Help With Showcontig

Jul 20, 2005

Hi,

i'm on windows nt4 sp6a , sql server 7.00.0842

i have something that i don't understand.
The table 'source' is taking lot of space but when i bcp out, the file take
only 11MB (fixed delimiter option)
i issue showontig and it says me that Avg. Page Density
(full).....................: 4.33%
so if i understand there are a lot of space wasted per page
so i issue DBCC DBREINDEX('dbo.source', '', 50) and i expect to have Avg.
Page Density (full).....................: 50%
but it's still the same even after dbcc update usage on that table

at alst, i've done a select * into test from source and the test table take
only 11MB like the bcp out. (1290 pages insted of 32923 pages of the source
table)

so what can i do to reduce the 'source' table ?

if anayone can help me ?

the table 'source' the ddl is :

CREATE TABLE dbo.source
(
f1_id numeric(18,0) NOT NULL,
f2_id numeric(18,0) NOT NULL,
f3_id numeric(28,0) IDENTITY,
f4_id char(300) NOT NULL,
CONSTRAINT pk_source_compid_tranid
PRIMARY KEY NONCLUSTERED (f1_id,f2_id,f3x_id) WITH FILLFACTOR=50 ON
[PRIMARY]
)


sp_spaceused 'source'

name rows reserved data index_size unused
source 29701 287088 KB 263400 KB 23400 KB 288 KB




USE appli
go
DBCC UPDATEUSAGE('appli', 'dbo.source')
WITH COUNT_ROWS
go
DBCC SHOWCONTIG(702625546)
go
DBCC DBREINDEX('dbo.source', '', 50)
go
DBCC UPDATEUSAGE('appli', 'dbo.source')
WITH COUNT_ROWS
go
DBCC SHOWCONTIG(702625546)





The command executed successfully with no results returned.
DBCC execution completed. If DBCC printed error messages, contact your
system administrator.
DBCC SHOWCONTIG scanning 'source' table...
Table: 'source' (702625546); index ID: 0, database ID: 12
TABLE level scan performed.
- Pages Scanned................................: 32923
- Extents Scanned..............................: 4122
- Extent Switches..............................: 4121
- Avg. Pages per Extent........................: 8.0
- Scan Density [Best Count:Actual Count].......: 99.85% [4116:4122]
- Extent Scan Fragmentation ...................: 95.41%
- Avg. Bytes Free per Page.....................: 7743.9
- Avg. Page Density (full).....................: 4.33%

DBCC execution completed. If DBCC printed error messages, contact your
system administrator.

Index (ID = 2) is being rebuilt.
Index (ID = 3) is being rebuilt.
Index (ID = 4) is being rebuilt.
Index (ID = 5) is being rebuilt.
Index (ID = 6) is being rebuilt.

DBCC execution completed. If DBCC printed error messages, contact your
system administrator.

DBCC UPDATEUSAGE: sysindexes row updated for table 'source' (index ID 2):
USED pages: Changed from (2391) to (2390) pages.
RSVD pages: Changed from (2400) to (2401) pages.
DBCC UPDATEUSAGE: sysindexes row updated for table 'source' (index ID 3):
USED pages: Changed from (201) to (200) pages.
RSVD pages: Changed from (208) to (209) pages.
DBCC UPDATEUSAGE: sysindexes row updated for table 'source' (index ID 4):
USED pages: Changed from (335) to (334) pages.
RSVD pages: Changed from (344) to (345) pages.
DBCC UPDATEUSAGE: sysindexes row updated for table 'source' (index ID 0):
USED pages: Changed from (35843) to (35849) pages.
RSVD pages: Changed from (35882) to (35885) pages.
DBCC execution completed. If DBCC printed error messages, contact your
system administrator.
DBCC SHOWCONTIG scanning 'source' table...

