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UNIX df command in Oracle

Oracle Database Tips by Donald BurlesonSeptember 20, 2015

Viewing File System Space and Inode Usage

The df commandallows you to investigate the space usage on file systems in several different ways.  Without any options, df is the disk usage in 1k blocks for all file systems currently mounted.

# df

Filesystem           1K-blocks      Used Available Use% Mounted on
                       9014656   7606072    943280  89% /
/dev/hda1               101086     11871     83996  13% /boot
tmpfs                   517620         0    517620   0% /dev/shm
4128448   3621320    297416  93% /u01
                       3096336   1687792   1251260  58% /u02
2031952    147632   1781104   8% /u03

The output includes the device mounted, the total amount of space, space used, space free, and a percentage of space currently used.  The directory that the device is mounted on is listed last.

To make this information easier to interpret, add the -h (human readable) option that instead uses K, M and G in the output to indicate kilobytes, megabytes and gigabytes.

# df -h

Filesystem            Size  Used Avail Use% Mounted on
                      8.6G  7.3G  922M  89% /
/dev/hda1              99M   12M   83M  13% /boot
tmpfs                 506M     0  506M   0% /dev/shm

                      4.0G  3.5G  291M  93% /u01
3.0G  1.7G  1.2G  58% /u02
                      2.0G  145M  1.7G   8% /u03

To get information on only a specific file system, specify the mount pointas an option.

# df -h /u01

Filesystem            Size  Used Avail Use% Mounted on
                      4.0G  3.5G  291M  93% /u01
This will also work on any sub-directory on the mount point.  A sub-directory can be specified or even the current directory ‘.’ used to check for space.

# df -h /u01/app
Filesystem            Size  Used Avail Use% Mounted on
                      4.0G  3.5G  291M  93% /u01
# pwd
# df -h ./
Filesystem            Size  Used Avail Use% Mounted on
                      8.6G  7.3G  922M  89% /
The df command can also be used with the -i option to examine inode usage.

# df -i /u01

Filesystem            Inodes   IUsed   IFree IUse% Mounted on
                      524288   42686  481602    9% /u01
As with space usage, df reports total inodes, inodes used, inodes free, and a percentage used for a file system.  If inode usage hits 100%, no more new files are able to be created.  The symptoms seem just like a full disk, but df -h shows space available.

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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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