Dhiraj Kumar's Blog

Category: oracle

  • ACFS Replication Based On Tagging

    ACFS tagging plays a crucial role in optimizing ACFS replication. Instead of duplicating an entire mount point tagging allows administrators to selectively replicate only specific files or directories. During the initial replication setup on the primary system, tags can be assigned to define the scope of data to be replicated. These tags can also be…

  • Oracle GoldenGate Microservices Failing to Start via XAG

    A few days back, I set up Oracle GoldenGate Microservices on: This database is vital for real-time data synchronization, and Oracle GoldenGate is the preferred solution for such requirements. It’s a very popular product nowadays for data replication and synchronization across environments. Personally, I appreciate and highly value Oracle GoldenGate for its robustness and capabilities…

  • OPATCHAUTO-72043 -Failed to apply the Patch

    Some time ago, I attempted to apply a patch to upgrade my 2-node Oracle RAC Grid Infrastructure from version 19.24 to 19.27. However, I encountered the following error: SEVERE [1] com.oracle.glcm.patch.auto.OPatchAuto – OPatchAuto failed.> com.oracle.glcm.patch.auto.OPatchAutoException: OPATCHAUTO-72043: Patch collection failed.> OPATCHAUTO-72043: Failed to create bundle patch object.> OPATCHAUTO-72043: Please verify the patch supplied.> at com.oracle.glcm.patch.auto.db.integration.model.plan.PatchingProcessInitializer.initializePatchPackageBag(PatchingProcessInitializer.java:97)> at…

  • How ToResolved a Duplicate Diskgroup Issue in Oracle RAC 19c (19.27)

    Recently, I encountered a situation in a 2-node Windows RAC 19c environment running the latest 19.27 Grid Infrastructure version.I had added a disk back using the force option. However, I mistakenly did not specify the disk name, which resulted in the creation of a duplicate disk associated with a new disk group (Group Number 0).…

  • ASM Disk Migration Error: Sector Size Mismatch Between RHEL 7 and RHEL 8 ([512] vs [4096])

    Environment Details: We are migrating a standalone Oracle Restart-based database server from RHEL 7 to RHEL 8. The existing ASM disks were created using ASMLib 2 on RHEL 7. Post-migration steps included: Mounting the NetApp LUNs (created in RHEL 7) onto the new RHEL 8 (or RHEL 9) server. Running the following commands: All above…

  • Introduce GRUB As The Most Commonly used Bootloader In Linux.

    GRUB is a bootloader used in most Linux distributions. A bootloader is a small program responsible for loading the operating system into memory and starting it. GRUB supports multiple operating systems, making it an excellent tool for dual-boot setups. There are two main versions of GRUB: GRUB 2 offers better support for modern filesystems, modularity,…

  • Storage AFD:UNMAP Protocol With ASM Disk

    In Oracle storage environments using ASM (Automatic Storage Management) with AFD (ASM Filter Driver), the UNMAP protocol plays a key role in space reclamation—especially when you’re using thin-provisioned storage such as SSDs or SAN systems that support SCSI UNMAP or NVMe deallocation. What is the UNMAP Protocol? The UNMAP protocol is a SCSI command (or…