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

杀死所有oracle进程

su - oracle
ps -ef |grep $ORACLE_SID|grep -v grep|awk '{print $2}' | xargs kill -9
ipcs -m | grep oracle | awk '{print $2}' | xargs ipcrm shm
lsnrctl stop
lsnrctl start
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查看当前最大连接数sessions和最大线程数processes

sqlplus / as sysdba
SQL> startup;
SQL> show parameter sessions;

SQL> show parameter processes;
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查看已经使用的连接数sessions和线程数processes

select count(*) from v$session;
select count(*) from v$process;
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修改最大连接数sessions和最大线程数processes

alter system set sessions=2272 scope=spfile;
alter system set processes=1500 scope=spfile;
shutdown immediate;
startup;

修改成功