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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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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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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$rollstat v
Where r.segment_id = v.usn(+)
order by segment_name ;
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select name from v$controlfile;
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select member from v$logfile;
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select sum(bytes)/(1024*1024) as free_space,tablespace_name
from dba_free_space
group by tablespace_name;
SELECT A.TABLESPACE_NAME,A.BYTES TOTAL,B.BYTES USED, C.BYTES FREE,
(B.BYTES*100)/A.BYTES "% USED",(C.BYTES*100)/A.BYTES "% FREE"
from SYS.SM$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;
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select owner, object_type, status, count(*) count# from all_objects group by owner, object_type, status;
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Select version from Product_component_version
Where SUBSTR(PRODUCT,1,6)='Oracle';
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Select Created, Log_Mode, Log_Mode from V$Database;
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column username format a12
column opname format a16
column progress format a8
select username,sid,opname,
round(sofar*100 / totalwork,0) || '%' as progress,
time_remaining,sql_text
from v$session_longops , v$sql
where time_remaining <> 0
and sql_address = address
and sql_hash_value = hash_value
/
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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_


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select sid,serial#,username,program,machine,status
from v$session; ......

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Ò»Ö±ÒÔΪ  <id name="id" type="integer">
<column name="ID" precision="5" scale="0" />
<generator class="sequence"¡¡/>
</id> ÕâÑù¾Í¿ÉÒÔ×ÔÔöÁË¡£¡£
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SQL> create view v_tt
2 as
3 select ename||' '||deptno as data
4 from emp;
View created.
SQL> select * from v_tt;
DATA
---------------------------------------------------
SMITH 20
ALLEN 30
WARD 30
JONES 20
MARTIN 30
BLAKE 30
CLARK 10
......

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Ö÷Òª·½·¨ÊÇͨ¹ýʹÓÃCASE±í´ïʽÀ´“±ê¼Ç”Ò»¸öÖµÊÇ·ñΪNULL¡£ÕâÀï±ê¼ÇÓÐÁ½¸öÖµ£¬Ò»¸ö±íʾNULL£¬Ò»¸ö±íʾ·ÇNULL¡£ÕâÑù£¬Ö»ÒªÔÚORDER BY×Ó¾äÖÐÔö¼Ó±ê¼ÇÁУ¬±ã¿ÉÒÔºÜÈÝÒ׵ĿØÖÆ¿ÕÖµÊÇÅÅÔÚÇ°Ãæ»¹ÊÇÅÅÔÚºóÃæ£¬¶ø²»»á±»¿ÕÖµËù¸ÉÈÅ¡£
SQL> select ename,sal,comm from emp;
ENAME SAL COMM
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1) DelphiÏòoracleÖд«µÝ²ÎÊý ÈçoracleÖеIJÎÊýÃûΪerpcx 
´ð£ºÈç¹ûÏë´Ó±íÀïȡֵµ½oracle£¬Ôòerpcx:=trim(aq1.fieldbyname('erpcx').AsString);
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with aperp do    
begin
connection:=dm.ADOCerp;      
parameters.Clear;&nbs ......
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