Osman’s DBlog

RMAN Register database for Catalog fails with ORA-01403

27 Jul 2026 00:42

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Osman DİNÇ

Backup, Databases, Oracle

The RMAN database registration process encountered an error, specifically ORA-01403 (no data found), during its initial synchronization due to an existing restore point. Despite entering commands correctly, the registration failed because RMAN could not process the restore point metadata across the CDB. Upon identifying this issue through trace analysis, the restore point was deleted, allowing successful completion of the database registration process, highlighting the importance of internal procedures in troubleshooting.
ORA-48128: opening of a symbolic link is disallowed during Data Pump Export

26 Jul 2026 14:48

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Osman DİNÇ

Backup, Databases, Oracle

This post explains how a Data Pump export in an Oracle RAC environment failed with misleading errors, including ORA-48128, related to symbolic links and file access. The actual cause was an NFS-mounted Data Pump directory that was accessible from only one RAC node. Adding CLUSTER=N resolved the issue by keeping all Data Pump workers on the local instance. Alternatively, mounting the NFS filesystem on all RAC nodes also resolves the problem.
Escalating Update Decisions to Oracle Update Advisor

21 May 2026 22:55

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Osman DİNÇ

Databases, Update

The content discusses the role of Oracle Update Advisor in assisting DBAs with patch management decisions. While automation tools efficiently execute patches, they lack the capability to evaluate whether updates align with an organization’s needs. Oracle Update Advisor addresses this gap by providing status indicators and allowing customization of maintenance policies to better reflect operational realities.
How to Configure RHP Server for Oracle FPP Local Mode in 19c Oracle RAC

20 May 2026 22:12

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Osman DİNÇ

Databases, Oracle, Update

The Oracle Fleet Patching and Provisioning (FPP) local mode, in 19c environments, mandates a Grid Infrastructure Management Repository (GIMR) for local automation. Users must configure GIMR when components are missing or when it was not initially installed. The MDBUtil tool assists with setting up GIMR, ensuring the environment is adequate for running FPP local mode. Additionally, commands for managing Cluster Health Monitor resources are outlined in this post.
Fixing “Wallet Key Needed” Errors During Oracle PDB Migration Despite No Encrypted Tablespaces

18 May 2026 22:13

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Osman DİNÇ

Databases, Oracle, Update

This post details a specific challenge encountered during a non-CDB to PDB migration when the database remained in RESTRICTED mode due to encryption-related errors. The issue arose from a missing TDE key, despite the absence of encrypted tablespaces. The process of locating the required master key is described with merging it into the CDB wallet, and ultimately exporting and importing the key to resolve the violation.
Oracle Database Appliance Disk State FAILED / DiskRemoved but ASM Healthy: Troubleshooting Guide

17 May 2026 01:03

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by

Osman DİNÇ

Databases, Exadata, Oracle

While working with an Oracle Database Appliance, an inconsistency arose between the management layer and the storage stack, leading to a disk reported as “FAILED” by odaadmcli. Further investigation revealed the disk was fully operational, with ASM actively using it. Troubleshooting involved validating multipath status, ASM state, and using the odaadmcli stordiag command. A file synchronization issue was discovered, which was resolved by restarting the OAK daemon, returning the disk to an “ONLINE” state.