-- Author: <vagerent>
-- Create date: <2006-12-14>
-- Description: <获取编码,形如HEAD20060512000001;(头+日期+6位整数)后面为六位,每新的一年编号重新
归0>
-- =============================================
Create PROCEDURE [dbo].[mp_GetPKNo]
@sTableName varchar(50),
@sFieldName varchar(50),--目标字段
@sHead varchar(50),--前缀,如Head等
@sPK varchar(50) out --输出
AS
BEGIN
declare @dToday datetime,@sToday varchar(10),
@sYear varchar(10),@sSubID varchar(20),@sSql nvarchar(1000);--动态sql一定要用
nvarchar!!!
set @dToday = getdate();
set @sToday = Convert(varchar,Year(@dToday))
+SubString(Convert(varchar,Month(@dToday)+100),2,2)
+SubString(Convert(varchar,Day(@dToday)+100),2,2);
--select @sToday--形如20060512
set @sYear=Convert(varchar(10),Year(getdate()))
--select @sYear--形如2006
declare @sHead1 varchar(30),@iHeadLength int;
set @sHead1=@sHead+@sYear;--形如HEAD2006
--select @sHead1;--形如HEAD2006
set @iHeadLength=Len(@sHead1);
--select @iHeadLength;--形如6
set @sSql = N'select @sSubID=Max(SubString('
+@sFieldName+','+Convert(varchar(10),@iHeadLength+5)+',6)) from '
+@sTableName+' where SubString('+@sFieldName+',1,'
+Convert(varchar(10),@iHeadLength)+')='''+@sHead1+'''';
--select @sSql;--形如select..
exec sp_executesql @sSql,N'@sSubID varchar(20) output',@sSubID output;
if ((@sSubID='') or (@sSubID is null))
set @sSubID='000001'
else
begin
declare @iSubID int;
set @iSubID=Convert(int,@sSubID)+1000001;
set @sSubID=SubString(Convert(varchar,@iSubID),2,6)
end
--select @sSubID;
set @sPK=@sHead+@sToday+@sSubID;
return
END
--Demo 1:
use northwind
go
set statistics IO on
go
select count(*) from northwind.dbo.employees
go
set statistics IO off
go
use northwind
go
exec sp_spaceused employees
go
--Demo 2:
set statistics time on
go
select count(*) from northwind.dbo.employees
go
set statistics time off
go
--Demo 3:
set showplan_text on
go
select count(*) from northwind.dbo.employees
go
set showplan_text off
go
--Demo 4:
set nocount on
go
select count(*) from northwind.dbo.employees
go
set nocount off
go
--Demo 5查询单条sql语句的执行时间:
declare @start_time datetime
select @start_time=getdate()
select * from northwind.dbo.employees
select '查询语句的执行时间(毫秒)'=datediff(ms,@start_time,getdate())
--Demo 6查询成批的sql语句的执行时间:
create table #save_time(start_time datetime not null)
insert #save_time values(getdate())
go
select * from employees
go
select * from orders
go
select '查询语句的执行时间(毫秒)'=datediff(ms,start_time,getdate())
from #save_time
drop table #save_time
go
--Demo 7返回语句的执行计划内容:
set showplan_all on
go
select * from pubs.dbo.authors
go
set showplan_all off
go
--Demo 8从执行计划判断是否需要优化SQL:
/**//*SEEK操作*/
set showplan_all on
go
select * from pubs.dbo.sales where stor_id>='7131'
go
set showplan_all off
go
/**//*SCAN操作*/
set showplan_all on
go
select * from pubs.dbo.sales where ord_date is not null
go
set showplan_all off
go
--Demo 9连接查询VS子查询:
/**//*子查询*/
set statistics io on
go
select au_fname,au_lname from pubs.dbo.authors where au_id in
(select au_id from pubs.dbo.titleauthor)
set statistics io off
go
/**//*连接查询*/
set statistics io on
go
select distinct au_fname,au_lname from pubs.dbo.authors as a inner join
pubs.dbo.titleauthor as t on a.au_id=t.au_id
go
set statistics io off
go
--Demo 10智能优化:
select p1.productname from northwind.dbo.products as p1 inner join
northwind.dbo.products as p2 on (p1.unitprice=p2.unitprice)
where p2.productname like 'Alice%'
1
. 查看数据库的版本select @@version
常见的几种SQL SERVER打补丁后的版本号:
8.00.194 Microsoft SQL Server 2000
8.00.384 Microsoft SQL Server 2000 SP1
8.00.532 Microsoft SQL Server 2000 SP2
8.00.760 Microsoft SQL Server 2000 SP3
8.00.818 Microsoft SQL Server 2000 SP3 w/ Cumulative Patch MS03-031
8.00.2039 Microsoft SQL Server 2000 SP4
2. 查看数据库所在机器操作系统参数
exec master..xp_msver
3. 查看数据库启动的参数
sp_configure
4. 查看数据库启动时间
select convert(varchar(30),login_time,120) from master..sysprocesses where spid=1
查看数据库服务器名和实例名
print 'Server Name: ' + convert(varchar(30),@@SERVERNAME)
print 'Instance: ' + convert(varchar(30),@@SERVICENAME)
5. 查看所有数据库名称及大小
sp_helpdb
重命名数据库用的SQL
sp_renamedb 'old_dbname', 'new_dbname'
6. 查看所有数据库用户登录信息
sp_helplogins
查看所有数据库用户所属的角色信息
sp_helpsrvrolemember
修复迁移服务器时孤立用户时,可以用的fix_orphan_user脚本或者LoneUser过程
更改某个数据对象的用户属主
sp_changeobjectowner [@objectname =] 'object', [@newowner =] 'owner'
注意: 更改对象名的任一部分都可能破坏脚本和存储过程。
把一台服务器上的数据库用户登录信息备份出来可以用add_login_to_aserver脚本
查看某数据库下,对象级用户权限
sp_helprotect
7. 查看链接服务器
sp_helplinkedsrvlogin
查看远端数据库用户登录信息
sp_helpremotelogin
8.查看某数据库下某个数据对象的大小
sp_spaceused @objname
还可以用sp_toptables过程看最大的N(默认为50)个表
查看某数据库下某个数据对象的索引信息
sp_helpindex @objname
还可以用SP_NChelpindex过程查看更详细的索引情况
SP_NChelpindex @objname
clustered索引是把记录按物理顺序排列的,索引占的空间比较少。
对键值DML操作十分频繁的表我建议用非clust