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ORACLE CLOUD INFRASTRUCTURE

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OCI : ======= Oracle Cloud Infrastructure (OCI) is Oracle's cloud computing platform that provides a wide range of cloud services, including computing, storage, networking, databases, and security. It is designed for running enterprise workloads with high performance, security, and reliability. OCI Service Models OCI offers services across three major cloud models: 1)Infrastructure as a Service (IaaS) ------------------------------------- Provides fundamental cloud resources like compute, storage, and networking. Examples: Compute (Bare Metal, Virtual Machines, GPUs) Block, File & Object Storage Networking (Load Balancers, VPN, FastConnect) Oracle Cloud VMware Solution Dedicated Bare Metal Servers 2)Platform as a Service (PaaS) : ------------------------------- Provides managed services for databases, application development, and AI/ML without managing underlying infrastructure. Examples: Oracle Autonomous Database (Self-driving, self-securing, and self-repairing DB) Oracle Dat...
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RAC NOTES

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================================== Oracle Clusterware Startup Process : =================================== 1.File Read Order: - OLR (Oracle Local Registry) - VD (Voting Disk) - OCR (Oracle Cluster Registry) 2.Process Start Order: - OHASD (Oracle High Availability Services Daemon) - Main Wrapper script (etc/inittab) , OLR  - CSSD (Cluster Synchronization Services Daemon) - Main  Voting disk - GPNP profile - KFED/KFOD - CRSD (Cluster Ready Services Daemon)  - Main look for OCR and GPNP profile  Since Oracle 11g Release 2, the ASM spfile (Automatic Storage Management Server Parameter File) is automatically stored in the first disk group created during Grid Infrastructure installation. However, because the Voting Disk and OCR are stored in ASM, ASM must be started for Clusterware to function. This creates a challenge: how do you start ASM if its spfile is also stored on an ASM disk group? Clusterware Startup Sequence and Resolution: =====================================...
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