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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;
2¡¢²é¿´±í¿Õ¼äÎïÀíÎļþµÄÃû³Æ¼°´óС
select tablespace_name, file_id, file_name,
round(bytes/(1024*1024),0) total_space
from dba_data_files
order by tablespace_name;
3¡¢²é¿´»Ø¹ö¶ÎÃû³Æ¼°´óС
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$rollstat v
Where r.segment_id = v.usn(+)
order by segment_name;
4¡¢²é¿´¿ØÖÆÎļþ
select name from v$controlfile;
5¡¢²é¿´ÈÕÖ¾Îļþ
select member from v$logfile;
6¡¢²é¿´±í¿Õ¼äµÄʹÓÃÇé¿ö
select sum(bytes)/(1024*1024) as free_space,tablespace_name
from dba_free_space
group by tablespace_name;
SELECT A.TABLESPACE_NAME,A.BYTES TOTAL,B.BYTES USED, C.BYTES FREE,
(B.BYTES*100)/A.BYTES "% USED",(C.BYTES*100)/A.BYTES "% FREE"
from SYS.SM$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¡¢²é¿´Êý¾Ý¿â¿â¶ÔÏó
select owner, object_type, status, count(*) count# from all_objects group by owner, object_type, status;
8¡¢²é¿´Êý¾Ý¿âµÄ°æ±¾¡¡
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


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sql 2005 ´æ´¢¹ý³Ì·ÖÒ³ java ´úÂë

 create PROCEDURE pagelist
@tablename nvarchar(50),
@fieldname nvarchar(50)='*',         
@pagesize int output,--ÿҳÏÔʾ¼Ç¼ÌõÊý
@currentpage int output,--µÚ¼¸Ò³
@orderid nvarchar(50),--Ö÷¼üÅÅÐò
@sort int,--ÅÅÐò·½Ê½£¬1±íʾÉýÐò£¬0±íʾ½µÐòÅÅÁÐ ......

Interbase/FirebirdµÄSQLÓï·¨(ÊÕ²Ø)

×î½üÔÚȺÀï´ó¼ÒͻȻÌÖÂÛÏÂfb(firebird)À´ÁË£¬ºÇ£¬¿´ÁËһЩ×ÊÁÏ£¬Í»È»·¢¾õÕâ¸ö¶«Î÷Ò²ÂùºÃÍæµÄ£¬ÓÚÊÇ¿ªÊ¼´óÁ¿µÄ²éÕÒÓйصÄ×ÊÁÏ£¬ÏÂÃæÊÇÒ»
ЩfbϵÄsqlд·¨£¬×ª×ÔÍøÉÏ£¬¸÷λÅóÓѽ«¾ÍЩ¿´¿´°É£¬¹ý¼¸ÌìżÕûÀíºÃ.netÏÂʹÓÃfbµÄdemoÉÏÀ´¸ø´ó¼Ò¿´¿´°É£¬µ½Ê±Ö§³ÖÖ§³Ö°É£¬ºÇºÇ
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  SELECT FIRST
10 templa ......

oracle·þÎñÆ÷ÅäÖü°ÓÅ»¯

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¡¡¡¡½«SGA·Åµ½ÄÚ´æÖÐ﹐ÔÚINIT.ORAÖÐÉèÖòÎÊý PRE_PAGE_SGA
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¡¡¡¡PRE_PAGE_SGA=YES
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¡¡¡¡SELECT¡ ......

sql serverÎÞ·¨Á¬½Ó issue

http://blog.csdn.net/java2000_net/archive/2008/04/05/2252640.aspx
http://sqlserver.chinahtml.com/2006/SQL-mssql11432786154012.shtml
http://www.cnblogs.com/garnai/archive/2007/09/19/898221.html
http://tech.ccidnet.com/art/1099/20050223/214511_1.html
http://www.wangchao.net.cn/bbsdetail_43009.html ......

Ôõô°Ñ sqlÓï¾ä²éѯµÄÖµ¸³¸ø±äÁ¿

string str = System.Configuration.ConfigurationManager.AppSettings["strconn"];
string sqlpwd = "select password from bg_user where username='" + username + "'";
MySqlConnection conn = new MySqlConnection(str);
MySqlCommand cmd=new MySqlCommand(sqlpwd,conn);
MySqlDataAdapter adr = new MySqlDataA ......
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