设置 会话的空闲时间 idle_time,清理 SNIPED session

设置允许session 空闲时间

首先要启用 resource_limit参数，默认是false;

SQL> alter system set resource_limit=true scope=both;

System altered.

设置默认profile的 idle_time 10分钟

SQL> alter profile default limit idle_time 10;

Profile altered.

需要重启数据库才能生效

idle_time Specify the permitted periods of continuous inactive time during a session, expressed in minutes. Long-running queries and other operations are not subject to this limit.

A valid database connection that is idle will respond to the probe packet causing no action on the part of the Server, whereas the resource_limit will snipe the session when idle_time is exceeded. The 'sniped' session will get disconnected when the user(or
the user process) tries to communicate with the server again.

查询应用的连接数

SELECT b.MACHINE, b.PROGRAM, COUNT (*)

FROM v$process a, v$session b

WHERE a.ADDR = b.PADDR AND b.USERNAME IS NOT NULL

GROUP BY b.MACHINE, b.PROGRAM

ORDER BY COUNT (*) DESC;

在OS上写kill 脚本清理状态为 SNIPED session

1）查询脚本

[oracle@centos1 ~]$ more sniped_session.sql

rem sniped_session.sql

rem DESCRIPTION

rem kill sniped session

rem MODIFIED

set pagesize 1000

set heads off

set verify off

set heading off

set termout off

set echo off

set feedback off

spool on

spool /opt/app/sql/kill_sniped_session.lst

select 'kill -9 '||spid UNIX_level_kill

FROM v$session s, v$process p

WHERE TYPE = 'USER'

AND p.addr = s.paddr

AND status = 'SNIPED'

AND last_call_et > 60 * 10 ----10分钟

ORDER BY last_call_et desc;

spool off

2）编写kill 脚本

[oracle@centos1 ~]$ more kill_sniped_session.sh

$ORACLE_HOME/bin/sqlplus -s "/ as sysdba"<<!

@sniped_session.sql

exit

!

if [ -s /opt/app/sql/kill_sniped_session.lst ]

then

echo "have a list of sniped_session"

grep kill /opt/app/sql/kill_sniped_session.lst

grep kill /opt/app/sql/kill_sniped_session.lst | awk '{ print $3 }' | xargs kill -9 2>/opt/app/backup/kill_sniped_session.log

fi

if [ $? -ne 0 ]

then

echo "kill sniped session at `date +%y-%m-%d` failure " > /opt/app/backup/kill_failure`date +%y-%m-%d`.log

else

sessions_count=`grep kill /opt/app/sql/kill_sniped_session.lst | wc -l`

echo "kill sniped session at `date +%y-%m-%d` successfull; and total sessions:${sessions_count}" > /opt/app/backup/kill_successfull`date +%y-%m-%d`.log

fi

3） 执行脚本，并查看结果

[oracle@centos1 ~]$ sh kill_sniped_session.sh

[oracle@centos1 backup]$ more kill_successfull12-08-15.log

kill sniped session at 12-08-15 successfull; and total sessions:10