非常好用的sql语句(日常整理)

1. /* 得到trace文件路径和名称 */

select d.value
    || '/'
    || lower (rtrim (i.instance, chr (0)))
    || '_ora_'
    || p.spid
    || '.trc' trace_file_name
 from (select p.spid
     from v$mystat m, v$session s, v$process p
     where m.statistic# = 1 and s.sid = m.sid and p.addr = s.paddr) p,
    (select t.instance
     from v$thread t, v$parameter v
     where v.name = 'thread'
      and (v.value = 0 or t.thread# = to_number (v.value))) i,
    (select value
     from v$parameter
     where name = 'user_dump_dest') d

2./* 显示产生锁定的sql语句 */

select /*+ no_merge(a) no_merge(b) no_merge(c) */ a.username, a.machine, a.sid,a.serial#, a.last_call_et "seconds", b.id1, c.sql_text "sql" from v$session a, v$lock b,v$sqltext c where a.username is not null and a.lockwait = b.kaddr and c.hash_value =a.sql_hash_value;

3./* 查看oracle隐藏参数 */

select name,
    value,
    decode(isdefault, 'true', 'y', 'n') as "default",
    decode(isem, 'true', 'y', 'n') as sesmod,
    decode(isym, 'immediate', 'i', 'deferred', 'd', 'false', 'n') as sysmod,
    decode(imod, 'modified', 'u', 'sys_modified', 's', 'n') as modified,
    decode(iadj, 'true', 'y', 'n') as adjusted,
    description
 from ( --gv$system_parameter 
    select x.inst_id as instance,
        x.indx + 1,
        ksppinm as name,
        ksppity,
        ksppstvl as value,
        ksppstdf as isdefault,
        decode(bitand(ksppiflg / 256, 1), 1, 'true', 'false') as isem,
        decode(bitand(ksppiflg / 65536, 3),
            1,
            'immediate',
            2,
            'deferred',
            'false') as isym,
        decode(bitand(ksppstvf, 7), 1, 'modified', 'false') as imod,
        decode(bitand(ksppstvf, 2), 2, 'true', 'false') as iadj,
        ksppdesc as description
     from x$ksppi x, x$ksppsv y
     where x.indx = y.indx
      and substr(ksppinm, 1, 1) = '_'
      and x.inst_id = userenv('instance'))
 order by name;

4./* 根据系统中oracle的pid来查看sql */

select /*+ ordered */ sql_text from v$sqltext a where (a.hash_value,a.address) in (select decode (sql_hash_value,0,prev_hash_value,sql_hash_value),decode (sql_hash_value,0,prev_sql_addr,sql_address) from v$session b where b.paddr =( select addr from v$process c where c.spid = '&pid')) order by piece asc;

以上就是本文给大家分享几个比较好用sql语句，希望大家喜欢。