ORA-01033: ORACLE initialization or shutdown in process

ORA-01033: ORACLE initialization or shutdown in process
Oracle encountered a problem: after entering the user name and password in PL/SQL, a title error occurred. I have not backed up all the database databases in a project, and there is still a lot of data, this won't let me reload the database. Think of this stream I sweated. I checked my article on the Internet and found a solution. It really broke my sweat. This problem is mostly caused by the loss of database files. After Oracle is started, the user logs on to load the original configuration information in the solution. During the loading process, an error is reported because the location specified by the original file is not found. the following is a solution I found on the Internet: Go to dos: Log On as A DBA user. The specific command is sqlplus/NOLOGSQL> connect sys/change_on_install as sysdba prompt: successful SQL> shutdown normal prompt: the database has been closed and the unmounted database ORACLE routine has been closed SQL> startup mount prompt: ORACLE routine has started Total System Global Area 118255568 bytesFixed Size 282576 bytesVariable Size 82886080 bytesDatabase Buffers 33554432 bytesRedo Buffers 532480 bytes database installation Loaded SQL> alter database open; prompt: Row 1st error: ORA-01157: unable to identify/lock data file 19-see DBWR trace file ORA-01110: Data File 19: '''c: \ oracle \ oradata \ oradb \ FYGL. ORA ''the file part is slightly different depending on your situation. Continue to input SQL> alter database datafile 19 offline drop; prompt: the database has been changed. Loop through the last two steps until alter database open; then no error is prompted, "the database has been changed ". Then enter SQL> shutdown normal prompt: the database has been closed, the database has been uninstalled, the ORACLE routine has been closed, and the SQL> startup prompt: the ORACLE routine has started the Total System Global Area 118255568 bytesFixed Size 282576 bytesVariable Size 82886080 bytesDatabase Buffers 33554432 bytesRedo Buffers 532480 bytes database load is complete and it should be okay to log on!