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 Copyright (c) 1982, , 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
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