Ora-00059 exceeds DB_ Files limit

database ：oracle 11.2.0.4
Problem description ： Error in adding data file ORA-00059, as follows ：
SQL> alter tablespace LOGIS add datafile '+DGDSDB' size 31g;
alter tablespace LOGIS add datafile '+DGDSDB' size 31g
*
ERROR at line 1:
ORA-00059: maximum number of DB_FILES exceeded
SQL> show parameter db_files;
NAME TYPE VALUE

------------------------------------ -------------------------------- ------------------------------
db_files integer 200
SQL> select count(*) from v$datafile;
COUNT(*)
----------
200
Abnormal reason ： The maximum number of data files has been reached , Need to be revised db_files Parameters .
Solution ：
Sql>alter system set db_files=1000 scope=spfile;
Restart the database , Parameters will take effect .