解决ERROR: ORA-00020: maximum number of processes (150) exceeded

ERROR:
ORA-00020: maximum number of processes (150) exceeded
[oracle@oracle ~]$ ps -ef | grep ora
[oracle@oracle ~]$ kill -9 55928
[oracle@oracle ~]$ kill -9 55804
-bash: kill: (55804) - No such process
[oracle@oracle ~]$ kill -9 55659
[oracle@oracle ~]$ sqlplus / as sysdba
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup nomount;
ORACLE instance started.

Total System Global Area 1536602112 bytes
Fixed Size 2253504 bytes
Variable Size 939527488 bytes
Database Buffers 587202560 bytes
Redo Buffers 7618560 bytes
SQL> show parameter process

NAME TYPE
------------------------------------ ---------------------------------
VALUE
------------------------------
aq_tm_processes integer
1
cell_offload_processing boolean
TRUE
db_writer_processes integer
1
gcs_server_processes integer
0
global_txn_processes integer

NAME TYPE
------------------------------------ ---------------------------------
VALUE
------------------------------
1
job_queue_processes integer
1000
log_archive_max_processes integer
4
processes integer
150
processor_group_name string

SQL> alter system set processes=2000 scope=spfile;

System altered.

SQL> shutdown immediate

SQL> startup