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=
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