Rebuilding Indexes
Feb 23, 2004
Hello all,
I need to diagnose a problem, this Sunday a regular Database Maintenance plan which is supposed to rebuild indexes took exactly 6 hours and 32 minutes. Now that’s a hell lot of time and during all that process users were denied access to those tables. This is a production server. I want to know what caused that plan to run for so long and how can I avoid this to happen again plus if it ever happens again how can I make sure that atleast it doesn’t lock tables. I know DBCC INDEXDEFRAG doesn’t lock tables but how can I make Database Maintenance plan to run DBCC INDEXDEFRAG instead of DBCC DBREINDEX but more importantly why it took 6 hours.
Thanks all
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Jan 14, 2002
Hi!
I was wondering what kind of locks (if any) SQL Server 2000 holds on tables while rebuilding clustered and non-clustered indexes.
Thanks!
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Sep 20, 2000
Do anyone know how to rebuild indexes on the maintenance plan??
I would like to automate rebuilding my indexes on the database about once every month.
I know you can manually do this by using DBCC DBREINDEX. This is to long and tedious.
Thanks in advance!
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Dec 2, 1999
All,
I have scheduled dbreindex command to run on an clustered indexed on a very large table over night, so far this as failed to complete successfully. I think it may have something to do with the amount of space available in the device; the table is approx 238mb in size and the available disk space left in the device is 200 mb.
Does anyone know how much space is required to reindex a table/index this size and if it is required on the same device as the table or in tempdb.
Or even better, if anyone can explain the inter-workings of how the dbreindex command reorgs the table.
Thanks Mathew
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Feb 23, 2004
Hello all,
I need to diagnose a problem, this Sunday a regular Database Maintenance plan which is supposed to rebuild indexes took exactly 6 hours and 32 minutes. Now that’s a hell lot of time and during all that process users were denied access to those tables. This is a production server. I want to know what caused that plan to run for so long and how can I avoid this to happen again plus if it ever happens again how can I make sure that atleast it doesn’t lock tables. I know DBCC INDEXDEFRAG doesn’t lock tables but how can I make Database Maintenance plan to run DBCC INDEXDEFRAG instead of DBCC DBREINDEX but more importantly why it took 6 hours.
Thanks all
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Jan 14, 2002
(Oops, sorry I posted this on the SQL 7 discussion earlier).
----------------------
I was wondering what kind of locks (if any) SQL Server 2000 holds on tables while rebuilding clustered and non-clustered indexes.
Thanks!
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Jun 13, 2008
Hello,
I'm new to rebuilding and reorg indexes. I used the standard report feature in 2005 to look up Index Physical Statistics on one db. I found recommendation to rebuild a few indexes that contain a number of fragments. I created a maint. task, I know maint. tasks are not a cure-all but so far I am just testing the waters. I created two tasks, one to rebuild and another to reorg. After I ran the job, I looked at the report and it still showed recommendation to rebuild the indexes. What is a better solution for my case?
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Feb 25, 2007
Hi,
I have recenlty had to rebuild the indexes for the entire database as they were running a little slow. It prompted me to further investigate the health of the indexes on the database. I have been using the sys.dm_db_index_physical_stats view to do this. I had a query with regards to the avg_fragmentation_in_percent column that the view displays. I have rebuilt all the indexes and for some of the indexes the fragmentation value remains the same. The following is an example of what is returned by the sys.dm_db_index_physical_stats for a single index:
Table, IndexName, avg_fragmentation_in_percent, avg_page_space_used_in_percent
Links, PK_Links, 77.7777777777778, 97.1501606127996
Links, PK_Links, 0, 1.42080553496417
I do not understand why this index the fragmentation is so high even though I have rebuilt it. It is not just this index it occurs for other indexes as well. What could be some of the factors that are causing this to occur?
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Jul 20, 2005
HiI got the advice to rebuild the indexes on the databases once a year.Espesially if the database have grown much. The question is: How do Ido that?If I try to run the indexscript wich was run when the databases werecreated, I only get the message that the indexes already exists.Are there a command to automatically rebuild the indexesautomatically?Roger
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Sep 14, 2006
Aight, so I added a full text catalog and a full text index for one specific column and table in my database.Now the issue is, whenever I rebuild it, it locks the full text index forever, making it unsuable. Now, there are only 30,000 records i need to search, so it isn't like there is this massive amount of data. What am I doing wrong to where it is locking the index and disallowing me to use the stored procedure that does the searching?
