Anish Kumar, Author at ASRblogger

OCI (Oracle Cloud Infrastructure) Oracle

OCI Compute Instance , Boot Volume , Block Volume

OCI Compute Instance Creation Step 1 — Navigate to Compute Instances OCI Console → Compute → Instances What this section is used for Creating Virtual Machines (VMs) Managing instance lifecycle…

Anish Kumar March 20, 20263

OCI (Oracle Cloud Infrastructure) Oracle

OCI Networking – Route Tables & Public Subnet

Internet ↓ Internet Gateway ↓ Public Route Table (0.0.0.0/0 → IGW) ↓ Public Subnet (10.0.64.0/24) ↓ Public Instances / LB Step 1 — Create a Custom Route Table (Public Route Table) Navigate to: VCN → Routing → Create…

Anish Kumar March 20, 2026No Comments

OCI (Oracle Cloud Infrastructure) Oracle

OCI Virtual Cloud Network (VCN) Networking

Introduction What is a Virtual Cloud Network (VCN)? A Virtual Cloud Network (VCN) in Oracle Cloud Infrastructure is a private, software-defined network where you deploy cloud resources such as: Compute…

Anish Kumar March 20, 2026No Comments

OCI (Oracle Cloud Infrastructure) Oracle

OCI Compartments Theory and Practical Guide

Compartment Creation in OCI Identity & Security --> Compartments --> Create Compartment Introduction In Oracle Cloud Infrastructure (OCI), Compartments are a fundamental logical construct used to organize, isolate, and control…

Anish Kumar March 20, 2026No Comments

Databases Oracle

Oracle AI Database 26ai Free RPM Installation On Oracle Linux 9 (OL9)

Introduction An RPM-based installation performs preinstallation checks, extracts the database software, reassigns ownership of the extracted software to the preconfigured user and groups, maintains the Oracle inventory, and runs all…

Anish Kumar March 15, 2026No Comments

Databases Oracle

Bigfile Tablespaces in Oracle Database 26ai

Introduction Bigfile tablespaces were first introduced in Oracle Database 10g to simplify tablespace management and support very large databases. In recent releases such as Oracle Database 26ai, Oracle has moved…

Anish Kumar March 10, 2026No Comments

Oracle RAC

Oracle RAC Startup Architecture

When troubleshooting an Oracle Real Application Clusters environment, understanding the startup sequence of cluster components is extremely important. Many issues during node boot, cluster startup or database availability can be…

Anish Kumar March 1, 2026No Comments

OCI (Oracle Cloud Infrastructure) Oracle

OCI Network Visualizer & Network Path Analyzer

Introduction: In complex cloud environments, understanding how network components interact is critical for ensuring connectivity, security, and performance. Within Oracle Cloud Infrastructure (OCI), resources like Virtual Cloud Networks (VCNs), subnets,…

Anish Kumar February 28, 2026No Comments

ASM DataGuard Oracle

Reinstate or Recreate Standby DB after Failover

Reinstate Previous Primary DB as standby after Failover completed Fast_start failover initiated by Oracle: Oracle will try to reinstate old primary db as new standby. In case of failure (corrupted…

Anish Kumar January 29, 2026No Comments

DataGuard

Fast Start Failover Issues

Enable/disable: Prerequ.: Flashback needs to be enabled on primary and failover target: SQL> select NAME, OPEN_MODE, FLASHBACK_ON from v$database; NAME OPEN_MODE FLASHBACK_ON --------- -------------------- ------------------ ITSDBTST READ ONLY WITH APPLY…