While you are trying to open alert_SID.log file with vi editor you may hit ex: 0602-101 Out of memory saving lines for undo  error message,

# cd /u01/app/oracle/admin/DB_NAME/bdump

# vi alert_SID.log

ex: 0602-101 Out of memory saving lines for undo.

So you can use below syntax to can open your alert.log :

export EXINIT=”set ll=80000000″

Reference:
Hints and tips when using vi on AIX

 

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