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Mar 19, 2015
Is it possible to reclaim space after rebuilding indexes(shrinking is not an option).
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Jul 23, 2015
Currently we are facing some performance issue while accessing the archive data from the archive tables. the archive table is hugh and it contains around 100,000,000 records and this archive table is being used in few reports and in our commission cycles too. since we are facing performance issues we are rebuilding index once in a week on all the indexes on this archive table.
We have 1 clustered index and 5 non clustered indexes, every time when we rebuild all these indexes on this table it is taking more time, more often rebuilding the clustered index itself is taking approx. 1hr which is consuming more time. wanted to know is there any useful to rebuild clustered indexes or not, if yes then what would be the better way. if not then do we need to rebuild only non clustered indexes.
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Sep 26, 2007
Hi all,
When I am rebuilding the indexes on the tables, I am getting lot of free space( unallocated) on the database.
Before rebuilding the indexes , the size of the database = 385 Gb
After rebuilding the indexes, the size jumps to = 572 Gb (i.e.) This means 187 Gb of unallocated space .
The Command use to rebuild indexes is:
USE [databasename]
GO
ALTER INDEX [PK_index] ON [dbo].[tablename] REBUILD WITH
( PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, SORT_IN_TEMPDB = ON, ONLINE = OFF )
GO
So, every time we rebuild indexes, we have to shrink the database
(or)
Is there anything else ,I should be doing.
Thanks.
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Jul 7, 2015
I have come across a database system which isn't designed to work optimally. It is fairly large (~400GB) and performance of loading and querying is degrading (improper data types, fragmented indexes, non unique clustering key and other problems). So, I have quite a task in front of me, but I am up for the challenge. I figure this is not a unique situation, many of us would have come across this before. I have done this before too, but only for smaller databases, some of the operations here I expect to take a couple of hours or more to complete (depending on load/infrastructure speed etc, I know).
My plan is thus:
+ Take a full backup of the database
+ Set the recovery model of the DB to simple
+ Drop non clustered indexes
+ Drop clustered indexes
+ Remove PKs (wrong data types, too large!)
+ Narrow data types (add new column, update column in batches to old value, rename new column to old column)
+ Add PKs, which will create clustered indexes automatically based on PK ID
+ Create non clustered indexes
+ Run a SHRINKDB (normal operations I would never do this, but this is a special case, ensure log file is truncated to a logical size especially after all those table modifications...)
+ Set the recovery model of the DB to Full
+ Ensure everything works OK or better
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Feb 25, 2008
I am trying to automate my index rebuild and reorg based off of the percentage of fragmentation level. The first time you run it you have to change the alter proce Sp_NCRNRecreate then change it to Alter proc. It seems to run okay no errors but it doesn't seem to actually rebuild them. Please take a look and let me know if you see a program error somewhere. I would like create this sp to run automatically
use master
GO
Alter PROC sp_NCR_RecreateIndexes @AutoRun bit=0 AS
BEGIN
DECLARE @DatabaseName varchar(128), @SchemaName varchar(128), @objectName varchar(128), @IndexName varchar(128), @PercentFragmented float, @command varchar(max)
SELECT db_name(s.database_id) as DatabaseName, schema_name(o.schema_id) as SchemaName, o.name as TableName, i.name as IndexName, s.avg_fragmentation_in_percent AS PercentFragmented
INTO #IndexesToRebuild
FROM sys.dm_db_index_physical_stats (db_id(), Null, NULL, NULL, NULL) s
INNER JOIN sys.objects o ON s.object_id=o.object_id
INNER JOIN sys.indexes i ON s.object_id=i.object_id AND s.index_id=i.index_id
WHERE s.avg_fragmentation_in_percent > 10.0 AND s.index_id > 0
SELECT * FROM #IndexesToRebuild
DECLARE IndexCursor CURSOR FOR SELECT DatabaseName, SchemaName, TableName, IndexName, PercentFragmented FROM #IndexesToRebuild
OPEN IndexCursor
FETCH IndexCursor INTO @DatabaseName, @SchemaName, @objectName, @IndexName, @PercentFragmented
WHILE @@FETCH_STATUS=0
BEGIN
SELECT @command = 'ALTER INDEX ' + @indexname +' ON ' + @databaseName + '.' + @schemaname + '.' + @objectName + CASE WHEN @PercentFragmented<30 THEN ' REORGANIZE' ELSE ' REBUILD' END;
print @command
IF @AutoRun=1
EXEC(@command)
FETCH IndexCursor INTO @DatabaseName, @SchemaName, @objectName, @IndexName, @PercentFragmented
END
--SELECT * FROM #IndexStats
END
GO
EXEC sys.sp_MS_marksystemobject sp_NCR_RecreateIndexes
GO
EXEC otis..sp_NCR_RecreateIndexes
EXEC ncrCommon..sp_NCR_RecreateIndexes
GO
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Aug 31, 2015
If I'm doing data compression(page level) does it rebuild indexes too? and how about stats, does it update stats too?
