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查询数据库当前进程的连接数: select count(*) from v$process; 查看数据库当前会话的连接数: select count(*) from v$session; 查看数据库的并发连接数: select count(*) from v$session where status='ACTIVE'; 查看当前数据库建立的会话情况: select sid,serial#,username,program,machine,status from v$session; 查询数据库允许的最大连接数: select value from v$parameter where name = 'processes'; 或者:show parameter processes; 查询所有数据库的连接数 selectschemaname,count(*)fromv$sessiongroupbyschemaname; 查询终端用户使用数据库的连接情况。 selectosuser,schemaname,count(*)fromv$sessiongroupbyschemaname,osuser; #修改连接 alter system set processes = value scope = spfile 修改数据库允许的最大连接数: alter system set processes = 300 scope = spfile; (需要重启数据库才能实现连接数的修改) 重启数据库: shutdown immediate; startup; 查看当前有哪些用户正在使用数据: select osuser,a.username,cpu_time/executions/1000000||'s',sql_fulltext,machine from v$session a,v$sqlarea b where a.sql_address = b.address order by cpu_time/executions desc; 备注:UNIX 1个用户session对应一个操作系统process,而Windows体现在线程。 oracle中查询被锁的表并释放session SELECT A.OWNER,A.OBJECT_NAME,B.XIDUSN,B.XIDSLOT,B.XIDSQN,B.SESSION_ID,B.ORACLE_USERNAME, B.OS_USER_NAME,B.PROCESS, B.LOCKED_MODE, C.MACHINE,C.STATUS,C.SERVER,C.SID,C.SERIAL#,C.PROGRAM FROM ALL_OBJECTS A,V$LOCKED_OBJECT B,SYS.GV_$SESSION C WHERE ( A.OBJECT_ID = B.OBJECT_ID ) AND (B.PROCESS = C.PROCESS ) ORDER BY 1,2 释放session Sql: alter system kill session 'sid, serial#' alter system kill session '379, 21132' alter system kill session '374, 6938' 查看占用系统io较大的session SELECT se.sid,se.serial#,pr.SPID,se.username,se.status,se.terminal,se.program,se.MODULE,se.sql_address,st.event,st.p1text,si.physical_reads,si.block_changes FROM v$session se, v$session_wait st,v$sess_io si,v$process pr WHERE st.sid=se.sid AND st.sid=si.sid AND se.PADDR=pr.ADDR AND se.sid>6 AND st.wait_time=0 AND st.event NOT LIKE '%SQL%' ORDER BY physical_reads DESC 找出耗cpu较多的session select a.sid,spid,status,substr(a.program,1,40) prog,a.terminal,osuser,value/60/100 value from v$session a,v$process b,v$sesstat c where c.statistic#=12 and c.sid=a.sid and a.paddr=b.addr order by value desc
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