Today when I tried to open my db (that db was created and lunched inside container) I saw ORA-03113: end-of-file on communication channel. SQL> startup ORACLE instance started. Total System Global Area 3.4206E+10 bytes Fixed Size 2270360 bytes Variable Size 3422554984 bytes Database Buffers 3.0736E+10 bytes Redo Buffers 45649920 bytes Database mounted. ERROR at line 1: ORA-03113: end-of-file on communication channel Process ID: 11344 Session ID: 380 Serial number: 3 There is a lot of reason can be, after check it out from the forum all I need is clear unarchivelog. First start instance mount mode. SQL> startup mount ORACLE instance started. Total System Global Area 3.4206E+10 bytes Fixed Size 2270360 bytes Variable Size 3422554984 bytes Database Buffers 3.0736E+10 bytes Redo Buffers 45649920 bytes Database mounted.Database mounted. -check how many group we have: SQL> set linesize 200 SQL...