SQL Server效能常用語句

檢視各表的資料行數

select

o.name, i. rows
from sysobjects o, sysindexes i
where o.id = i.id  and o.xtype = '
u' and i.indid < 2
order by o.name;

--select *from employees as e;

create table #tablespaceinfo
(nameinfo varchar(
50) ,
rowsinfo bigint ,
reserved varchar(
20) ,
datainfo varchar(
20) ,
index_size varchar(
20) ,
unused varchar(20)
)  declare @tablename varchar(
255);  
declare info_cursor cursor
for    select  '[
' + [name] + ']'
from    sys.tables
where   type = 'u'
;   
open info_cursor  
fetch next from info_cursor into @tablename  
while @@fetch_status = 0
begin 
insert  into #tablespaceinfo
exec sp_spaceused @tablename  
fetch next from info_cursor  
into @tablename  
end 
close info_cursor  
deallocate info_cursor  
--建立臨時表
create table [#tmptb]
(tablename varchar(
50) ,
datainfo bigint ,
rowsinfo bigint ,
spaceperrow  as ( case rowsinfo
when 
0 then 0
else cast(datainfo as 
decimal(18,2))/cast(rowsinfo as decimal(18,2
))                       end ) persisted
)--插入資料到臨時表
insert  into [#tmptb]
( [tablename] ,
[datainfo] ,
[rowsinfo]
)select  [nameinfo] ,
cast(replace([datainfo], 'kb
', '') as bigint) as '
datainfo',
[rowsinfo]
from    #tablespaceinfo
order by cast(replace(reserved, 'kb
', ''
) as int) desc  
--彙總記錄
select  [tbspinfo].*,
[tmptb].[spaceperrow] as 
'每行記錄大概占用空間（kb）
'from    [#tablespaceinfo] as tbspinfo ,
[#tmptb] as tmptb
where   [tbspinfo].[nameinfo] =[tmptb].[tablename]
order by cast(replace([tbspinfo].[reserved], 'kb
', ''
) as int) desc  
drop table [#tablespaceinfo]
drop table [#tmptb]

declare

@adatetime
declare
@bdatetime
select@a=
getdate
()exec sp_tables;        --
檢視表select@b=
				
sqlserver常用語句
刪除主鍵 alter table 表名 drop constraint 主鍵名 新增主鍵 alter table 表名 add constraint 主鍵名 primary key 欄位名1,欄位名2 新增非聚集索引的主鍵 alter table 表名 add constraint 主鍵名 prim...
				
SQLSERVER常用語句
dbcc cleantable db name table name alter table drop column語句刪除可變長度列或text dbcc dbreindex 重建指定資料庫的乙個或多個索引 dbcc indexdefrag 對錶或檢視上的索引和非聚集索引進行碎片整理 dbcc pi...
				
SQL Server 常用語句合集
1 對資料進行排序 select row number over order by a.articleid desc as rn row number 計算一行在結果集中的行號，可以當作是唯一的排名。rank over order by a.typeid desc rank 和dense rank ...