Troubleshooting an Oracle Server can be a complex process that requires a good understanding of Oracle Database and various tools available to diagnose and resolve issues. Here are some steps and commands that can help you troubleshoot an Oracle Server:
Check the Oracle alert log file: The Oracle alert log file contains a record of all important events in the database. You can use the following command to view the last 50 lines of the alert log file:
$ tail -n 50 $ORACLE_HOME/diag/rdbms/<database_name>/<SID>/trace/alert_<SID>.log
Check the Oracle listener log file: The Oracle listener log file contains information about client connections and errors. You can use the following command to view the listener log file:
$ tail -n 50 $ORACLE_HOME/diag/tnslsnr/<hostname>/<listener_name>/trace/listener.log
Check the Oracle database alert log view: You can use the following SQL command to view the database alert log view:
$ select * from v$diag_info where name='Default Trace File';
Check the Oracle database alert history: You can use the following SQL command to view the database alert history:
$ select * from dba_hist_alert_history order by alert_timestamp desc;
Check the Oracle database sessions: You can use the following SQL command to view the database sessions:
$ select sid, serial#, username, status, machine, program from v$session;
Check the Oracle database locks: You can use the following SQL command to view the database locks:
$ select * from v$lock;
Check the Oracle database tablespaces: You can use the following SQL command to view the database tablespaces:
$ select * from dba_tablespaces;
Check the Oracle database data files: You can use the following SQL command to view the database data files:
$ select * from dba_data_files;
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Thanks a lot for your sharing.
Only issue might be ORALCE_HOME should be ORACLE_BASE,