Brief
Oracle was always baffled hang up now record the basic idea
The basic idea
1.xshell connection linux
cd /home/oracle/app/oracle/diag/rdbms/orcl/orcl/trace
2. Check the latest log file
List of Documents
ll *.trc
copy the latest file
cat orcl_vktm_4606
3. Analyze file
common problem
1.ORA-03113: the end of the communication channel file
2. The connection is not released too much
3. Do not automatically release idle connections
4. There is no shared memory
The data is full.