Table: 'source' (702625546); index ID: 0, database ID: 12
TABLE level scan performed.
- Pages Scanned................................: 32923
- Extents Scanned..............................: 4122
- Extent Switches..............................: 4121
- Avg. Pages per Extent........................: 8.0
- Scan Density [Best Count:Actual Count].......: 99.85% [4116:4122]
- Extent Scan Fragmentation ...................: 95.41%
- Avg. Bytes Free per Page.....................: 7743.9
- Avg. Page Density (full).....................: 4.33%
DBCC execution completed. If DBCC printed error messages, contact your
system administrator.

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ShowContig

Nov 9, 1999

Is there a way to simply capture only the Table Name (or tbl ID), Index Name (or Idx ID) and Scan Density information from the output of DBCC Showcontig?

I would like to dump these elements into a table for some additional analysis/queries.

Thank you,
Troy

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I was attempting to run the dbcc command on a couple of my databases and I get some errors on some servers but not others. Is there a reason for this?
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Here are the commands and errors

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Server: Msg 2583, Level 16, State 3, Line 1
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Server: Msg 2560, Level 16, State 14, Line 1
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May 8, 2002

Hi

Here us the Output of DBCC SHOWCONTIG for one of my tables

Row Size = 82 (i.e Sum of the lengths of all the Columns)
No: of Rows = 162 (No of Rows in the table)

162 Rows can fit in two pages, Is there any way to make sure that these pages go on a same Extent so that my Scan Density will be 100.00% ( Ratio of Extent Switches to the Extent Scanned)

I tried all the Combinations of rebuilding the Clustered Indexes,BCP out the data and BCP IN, But all in vain....It does not put the pages in a same extent.

Any Help in this regard is greatly appreciated!!

DBCC SHOWCONTIG scanning 'VENU_TEMP1' table...
Table: 'VENU_TEMP1' (1681441064); index ID: 1, database ID: 18
TABLE level scan performed.
- Pages Scanned................................: 2
- Extents Scanned..............................: 2
- Extent Switches..............................: 1
- Avg. Pages per Extent........................: 1.0
- Scan Density [Best Count:Actual Count].......: 50.00% [1:2]
- Logical Scan Fragmentation ..................: 0.00%
- Extent Scan Fragmentation ...................: 50.00%
- Avg. Bytes Free per Page.....................: 58.0
- Avg. Page Density (full).....................: 99.28%
DBCC execution completed. If DBCC printed error messages, contact your system administrator.


Thanks In Advance
Venu

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May 17, 2001

Results are -
- Pages Scanned................................: 21767
- Extents Scanned..............................: 2738
- Extent Switches..............................: 19919
- Avg. Pages per Extent........................: 7.9
- Scan Density [Best Count:Actual Count].......: 13.66% [2721:19920]
- Logical Scan Fragmentation ..................: 91.57%
- Extent Scan Fragmentation ...................: 29.69%
- Avg. Bytes Free per Page.....................: 4409.4
- Avg. Page Density (full).....................: 45.52%

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Could someone drop some lines.

Thanks a lot.
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Jul 17, 2001

Does anyone know of a way to capture the results of DBCC ShowContig. My intentions are to capture these results, particularly the Avg. Page Density value and build my Reindexing jobs based on those values. Any ideas would be appreciated.
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Dear sir
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Hi,
Ive just created a table, clustered index with fillfactor 70% (as it will be doing thousands of inserts and deletions daily).
After a few thousand inserts, i run dbcc showcontig on the table.

Result:
---------
Table: 'MyTable' (1650104919); index ID: 1, database ID: 10
TABLE level scan performed.
- Pages Scanned................................: 5460
- Extents Scanned..............................: 686
- Extent Switches..............................: 1885
- Avg. Pages per Extent........................: 8.0
- Scan Density [Best Count:Actual Count].......: 36.21% [683:1886]
- Logical Scan Fragmentation ..................: 13.19%
- Extent Scan Fragmentation ...................: 0.29%
- Avg. Bytes Free per Page.....................: 2083.2
- Avg. Page Density (full).....................: 74.26%

***the Extent switches just balloons out, and scan density drops badly. is this terrible?

Also - What is the main difference between "Logical Scan Fragmentation" & "Extent Scan Fragmentation". Every time, its either one of these values is much higher than the other. What is the best practice, which of the 2 should I be trying to keep fragmentation low?

