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实用的存储过程之一 (转)

原创 数据库开发技术 作者:worldblog 时间:2007-12-12 15:34:57 0 删除 编辑
实用的存储过程之一 (转)[@more@]

实用的存储过程之一

笔者工作的公司采用的是sqlServer数据库,每天都要处理大量的数据,由于笔者进公司的时间比较晚,公司现有的大部分的程序都是以前的程序员留下的,因为他们没有相关的文档,笔者对于后台数据库的很多表的结构和数据都不甚了解,给日常的维护造成了很大的麻烦。

在对后台数据库进行研究的过程中,我需要得到数据库的某些相关信息,比如,我希望知道各个用户表占用多少磁盘空间,并且排列出来,可以让我知道哪些表比较大,数据比较多等等——我相信,这可能也是不少数据库管理员所关心的问题,所以我决心做一个通用的存储过程。我对系统的存储过程sp_spaceused加了一些改动,以适合我的要求。希望这个存储过程能对大家有些帮助。存储过程如下:

if exists(select name from sysobjects where name='spaceused' and type='p')

Drop procedure spaceused

GO

create procedure spaceused

as

begin

 XML:namespace prefix = o ns = "urn:schemas-microsoft-com:Office:office" />

declare @id  int    -- The object id of @objname.

declare @type  character(2) -- The object type.

declare  @pages  int    -- Working variable for size calc.

declare @dbname sysname

declare @dbsize dec(15,0)

declare @logsize dec(15)

declare @bytesperpage  dec(15,0)

declare @pagesperMB    dec(15,0)

declare @objname nvarchar(776)   -- The object we want size on.

declare @updateusage varchar(5)    -- Param. for specifying that

 

create table #temp1

(

  表名    varchar(200) null,

  行数    char(11) null,

  保留空间   varchar(15) null,

  数据使用空间  varchar(15) null,

  索引使用空间  varchar(15) null,

  未用空间  varchar(15) null

)

--select @objname='N_dep'    -- usage info. should be updated.

select @updateusage='false'

/*Create temp tables before any DML to ensure dynamic

**  We need to create a temp table to do the calculation.

**  reserved: sum(reserved) where indid in (0, 1, 255)

**  data: sum(dpages) where indid < 2 + sum(used) where indid = 255 (text)

**  indexp: sum(used) where indid in (0, 1, 255) - data

**  unused: sum(reserved) - sum(used) where indid in (0, 1, 255)

*/

declare cur_table cursor for

  select name from sysobjects where type='u'

 

Open cur_table

fetch next from cur_table into @objname

 

While @@FETCH_STATUS=0

begin

create table #spt_space

(

  rows  int null,

  reserved  dec(15) null,

  data   dec(15) null,

  indexp  dec(15) null,

  unused  dec(15) null

)

 

/*

**  Check to see if user wants usages updated.

*/

 

if @updateusage is not null

  begin

    select @updateusage=lower(@updateusage)

 

  if @updateusage not in ('true','false')

    begin

      raiserror(15143,-1,-1,@updateusage)

      return(1)

    end

  end

/*

**  Check to see that the objname is local.

*/

if @objname IS NOT NULL

begin

 

  select @dbname = parsename(@objname, 3)

 

  if @dbname is not null and @dbname <> db_name()

    begin

    raiserror(15250,-1,-1)

    return (1)

    end

 

  if @dbname is null

    select @dbname = db_name()

 

  /*

  **  Try to find the object.

  */

  select @id = null

  select @id = id, @type = xtype

    from sysobjects

    where id = object_id(@objname)

 

  /*

  **  Does the object exist?

  */

  if @id is null

    begin

    raiserror(15009,-1,-1,@objname,@dbname)

    return (1)

    end

 

 

  if not exists (select * from sysindexes

    where @id = id and indid < 2)

 

    if  @type in ('P ','D ','R ','TR','C ','RF') --data stored in sysprocedures

    begin

      raiserror(15234,-1,-1)

      return (1)

    end

    else if @type = 'V ' -- View => no physical data storage.

    begin

      raiserror(15235,-1,-1)

      return (1)

    end

    else if @type in ('PK','UQ') -- no physical data storage. --?!?! too many similar messages

    begin

      raiserror(15064,-1,-1)

      return (1)

    end

    else if @type = 'F ' -- FK => no physical data storage.

    begin

      raiserror(15275,-1,-1)

      return (1)

    end

end

 

/*

**  Update usages if user specified to do so.

*/

 

if @updateusage = 'true'

  begin

  if @objname is null

    dbcc updateusage(0) with no_infomsgs

    else

    dbcc updateusage(0,@objname) with no_infomsgs

    print ' '

  end

 

 

set nocount on

 

/*

**  If @id is null, then we want summary data.

*/

/*  Space used calculated in the following way

**  @dbsize = Pages used

**  @bytesperpage = d.low (where d = master.dbo.spt_values) is

**  the # of bytes per page when d.type = 'E' and

**  d.number = 1.

**  Size = @dbsize * d.low / (1048576 (OR 1 MB))

*/

if @id is null

begin

  select @dbsize = sum(convert(dec(15),size))

    from dbo.sysfiles

    where (status & 64 = 0)

