SQL效率问题， SQL code 1.用top看下那个进程占cpu资源比较多，记下SPID， 2：查询当前耗时的会话ID，用户名，sqlID等： select sid,serial#,machine,username,program,sql_hash_value,sql_id, to_char(logon_time,'yyyy/mm/dd hh24:mi:ss') as login_time from v$session where paddr in (select addr from v$process where spid in ('5648612','256523')); 3：如果上一步sql_id或者 hash_value不为空，则可用v$sqlarea查出当前正在使用的sql select * from v$sql where sql_id=''

select s.sid,s.serial#,p.program,p.spid from v$session s,v$process p
where s.paddr=p.addr /*and p.spid='&sid'*/;

/*get_sql_by_sid.sql*/
select sql_text from v$sqltext a where a.hash_value in
(select sql_hash_value from v$session b /*where b.sid='&sid'*/)
order by piece asc;

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