DBCC DBREINDEX Unexpected Results
Aug 9, 2004
Normally, after I use DBCC DBREINDEX, I can be sure that Scan Density on a clustered or non-clustered index is very good - eg. 99% or 100%. However, I have one database where there are a number of indexes that are not showing any improvement in Scan Density after running DBCC DBREINDEX. In on case, a clustered index, I run it on two days in succession and Scan Density actually go worse! Can anyone give me a reason for this? Can anyone suggest how to fix it?
Clive
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Jul 28, 2004
I have lost the reference but I read somewhere that when running DBCC DBREINDEX against a clustered index, all the secondary indexes on the table are automatically re-indexed as well. I did a test of this on a small table and it seemed to confirm this. However, now I've put this into practice, I am finding that it doesn't seem to work this way. I noticed that having run DBCC DBREINDEX against a table's clustered index (DBCC DBREINDEX ('tablename', 'clusteredIndexName', fill_factor)), the secondary indexes were not automatically re-indexed - as born out by the fact that they remained badly fragmented.
First of all, do the dba's who read this beleive it is correct that DBCC DBREINDEX run against a clustered index will automatically rebuild the secondary indexes too? If so, why wouldn't it work in all cases?
Clive
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May 11, 2006
What factors would make you decide to use DBCC DBREINDES instead of DBCC DEFRAG when you notice index defragmantation?
Thanks.
ekareem
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Jan 7, 2002
We are new to SQL Server and we are currently setting up a job that
does a dbreindex for tables that need it. I got the scripts for this
from swynk. 50 of the tables that needed a dbreindex,
(under 90% scan density) were not impacted by running the dbreindex.
I.e., I ran the dbreindex and it left it at 50% scan density.
The fill factor for these tables is set to 100%.
I tried update stats, updateusage...nothing changes....
I am sure there must be a logical reason as to why the dbreindex
had no impact on these tables. Does any one have any info on this?
Thanks in advance!
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Mar 21, 2001
I am executing a DBCC DBREINDEX for a table with about
4 million rown in SQL6.5. I has run for about
15 hrs now and is till running.
The index is the PK for the table and it is clustred index.
I ran it on a non clustered index on the same table and it ran for a couple of hrs.
Does any one have any idea how much time it might take for the clustered index?
I heard that this process might take more time and for one of my friends it ran for more than 40 hours.
I don;t have so much if time as th DB has to go for production to night and if not it might effect our businees.
I cancelled DBCC DBREINDEX before by killing the process and the master.DAT file got corrupted.I had to restore everytihng. Does anyone know any work around?
Help appreciated.
Thanks.
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Jun 11, 2001
Could users use database while running DBCC DBREINDEX for all tables in database?
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Aug 14, 2001
Hi,
I wanted to know is DBCC DBREINDEX is a logged operation?
The reason why I am asking this is, Whenever we create an index or drop an existing it is a logged operation. Is this the same when we do DBCC DBREINDEX? Is it drops existing indexes and creates new indexes. My concern here is about transaction log. If I run a DBCC DBREINDEX on a huge table with lot of indexes, Is it going to fill transaction log?
Any help is appreciated!
Thank you,
Ravi.
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Nov 7, 2000
About how long should I expect this to run? The Database is 200MB. The table I doing the reindex on has about 800 rows. Is an hour outrageous.. ?
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Aug 4, 2000
Hello!
SQL Server 7
After database clean up (removing old data)I run dbcc dbreindex.
Is it true I don't need to run UPDATE STATISTICS after DBCC DBREINDEX as since SQL Server 7 runs UPDATE STATISTICS automatically (after dbcc dbreindex).
Thank you.
Anny
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Mar 21, 2001
I am executing a DBCC DBREINDEX for a table with about
4 million rown in SQL6.5. I has run for about
15 hrs now and is till running.
The index is the PK for the table and it is clustred index.
I ran it on a non clustered index on the same table and it ran for a couple of hrs.
Does any one have any idea how much time it might take for the clustered index?
