Space used size decreased

Question

hi
we got our DB's on SQL server2012 entriprise edition,recently i have ran rebuild index maintenance plan for a DB which is around 350GB as this was taking loads of time and consuming lots of disk space i have killed the process in the middle.As this 
plan was taking loads of time to roll back i have restarted the services and then DB went to INRECOVERY and has taken much time to come back to normal online mode. when i have checked the log after recovery it was showing DB has been recovered with 1 transaction
roll back and iam assuming that is rebuild. After this i have shrinked both LDF and MDF and everthing working fine,But i can see decrease in the SPACEUSED in MDF by 12GB could please some one help me to know the reason for this sudden decrease.
with regards,
Ram

Answer 1

hi
If iam not wrong shrinking MDF  will release it's existing free space to hard disk right,how come the space used for MDF file decreased.
for reference i was using below query to calculate the growth of DB by seeing space used
if exists (select * from tempdb.sys.all_objects where name like '%#dbsize%')
drop table #dbsize
create table #dbsize
(Dbname sysname,dbstatus varchar(50),Recovery_Model varchar(40) default ('NA'), file_Size_MB decimal(30,2)default (0),Space_Used_MB decimal(30,2)default (0),Free_Space_MB decimal(30,2) default (0))
go
insert into #dbsize(Dbname,dbstatus,Recovery_Model,file_Size_MB,Space_Used_MB,Free_Space_MB)
exec sp_msforeachdb
'use [?];
  select DB_NAME() AS DbName,
    CONVERT(varchar(20),DatabasePropertyEx(''?'',''Status'')) ,  
    CONVERT(varchar(20),DatabasePropertyEx(''?'',''Recovery'')),  
sum(size)/128.0 AS File_Size_MB,
sum(CAST(FILEPROPERTY(name, ''SpaceUsed'') AS INT))/128.0 as Space_Used_MB,
SUM( size)/128.0 - sum(CAST(FILEPROPERTY(name,''SpaceUsed'') AS INT))/128.0 AS Free_Space_MB  
from sys.database_files  where type=0 group by type'
go
-------------------log size--------------------------------------
  if exists (select * from tempdb.sys.all_objects where name like '#logsize%')
drop table #logsize
create table #logsize
(Dbname sysname, Log_File_Size_MB decimal(38,2)default (0),log_Space_Used_MB decimal(30,2)default (0),log_Free_Space_MB decimal(30,2)default (0))
go
insert into #logsize(Dbname,Log_File_Size_MB,log_Space_Used_MB,log_Free_Space_MB)
exec sp_msforeachdb
'use [?];
  select DB_NAME() AS DbName,
sum(size)/128.0 AS Log_File_Size_MB,
sum(CAST(FILEPROPERTY(name, ''SpaceUsed'') AS INT))/128.0 as log_Space_Used_MB,
SUM( size)/128.0 - sum(CAST(FILEPROPERTY(name,''SpaceUsed'') AS INT))/128.0 AS log_Free_Space_MB  
from sys.database_files  where type=1 group by type'
go
--------------------------------database free size
  if exists (select * from tempdb.sys.all_objects where name like '%#dbfreesize%')
drop table #dbfreesize
create table #dbfreesize
(name sysname,
database_size varchar(50),
Freespace varchar(50)default (0.00))
insert into #dbfreesize(name,database_size,Freespace)
exec sp_msforeachdb
'use [?];SELECT database_name = db_name()
    ,database_size = ltrim(str((convert(DECIMAL(15, 2), dbsize) + convert(DECIMAL(15, 2), logsize)) * 8192 / 1048576, 15, 2) + ''MB'')
    ,''unallocated space'' = ltrim(str((
                CASE  
                    WHEN dbsize >= reservedpages
                        THEN (convert(DECIMAL(15, 2), dbsize) - convert(DECIMAL(15, 2), reservedpages)) * 8192 / 1048576
                    ELSE 0
                    END
                ), 15, 2) + '' MB'')
FROM (
    SELECT dbsize = sum(convert(BIGINT, CASE  
                    WHEN type = 0
                        THEN size
                    ELSE 0
                    END))
        ,logsize = sum(convert(BIGINT, CASE  
                    WHEN type <> 0
                        THEN size
                    ELSE 0
                    END))
    FROM sys.database_files
) AS files
    SELECT reservedpages = sum(a.total_pages)
        ,usedpages = sum(a.used_pages)
        ,pages = sum(CASE  
                WHEN it.internal_type IN (
                        202
                        ,204
                        ,211
                        ,212
                        ,213
                        ,214
                        ,215
                        ,216
                    THEN 0
                WHEN a.type <> 1
                    THEN a.used_pages
                WHEN p.index_id < 2
                    THEN a.data_pages
                ELSE 0
                END)
    FROM sys.partitions p
    INNER JOIN sys.allocation_units a
        ON p.partition_id = a.container_id
    LEFT JOIN sys.internal_tables it
        ON p.object_id = it.object_id
) AS partitions'
if exists (select * from tempdb.sys.all_objects where name like '%#alldbstate%')
drop table #alldbstate  
create table #alldbstate  
(dbname sysname,
DBstatus varchar(55),
R_model Varchar(30))
--select * from sys.master_files
insert into #alldbstate (dbname,DBstatus,R_model)
select name,CONVERT(varchar(20),DATABASEPROPERTYEX(name,'status')),recovery_model_desc from sys.databases
--select * from #dbsize
insert into #dbsize(Dbname,dbstatus,Recovery_Model)
select dbname,dbstatus,R_model from #alldbstate where DBstatus <> 'online'
insert into #logsize(Dbname)
select dbname from #alldbstate where DBstatus <> 'online'
insert into #dbfreesize(name)
select dbname from #alldbstate where DBstatus <> 'online'
select  
d.Dbname,d.dbstatus,d.Recovery_Model,
(file_size_mb + log_file_size_mb) as DBsize,
d.file_Size_MB,d.Space_Used_MB,d.Free_Space_MB,
l.Log_File_Size_MB,log_Space_Used_MB,l.log_Free_Space_MB,fs.Freespace as DB_Freespace
from #dbsize d join #logsize l  
on d.Dbname=l.Dbname join #dbfreesize fs  
on d.Dbname=fs.name
order by Dbname