oracle中查询数据库锁和解除数据库锁

下面是常用的一些sql

查询锁

select program, t2.username,t2.sid,t2.serial#,t2.logon_time
from v$locked_object t1,v$session t2
where t1.session_id=t2.sid order by t2.logon_time;
 
杀进程
alter system kill session '41,3415';
 
查到此sid连接用户正在执行的SQL语句:
    
select sql_text from v$sqltext_with_newlines where (hash_value,address) 
in (select sql_hash_value,sql_address from v$session where sid=62) order by address,piece;

查询当前会话数

select count(*) from v$session

ORA-28000: the account is locked. 
要对账户解锁，可在数据库管理员账户(sys/system)中使用“alter user”命令的account unlock子句。
如下所示：
alter user username account unlock;

账户解锁后，username 账户再一次被允许连接。

下面是我为了监控数据库情况，根据从网上找的例子，自己改了个小程序，用做告警

查询数据库有超过两分钟的锁进行告警：

package et.wuliu.jk;

import java.sql.ResultSet;
import java.text.SimpleDateFormat;
import java.util.Date;
import ecimpl.ECClient;
import et.common.bs.industry.SuperDMO;
import et.common.vo.itf.InterfaceDefVO;
import et.wuliu.jc.SCMTimerExecutor;

public class GetLockSession extends SCMTimerExecutor {

	/**
	 * 
	 */
	private static final long serialVersionUID = -1252330980599103469L;

	/**
	 * 
	 */

	public GetLockSession(InterfaceDefVO defVO) {
		super(defVO);
		// TODO Auto-generated constructor stub
	}
	@Override
	protected void run() {
		SuperDMO dmo = new SuperDMO("codeseed");
		try {
			dmo.executeSQL("truncate table my_session;");
			dmo.executeSQL("truncate table my_lock;");
			dmo.executeSQL("truncate table my_sqltext;");
			dmo.executeSQL("insert into my_session " +
					" select a.username,a.sid,a.serial#,a.lockwait,a.machine,a.status,"+
					" a.last_call_et,a.sql_hash_value,a.program from v$session a " +
					" where nvl(a.username,'NULL')<>'NULL'; ");
			dmo.executeSQL("insert into my_lock  select id1,kaddr,sid,request,type from v$lock;");
			dmo.executeSQL("insert into my_sqltext select hash_value , sql_text  from v$sqltext s, my_session m   where s.hash_value=m.sql_hash_value;");
			
			//查询锁表个数
			dmo.execute("select count(*)  from my_session a, my_lock b  where" +
					" b.id1 in (select distinct e.id1   from my_session d, my_lock e  where d.lockwait = e.kaddr)and a.sid = b.sid  and b.request=0 " +
					" and a.last_call_et >(60*2);");
			ResultSet rs1 = dmo.getQueryResult();
			int locktable = 0;
			if(rs1.next()){
				locktable = rs1.getInt(1);
			}
			int waitCount = 0;
			SimpleDateFormat sm = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
			String d = sm.format(new Date());
			//正在等待的数量
			if(locktable >0){
				dmo.execute("select count(*)  from my_session a, my_lock b  where a.lockwait = b.kaddr and a.last_call_et>(60*2);");
				ResultSet rs2 = dmo.getQueryResult();
				if(rs2.next()){
					waitCount = rs2.getInt(1);
				}
				dmo.executeSQL("update my_messts m set m.ists = (m.ists+1)");
			}else{
				//查询临时表是否已经有信息了
				dmo.execute("select * from my_messts");
				//提醒周期
				int txzq = 0;
				ResultSet rs3 = dmo.getQueryResult();
				if(rs3.next()){
					txzq = rs3.getInt(1);
				}
				if(txzq >0){
					SendMsg("提示：NCDB数据库等待锁已全部释放！时间："+d);
					dmo.executeSQL("update my_messts m set m.ists = 0");
				}
			}
			
			dmo.execute("select * from my_messts");
			//提醒周期
			int txzq = 0;
			ResultSet rs3 = dmo.getQueryResult();
			if(rs3.next()){
				txzq = rs3.getInt(1);
			}
			if((txzq % 10 == 0 && txzq >0) || txzq == 1){
				SendMsg("数据库等待锁告警：锁表个数："+locktable+"；等待锁个数："+waitCount+"；已扫描次数："+(txzq / 10)+"，时间："+d);
			}
		} catch (Exception e) {
			
		} finally{
			dmo.close();
		}
	}
	
	public static void SendMsg(String mess) throws Exception {
		ECClient ec = new ECClient();
		ec.loc.setECManagementServiceSOAPEndpointAddress(ec.ecaddress);
		ec.stub = ec.loc.getECManagementServiceSOAP();
		ec.sendSMS("13501233302",mess);
    }

}