ORA-03113: end-of-file on communication channel Fixed and Troubleshooting

Hi Friends,

Recently we faced this issue which was very critical. It is very general ora alert which almost time we can ignore but sometimes it is very critical which I have mentioned below the criticality.

ORA-03113: end-of-file on communication channel

This error can occur at the time such as:

1. While we are starting the oracle database.

2. While making any connection with database.

3. While running any SQL/PLSQL queries.

4. While mounting the database.

5. While recovering the database.

6. While opening database through Alter command.

7. While connecting as SYSDBA.

This error ORA-03113: end-of-file on communication channel occurs while a client process trying to connect a oracle database.

Above alert can be because of Network issue also.

Or may be server process was killed by some other users at OS level.

This can cause other ora alerts also such as: ora-1041, ora-3114, ora-1012 etc.

These all are like disconnection of the client from oracle database.

Here, I will show you as example while startup the oracle database we faced this below issue:

SQL> startup

ORACLE instance started.

Total System Global Area 2147483648 bytes

Fixed Size 2926472 bytes

Variable Size 1224738936 bytes

Database Buffers 905969664 bytes

Redo Buffers 13848576 bytes

Database mounted.

ORA-03113: end-of-file on communication channel

Process ID: 1919

Session ID: 326 Serial number: 62214

There may be many reasons as below:

1. May be redo log file system has full; and there is 0% space free.

Solution: 

For this, we can clean up the old redo log file system and again startup the database.

OR

We can move the old redo logs file system to new location file system by which there space can available and we can try to startup the database.

If above check is fine then we can check the alert log, from there we can check the exact error. And will be helpful for future investigations.

In case, If getting error during the connecting as SYSDBA then need to check below points such as:

1. Check for environments file properly.

2. Check for LD_LIBRARY_PATH entries and setting should be properly.

3. Check for correct ORACLE_SID and ORACLE_HOME path.

4. And may be needed to check some more as per alert log error and details.

And others many more may also reason... for more info: Doc ID 1506805.1

Hope these above points clear and helpful. Please let us know for any concerns and suggestions.

Some more useful links:

ORACLE Troubleshooting Tips

How to Create Custom Schema in R12.2

How to Restart Failed Patch

Jobs Tips

 

Regards,

ora-data Team.