If you are getting this error: WordPress Database Error Got Error 28 from Storage Engine for Query that means that you are running out of disk space.

To check your free disk space use this command.

df -h

 

The output should look like this

[root@orbisius vhosts]# df -h
Filesystem      Size  Used Avail Use% Mounted on
devtmpfs        2.0G     0  2.0G   0% /dev
tmpfs           2.0G     0  2.0G   0% /dev/shm
tmpfs           2.0G   14M  2.0G   1% /run
/dev/vda         20G   14G  5.4G  72% /
tmpfs           2.0G     0  2.0G   0% /sys/fs/cgroup
tmpfs           2.0G     0  2.0G   0% /media

This is output is from my VPS server from DigitalOcean.

The size of the drive is 20GB and currently used disk space is 14GB and the free one is 5.4GB.

the -h or --human-readable print sizes in human readable format (e.g., 1K 234M 2G)

 

This is the help text of the df command

[root@orbisius vhosts]# df --help
Usage: df [OPTION]... [FILE]...
Show information about the file system on which each FILE resides,
or all file systems by default.

Mandatory arguments to long options are mandatory for short options too.
-a, --all             include dummy file systems
-B, --block-size=SIZE  scale sizes by SIZE before printing them.  E.g.,
`-BM' prints sizes in units of 1,048,576 bytes.
See SIZE format below.
--direct          show statistics for a file instead of mount point
--total           produce a grand total
-h, --human-readable  print sizes in human readable format (e.g., 1K 234M 2G)
-H, --si              likewise, but use powers of 1000 not 1024
-i, --inodes          list inode information instead of block usage
-k                    like --block-size=1K
-l, --local           limit listing to local file systems
--no-sync         do not invoke sync before getting usage info (default)
-P, --portability     use the POSIX output format
--sync            invoke sync before getting usage info
-t, --type=TYPE       limit listing to file systems of type TYPE
-T, --print-type      print file system type
-x, --exclude-type=TYPE   limit listing to file systems not of type TYPE
-v                    (ignored)
--help     display this help and exit
--version  output version information and exit

Display values are in units of the first available SIZE from --block-size,
and the DF_BLOCK_SIZE, BLOCK_SIZE and BLOCKSIZE environment variables.
Otherwise, units default to 1024 bytes (or 512 if POSIXLY_CORRECT is set).

SIZE is an integer and optional unit (example: 10M is 10*1024*1024).  Units
are K, M, G, T, P, E, Z, Y (powers of 1024) or KB, MB, ... (powers of 1000).

Report df bugs to bug-coreutils@gnu.org
GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>
Report df translation bugs to <http://translationproject.org/team/>
For complete documentation, run: info coreutils 'df invocation'
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