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ORA-1115: I/O ERROR READING BLOCK (Doc ID 1013621.6)

Last updated on NOVEMBER 21, 2023

Applies to:

Oracle Database Backup Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Cloud Service - Version N/A and later
Oracle Database - Enterprise Edition - Version 7.0.16.0 and later
Oracle Database Cloud Schema Service - Version N/A and later
Information in this document applies to any platform.

Purpose

 An ORA-01115 is issued whenever Oracle is unable to read from an open 

datafile because of an I/O error: 
 
 ORA-01115: "IO error reading block from file %s (block # %s)" 
     Cause: Device on which the file resides is probably offline 
    Action: Restore access to the device 
 
ORA-01115 errors are usually followed by: 
 
- an ORA-01110 error
- an operating system level Oracle error message such as ORA-0737X 
- an operating system error (e.g., error# 5 in Unix)

Troubleshooting Steps

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