1、查看表空間的名稱及大小
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select t.tablespace_name, round(sum(bytes/(1024*1024)),0) ts_size
from dba_tablespaces t, dba_data_files d
where t.tablespace_name = d.tablespace_name
group by t.tablespace_name;
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2、查看表空間物理文件的名稱及大小
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select tablespace_name, file_id, file_name,
round(bytes/(1024*1024),0) total_space
from dba_data_files
order by tablespace_name;
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3、查看回滾段名稱及大小
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select segment_name, tablespace_name, r.status,
(initial_extent/1024) InitialExtent,(next_extent/1024) NextExtent,
max_extents, v.curext CurExtent
From dba_rollback_segs r, v$rollstat v
Where r.segment_id = v.usn(+)
order by segment_name;
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4、查看控制文件
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select name from v$controlfile;
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5、查看日志文件
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select member from v$logfile;
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6、查看表空間的使用情況
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select sum(bytes)/(1024*1024) as free_space,tablespace_name
from dba_free_space
group by tablespace_name;
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SELECT A.TABLESPACE_NAME,A.BYTES TOTAL,B.BYTES USED, C.BYTES FREE,
(B.BYTES*100)/A.BYTES "% USED",(C.BYTES*100)/A.BYTES "% FREE"
FROM SYS.SM$TS_AVAIL A,SYS.SM$TS_USED B,SYS.SM$TS_FREE C
WHERE A.TABLESPACE_NAME=B.TABLESPACE_NAME AND A.TABLESPACE_NAME=C.TABLESPACE_NAME;
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7、查看數據庫庫對象
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select owner, object_type, status, count(*) count# from all_objects group by owner, object_type, status;
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8、查看數據庫的版本
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Select version FROM Product_component_version
Where SUBSTR(PRODUCT,1,6)='Oracle';
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9、查看數據庫的創建日期和歸檔方式
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Select Created, Log_Mode, Log_Mode From V$Database;
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10、捕捉運行很久的SQL
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column username format a12
column opname format a16
column progress format a8
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select username,sid,opname,
????? round(sofar*100 / totalwork,0) || '%' as progress,
????? time_remaining,sql_text
from v$session_longops , v$sql
where time_remaining <> 0
and sql_address = address
and sql_hash_value = hash_value
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11。查看數據表的參數信息
SELECT?? partition_name, high_value, high_value_length, tablespace_name,
??????? pct_free, pct_used, ini_trans, max_trans, initial_extent,
??????? next_extent, min_extent, max_extent, pct_increase, FREELISTS,
??????? freelist_groups, LOGGING, BUFFER_POOL, num_rows, blocks,
??????? empty_blocks, avg_space, chain_cnt, avg_row_len, sample_size,
??????? last_analyzed
?? FROM dba_tab_partitions
? --WHERE table_name = :tname AND table_owner = :towner
ORDER BY partition_position
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12.查看還沒提交的事務
select * from v$locked_object;
select * from v$transaction;
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13。查找object為哪些進程所用
select
p.spid,
s.sid,
s.serial# serial_num,
s.username user_name,
a.type? object_type,
s.osuser os_user_name,
a.owner,
a.object object_name,
decode(sign(48 - command),
1,
to_char(command), 'Action Code #' || to_char(command) ) action,
p.program oracle_process,
s.terminal terminal,
s.program program,
s.status session_status??
from v$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
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14。回滾段查看
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$rollname.usn order by rownum
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15。耗資源的進程（top session）
select s.schemaname schema_name,??? decode(sign(48 - command), 1,
to_char(command), 'Action Code #' || to_char(command) ) action,??? status
session_status,?? s.osuser os_user_name,?? s.sid,???????? p.spid ,???????? s.serial# serial_num,??
nvl(s.username, '[Oracle process]') user_name,?? s.terminal terminal,???
s.program program,?? st.value criteria_value? from v$sesstat st,?? v$session s? , v$process p??
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
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16。查看鎖（lock）情況
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
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17。查看等待（wait）情況
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
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18。查看sga情況
SELECT NAME, BYTES FROM SYS.V_$SGASTAT ORDER BY NAME ASC
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19。查看catched object
SELECT owner,????????????? name,????????????? db_link,????????????? namespace,?
?????????? type,????????????? sharable_mem,????????????? loads,????????????? executions,??
????????? locks,????????????? pins,????????????? kept??????? FROM v$db_object_cache
?????????
20。查看V$SQLAREA
SELECT SQL_TEXT, SHARABLE_MEM, PERSISTENT_MEM, RUNTIME_MEM, SORTS,
VERSION_COUNT, LOADED_VERSIONS, OPEN_VERSIONS, USERS_OPENING, EXECUTIONS,
USERS_EXECUTING, LOADS, FIRST_LOAD_TIME, INVALIDATIONS, PARSE_CALLS, DISK_READS,
BUFFER_GETS, ROWS_PROCESSED FROM V$SQLAREA
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21。查看object分類數量
select decode (o.type#,1,'INDEX' , 2,'TABLE' , 3 , 'CLUSTER' , 4, 'VIEW' , 5 ,
'SYNONYM' , 6 , 'SEQUENCE' , 'OTHER' ) object_type , count(*) quantity from
sys.obj$ o where o.type# > 1 group by decode (o.type#,1,'INDEX' , 2,'TABLE' , 3
, 'CLUSTER' , 4, 'VIEW' , 5 , 'SYNONYM' , 6 , 'SEQUENCE' , 'OTHER' ) union select
'COLUMN' , count(*) from sys.col$ union select 'DB LINK' , count(*) from
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22。按用戶查看object種類
select u.name schema,?? sum(decode(o.type#, 1, 1, NULL)) indexes,??
sum(decode(o.type#, 2, 1, NULL)) tables,?? sum(decode(o.type#, 3, 1, NULL))
clusters,?? sum(decode(o.type#, 4, 1, NULL)) views,?? sum(decode(o.type#, 5, 1,
NULL)) synonyms,?? sum(decode(o.type#, 6, 1, NULL)) sequences,?%2