Oracle命令--修改oracle回话数

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在这里需要提一下的是：Sessions和Processes的关系

Oracle的连接数(sessions)与其参数文件中的进程数(processes)相关，它们的关系如下：

sessions = (1.1*process + 5)

1。查看当前会话数、processes和sessions值，发现session数和2个参数的值已经非常逼近
SQL*Plus: Release 10.2.0.1.0 - Production on 星期一 10月 9 15:50:21 2006Copyright (c) 1982, 2005, Oracle. All rights reserved.

SQL> conn / as sysdba
已连接。SQL> select count(*) from v$session;
COUNT(*)----------
45

SQL> show parameter processes
NAME                                 TYPE        VALUE------------------------------------ ----------- ----------------------aq_tm_processes                      integer     0
db_writer_processes                  integer     1
gcs_server_processes                 integer     0
job_queue_processes                  integer     10
log_archive_max_processes            integer     2
processes                            integer     50

SQL> show parameter sessions
NAME                                 TYPE        VALUE------------------------------------ ----------- ----------------------java_max_sessionspace_size           integer     0
java_soft_sessionspace_limit         integer     0l
icense_max_sessions                 integer     0
license_sessions_warning             integer     0
logmnr_max_persistent_sessions       integer     1
sessions                             integer     60
shared_server_sessions               integer

2。修改processes和sessions值
SQL> alter system set processes=500 scope=spfile;
系统已更改。
SQL> alter system set sessions=500 scope=spfile;
系统已更改。

3。查看processes和sessions参数，但更改并未生效
SQL> show parameter processes
NAME                                 TYPE        VALUE------------------------------------ ----------- ----------------------aq_tm_processes                      integer     0
db_writer_processes                  integer     1
gcs_server_processes                 integer     0
job_queue_processes                  integer     10
log_archive_max_processes            integer     2
processes                            integer     50
SQL> show parameter sessions
NAME                                 TYPE        VALUE------------------------------------ ----------- ----------------------java_max_sessionspace_size           integer     0
java_soft_sessionspace_limit         integer     0
license_max_sessions                 integer     0
license_sessions_warning             integer     0
logmnr_max_persistent_sessions       integer     1
sessions                             integer     60
shared_server_sessions               integer

4。重启数据库，使更改生效
SQL> shutdown immediate
SQL> startup
SQL> show parameter processes
NAME                                 TYPE        VALUE------------------------------------ ----------- ----------------------aq_tm_processes                      integer     0
db_writer_processes                  integer     1
gcs_server_processes                 integer     0
job_queue_processes                  integer     10
log_archive_max_processes            integer     2
processes                            integer     300
SQL> show parameter sessions
NAME                                 TYPE        VALUE------------------------------------ ----------- ----------------------java_max_sessionspace_size           integer     0
java_soft_sessionspace_limit         integer     0
license_max_sessions                 integer     0
license_sessions_warning             integer     0
logmnr_max_persistent_sessions       integer     1
sessions                             integer     335
shared_server_sessions               integer