Oracle维护常用SQL语句
action,
p.program oracle_process,
s.terminal terminal,
s.program program,
s.status session_status
from v$session s, v$access a, v$process p
where s.paddr = p.addr and
s.type = ''''USER'''' and
a.sid = s.sid and
a.object=''''SUBSCRIBER_ATTR''''
order by s.username, s.osuser
14、回滚段查看
select rownum, sys.dba_rollback_segs.segment_name Name, v$rollstat.extents
Extents, v$rollstat.rssize Size_in_Bytes, v$rollstat.xacts XActs,
v$rollstat.gets Gets, v$rollstat.waits Waits, v$rollstat.writes Writes,
sys.dba_rollback_segs.status status from v$rollstat, sys.dba_rollback_segs,
v$rollname where v$rollname.name(+) = sys.dba_rollback_segs.segment_name and
v$rollstat.usn (+) = v$rollname.usn order by rownum
15、耗资源的进程（top session）
select s.schemaname schema_name, decode(sign(48 - command), 1,
to_char(command), ''''Action Code #'''' to_char(command) ) action, status
session_status, s.osuser os_user_name, s.sid, p.spid , s.serial# serial_num,
nvl(s.username, ''''[Oracle process]'''') user_name, s.terminal terminal,
s.program program, st.value criteria_value from v$sesstat st, v$session s , v$processp
where st.sid = s.sid and st.statistic# = to_number(''''38'''') and (''''ALL'''' = ''''ALL''''
or s.status = ''''ALL'''') and p.addr = s.paddr order by st.value desc, p.spid asc, s.username asc, s.osuser asc
16、查看锁（lock）情况
select /*+ RULE */ ls.osuser os_user_name, ls.username user_name,
decode(ls.type, ''''RW'''', ''''Row wait enqueue lock'''', ''''TM'''', ''''DML enqueue lock'''', ''''TX'''',
''''Transaction enqueue lock'''', ''''UL'''', ''''User supplied lock'''') lock_type,
o.object_name object, decode(ls.lmode, 1, null, 2, ''''Row Share'''', 3,
''''Row Exclusive'''', 4, ''''Share'''', 5, ''''Share Row Exclusive'''', 6, ''''Exclusive'''', null)
lock_mode, o.owner, ls.sid, ls.serial# serial_num, ls.id1, ls.id2
from sys.dba_objects o, ( select s.osuser, s.username, l.type,
l.lmode, s.sid, s.serial#, l.id1, l.id2 from v$session s,
v$lock l where s.sid = l.sid ) ls where o.object_id = ls.id1 and o.owner
<> ''''SYS'''' order by o.owner, o.object_name
17、查看等待（wait）情况
SELECT v$waitstat.class, v$waitstat.count count, SUM(v$sysstat.value) sum_value
FROM v$waitstat, v$sysstat WHERE v$sysstat.name IN (''''db block gets'''',
''''consistent gets'''') group by v$waitstat.class, v$waitstat.count
18、查看sga情况
SELECT NAME, BYTES FROM SYS.V_$SGASTAT ORDER BY NAME ASC
19、查看catched object
SELECT owner, name, db_link, namespace,
type, sharable_mem, loads, executions,
locks, pins, kept FROM v$db_object_cache
20、查看V$SQLAREA
SELECT SQL_TEXT, SHARABLE_MEM, PERSISTENT_MEM, RUNTIME_MEM, SORTS,
VERSION_COUNT, LOADED_VERSIONS, OPEN_VERSIONS, USERS_OPENING, EXECUTIONS,
USERS_EXECUTING, LOADS, FIRST_LOAD_TIME, INVALIDATION
p.program oracle_process,
s.terminal terminal,
s.program program,
s.status session_status
from v$session s, v$access a, v$process p
where s.paddr = p.addr and
s.type = ''''USER'''' and
a.sid = s.sid and
a.object=''''SUBSCRIBER_ATTR''''
order by s.username, s.osuser
14、回滚段查看
select rownum, sys.dba_rollback_segs.segment_name Name, v$rollstat.extents
Extents, v$rollstat.rssize Size_in_Bytes, v$rollstat.xacts XActs,
v$rollstat.gets Gets, v$rollstat.waits Waits, v$rollstat.writes Writes,
sys.dba_rollback_segs.status status from v$rollstat, sys.dba_rollback_segs,
v$rollname where v$rollname.name(+) = sys.dba_rollback_segs.segment_name and
v$rollstat.usn (+) = v$rollname.usn order by rownum
15、耗资源的进程（top session）
select s.schemaname schema_name, decode(sign(48 - command), 1,
to_char(command), ''''Action Code #'''' to_char(command) ) action, status
session_status, s.osuser os_user_name, s.sid, p.spid , s.serial# serial_num,
nvl(s.username, ''''[Oracle process]'''') user_name, s.terminal terminal,
s.program program, st.value criteria_value from v$sesstat st, v$session s , v$processp
where st.sid = s.sid and st.statistic# = to_number(''''38'''') and (''''ALL'''' = ''''ALL''''
or s.status = ''''ALL'''') and p.addr = s.paddr order by st.value desc, p.spid asc, s.username asc, s.osuser asc
16、查看锁（lock）情况
select /*+ RULE */ ls.osuser os_user_name, ls.username user_name,
decode(ls.type, ''''RW'''', ''''Row wait enqueue lock'''', ''''TM'''', ''''DML enqueue lock'''', ''''TX'''',
''''Transaction enqueue lock'''', ''''UL'''', ''''User supplied lock'''') lock_type,
o.object_name object, decode(ls.lmode, 1, null, 2, ''''Row Share'''', 3,
''''Row Exclusive'''', 4, ''''Share'''', 5, ''''Share Row Exclusive'''', 6, ''''Exclusive'''', null)
lock_mode, o.owner, ls.sid, ls.serial# serial_num, ls.id1, ls.id2
from sys.dba_objects o, ( select s.osuser, s.username, l.type,
l.lmode, s.sid, s.serial#, l.id1, l.id2 from v$session s,
v$lock l where s.sid = l.sid ) ls where o.object_id = ls.id1 and o.owner
<> ''''SYS'''' order by o.owner, o.object_name
17、查看等待（wait）情况
SELECT v$waitstat.class, v$waitstat.count count, SUM(v$sysstat.value) sum_value
FROM v$waitstat, v$sysstat WHERE v$sysstat.name IN (''''db block gets'''',
''''consistent gets'''') group by v$waitstat.class, v$waitstat.count
18、查看sga情况
SELECT NAME, BYTES FROM SYS.V_$SGASTAT ORDER BY NAME ASC
19、查看catched object
SELECT owner, name, db_link, namespace,
type, sharable_mem, loads, executions,
locks, pins, kept FROM v$db_object_cache
20、查看V$SQLAREA
SELECT SQL_TEXT, SHARABLE_MEM, PERSISTENT_MEM, RUNTIME_MEM, SORTS,
VERSION_COUNT, LOADED_VERSIONS, OPEN_VERSIONS, USERS_OPENING, EXECUTIONS,
USERS_EXECUTING, LOADS, FIRST_LOAD_TIME, INVALIDATION