How to troubleshoot Oracle Server including commands

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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