Database Tuning (MOSC)

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Database server hang and users cannot connect

edited Apr 4, 2013 8:42PM in Database Tuning (MOSC) 1 commentAnswered
Hello,

We have four database instances on same production server. There are four different applications..yesterday and today we the following issues and have to restart the database server.

1. database connection issue. ORA-12545:Connect failed because target host or object does not exist”. from all client sides
2.ora-12518 error in all  listener log file.

3. DB server memory leak, the free memory is 0

4. the applications run very slow and some users cannot connect to database at all.

5. tnsping from all client sides show slow responding or no responding for all all TCP ports for all 5 listeners.

6. we cannot remote login db server, sqlplus from client side is ok sometimes. we have to restart the whole server to fix the problem for urgent.

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