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Sybase:如何直接查询段的空间?

王朝other·作者佚名  2006-12-16
窄屏简体版  字體: |||超大  

问:使用sp_helpsegment可以看到段的空间使用情况,但是显示结果中还有段上的所有表和索引信息,对于一个建有很多表的段来说,这是很恐怖的。想直接看到所关心的段的空间使用情况,请高手指点一下。

答:用以下sp_helpsegment的脚本看看

/*Author Hobbylu*/

/*Reference from sybase procedures*/

/*2005-07-01*/

create procedure sp_helpsegment_me

@segname varchar(30) = NULL /* segment name */

as

declare @segbit int, /* this is the bit version of the segment # */

@segment int, /* the segment number of the segment */

@free_pages int, /* unused pages in segment */

@factor float, /* conversion factor to convert to MB */

@clr_pages int, /* Space reserved for CLRs */

@total_pages int, /* total allocatable log space */

@used_pages int, /* allocated log space */

@ismixedlog int /* mixed log & data database ? */

if @@trancount = 0

begin

set chained off

end

set transaction isolation level 1

set nocount on

/*

** If no segment name given, get 'em all.

*/

if @segname is null

begin

--Adaptive Server has expanded all '*' elements in the following statement

select syssegments.segment, syssegments.name, syssegments.status

from syssegments order by segment

return (0)

end

/*

** Make sure the segment exists

*/

if not exists (select *

from syssegments

where name = @segname)

begin

/* 17520, "There is no such segment as '%1!'." */

raiserror 17520, @segname

return (1)

end

/*

** Show the syssegment entry, then the fragments and size it is on,

** then any dependent objects in the database.

*/

--Adaptive Server has expanded all '*' elements in the following statement

select syssegments.segment, syssegments.name, syssegments.status

from syssegments

where name = @segname

/*

** Set the bit position for the segment.

*/

select @segment = segment

from syssegments

where name = @segname

/*

** Now set the segments on @devname sysusages.

*/

if (@segment < 31)

select @segbit = power(2, @segment)

else

/*

** Since this is segment 31, power(2, 31) will overflow

** since segmap is an int. We'll grab the machine-dependent

** bit mask from spt_values to set the right bit.

*/

select @segbit = low

from master.dbo.spt_values

where type = "E"

and number = 2

/*

** Get factor for conversion of pages to megabytes from spt_values

*/

select @factor = convert(float, low) / 1048576.0

from master.dbo.spt_values

where number = 1 and type = "E"

select @total_pages = sum(u.size)

from master.dbo.sysusages u

where u.segmap & @segbit = @segbit

and u.dbid = db_id()

select @ismixedlog = status2 & 32768

from master.dbo.sysdatabases where dbid = db_id()

/*

** Select the sizes of the segments

*/

if (@segbit = 4)

begin

select device = d.name,

size = convert(varchar(20), round((sum(u.size) * @factor), 0)) + "MB"

from master.dbo.sysusages u, master.dbo.sysdevices d

where u.segmap & @segbit = @segbit

and u.dbid = db_id()

and d.status & 2 = 2

and u.vstart between d.low and d.high

group by d.name order by d.name

select @clr_pages = lct_admin("reserved_for_rollbacks", db_id())

select @free_pages = lct_admin("logsegment_freepages", db_id())

- @clr_pages

select free_pages = @free_pages

if(@ismixedlog = 32768)

begin

/*

** For a mixed log and data database, we cannot

** deduce the log used space from the total space

** as it is mixed with data. So we take the expensive

** way by scanning syslogs.

*/

select @used_pages = lct_admin("num_logpages", db_id())

/* Account allocation pages as used pages */

select @used_pages = @used_pages + (@total_pages / 256)

end

else

begin

/* Dedicated log database */

select @used_pages = @total_pages - @free_pages

- @clr_pages

end

end

else

begin

select device = d.name,

size = convert(varchar(20), round((sum(u.size) * @factor), 0)) + "MB",

free_pages = sum(curunreservedpgs(db_id(), u.lstart, u.unreservedpgs))

from master.dbo.sysusages u, master.dbo.sysdevices d

where u.segmap & @segbit = @segbit

and u.dbid = db_id()

and d.status & 2 = 2

and u.vstart between d.low and d.high

group by d.name order by d.name

select @free_pages = sum(curunreservedpgs(db_id(), u.lstart, u.unreservedpgs))

from master.dbo.sysusages u

where u.segmap & @segbit = @segbit

and u.dbid = db_id()

select @used_pages = @total_pages - @free_pages

select @clr_pages = 0

end

/*

** Select the dependent objects

*/

/*

** Print total_size, total_pages, free_pages, used_pages and reserved_pages

*/

select total_size = convert(varchar(15),

round(@total_pages * @factor, 0)) + "MB",

total_pages = convert(char(15), @total_pages),

free_pages = convert(char(15), @free_pages),

used_pages = convert(char(15), @used_pages),

reserved_pages = convert(char(15), @clr_pages)

return (0)

 
 
 
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