SQL> alter tablespace XNCBS add datafile '+DATRP' SIZE 5g  autoextend on next 200M

ERROR at line 1:

ORA-00059: maximum number of DB_FILES exceeded

SQL> SELECT name, issys_modifiable from v$parameter where name ='db_files';

NAME

--------------------------------------------------------------------------------

ISSYS_MOD

---------

db_files

FALSE

這裡必須重啟才能生效

CDB裡面改了就可以

SQL> show parameter db_files

NAME                                        TYPE       VALUE

------------------------------------ ----------- ------------------------------

db_files                            integer   200

SQL> alter system set db_files=400 scope=spfile;

System altered.

SQ>

SQL> shutdown immediate

Database closed.

Database dismounted.

ORACLE instance shut down.

SQL> startup

ORACLE instance started.

Total System Global Area 4.9661E+10 bytes

Fixed Size             30040104 bytes

Variable Size              1.7985E+10 bytes

Database Buffers    3.1541E+10 bytes

Redo Buffers               104173568 bytes

Database mounted.

Database opened.

SQL> show pdbs

    CON_ID CON_NAME                            OPEN MODE  RESTRICTED

---------- ------------------------------ ---------- ----------

         2 PDB$SEED                       READ ONLY  NO

         3 PJNCS1                      READ WRITE NO

         4 PJDCS2                      READ WRITE NO

SQL> show parameter db_files

NAME                                        TYPE       VALUE

------------------------------------ ----------- ------------------------------

db_files                            integer   400

SQL> alter session set container=PJDYCS1 ;

Sssion altered.

SQL> show parameter db_files

NAME                                        TYPE       VALUE

------------------------------------ ----------- ------------------------------

db_files                            integer   400

SQL>