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Apr 24, 2006
I'm using SQL Server 2005 SP1 Standard.
On the Rebuild Index Task there is a checkbox at the bottom that says 'Keep index online while reindexing'.
Great I thought, I'll check that.
Later, when I tested the job, I got this error:
'Online index operations can only be performed in Enterprise edition of SQL Server.'
Why have that checkbox available to check, if I'm running a version that doesn't allow it? Where's the bug?
Thanks
Ed
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Jan 17, 2007
Hi,
We have a client that has a large (5Gb) database replicated to 13 subscribers, the publisher is Sql 2005, the subscribers are Sql Express. The publication has as few filtered articles too. I have found that after several months of continuous running Replication Monitor is taking a long time to report history on each subscriber.
Do people tend to rebuild the indexes on the system merge replication tables on production servers, or should the standard replication jobs take care of this?
Thanks for your help
Graham
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Apr 30, 2008
We are using SQL 1005 Standard Edt, so online Rebuild index is not available. Any way to figure out how much time will it take to rebuild index on given size of database so i can make sure i set schedule for rebuilding index when it is okay not to answer DB traffice during that time.
Thanks,
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Feb 2, 2015
I've been trying to get a definitive answer to this question but alas I have conflicting and patchy answers so far from other sources. I have an index that, lets say, requires 10GB of data space to rebuild..This index resides on a filegroup that spans 2 files on two seperate drives (i.e. a mdf and ndf)
When I rebuild this index how will each of these datafiles grow as the rebuild proceeds to completion? Lets for the time being remove the caveats of any other activity hitting the example index/database in question.My tests seem to show that only the mdf will grows (or the file with the lowest id in the that filegroup) provided there is enough space available in that particular file to complete the operation. The secondary ndf dat file doesnt grow at all if the mdf has enough space.
Is expected behavior? i.e. the index will be rebuilt in a contiguous manner relative to the files contained with the filegroup i.e. fileid 1 will grow till limit reached then next fileid grows etc?
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Jul 1, 2014
I'm working to improve performance on a database I've inherited, and there are several thousand indexes. I've got a list of ones which should definitely exist within the database, and I'm looking to strip out all the others and start fresh, though this list is still quite large (1000 or so).
Is there a way I can remove all the indexes that are not in my list without too much trouble? I.e. without having to manually go through them all individually. The list is currently in a csv file.
I'm looking to either automate the removal of indexes not in the list, or possibly to generate the Create statements for the indexes on the list and simply remove all indexes and then run these statements.
As an aside, when trying to list all indexes in the database, I've found various scripts to do this, but found they all seem to produce differing results. What is the best script to list all indexes?
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Aug 15, 2001
Hi,
how long a rebuildm.exe takes?
TIA
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Feb 13, 2001
Hi!
This is first time I'm using this forum.
I was using SQL Server forum on deja.com before.
Anyway here's the question I have.
We are planning to rebuild the server by reinstalling OS,SQL Server 7.0 and user application.
My question is what's the strategy for restoring sql databases?
Right now all data files plus backups located on this box.
Please advice.
Thank you
Lena
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Nov 26, 2004
Hi,
Maybe a silly question, but... Are DBCC DBREINDEX and sqlmaint -RebldIdx doing exactly the same thing ? I mean, I know they are both rebuilding index, with optionnally precising a new fillfactor, but are they processing this operation by the same way ? If not, which is best ?
