An example of Oracle fault analysis and processing encountered in work

Oracle
Case Category: Vas network System type: Cmode system version: Hardware: SUN software: All version case title: The database in the Cmode put the lock processing method failure phenomenon: Start the sam_cmode process is not normal processing work orders. Fault Description: Start the discovery in Sam_cmode–d sam_cmode always process a user.
Connected
4c 4f MB 4e 3a 4e 4d 22
The 6a 2c (4f) 3d 22
6a to 0d 0a
Send:login:username= "UTBJ", password= "utbj123"

Recv:login:result=0

Connect Cmode successful!
4c (3a) A (m)
0d 0a
Send DEL 08518743210:
A connection break or timeout in recv
Commu Err When Delete event
Failure Analysis: Manually delete the user record in the Cmode database and find no feedback from Oracle.
(An Oracle integrity constraint error is normally present.) Ora-02292:integrity constraint (pdxdba. Fk_tsignup_userid) Violated-child record found)
Initial suspicion the user record in the Tcontract table is locked.

By querying Oracle's view, it is found that a user is currently updating the user record and that there are many update actions that have not been commit.
Sql> Select A.serial#,a.sid,c.sql_text,a.program from v$session a,v$locked_object b,v$sqltext C where a.sid=b. session_id and c.sql_text like ' update tcontract set% ' and a.program like ' sqlplus% ' order by A.sid;

Update tcontract set lstatus= ' E ' where tel= ' 08518743210 '
Sqlplus@gz_signup (TNS v1-v3)

14895 234
Troubleshooting: Kill these sessions with Oracle commands. Reboot the Sam_cmode and signup modules.
Alter system kill session ' 234,14895 ';
Daily Maintenance: 1. The maintenance staff try not to manually modify the data in the Cmode database.
2. Execute the commit operation in time after the modification is confirmed correctly.