DBA常用SQL查询
(来源:http://www.blogjava.net/pure/archive/2010/08/16/328974.html)
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
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. 查看还没提交的事务
select * from v$locked_object;

select * from v$transaction;



13. 查看object为哪些进程所用
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