🧩 ORA-19510: Failed to Set Size of File

🧩 Introduction

The Oracle error ORA-19510: failed to set size of file appears during RMAN backup, restore, or datafile creation operations when Oracle fails to allocate or resize a file at the OS or storage level. It’s often linked with I/O, filesystem, or storage space issues. This error typically halts the operation until space or configuration problems are fixed.

Root causes

1. Insufficient free space in the target destination (filesystem or ASM).

2. OS-level file size limits (especially on 32-bit systems or old filesystems).

3. Inconsistent or incorrect file size specified in backup/restore controlfile.

4. NFS or mounted storage not supporting large file allocation.

5. ASM or raw device configuration errors.

6. Disk quota limits for the Oracle OS user.

7. Corrupted controlfile metadata or interrupted restore operations.

How to diagnose

1. Check the full error stack in the alert log or RMAN output.

Look for accompanying messages like ORA-27072, ORA-19502, or Linux error: 28 (No space left on device).

2. Confirm available space on the target mount:

df -h /u01

3. Inspect filesystem type and mount options:

mount | grep /u01

Ensure it supports large files (largefile option for ext4, xfs, etc.).

4. Verify permissions and ownership:

ls -ld /u01

5. If using ASM, check diskgroup free space:

SELECT name, total_mb, free_mb FROM v$asm_diskgroup;

6. Review the file size Oracle attempted to allocate:

SELECT name, bytes/1024/1024 AS size_mb FROM v$datafile;

7. Check OS-level file size limits:

ulimit -a

Solutions (step-by-step)

1. Free up or expand storage space

Delete unnecessary files or increase filesystem/diskgroup capacity.

df -h

If low on space, move backups or logs to another location.

2. Check file permissions and path

Ensure the Oracle user has full write access to the path:

chown oracle:dba /u01/backup

chmod 775 /u01/backup

3. Verify file system supports large files

For ext3, mount with -o largefile. For NFS, ensure it’s mounted with nolock,vers=3 or higher.

4. If ASM is used, rebalance or add disks:

ALTER DISKGROUP DATA ADD DISK '/dev/sdc1' NAME DATA_03;

5. If controlfile expects incorrect size, correct it manually:

ALTER DATABASE DATAFILE '/u01/oradata/prod/users01.dbf' RESIZE 100M;

6. Run RMAN crosscheck and validate to sync metadata:

RMAN> CROSSCHECK BACKUP;

RMAN> VALIDATE DATABASE;

7. Re-run the failed operation after ensuring space and permissions are correct.

Example scenario

During a backup restore, you see:

ORA-19510: failed to set size of file

ORA-27072: File I/O error

Linux-x86_64 Error: 28: No space left on device

Investigation shows /u01/backup is 100% full. After clearing old logs and rerunning the restore, it completes successfully.

Best practices to prevent ORA-19510

• Monitor disk space and ASM free MB regularly.

• Separate backup destinations from database datafiles.

• Implement automatic cleanup scripts for old backup logs.

• Avoid restoring to temporary or limited NFS mounts.

• Schedule RMAN VALIDATE and space checks weekly.

• Enable OS monitoring for filesystem thresholds (e.g., via cron or cloudwatch).

Conclusion

ORA-19510: failed to set size of file is a space or allocation issue during file creation or restore. Fixing storage availability, mount configuration, or file size limits typically resolves it. Proactive disk monitoring and clean-up policies can prevent this error from interrupting critical operations.