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。