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常用的 sql 语句具体有哪些,相信很多没有经验的人对此束手无策,为此本文总结了问题出现的原因和解决方法,通过这篇文章希望你能解决这个问题。
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;
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