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oracle哪壹個數據庫視圖能看到當前的session 看到當前的回滾段

Oracle常用視圖

1 Oracle常用數據字典表

1、 查看當前用戶的缺省表空間

SQL>select username,default_tablespace from user_users;

2、 查看當前用戶的角色

SQL>select * from user_role_privs;

3、 查看當前用戶的系統權限和表級權限

SQL>select * from user_sys_privs;

SQL>select * from user_tab_privs;

4、 查看用戶下所有的表

SQL>select * from user_tables;

5、 查看用戶下所有的表的列屬性

SQL>select * from USER_TAB_COLUMNS where table_name=:table_Name;

6、 顯示用戶信息(所屬表空間)

select default_tablespace, temporary_tablespace

from dba_users www.2cto.com

where username = 'GAME';

7、 顯示當前會話所具有的權限

SQL>select * from session_privs;

8、 顯示指定用戶所具有的系統權限

SQL>select * from dba_sys_privs where grantee='GAME';

9、 顯示特權用戶

select * from v$pwfile_users;

10、 顯示用戶信息(所屬表空間)

select default_tablespace,temporary_tablespace

from dba_users where username='GAME';

11、 顯示用戶的PROFILE

select profile from dba_users where username='GAME';

2 表

1、 查看用戶下所有的表

SQL>select * from user_tables;

2、 查看名稱包含log字符的表

SQL>select object_name,object_id from user_objects

where instr(object_name,'LOG')>0;

3、 查看某表的創建時間

SQL>select object_name,created from user_objects where object_name=upper('&table_name');

4、 查看某表的大小

SQL>select sum(bytes)/(1024*1024) as "size(M)" from user_segments

where segment_name=upper('&table_name');

5、 查看放在Oracle的內存區裏的表

SQL>select table_name,cache from user_tables where instr(cache,'Y')>0;

3 索引

1、 查看索引個數和類別

SQL>select index_name,index_type,table_name from user_indexes order by table_name;

2、 查看索引被索引的字段

SQL>select * from user_ind_columns where index_name=upper('&index_name');

3、 查看索引的大小

SQL>select sum(bytes)/(1024*1024) as "size(M)" from user_segments

where segment_name=upper('&index_name');

4 序列號

1、 查看序列號,last_number是當前值

SQL>select * from user_sequences;

5 視圖

1、 查看視圖的名稱

SQL>select view_name from user_views;

2、 查看創建視圖的select語句

SQL>set view_name,text_length from user_views;

SQL>set long 2000; 說明:可以根據視圖的text_length值設定set long 的大小

SQL>select text from user_views where view_name=upper('&view_name');

6 同義詞

1、 查看同義詞的名稱

SQL>select * from user_synonyms;

7 約束條件 www.2cto.com

1、 查看某表的約束條件

SQL>select constraint_name, constraint_type,search_condition, r_constraint_name

from user_constraints where table_name = upper('&table_name');

SQL>select c.constraint_name,c.constraint_type,cc.column_name

from user_constraints c,user_cons_columns cc

where c.owner = upper('&table_owner') and c.table_name = upper('&table_name')

and c.owner = cc.owner and c.constraint_name = cc.constraint_name

order by cc.position;

8 存儲函數和過程

1、 查看函數和過程的狀態

SQL>select object_name,status from user_objects where object_type='FUNCTION';

SQL>select object_name,status from user_objects where object_type='PROCEDURE';

2、 查看函數和過程的源代碼

SQL>select text from all_source where owner=user and name=upper('&plsql_name');

9 常用的數據字典:

dba_data_files:通常用來查詢關於數據庫文件的信息

dba_db_links:包括數據庫中的所有數據庫鏈路,也就是databaselinks。

dba_extents:數據庫中所有分區的信息

dba_free_space:所有表空間中的自由分區

dba_indexs:關於數據庫中所有索引的描述

dba_ind_columns:在所有表及聚集上壓縮索引的列

dba_objects:數據庫中所有的對象

dba_rollback_segs:回滾段的描述

dba_segments:所有數據庫段分段的存儲空間

dba_synonyms:關於同義詞的信息查詢

dba_tables:數據庫中所有數據表的描述

dba_tabespaces:關於表空間的信息

dba_tab_columns:所有表描述、視圖以及聚集的列

dba_tab_grants/privs:對象所授予的權限

dba_ts_quotas:所有用戶表空間限額

dba_users:關於數據的所有用戶的信息

dba_views:數據庫中所有視圖的文本

10 常用的動態性能視圖:

v$datafile:數據庫使用的數據文件信息

v$librarycache:***享池中SQL語句的管理信息

v$lock:通過訪問數據庫會話,設置對象鎖的所有信息

v$log:從控制文件中提取有關重做日誌組的信息

v$logfile有關實例重置日誌組文件名及其位置的信息

v$parameter:初始化參數文件中所有項的值

v$process:當前進程的信息 www.2cto.com

v$rollname:回滾段信息

v$rollstat:聯機回滾段統計信息

v$rowcache:內存中數據字典活動/性能信息

v$session:有關會話的信息

v$sesstat:在v$session中報告當前會話的統計信息

v$sqlarea:***享池中使用當前光標的統計信息,光標是壹塊內存區域,有Oracle處理SQL語句時打開。

v$statname:在v$sesstat中報告各個統計的含義

v$sysstat:基於當前操作會話進行的系統統計

v$waitstat:出現壹個以上會話訪問數據庫的數據時的詳細情況。當有壹個以上的會話訪問同壹信息時,可出現等待情況。

總結了壹下這些,徹底區別了視圖與數據字典,也不那麽容易混淆。嘿嘿!!!

11 常用SQL查詢:

1、查看表空間的名稱及大小

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、查看表空間物理文件的名稱及大小

select tablespace_name, file_id, file_name,

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

from dba_data_files

order by tablespace_name;

3、查看回滾段名稱及大小

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;

www.2cto.com

4、查看控制文件

select name from v$controlfile;

5、查看日誌文件

select member from v$logfile;

6、查看表空間的使用情況

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、查看數據庫庫對象

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

8、查看數據庫的版本

Select version FROM Product_component_version

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

9、查看數據庫的創建日期和歸檔方式

Select Created, Log_Mode, Log_Mode From V$Database;

10、捕捉運行很久的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

12.查看還沒提交的事務

select * from v$locked_object;

select * from v$transaction;

13。查找object為哪些進程所用

select www.2cto.com

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

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

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 www.2cto.com

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

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

18。查看sga情況

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, INVALIDATIONS, PARSE_CALLS, DISK_READS,

BUFFER_GETS, ROWS_PROCESSED FROM V$SQLAREA