I heard that this process might take more time and for one of my friends it ran for more than 40 hours.
I don;t have so much if time as th DB has to go for production to night and if not it might effect our businees.
I cancelled DBCC DBREINDEX before by killing the process and the master.DAT file got corrupted.I had to restore everytihng. Does anyone know any work around?
Help appreciated.
Thanks.
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Jan 10, 2006
Hi All,
I have a following script:
DECLARE @TableName sysname
DECLARE cur_reindex CURSOR FOR
SELECT table_name
FROM information_schema.tables
WHERE table_type = 'base table'
OPEN cur_reindex
FETCH NEXT FROM cur_reindex INTO @TableName
WHILE @@FETCH_STATUS = 0
BEGIN
PRINT 'Rebuilding indexes ' + @TableName + ' table'
DBCC DBREINDEX (@TableName, ' ', 10)
FETCH NEXT FROM cur_reindex INTO @TableName
END
CLOSE cur_reindex
DEALLOCATE cur_reindex
GO
I added as a step in the job. However, when I run it I get an error message:
Msg 2501, Sev 16: Could not find a table or object named 'table_1'. Check sysobjects. [SQLSTATE 42S02]
When I run
SELECT table_name
FROM information_schema.tables
WHERE table_type = 'base table'
table_1 is the first on list. Any idea why I am getting this error message?
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May 17, 2004
Has anyone had the problem with DBCC DBREINDEX on a table/index not doing anything.
You just get the usual "DBCC execution completed. If DBCC printed error messages, contact your system administrator." message.
I have tried:
DBCC DBREINDEX ('<table_name>')
DBCC DBREINDEX (<table_name>)
DBCC DBREINDEX ('<table_name>', '')
DBCC DBREINDEX ('<table_name>', '<index_name>')
DBCC DBREINDEX ('<table_name>', '<index_name>', 80)
Maybe its "optimising" and not thinking anything needs updating.
Should I look for an alternative way of rebuilding an index like dropping and recreating?
The beauty with DBCC DBREINDEX ('<table_name>') would have been that I was going to get the list of user tables in the database and call it for each table to simply rebuild all indexes.
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Sep 21, 2007
DBCC CHECKDB;
GO
Result:
DBCC results for 'AgentsStateChanges'.
There are 2422697 rows in 46484 pages for object 'AgentsStateChanges'.
CHECKDB found 0 allocation errors and 92 consistency errors in table 'AgentsStateChanges' (object ID 2025058250).
Server: Msg 8934, Level 16, State 3, Line 1
Table error: Object ID 53575229, index ID 1. The high key value on page (1:193625) (level 0) is not less than the low key value in the parent (0:1), slot 0 of the next page (1:269532).
Server: Msg 8935, Level 16, State 1, Line 1
Table error: Object ID 53575229, index ID 1. The previous link (1:269531) on page (1:269532) does not match the previous page (1:193625) that the parent (1:272396), slot 252 expects for this page.
Server: Msg 8936, Level 16, State 1, Line 1
Table error: Object ID 53575229, index ID 1. B-tree chain linkage mismatch. (1:193625)->next = (1:269532), but (1:269532)->Prev = (1:269531).
Server: Msg 2511, Level 16, State 1, Line 1
Table error: Object ID 53575229, Index ID 2. Keys out of order on page (1:266856), slots 14 and 15.
Server: Msg 2511, Level 16, State 1, Line 1
Table error: Object ID 53575229, Index ID 2. Keys out of order on page (1:266856), slots 154 and 155.
Server: Msg 2511, Level 16, State 1, Line 1
Table error: Object ID 53575229, Index ID 2. Keys out of order on page (1:266869), slots 49 and 50.
DBCC DBREINDEX ('Vestel.dbo.AgentsStateChanges', PK_LLAgentFlowSummary, 0);
GO
Result:
Server: Msg 1505, Level 16, State 1, Line 1
CREATE UNIQUE INDEX terminated because a duplicate key was found for index ID 1. Most significant primary key is 'type 24, len 16'.
The statement has been terminated.
