You may get an error while installing or update packages using YUM command on Linux system, 

Error: database disk image is malformed.
 

# yum install bridge-utils -y



Loaded plugins: fastestmirror, refresh-packagekit, security

Setting up Install Process

Loading mirror speeds from cached hostfile

....

....

Error: database disk image is malformed

Clean your dbcache using below command,

solution:
 
# yum clean dbcache


Loaded plugins: fastestmirror, refresh-packagekit, security

Cleaning repos: base epel extras updates

8 sqlite files removed


Now you can try to install any softwares on your system by yum command,

yum install bridge-utils -y