 

  select @logsize = sum(convert(dec(15),size))

    from dbo.sysfiles

    where (status & 64 <> 0)

 

  select @bytesperpage = low

    from master.dbo.spt_values

    where number = 1

    and type = 'E'

  select @pagesperMB = 1048576 / @bytesperpage

 

  select  database_name = db_name(),

    database_size =

    ltrim(str((@dbsize + @logsize) / @pagesperMB,15,2) + ' MB'),

    'unallocated space' =

    ltrim(str((@dbsize -

    (select sum(convert(dec(15),reserved))

      from sysindexes

      where indid in (0, 1, 255)

    )) / @pagesperMB,15,2)+ ' MB')

 

  print ' '

  /*

  **  Now calculate the summary data.

  **  reserved: sum(reserved) where indid in (0, 1, 255)

  */

  insert into #spt_space (reserved)

    select sum(convert(dec(15),reserved))

    from sysindexes

    where indid in (0, 1, 255)

 

  /*

  ** data: sum(dpages) where indid < 2

  **  + sum(used) where indid = 255 (text)

  */

  select @pages = sum(convert(dec(15),dpages))

    from sysindexes

    where indid < 2

  select @pages = @pages + isnull(sum(convert(dec(15),used)), 0)

    from sysindexes

    where indid = 255

  update #spt_space

    set data = @pages

 

 

  /* index: sum(used) where indid in (0, 1, 255) - data */

  update #spt_space

    set indexp = (select sum(convert(dec(15),used))

    from sysindexes

      where indid in (0, 1, 255))

      - data

 

  /* unused: sum(reserved) - sum(used) where indid in (0, 1, 255) */

  update #spt_space

    set unused = reserved

    - (select sum(convert(dec(15),used))

      from sysindexes

      where indid in (0, 1, 255))

 

  select reserved = ltrim(str(reserved * d.low / 1024.,15,0) +

    ' ' + 'KB'),

    data = ltrim(str(data * d.low / 1024.,15,0) +

    ' ' + 'KB'),

    index_size = ltrim(str(indexp * d.low / 1024.,15,0) +

    ' ' + 'KB'),

    unused = ltrim(str(unused * d.low / 1024.,15,0) +

    ' ' + 'KB')

    from #spt_space, master.dbo.spt_values d

    where d.number = 1

    and d.type = 'E'

end

 

/*

**  We want a particular object.

*/

else

begin

  /*

  **  Now calculate the summary data.

  **  reserved: sum(reserved) where indid in (0, 1, 255)

  */

  insert into #spt_space (reserved)

    select sum(reserved)

    from sysindexes

    where indid in (0, 1, 255)

      and id = @id

 

  /*

  ** data: sum(dpages) where indid < 2

  **  + sum(used) where indid = 255 (text)

  */

  select @pages = sum(dpages)

    from sysindexes

    where indid < 2

      and id = @id

  select @pages = @pages + isnull(sum(used), 0)

    from sysindexes

    where indid = 255

    and id = @id

  update #spt_space

    set data = @pages

 

 

  /* index: sum(used) where indid in (0, 1, 255) - data */

  update #spt_space

    set indexp = (select sum(used)

    from sysindexes

      where indid in (0, 1, 255)

      and id = @id)

      - data

 

  /* unused: sum(reserved) - sum(used) where indid in (0, 1, 255) */

  update #spt_space

    set unused = reserved

    - (select sum(used)

      from sysindexes

      where indid in (0, 1, 255)

      and id = @id)

  update #spt_space

    set rows = i.rows

    from sysindexes i

    where i.indid < 2

      and i.id = @id

  insert into #temp1

  select name = object_name(@id),

    rows = convert(char(11), rows),

    reserved = ltrim(str(reserved * d.low / 1024.,15,0) +

    ' ' + 'KB'),

    data = ltrim(str(data * d.low / 1024.,15,0) +

    ' ' + 'KB'),

    index_size = ltrim(str(indexp * d.low / 1024.,15,0) +

    ' ' + 'KB'),

    unused = ltrim(str(unused * d.low / 1024.,15,0) +

    ' ' + 'KB')

  from #spt_space, master.dbo.spt_values d

    where d.number = 1

    and d.type = 'E'

Drop table #spt_space

end

fetch next from cur_table into @objname

end

Close cur_table

DEALLOCATE cur_table

Select * from #temp1 order by len(保留空间) desc,保留空间 desc

Drop table #temp1

return (0)

end

原理很简单,相信大家都能看懂,sp_spaceused几乎原封不动地保留下来,调用也很简单,直接执行即可,没有任何参数,存储过程执行后,将把当前连接的数据库中所有数据表按照从大到小排列出来,还有其他的相关信息。如果能对大家有所参考价值,就请大家能给forgot2000一点掌声鼓励吧,谢谢!

本存储过程在SQLServer7.0/2000下通过。

本人qq:33563255,E-Mail:coolforgot@sina.com

 

 


来自 “ ITPUB博客 ” ,链接:http://blog.itpub.net/10752043/viewspace-992228/,如需转载,请注明出处,否则将追究法律责任。

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