1、查看表空间的名称及大小

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;

2、查看表空间物理文件的名称及大小

select tablespace_name, file_id, file_name,

round(bytes/(1024*1024),0) total_space

from dba_data_files

order by tablespace_name;

3、查看回滚段名称及大小

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 ;

4、查看控制文件

select name from v$controlfile;

5、查看日志文件

select member from v$logfile;

6、查看表空间的使用情况

select sum(bytes)/(1024*1024) as free_space,tablespace_name

from dba_free_space

group by tablespace_name;

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;

7、查看数据库库对象

select owner, object_type, status, count(*) count# from all_objects group by owner, object_type, status;

8、查看数据库的版本

Select version FROM Product_component_version

Where SUBSTR(PRODUCT,1,6)='Oracle';

9、查看数据库的创建日期和归档方式

Select Created, Log_Mode, Log_Mode From V$Database;

10、捕捉运行很久的SQL

column username format a12

column opname format a16

column progress format a8

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

/

11、查看数据表的参数信息

SELECTpartition_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 = :townerORDER BY partition_position;

12、查看还没提交的事务

select* from v$locked_object;

select* from v$transaction;

13、查找object为哪些进程所用

selectp.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;

14、回滚段查看

selectrownum,

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)

selects.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;

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

SELECTv$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

SELECTNAME, BYTES FROM SYS.V_$SGASTAT ORDER BY NAME ASC19、查看catched object

SELECTowner,

name,

db_link,

namespace,

type,

sharable_mem,

loads,

executions,

locks,

pins,

kept

FROM v$db_object_cache;20、查看V$SQLAREA

SELECTSQL_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;21、查看object分类数量

selectdecode (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# >1group 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(*) from22、按用户查看object种类

selectu.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,

sum(decode(o.type#,1,

NULL,2,

NULL,3,

NULL,4,

NULL,5,

NULL,6,

NULL,1)) others

from sys.obj$ o, sys.user$ u

where o.type# >=1and u.user# = o.owner#

and u.name <>'PUBLIC'group by u.name

order by sys.link$

union

select'CONSTRAINT', count(*) from sys.con$;23、有关connection的相关信息

1)查看有哪些用户连接

selects.osuser os_user_name,

decode(sign(48- command),1,

to_char(command),'Action Code #'|| to_char(command)) action,

p.program oracle_process,

status session_status,

s.terminal terminal,

s.program program,

s.username user_name,

s.fixed_table_sequence activity_meter,''query,0memory,0max_memory,0cpu_usage,

s.sid,

s.serial# serial_num

from v$session s, v$process p

where s.paddr = p.addr

and s.type ='USER'order by s.username, s.osuser;2)根据v.sid查看对应连接的资源占用等情况

selectn.name,

v.value,

n.class,

n.statistic#

fromv$statname n,

v$sesstat v

where v.sid =71and

v.statistic# = n.statistic#

order by n.class, n.statistic#3)根据sid查看对应连接正在运行的sql

select/*+ PUSH_SUBQ */command_type,

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,

sysdate start_time,

sysdate finish_time,'>'|| address sql_address,'N'status

from v$sqlarea

where address = (select sql_address from v$session where sid =71)

24、查询表空间使用情况

selecta.tablespace_name "±í¿Õ¼äÃû³Æ",100- round((nvl(b.bytes_free,0) / a.bytes_alloc) *100,2) "Õ¼ÓÃÂÊ(%)",

round(a.bytes_alloc /1024/1024,2) "ÈÝÁ¿(M)",

round(nvl(b.bytes_free,0) /1024/1024,2) "¿ÕÏÐ(M)",

round((a.bytes_alloc - nvl(b.bytes_free,0)) /1024/1024,2) "ʹÓÃ(M)",

Largest "×î´óÀ©Õ¹¶Î(M)",

to_char(sysdate,'yyyy-mm-dd hh24:mi:ss') "²ÉÑùʱ¼ä"

from (select f.tablespace_name,

sum(f.bytes) bytes_alloc,

sum(decode(f.autoextensible,'YES', f.maxbytes,'NO', f.bytes)) maxbytes

from dba_data_files f

group by tablespace_name) a,

(select f.tablespace_name, sum(f.bytes) bytes_free

from dba_free_space f

group by tablespace_name) b,

(select round(max(ff.length) *16/1024,2) Largest,

ts.name tablespace_name

from sys.fet$ ff, sys.file$ tf, sys.ts$ ts

where ts.ts# = ff.ts#

and ff.file# = tf.relfile#

and ts.ts# = tf.ts#

group by ts.name, tf.blocks) c

where a.tablespace_name = b.tablespace_name

and a.tablespace_name = c.tablespace_name;

25、查询表空间的碎片程度

select tablespace_name,count(tablespace_name) from dba_free_space group by tablespace_name

having count(tablespace_name)>10;

alter tablespace name coalesce;

alter table name deallocate unused;

create or replace view ts_blocks_v as

select tablespace_name,block_id,bytes,blocks,'free space' segment_name from dba_free_space

union all

select tablespace_name,block_id,bytes,blocks,segment_name from dba_extents;

select * from ts_blocks_v;

select tablespace_name,sum(bytes),max(bytes),count(block_id) from dba_free_space

group by tablespace_name;

26、查询有哪些数据库实例在运行

select inst_name fromv$active_instances;