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DBCC SHOWCONTIG scanning 'MYTAB' table...
Table: 'MYTAB'(50099219); index ID: 1, database ID: 7
TABLE level scan performed.
- Pages Scanned................................: 150
- Extents Scanned..............................: 25
- Extent Switches..............................: 25
- Avg. Pages per Extent........................: 6.0
- Scan Density [Best Count:Actual Count].......: 73.08% [19:26]
- Logical Scan Fragmentation ..................: 1.33%
- Extent Scan Fragmentation ...................: 96.00%
- Avg. Bytes Free per Page.....................: 878.5
- Avg. Page Density (full).....................: 89.15%
DBCC execution completed. If DBCC printed error messages, contact your system administrator.

Since Extents Scanned and Extent Switches r equal, why the density is slow, what about pages per Extent, can it be manaully increased?

Howdy

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Hi

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DBCC SHOWCONTIG scanning 'publishers' table...
Table: 'publishers' (2057058364); index ID: 1, database ID: 5
TABLE level scan performed.
- Pages Scanned................................: 1
- Extents Scanned..............................: 1
- Extent Switches..............................: 0
- Avg. Pages per Extent........................: 1.0
- Scan Density [Best Count:Actual Count].......: 100.00% [1:1]
- Logical Scan Fragmentation ..................: 100.00%
- Extent Scan Fragmentation ...................: 0.00%
- Avg. Bytes Free per Page.....................: 7699.0
- Avg. Page Density (full).....................: 4.88%

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Extent Scan Fragmentation should be 0%

Here Logical Scan Fragmentation ..................: 100.00%
So I ran the DBCC INDEXDEFRAG command

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Oct 11, 2007

Greetings.

I'm currently on a company with an ms sql server 2000. I'm looking into the indexes and tables to see if there are some bottlenecks there but the LogicalFramentation is very low in the index I have searched.

However, this table has a logicalFragmentation of 99,9215698242188 which I get when I do DBCC SHOWCONTIG ([TInsurance]) WITH TABLERESULTS. Is that a value to be trusted or not to be trusted since this does not check an index? If it is, how do I defrag a table? I know only how to defrag an index. (example: DBCC INDEXDEFRAG (MFSSEK,[TInsurance], PK_InsuranceID) )

Tipps, suggestions, help, all is very wellcome! :-)



DBCC SHOWCONTIG scanning 'TInsurance' table...
Table: 'TInsurance' (2051694557); index ID: 0, database ID: 17
TABLE level scan performed.
- Pages Scanned................................: 1275
- Extents Scanned..............................: 225
- Extent Switches..............................: 224
- Avg. Pages per Extent........................: 5.7
- Scan Density [Best Count:Actual Count].......: 71.11% [160:225]
- Extent Scan Fragmentation ...................: 74.67%
- Avg. Bytes Free per Page.....................: 520.0
- Avg. Page Density (full).....................: 93.58%
DBCC execution completed. If DBCC printed error messages, contact your system administrator.

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Aug 21, 2001

Hello,

I'm new to SQL Server, can somebody please give me a good explaination about whats wrong in the following table stats. I tried to see it in BOL, but I wuold appreciate if someone can suggest me the rules here, for expample what should be the ideal scan density and so on. Also let me know what one should do if there are some problems like mentioned below:

Thanks in advance.
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DBCC SHOWCONTIG scanning 'OrderDetails' table...
Table: 'OrderDetails' (2141354793); index ID: 1, database ID: 7
TABLE level scan performed.
- Pages Scanned................................: 24168
- Extents Scanned..............................: 3034
- Extent Switches..............................: 4984
- Avg. Pages per Extent........................: 8.0
- Scan Density [Best Count:Actual Count].......: 60.60% [3021:4985]
- Logical Scan Fragmentation ..................: 65.76%
- Extent Scan Fragmentation ...................: 2.80%
- Avg. Bytes Free per Page.....................: 775.8
- Avg. Page Density (full).....................: 90.42%
DBCC execution completed. If DBCC printed error messages, contact your system administrator.