PLEASE HELP!;
GO
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Oct 10, 2001
Is it Nessary to disconnect users , go in single user mode to execute
DBCC DBREINDEX in SQL Server 2000 ?
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Jan 5, 2001
If I reindex tables on a production server and dump the transaction log then load that tran log to a
warm standby server --will the indices be rebuilt on the standby server? My guess is no,
but I've heard people say otherwise.
--jen
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Feb 5, 2001
when i run the dbcc dbreindex command it failed and message like this
[Microsoft][ODBC SQL Server Driver][Named Pipes]ConnectionCheckForData (PeekNamedPipe()).
[Microsoft][ODBC SQL Server Driver][Named Pipes]Connection broken.
Connection Broken
please help
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Feb 21, 2006
DBCC SHOWCONTIG shows following information. But after ran
DBCC DBREINDEX ('CM20100', ''), nothing changed.
What I did wrong? Thanks in advance.
******************************************************
DBCC SHOWCONTIG scanning 'CM20100' table...
Table: 'CM20100' (1957582012); index ID: 0, database ID: 16
TABLE level scan performed.
- Pages Scanned................................: 491
- Extents Scanned..............................: 159
- Extent Switches..............................: 158
- Avg. Pages per Extent........................: 3.1
- Scan Density [Best Count:Actual Count].......: 38.99% [62:159]
- Extent Scan Fragmentation ...................: 99.37%
- Avg. Bytes Free per Page.....................: 946.0
- Avg. Page Density (full).....................: 88.31%
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Jul 23, 2005
I have a stored proc that identifies indexes that need to bedefragmented ( LogicalFragmentation > 20% ) using DBCC SHOWCONTIG.This works fine and shows me all of the candidate indexes to bedefragged. I am using DBCC DBREINDEX to rebuild the indexes. What Inoticed yesterday is that it seems that DBREINDEX is not actually doinganything. I would check the target indexes, run DBREINDEX, then checkagain. The same list of indexes came up unchanged.What is strange is although I am not specifying "WITH NO_INFOMSGS" thisis the only output from the DBREINDEX:"DBCC execution completed. If DBCC printed error messages, contact yoursystem administrator."According to BOL DBREINDEX should return a result set if "NO_INFOMSGS"is not specified, but if "NO_INFOMSGS" is supplied the prior message iswhat is returned. This doesn't seem to be working correctly, or if itis, I have no idea where any error messages are being returned.Anyone have any ideas?
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Apr 20, 2007
Is this command, which I know can be executed on a per-table basis,the same as the Rebuild Index Task in the SQL Server Management Studiofor maintenance tasks??The documentation I have mentions the reindex.sql script, is this thescript that is executed by the Rebuild Index Task??Thank you, Tom
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May 15, 2008
Hi,
I've previously raised a thread about an index corruption issue we are getting on an infrequent basis. We are running SQL 2000 SP4, patched up with latest hotfixes on a cluster.
Yesterday, we experienced the corruption again. In the past, running DBCC DBREINDEX on the corrupted index has fixed the problem.
However, this time, even though DBCC DBREINDEX reported that it completed successfully, the corruption remained (proved by running DBCC CHECKTABLE on the index).
First question:
We created an identical index, with a different name, using the CREATE INDEX command, but this was created with the same corruption. Does SQL Server try and be clever and say "this index is the same as another, so I'll just copy that one instead of creating a new one" ? This is what would appear to be the case.
We then dropped the index and then recreated it. This time the index was fine.
Second question:
My understanding of DBCC DBREINDEX is that it drops and recreates the index. As manually dropping and recreating the index worked but DBCC DBREINDEX didn't I can only assume that this isn't the case. So what does it do?
This then begs a third question that, as I've been 'fixing' the issue in the past by running DBCC DBREINDEX, is it possible that it fixes it enough for DBCC CHECKTABLE to think it's been fixed, but deep down the problem has remained which is why the index has continued to corrupt a few weeks down the line?
If anyone can help answer these questions that would be really useful.
Thanks.
