oracle dynamic set,启动/关闭 dynamic view

set ORACLE_BASE=D:oracle

set ORACLE_SID=orcl

set ORACLE_HOME=D:oracle

emctl start/stop/status dbconsole

shutdown -abort

- immediate

- transactional

- normal

sqlplus scott/tiger  as sysdba

shutdown immediate

startup

dynamic performance view:

select sql_text, executions from v$sql

where cpu_time >200000;

select * from v$session where machine = 'd52'  and logon_time>sysdate-1;

select sid, ctime from v$lock where block>0;

今天发现开了dbconsole就连不上数据库，查了一下发现是连接数设的太小了：

selectcount(*)fromv$process--当前的连接数selectvaluefromv$parameterwherename='processes'--数据库允许的最大连接数修改最大连接数:altersystemsetprocesses=300scope=spfile;

重启数据库:shutdownimmediate;

startup;--查看当前有哪些用户正在使用数据SELECTosuser, a.username,cpu_time/executions/1000000||'s', sql_fulltext,machinefromv$session a, v$sqlarea bwherea.sql_address=b.addressorderbycpu_time/executionsdesc;