好用的sql语句合集

　　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.statisti = 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;