Oracle 11g Manual removal of tablespace files results in database error handling methods

The simple reason: When the diagram is convenient to not enter the database, directly in the datafile directory to delete the table space corresponding data file

result in subsequent database error and cannot delete table space

errors are as follows;
Ora-01116:error in Opening database * * * *
Ora-01110:data file: '/home3/datafile/arrange/newarrange.dbf '
Ora-27041:unable to open File
Linux error:2: No Such file or directory
Additional Information:3

ALTER DATABASE datafile '/HOT/ORADATA/SMSDBMT_INDX01.DBF ' offline drop;
ALTER DATABASE datafile '/HOT/ORADATA/SMSDBMT_INDX01.DBF ' offline drop
*
ERROR at line 1:
Ora-01516:nonexistent log file, data file, or temporary file
"/HOT/ORADATA/SMSDBMT_INDX01.DBF"

Workaround:

1, close the database first

sql> Shutdown Immediate-----error

sql> Shutdown Abort--Deactivate database

2. Start the database to mount mode

Sql>startup Mount

Sql>alter database datafile '/hot/oradata/smsdbmt_indx01.dbf ' offline drop; -----Delete tablespace File succeeded

3. Open the Database

Sql>alter database open;

4. Delete Table space

Sql>drop tablespace smsdbmt_indx including contents and datafiles;---delete table spaces

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Oracle 11g Manual removal of tablespace files results in database error handling methods