ORA-00376: file cannot be read at this time

I got ” ORA-00376: file cannot be read at this time ” error in Oracle database.

 

ORA-00376: file cannot be read at this time

 

Details of error are as follows.

ORA-00376:   File %s cannot be read at this time

Cause: attempting to read from a file that is not readable. 
Most likely // the file is offline.

Action: Check the state of the file. Bring it online 

ORA-00376: file 9 cannot be read at this time
ORA-01110: data file 9: '/u01/test.dbf'
ORACLE Instance PROD (pid = 8) - Error 376 encountered while recovering transaction (25, 37) on object 109359.
Tue Jul 12 10:35:46 2011


    

 

 

file cannot be read at this time

This ORA-00376 errors are related with the attempting to read from a file that is not readable.

 

Datafile has gone offline. To confirm, run the queries below:

SQL>Select status,file#,name from v$datafile where file#={file value reported in ORA-01110}


SQL> Select status,file#,name from v$datafile where file#=9     STATUS  FILE#    NAME     ---------- ------- --- ---------     Recover  9      /u01/test.dbf  
SQL>column checkpoint_change# format 99999999999999999 SQL>select file#, status, fuzzy, checkpoint_time, checkpoint_change#, resetlogs_change#, resetlogs_time from v$datafile_header where file#=9 FILE# STATUS FUZ CHECKPOIN CHECKPOINT_CHANGE# RESETLOGS_CHANGE# RESETLOGS ---------- ------- --- --------- ------------------ ----------------- --------- 9 OFFLINE YES 20-JUL-11 8517808305328 4263932 21-JUN-11

Note: checkpoint_change# is the SCN at which your datafile is current at. In tis case it’s 8517808305328. So we need to apply changes above this SCN number, 8517808305328,  to bring the file online.

 

1. When Database is in ARCHIVELOG Mode

When the database is running in ARCHIVELOG mode we can recover and online the datafile as long as all the archivelogs starting from when the datafile went offline are available for use

Step a

Find the archive log which contains this SCN. You would need the archive log from this sequence number till the current changes in the database. Note you need to add 1 as we need to apply changes after this SCN:

SQL>Select sequence#,name from v$archived_log where
    {Checkpoint change# of the file from query1} + 1 between first_change# and next_change# ;


SQL>Select sequence#,name from v$archived_log where 8517808305328 + 1 between first_change# and next_change# ;


SEQUENCE# NAME
--------------------------------------------------------------------------------

68  /u01/app/archivelog/O1_MF_1_68_72FLC6FO_.ARC

So you need changes from sequence 68 till current redo to be present to recover this file

Step b

Ensure you have all the archivelogs starting from the time the datafile went offline:
SQL>Select name,sequence# from v$archived_log where sequence# >=68 ;

 

 

If v$archived_log returns no rows then possibly the sequence information is present in the redo log and it has not been archived yet or the information in control file has been overwritten. To find if the checkpoint_change# (SCN) is in the redo logs you can run:

SQL> Select sequence# from v$log_history where 8517808305328 + 1 between first_change# and next_change# ;

SEQUENCE#
----------
68



SQL> Select a.member ,a.group# ,b.status,sequence#  from v$logfile a ,v$log b
      where sequence# >=68 and a.group#=b.group# ;
  
Step c
Once you’ve confirmed that all archivelogs are available on disk you can proceed with recovery and online the datafile:

 

SQL> recover datafile 9;
ORA-00279: change 8517808305328 generated at 07/20/2011 14:45:13 needed for
thread 1
ORA-00289: suggestion :
/u01/app/archivelog/O1_MF_1_68_%U_.ARC

ORA-00280: change 8517808305328 for thread 1 is in sequence #68

Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
auto
Log applied.
Media recovery complete.

SQL>Alter database datafile 9 online ;

SQL>Select * from v$recover_file ;

Will show no entry for file 9.

 

2. When Database is in NOARCHIVELOG Mode

For databases running in NOARCHIVELOG mode the redo log information gets overwritten. So if the redo logs information for the sequence number that is required has been overwritten then you cannot bring the file online . If the datafile contains important data explore option of restoring the last good cold backup or explore options of getting the data present in datafile from some other means For example previous export

If the sequence required for the recovery has not been overwritten and is still present in the redo logs you can do the following

SQL> Select sequence# from v$log_history where 8517808305328 + 1 between first_
change# and next_change# ;

SEQUENCE#
----------
68

Select a.member ,a.group# ,b.status,sequence# from v$logfile a ,v$log b
where sequence# >=68 and a.group#=b.group# ;


SQL> Select a.member ,a.group# ,b.status,sequence# from v$logfile a ,v$log b
2 where sequence# >=68 and a.group#=b.group# ;

MEMBER
-----------------------------------------------------------------------------

GROUP# STATUS SEQUENCE#
---------- ---------------- ----------
/u01/oradata/test/REDO02.LOG
2 INACTIVE 67

/u01/oradata/test/REDO01.LOG
1 CURRENT 68


SQL>recover datafile 9 ;

When prompted for recovery Enter the path of the redo having sequence 68

/u01/oradata/test/REDO02.LOG

Hit Enter

Once its recovery

SQL>Alter database datafile <fileno> online ;

 

 

Do you want to learn Oracle Database for Beginners, then read the following articles.

Oracle Tutorial | Oracle Database Tutorials for Beginners ( Junior Oracle DBA )

 

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About Mehmet Salih Deveci

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