1、修改会话数

查询数据库当前进程的连接数：
select count(*) from v$process;

修改数据库允许的最大连接数：
alter system set processes =1500 scope = spfile;
(需要重启数据库才能实现连接数的修改)

2、GRID安装出错如何删除

su - grid

cd /dev/oracleasm/disks

rm -rf vote*

cd /dev/disk/by-label

rm -rf vote*

ll /g01

rm -rf *

chown -R grid:oinstall  /g01

rm /etc/oracle/ocr.loc

rm -rf /etc/ora*

ps -ef |grep oha

kill -9 47495

cd /etc/init.d

ls *oha*

rm -rf *oha*

cd /etc/rc3.d

rm -rf S96ohasd

cd /etc/rc5.d

rm -rf S96oha*

oracleasm scandisks

oracleasm listdisks

oracleasm querydisk /dev/mapper/*

dd if=/dev/zero of=/dev/mapper/sc-vote-hpp1 bs=1M count=300

dd if=/dev/zero of=/dev/mapper/tc-vote-hpp1 bs=1M count=300

dd if=/dev/zero of=/dev/mapper/yd-vote-netappp1 bs=1M count=300

3、rac集群启停

停止rac

oracle用户

  181  srvctl status database -d prod

  182  srvctl stop database -d prod

  183  srvctl status database -d prod

 root用户

./crsctl start has  高可用

cd /g01/11ggrid/app/11.2.0/grid/bin

 ./crsctl check cluster -all

 ./crsctl stop cluster -all

 ./crsctl check cluster -all

 ./crs_stat -t -v

  reboot

开始rac

root用户

  975  cd /g01/11ggrid/app/11.2.0/grid/bin  

  977  ./crsctl start cluster -all

  978  ./crsctl check cluster -all

  980  ./crsctl status resource  -t

oracle用户

[oracle@sc-rac1 ~]$srvctl start  database -d prod

[oracle@sc-rac1 ~]$ srvctl status  database -d prod

Instance prod1 is running on node sc-rac1

Instance prod2 is running on node sc-rac2

Instance prod3 is running on node tc-rac1