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Nov 3, 2005

hi,
I am running this :
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i got error below:

Server: Msg 2501, Level 16, State 45, Line 1
Could not find a table or object named 'EMPLOYEE_EXTRACT'. Check sysobjects.
DBCC execution completed. If DBCC printed error messages, contact your system administrator.

Then i look for that table name in sysobjects table it return me a record with that name
select [name] from sysobjects where [name] ='EMPLOYEE_EXTRACT'

what is the problem here? - Any idea would be greatly appreciated.
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Nov 15, 2007

Dear Experts,
just now i've read a great article from sql server performance.com
and understand several key factors related to performance.

still i have one doubt that what will be the best ratio between
extents scanned and extent switches.

here i'm pasting some of my table result. please suggest me how is the performance of the table

table 1

- Pages Scanned................................: 85618
- Extents Scanned..............................: 11283
- Extent Switches..............................: 85405
- Avg. Pages per Extent........................: 7.6
- Scan Density [Best Count:Actual Count].......: 12.53% [10703:85406]
- Logical Scan Fragmentation ..................: 49.93%
- Extent Scan Fragmentation ...................: 46.31%
- Avg. Bytes Free per Page.....................: 2707.1
- Avg. Page Density (full).....................: 66.55%


table2

- Pages Scanned................................: 60648
- Extents Scanned..............................: 7650
- Extent Switches..............................: 60639
- Avg. Pages per Extent........................: 7.9
- Scan Density [Best Count:Actual Count].......: 12.50% [7581:60640]
- Logical Scan Fragmentation ..................: 50.93%
- Extent Scan Fragmentation ...................: 64.01%
- Avg. Bytes Free per Page.....................: 2672.5
- Avg. Page Density (full).....................: 66.98%

thankyou very much


Vinod
Even you learn 1%, Learn it with 100% confidence.

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Nov 26, 2007

all,

reindex just ran on friday... how is it possible to have a logical
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100 and pages cannot be reorganized any better with this arrangement?
thanks

TABLE level scan performed.
- Pages Scanned................................: 15842685
- Extents Scanned..............................: 1981052
- Extent Switches..............................: 2071631
- Avg. Pages per Extent........................: 8.0
- Scan Density [Best Count:Actual Count].......: 95.59% [1980336:2071632]
- Logical Scan Fragmentation ..................: 97.91%
- Extent Scan Fragmentation ...................: 0.21%
- Avg. Bytes Free per Page.....................: 49.2
- Avg. Page Density (full).....................: 99.39%

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Jul 23, 2005

I have a table where I store around 1 million rows for 7 days.I run a DBCC SHOWCONTIG every week and I noticed that the number ofRows and the Average Free Bytes are stable but the number of Extentsand the Average Record Size keeps increasing.Any idea how to explain this incrase? and how to stop it? Will DBCCDBREINDEX will help?Here is my data:Rows: 1166273 (same as last week)Extents: 147099 (+10% since last week)Max RecordSize: 7050Average Record Size: 7688 (+10% since last week)AverageFreeBytes: 372Average Page Density: 95Scan density: 30

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Apr 22, 2004

I ran an INDEXDEFRAG against the tables in my DB, & yet the results in DBCC SHOWCONTIG are the same before and after for some of the tables that it defragmented. Why?

