1.查询数据库当前进程的连接数: <div class="codetitle"><a style="CURSOR: pointer" data="97874" class="copybut" id="copybut97874" onclick="doCopy('code97874')"> 代码如下:<div class="codebody" id="code97874"> select count() from v$process; 2.查看数据库当前会话的连接数: <div class="codetitle"><a style="CURSOR: pointer" data="89588" class="copybut" id="copybut89588" onclick="doCopy('code89588')"> 代码如下:<div class="codebody" id="code89588"> elect count() from v$session; 3.查看数据库的并发连接数: <div class="codetitle"><a style="CURSOR: pointer" data="67561" class="copybut" id="copybut67561" onclick="doCopy('code67561')"> 代码如下:<div class="codebody" id="code67561"> select count(*) from v$session where status='ACTIVE'; 4.查看当前数据库建立的会话情况: <div class="codetitle"><a style="CURSOR: pointer" data="7082" class="copybut" id="copybut7082" onclick="doCopy('code7082')"> 代码如下:<div class="codebody" id="code7082"> select sid,serial#,username,program,machine,status from v$session; 5.查询数据库允许的最大连接数: <div class="codetitle"><a style="CURSOR: pointer" data="88519" class="copybut" id="copybut88519" onclick="doCopy('code88519')"> 代码如下:<div class="codebody" id="code88519"> select value from v$parameter where name = 'processes'; 或者命令:show parameter processes; 6.修改数据库允许的最大连接数: <div class="codetitle"><a style="CURSOR: pointer" data="70766" class="copybut" id="copybut70766" onclick="doCopy('code70766')"> 代码如下:<div class="codebody" id="code70766"> alter system set processes = 300 scope = spfile; (需要重启数据库才能实现连接数的修改) 重启数据库: <div class="codetitle"><a style="CURSOR: pointer" data="97469" class="copybut" id="copybut97469" onclick="doCopy('code97469')"> 代码如下:<div class="codebody" id="code97469"> SQL>shutdown immediate; SQL>startup; 查看当前有哪些用户正在使用数据: <div class="codetitle"><a style="CURSOR: pointer" data="17359" class="copybut" id="copybut17359" onclick="doCopy('code17359')"> 代码如下:<div class="codebody" id="code17359"> SQL>select osuser,a.username,cpu_time/executions/1000000||'s',sql_fulltext,machine SQL>from v$session a,v$sqlarea b SQL>where a.sql_address = b.address SQL>order by cpu_time/executions desc; 备注:UNIX 1个用户session对应一个操作系统process,而Windows体现在线程。 启动oracle <div class="codetitle"><a style="CURSOR: pointer" data="84247" class="copybut" id="copybut84247" onclick="doCopy('code84247')"> 代码如下:<div class="codebody" id="code84247"> su - oracle SQL>sqlplus system/pwd as sysdba //进入sql SQL>startup //启动数据库 SQL>lsnrctl start //启动监听 sqlplus "/as sysdba" SQL>shutdown immediate; //关闭数据库 SQL>startup mount; SQL>alter database open;
(编辑:李大同)
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