oracle空間查詢

表空間使用情況：

select upper(f.tablespace_name) "表空間名",

d.tot_grootte_mb "表空間大小(m)",
d.tot_grootte_mb - f.total_bytes "已使用空間(m)",
to_char(round((d.tot_grootte_mb - f.total_bytes) / d.tot_grootte_mb * 100,2),'990.99') || '%' "使用比",
f.total_bytes "空閒空間(m)",
f.max_bytes "最大塊(m)"
from (select tablespace_name,
round(sum(bytes) / (1024 * 1024), 2) total_bytes,
round(max(bytes) / (1024 * 1024), 2) max_bytes
from sys.dba_free_space
group by tablespace_name) f,
(select dd.tablespace_name,
round(sum(dd.bytes) / (1024 * 1024), 2) tot_grootte_mb
from sys.dba_data_files dd
group by dd.tablespace_name) d
where d.tablespace_name = f.tablespace_name
order by 1;

select tablespace_name,

count(*) as extends,
round(sum(bytes) / 1024 / 1024, 2) as mb,
sum(blocks) as blocks
from dba_free_space
group by tablespace_name;

查詢表空間的總容量：

select tablespace_name, sum(bytes) / 1024 / 1024 as mb

from dba_data_files
group by tablespace_name;

查詢表空間的使用率：

select total.tablespace_name,

round(total.mb, 2) as total_mb,
round(total.mb - free.mb, 2) as used_mb,
round((1 - free.mb / total.mb) * 100, 2) || '%' as used_pct
from (select tablespace_name, sum(bytes) / 1024 / 1024 as mb
from dba_free_space
group by tablespace_name) free,
(select tablespace_name, sum(bytes) / 1024 / 1024 as mb
from dba_data_files
group by tablespace_name) total
where free.tablespace_name = total.tablespace_name;

監控oracle使用者sql運**況：

select osuser, username, sql_text  

from  v$session a, v$sqltext b 
where  a.sql_address =b.address order by address, piece;

select a.sid,spid,status,substr(a.program,1,40) prog, a.terminal,osuser,value/60/100 value 

from  v$session a,v$process b,v$sesstat c 
where  c.statistic#=12 and  
c.sid=a.sid and  
a.paddr=b.addr  
order by value desc;

檢視死鎖資訊：

select (select username

from v$session
where sid = a.sid) blocker, a.sid, 'is blocking',
(select username
from v$session
where sid = b.sid) blockee, b.sid
from v$lock a, v$lock b
where a.block = 1 and b.request > 0 and a.id1 = b.id1 and a.id2 = b.id2;

select s.value,s.sid,a.username

from 
v$sesstat s,v$statname n,v$session a
where 
n.statistic#=s.statistic# and
name='session pga memory'
and s.sid=a.sid
order by s.value;

select hash_value, executions, buffer_gets, disk_reads, parse_calls

from v$sqlarea
where buffer_gets > 10000000 or disk_reads > 1000000
order by buffer_gets + 100 * disk_reads desc;

檢視某條sql語句的資源消耗：

select hash_value, buffer_gets, disk_reads, executions, parse_calls

from v$sqlarea
where hash_value = 228801498 and address = hextoraw('cbd8e4b0');

select   a.sid, a.username, s.sql_text

from v$session a, v$sqltext s
where a.sql_address = s.address
and a.sql_hash_value = s.hash_value
and a.status = 'active'
order by a.username, a.sid, s.piece;

顯示正在等待鎖的所有會話：

select * from dba_waiters;

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