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Slow listener start up and slow connecting / as sysdba - 11.2.0.4 on AIX 7.1

edited Apr 25, 2016 1:34PM in Database Administration (MOSC) 4 commentsAnswered

Hello everyone

We have a 11g R2 database on AIX 7.1

Yesterday we had an issue where we noticed the following 3 symptoms on a database that was working fine

until yesterday

1. sqlplus / as sysdba was taking a long time .. appx 10 - 15 seconds

2. Starting up listener was taking a long time .. appx 20 secs or more

3. conneting to the database using tnsnames.ora started giving following error  (please note that we use IP address in the tnsnames.ora and not the host names)

   ORA-03135: connection lost contact

   Process ID: 0

   Session ID: 0 Serial number: 0

After troubleshooting found out that the DNS server was replaced by a new DNS server but they forgot to change that in /etc/resolv.conf file. Once it was fixed, i.e. new DNS Server IP was recorded in that file, everything started

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