1. /* 得到trace文件路径和名称 */
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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
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2./* 显示产生锁定的sql语句 */
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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$sqltext c where a.username is not null and a.lockwait = b.kaddr and c.hash_value =a.sql_hash_value;
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3./* 查看oracle隐藏参数 */
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select name,
value,
decode(isdefault, 'TRUE', 'Y', 'N') as "Default",
decode(ISEM, 'TRUE', 'Y', 'N') as SesMod,
decode(ISYM, 'IMMEDIATE', 'I', 'DEFERRED', 'D', 'FALSE', 'N') as SysMod,
decode(IMOD, 'MODIFIED', 'U', 'SYS_MODIFIED', 'S', 'N') as Modified,
decode(IADJ, 'TRUE', 'Y', 'N') as Adjusted,
description
from ( --GV$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;
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4./* 根据系统中oracle的pid来查看sql */
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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;
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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。