In the DBCC SHOWCONTIG before defragging, this was a sample table:

Table1:
- Pages Scanned................................: 2279
- Extents Scanned..............................: 294
- Extent Switches..............................: 293
- Avg. Pages per Extent........................: 7.8
- Scan Density [Best Count:Actual Count].......: 96.94% [285:294]
- Extent Scan Fragmentation ...................: 4.42%
- Avg. Bytes Free per Page.....................: 358.9
- Avg. Page Density (full).....................: 95.57%


I ran the script from the BOL entry for 'DBCC SHOWCONTIG' to defragment all indexes in a database , under letter E, with @maxfrag = 5%. It returned the following results (there are 5 nonclustered indexes):

Executing DBCC INDEXDEFRAG (0, table1,
3) - fragmentation currently 13%
Pages Scanned Pages Moved Pages Removed
------------- ----------- -------------
1146 1088 0

(1 row(s) affected)
(1 row(s) affected)

DBCC execution completed. If DBCC printed error messages, contact your system administrator.
Executing DBCC INDEXDEFRAG (0, table1,
4) - fragmentation currently 13%
Pages Scanned Pages Moved Pages Removed
------------- ----------- -------------
509 509 0

(1 row(s) affected)
(1 row(s) affected)

DBCC execution completed. If DBCC printed error messages, contact your system administrator.
Executing DBCC INDEXDEFRAG (0, table1,
5) - fragmentation currently 13%
Pages Scanned Pages Moved Pages Removed
------------- ----------- -------------
509 509 0

(1 row(s) affected)
(1 row(s) affected)

DBCC execution completed. If DBCC printed error messages, contact your system administrator.
Executing DBCC INDEXDEFRAG (0, table1,
6) - fragmentation currently 13%
Pages Scanned Pages Moved Pages Removed
------------- ----------- -------------
720 685 0



Running DBCC SHOWCONTIG again, the results were exactly the same for Table1.


Thanks for any advice to interpret this information.

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May 21, 2008

Dear All,
i've used the DBCC showcontig command against my table table103
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the results are:
DBCC SHOWCONTIG scanning 'TABLE103' table...
Table: 'TABLE103' (1899257921); index ID: 1, database ID: 10
TABLE level scan performed.
- Pages Scanned................................: 20
- Extents Scanned..............................: 13
- Extent Switches..............................: 18
- Avg. Pages per Extent........................: 1.5
- Scan Density [Best Count:Actual Count].......: 15.79% [3:19]
- Logical Scan Fragmentation ..................: 90.00%
- Extent Scan Fragmentation ...................: 92.31%
- Avg. Bytes Free per Page.....................: 3281.4
- Avg. Page Density (full).....................: 59.46%

Vinod
Even you learn 1%, Learn it with 100% confidence.

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Can someone please help me interpret this result set below and suggeston way I can speed up my table? What changes should I make?DBCC SHOWCONTIG scanning 'tblListing' table...Table: 'tblListing' (1092914965); index ID: 1, database ID: 13TABLE level scan performed.- Pages Scanned................................: 97044- Extents Scanned..............................: 12177- Extent Switches..............................: 13452- Avg. Pages per Extent........................: 8.0- Scan Density [Best Count:Actual Count].......: 90.17% [12131:13453]- Logical Scan Fragmentation ..................: 0.86%- Extent Scan Fragmentation ...................: 2.68%- Avg. Bytes Free per Page.....................: 1415.8- Avg. Page Density (full).....................: 82.51%DBCC execution completed. If DBCC printed error messages, contact yoursystem administrator.Thank you.

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Hi:

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I created a table and let insert to it via above "DBCC...."
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thanks
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--=========================================
DBCC execution completed. If DBCC printed error messages, contact your system administrator.
ObjectName ObjectId IndexName IndexId Level Pages Rows MinimumRecordSize MaximumRecordSize AverageRecordSize ForwardedRecords Extents ExtentSwitches AverageFreeBytes AveragePageDensity ScanDensity BestCount ActualCount LogicalFragmentation ExtentFragmentation
-------------------------------------------------------------------------------------------------------------------------------- ----------- -------------------------------------------------------------------------------------------------------------------------------- ----------- ----------- -------------------- -------------------- ----------------- ----------------- ---------------------- -------------------- -------------------- -------------------- ---------------------- ---------------------- ---------------------- -------------------- -------------------- ---------------------- ----------------------
sysproxylogin 37575172 clust 1 0 0 0 0 0 0 0 0 0 0 0 100 0 0 0 0

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