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May 16, 2000
I am trying to reindex a large table, and cannot because there isn't enough room on the the primary filegroup. the database consistes of one physical file in the primary filegroup. the table is over 50% of the size of the database. When the table is less than 50% of the size of the database, I do not see this problem.
BTW, the only index on the table is the primary key which consists of two columns, one is an integer and the other datetime.
It seems as if SQL server needs 1x the current size of the table to be free in order to reindex? Is this the case?
It is not an option for me to allow the database to autogrow. Is there anything else I can do?
Thanks for your help!
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Nov 21, 2003
Here is the DBCC CHECKDB error result:
Msg 8934, Sev 16:
Table error:
Object ID 517576882, index ID 1. The high key value on page (1:919) (level 0) is not less than the low key value in the parent (1:13120), slot 270 of the next page (1:920). [SQLSTATE 42000]
Object ID 517576882, index ID 1. The high key value on page (1:958) (level 0) is not less than the low key value in the parent (0:1), slot 0 of the next page (1:4043). [SQLSTATE 42000]
Object ID 517576882, index ID 1. The low key value on page (1:4043) (level 0) is not >= the key value in the parent (1:13120) slot 301. [SQLSTATE 42000]
Object ID 517576882, index ID 1. The high key value on page (1:4055) (level 0) is not less than the low key value in the parent (1:13120), slot 305 of the next page (1:4040).
Object ID 517576882, index ID 1. The previous link (1:3987) on page (1:4067) does not match the previous page (1:4069) that the parent (1:12804), slot 3 expects for this page.
Object ID 517576882, index ID 1. B-tree chain linkage mismatch. (1:4069)->next = (1:4067), but (1:4067)->Prev = (1:3987).
Object ID 517576882, index ID 1. The previous link (1:3987) on page (1:4071) does not match the previous page (1:4048) that the parent (1:13120), slot 313 expects for this page.
Object ID 517576882, index ID 1. B-tree chain linkage mismatch. (1:4048)->next = (1:4071), but (1:4071)->Prev = (1:3987).
--==================================
Then I do DBCC DBREINDEX (tblABC, '', 70)
get error of Server: Msg 1505, Level 16, State 1, Line 1
CREATE UNIQUE INDEX terminated because a duplicate key was found for index ID 1. Most significant primary key is '451396'.
However, don't find duplicates on the table PK which is index ID 1. (no another alternate uniqe key)
Thanks for help
David
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Aug 7, 2006
Hi,
I am facing a rather peculiar issue where I am getting a floating point exception error while rebuilding index for a particular table.
--------
Error Number : 3628
Message :
[Microsoft SQL-DMO (ODBC SQLState: 42000)] Error 3628: [Microsoft][ODBC SQL Server Driver][SQL Server]A floating point exception occurred in the user process. Current transaction is canceled.
[Microsoft][ODBC SQL Server
------------
This seems to be a rare issue ( as acknowledged by microsoft ) and they seem to suggest that it happens with SQL Server 2000 SP3 . I migrated my database into an SQL Server 2000 SP4 and started the rebuild again .. .. But it still failed with the same error ..
Am just hoping the microsoft guys are wrong and many of you have actually faced this stuff before.. Please let me know.
Thanks in advance,
Ranjit.
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Feb 1, 2004
Hi all,
Is it neccessay to run the "Update Statistics" after run "DBCC DBReindex"? Does "Update Statistics" automatically update the stats?
Thanks in advance
Kim,
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Mar 1, 2004
The error message is:
Location: recbase.cpp:1371
Expression: m_nVars > 0
SPID: 52
Process ID: 732
ODBC: Message 0£¬severity 16£¬state 1
Communication link failure
ODBC: Message 0£¬severity 16£¬state 1
Communication link failure
god , I have never seen error like that!
what will be reason for the error??
