabn1"Checking user equivalence...User equivalence check passed for user "oracle"Checking node connectivity...Checking hosts config file...Verification of the hosts config file successfulCheck: Node connectivity using interfaces on subnet "192.168.78.0"Node connectivity passed for subnet "192.168.78.0" with node(s) collabn2,collabn1TCP connectivity check passed for subnet "192.168.78.0"Check: Node connectivity using interfaces on subnet "172.16.100.0"Node connectivity passed for subnet "172.16.100.0" with node(s) collabn1,collabn2TCP connectivity check passed for subnet "172.16.100.0"Checking subnet mask consistency...Subnet mask consistency check passed for subnet "192.168.78.0".Subnet mask consistency check passed for subnet "172.16.100.0".Subnet mask consistency check passed.Node connectivity check passedChecking multicast communication...Checking subnet "172.16.100.0" for multicast communication with multicast group "188.8.131.52"...Check of subnet "172.16.100.0" for multicast communication with multicast group "184.108.40.206" passed.Check of multicast communication passed.Checking whether the ASM filter driver is active and
For some weird reason, I can not get my OpenVPN server to come up at boot time using systemd on an Ubuntu Linux 16.04 LTS server.
Most default installation guides for Grid Infrastructure will have you creating a DATA Disk Group during the install.
Web performance is nothing but the speed in which web pages are downloaded and displayed on the user’s web browser.
Quick and Rough Notes : Undo and RedoUndo is where Oracle logs how to reverse a transaction (one or more DMLs in a transaction)Redo is where Oracle logs how to replay a transactionUndo and Redo are written to as the transaction proceeds, not merely at the end of the transaction(imagine a transaction that consists of 1million single-row inserts, each distinct insert is written to undo and redo) Undo segmentsOracle dynamically creates and drops Undo segments depending on transaction volumeAn undo segment consists of multiple extents.