sp_spaceused values

Hi I run sp_spaceused and following result display in qa

db name=rtc
db size= 900.00MB
unallocated space = -200.86MB why it has negative value over here??
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Raynard7Connect With a Mentor Commented:

This seems to occur with reasonable regularity whenever large transactions are used.

sp_spaceused uses sysindexes.dpages, which in turn gets out of whack over time as the result of various activities, such as database shrinks, large-scale insert / update / delete activity, truncations etc. To correct this, simply run DBCC UPDATEUSAGE (0) but beware - this is a heavy hitting statement that can hurt a busy server, so I suggest you schedule it to run during a period of low utilisation. DBCC UPDATEUSAGE can be used to update sysindexes for all indexes, or those of a specific table (details in BOL).

from http://www.stillhq.com/sqldownunder/archives/msg02087.html
Aneesh RetnakaranDatabase AdministratorCommented:
Hi motioneye,

i agree with Raynard, this is because of the bulk activities. To correct this you can use DBCC UPDATEUSAGE as mentioned above or use    

sp_spaceused @updateusage = 'TRUE'

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