| ORA-12547: TNS:lost contact while login as sysdba [message #582500] |
Thu, 18 April 2013 21:00  |
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vishwas_samant
Messages: 1
Registered: April 2013
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Junior Member |
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ORA-12547: TNS:lost contact
Identify the issue
truss -aefo sqlplus.trc sqlplus /nolog
connect / as sysdba
Cause I
shared memory or semaphores leftover from previous instances (abnormal termination)
ipcs -a
remove problematic shared memory segments & semaphores
ipcrm -m & ipcrm -s
delete $ORACLE_HOME/dbs/lk<SID> file
Cause II
The /proc file system is not mounted.
Cause III
ulimit settings for 'open files' and 'pipe size' is very low.
$ulimit -n 4096
$ulimit -p 30
Cause IV
The stack limit is set too low.
ulimit -s 32768
Cause V
Invalid LD_LIBRARY_PATH
Set proper LD_LIBRARY_PATH path
Cause VI
dbs folder missing from oracle home
mkdir dbs and then create password & init files
Cause VII
Invalid env variables
echo $ORACLE_HOME
echo $ORACLE_SID
echo $LD_LIBRARY_PATH
echo $PATH
Cause VIII
Wrong file permissions
cd $ORACLE_HOME/bin
ls -l oracle
chmod 6751 oracle
or relink all
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