thanks, Mark. Here is the results with your guide:
sp_helpdb tempdb
go
name db_size owner dbid created status
1 tempdb 2003.0 MB sa 2 Oct 14, 2014 select into/bulkcopy/pllsort, trunc log on chkpt, ddl in tran, abort tran on log full
name attribute_class attribute int_value char_value comments
1 tempdb buffer manager cache binding 1 tempdb data cache [NULL]
device_fragments size usage created free kbytes
1 master 3.0 MB data only Apr 9 2011 11:25AM 1866
2 tempdb_data 1500.0 MB data only Apr 9 2011 1:27PM 1529940
3 tempdb_logs 500.0 MB log only Apr 9 2011 1:27PM not applicable
1 log only free kbytes = 509930
sp_helpdevice
device_name physical_name description status cntrltype device_number low high
go
19 tempdb_data /db/oe/tempdb/tempdb_data.dat special, dsync off, physical disk, 1500.00 MB 2 0 3 50331648 51099647
20 tempdb_logs /db/oe/tempdb/tempdb_logs.dat special, dsync off, physical disk, 500.00 MB 2 0 4 67108864 67364863
---Without insert
exec sp_1 -- does the basic select * from mytab
1 Total actual I/O cost for this command: 0.
2 Total writes for this command: 0
3
4 Execution Time 0.
5 SQL Server cpu time: 0 ms. SQL Server elapsed time: 0 ms.
1 10/15/2014 1:00:49.613 PM
1 Total actual I/O cost for this command: 0.
2 Total writes for this command: 0
3
4 Execution Time 0.
5 SQL Server cpu time: 0 ms. SQL Server elapsed time: 0 ms.
6 Total actual I/O cost for this command: 0.
7 Total writes for this command: 0
8
9 Execution Time 0.
10 SQL Server cpu time: 0 ms. SQL Server elapsed time: 3 ms.
status
1 11150 C.
2 7795 D.
3 13618 DIR
4 1445 EXE
5 48 GMD
6 55 IMD
7 66471 M.
8 374 NMD
9 2383 REG
1 Table: tab1 scan count 4, logical reads: (regular=124929 apf=0 total=124929), physical reads: (regular=0 apf=0 total=0), apf IOs used=0
2 Table: tab2 scan count 204728, logical reads: (regular=235956 apf=0 total=235956), physical reads: (regular=0 apf=0 total=0), apf IOs used=0
3 Table: tab2 scan count 1, logical reads: (regular=5 apf=0 total=5), physical reads: (regular=0 apf=0 total=0), apf IOs used=0
4 Table: Worktable1 scan count 5, logical reads: (regular=151 apf=0 total=151), physical reads: (regular=0 apf=0 total=0), apf IOs used=0
5 Total actual I/O cost for this command: 722082.
6 Total writes for this command: 0
7
8 Execution Time 0.
9 SQL Server cpu time: 0 ms. SQL Server elapsed time: 1796 ms.
1 10/15/2014 1:00:51.413 PM
1 Total actual I/O cost for this command: 0.
2 Total writes for this command: 0
3
4 Execution Time 0.
5 SQL Server cpu time: 0 ms. SQL Server elapsed time: 0 ms.
---With insert
exec sp_2 -- does the basic select * from mytab
1 Total actual I/O cost for this command: 0.
2 Total writes for this command: 0
3
4 Execution Time 0.
5 SQL Server cpu time: 0 ms. SQL Server elapsed time: 0 ms.
1 10/15/2014 1:01:35.833 PM
1 Total actual I/O cost for this command: 0.
2 Total writes for this command: 0
3
4 Execution Time 0.
5 SQL Server cpu time: 0 ms. SQL Server elapsed time: 0 ms.
6 Total actual I/O cost for this command: 0.
7 Total writes for this command: 0
8
9 Execution Time 0.
10 SQL Server cpu time: 0 ms. SQL Server elapsed time: 0 ms.
11 Table: #table1______02000450014068719 scan count 0, logical reads: (regular=18 apf=0 total=18), physical reads: (regular=0 apf=0 total=0), apf IOs used=0
12 Table: tab1 scan count 1, logical reads: (regular=121953 apf=0 total=121953), physical reads: (regular=0 apf=0 total=0), apf IOs used=0
13 Table: tab2 scan count 204728, logical reads: (regular=229304 apf=0 total=229304), physical reads: (regular=0 apf=0 total=0), apf IOs used=0
14 Table: tab2 scan count 1, logical reads: (regular=5 apf=0 total=5), physical reads: (regular=0 apf=0 total=0), apf IOs used=0
15 Table: Worktable1 scan count 1, logical reads: (regular=29 apf=0 total=29), physical reads: (regular=0 apf=0 total=0), apf IOs used=0
16 Total actual I/O cost for this command: 702618.
17 Total writes for this command: 0
18
19 Execution Time 31.
20 SQL Server cpu time: 3100 ms. SQL Server elapsed time: 3226 ms.
1 10/15/2014 1:01:39.060 PM
1 Total actual I/O cost for this command: 0.
2 Total writes for this command: 0
3
4 Execution Time 0.
5 SQL Server cpu time: 0 ms. SQL Server elapsed time: 0 ms.
The difference is:
11 Table: #table1______02000450014068719 scan count 0, logical reads: (regular=18 apf=0 total=18), physical reads: (regular=0 apf=0 total=0), apf IOs used=0
Does this cause performance difference?