during the maintenance facing error

[Nagaraj Shindagi <nagaraj.shindagi@xxxxxxxxx>]

hi

This is nagaraj, while  i am doing the maintenance of the database i am facing this problem, after this error it will stop and i am not able to take backup of the database.

"ERROR:  could not read block 984505 in file "base/16393/2850139.7": read only 4096 of 8192 bytes"

Please help me to solve this issue

thanks in advance

--
Nagaraj V Shindagi