How do I check Data Guard apply lag?

Query V$DATAGUARD_STATS and review the Apply Lag value.

How do I check Data Guard transport lag?

Query V$DATAGUARD_STATS and review the Transport Lag value.

How do I detect archive gaps?

Use SELECT * FROM V$ARCHIVE_GAP.

What is RMAN Backup Validation?

RMAN Backup Validation verifies Oracle backup integrity and recoverability without performing a restore.

What does RESTORE DATABASE VALIDATE do?

It verifies that RMAN backups can be restored successfully without actually restoring files.

How do I detect Oracle block corruption?

Use V$DATABASE_BLOCK_CORRUPTION and RMAN VALIDATE DATABASE CHECK LOGICAL.

What are the most important Oracle DBA interview topics?

Oracle Architecture, RMAN, Backup and Recovery, Data Guard, RAC, Performance Tuning, Security, and Troubleshooting are the most important Oracle DBA interview topics.

Is Oracle DBA still a good career in 2026?

Yes. Oracle DBA remains a strong career path due to the widespread use of Oracle databases in enterprise environments.

What Oracle version should I learn in 2026?

Oracle 19c and Oracle 23ai are the most valuable Oracle database versions to learn in 2026.

Unable to mount NTFS file system in oracle enterprise linux 5

Applies to:

Oracle Enterprise Linux 5.5

Database 11gR2

Description:

I am using Oracle Enterprise Linux 5.5, I am trying to mount a NTFS file system USB drive on linux but unable to succeed and got the following error:

mount -t ntfs /dev/sdb1 /media/usbdrive/

mount: unknown filesystem type 'ntfs'

Solution:

After some research work I found that install the FUSE and NTFS-3G packages to resolve the issue.

You can download the packages from:
http://dag.wieers.com/rpm/packages/fuse-ntfs-3g/
http://packages.sw.be/fuse-ntfs-3g/

To check the package installed or not:

rpm -qa |grep fuse

To install the packages execute the folloiwng:

rpm -ivh fuse-2.6.3-1.el4.rf.x86_64.rpm

rpm -ivh fuse-ntfs-3g-2010.5.22-1.el5.rf.x86_64.rpm

After successfull installation of packages I can mount the NTFS USB drive successfully:

mount -t ntfs-3g /dev/sdb1 /media/usbdrive/

👉 Check our complete guide: Oracle Error Codes Guide

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About the Author

Rana Abdul Wahid is an Oracle Database Administrator (DBA) with expertise in Oracle RMAN recovery, Oracle EBS administration, backup and recovery, performance tuning, database cloning, and troubleshooting critical Oracle database issues.