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Sep 26, 2005
(Assuming SQL Server 2000, auto create statistics on, auto updatestatistics on.)DoesDBCC DBREINDEX(<tablename>)update statistics? If yes, are the statistics equivalent to thosethat would be produced by:UPDATE STATISTICS <tablename> WITH FULLSCAN
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Aug 24, 2000
Hi All
Could you guys help me i have small problem in running dbcc dbreindex.I could run this command from dbo,sysadmin and
Object owner logins to rebuild the index but what i want to do is i want to run this command in a stored procedure.
this is also fine if i run the stored procedure any one of above logins it executes when i grant exec permission on this procedure
to public it will not execute in public group since public group is not a owner of this object..
How do i excute DBCC DBreindex from public group.Could you please help me.....................
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Jul 22, 2004
Microsoft states that dbcc DBREINDEX automatically updates statistics but INDEXDEFRAG does not. If this is the case, does MS mean that only the affected statistics are updated or all statistics? Also, is it a good idea to run 'Update Statistics' after doing INDEXDEFRAG?
Clive
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Jul 20, 2005
I'm running a simple DBCC DBREINDEX ('myTable') and I receive thefollowing error:"Server: Msg 169, Level 15, State 2, Line 2A column has been specified more than once in the order by list.Columns in the order by list must be unique. DBCC executioncompleted. If DBCC printed error messages, contact your systemadministrator."I can successfully reindex other tables in this database. I thoughtthat perhaps I had objects in the database that ended up with the samename, but I've pretty much ruled that out.Any suggestions?ThanksJohn D. Morrismailto://jmorris_42@hotmail.com
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Apr 6, 2001
Every time I execute DBCC DBREINDEX (Table_Name, '',0)WITH NO_INFOMSGS the server hangs. No error messages in windows 2000 logs or in the SQL 7.0 logs.
The table is about 2 gig in size and the index is a clustered index on two fields.
The server has 1 gig of memory and the cache hit ratio, and cache flushes both look good. Any ideas? Any help would be greatly appreciated.
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Mar 4, 2007
I am about to apply DBCC DBREINDEX to a large database that is part of transactional replication and synchronised every 3 minutes. What are the likely implication and what precautions I must take.
Thanks in advance
Regards
R Suresh
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Sep 21, 2007
Hi,
I'm trying to run what I thought was a relatively straightforward query to find all entries from one table that don't appear in another table:
select * from Search_Suggestion where Suggestion not in (select distinct C106 from Search_Log)
The Search_Suggestion table contains 4060 entries and the Search_Log table contains 142,000+ distinct entries.
From running a similar query using 'in' instead of 'not in' I find that there are 3778 matches between the two tables would logic which suggest leave 282 that don't exist in the Search_Log table.
However....when I run the above query it returns no records.
I've tried changing it around and have also tried using temp tables but each time I still get no records.
Any help wouldbe greatly appreciated.
Kind regards,
Steve
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Jul 8, 2006
hi, hvae a little trouble with thos procedure.
When executed it always adds 2 to the value of fields Telefon and Mobil.
Can anyone help me, please
Kurt
ALTER Procedure opdaterbruger
(
@Initialer nvarchar(100),
@Mailadr nvarchar(100),
@Telefon float(8),
@PlusNet float(8),
@Mobil float(8),
@pnmobil float(8)
)
AS
UPDATE Brugere
SET Mailadresse = @Mailadr
WHERE Initialer = @Initialer
IF (@Initialer= '0') OR NOT EXISTS ( SELECT * FROM PNetlokal WHERE Bruger = @Initialer)
INSERT INTO pnetlokal ( Bruger, Kortnr, Telnr )
VALUES ( @initialer, @Plusnet, @Telefon)
ELSE
UPDATE PNetLokal
SET TelNr = @Telefon, KortNr = @PlusNet
WHERE Bruger = @Initialer
IF (@Initialer= '0') OR NOT EXISTS (SELECT * FROM PlusNet WHERE Bruger = @Initialer )
INSERT INTO plusnet (Bruger, Kortnr, Mobilnr)
VALUES (@initialer, @pnMobil, @mobil)
ELSE
UPDATE PlusNet
SET Mobilnr = @Mobil, KortNr = @pnmobil
WHERE Bruger = @Initialer
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