Thanks
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Dec 7, 2005
Greetings,While loading data into Sql Server using BCP utility,we have to explicitly need to drop the indexes. then after loading thedata we recreate them. I just want to know if this is possible throughsome other ways. i mean in DB2 we have an option of index rebuildoption which takes care of this job.Do we have anything as such in BCP or is there some other way?Any help will be appreciatedTIA
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May 20, 2008
Hello Folks
We have configured log shipping from prod to standby, and thats working great, but we have a nightly maintenance plan the makes a full backup of the database and rebuilds indexes in the prod DB. This maintenance plan increases log file tremendously.
You guys have any ideas how we can truncate the log file without disturbing log shipping ? I have read rebuilding indexes increases log file a great deal. Any ideas how we can get around this?
Thanks,
G
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Sep 4, 2007
Hey all,
I'm a newbie to SQL, the organization i work for recently had a server experience a multiple hard-drive failure, corrupted the OS, etc etc. We called in a data recovery specialist who used an Ontrack tool to pull the SQL files we could off of the dead server and onto a different server. Question being how do i attempt a restore from disk, and also the Ontrack recovery software created a directory named "LOSTFILE" which contains multiple directories which contain a variety of different filetypes. Has anyone experienced a similar situation? Any ideas how i can get this resolved?
Ultimately i'd like to setup a new server and transfer the recovered files to it.
Any ideas or help is greatly appreciated,
Thanks!
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Nov 22, 2006
I have just spent 2 days trying to rebuild my system databases after a crash.
Each time I issued the start /wait setup.exe etc. command, the task would fail with the error:
MSI (s) (80:10) [12:07:34:815]: Product: Microsoft SQL Server 2005 -- Error 1706. An installation package for the product Microsoft SQL Server 2005 cannot be found. Try the installation again using a valid copy of the installation package 'SqlRun_SQL.msi'.
The initial install of SQL was run from a network share. The rebuild was from CD.
It seems that the original installation source paths are retained in the registry and are not ignored when attempting a rebuild.
Searching the registry for 'SqlRun_SQL.msi' throws up
HKEY_CLASSES_ROOTInstallerProducts812B67BE5CF8FD14F9F1F73F0E443838
and
HKEY_LOCAL_MACHINESOFTWAREClassesInstallerProducts812B67BE5CF8FD14F9F1F73F0E443838
Resolution:
Under the HKEY_CLASSES_ROOT key, change the Sourcelist from network (n) to media (m) and <drive>:ServersSetup instead of the share
Also change MediaPackage under the Media key to ServersSetup
This will automatically amend the HKEY_LOCAL_MACHINE key
This allowed a successful rebuild of the system databases
Bring back Rebuildm!
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Nov 29, 2007
As an effort to rebuild system databases, I ran following command
start/wait C:Setup.exe /qn INSTANCENAME="DEV$SQL02" REINSTALL=SQL_Engine REBUILDDATABASE=1 SAPWD="strongpassword"
I brought setup.exe file from installation cd to c drive of the server. My SQL Server is DEV and SQL Instance is SQL02. While running above command in command prompt (from C: prompt) I have an error masage that said 'setup failed' without any specific cause given for the failure.
I am doing above as part of disaster/recovery procedure in test environment.
Could anyone please shed some lights on what are the steps or what went wrong above while rebuilding master databases.
Thanks a lot
Mike
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Aug 23, 2007
I have a copy of SQL Server Express on a clients computer.
When i try & restart the services it fails with the following error:-
Error: 9003, Severity: 20, State1.
It looks like the master database has become corrupt & needs rebuilding.
I have found a utility rebuildm.exe that repairs the master db but unfortunately it is not supported in sql 2005.
Does anyone have any other suggestions on how to repair the master db.
Thanks.
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Jan 5, 2007
I am having trouble rebuilding the SQL 2005 system databases on my cluster.
The Cluster hardware failed completely and I am recovering from scratch (but only 1 node at this time)
The Win2K3 OS is recovered and communicating with the domain.
Cluster services have started and the quorum is online.
The clustered SQL instance is offline because there is no master.mdf present.
I run the setup command as per BOL:
start /wait setup.exe /qn VS=<VSName> INSTANCENAME=<InstanceName> REINSTALL=SQL_Engine REBUILDDATABASE=1 ADMINPASSWORD=<StrongPassword> SAPWD=<NewStrongPassword> SQLACCOUNT=<domainuser> SQLPASSWORD=<DomainUserPassword> AGTACCOUNT=<domainuser> AGTPASSWORD=<DomainUserPassword>
The Summary.log reports the following:
Machine : CLUSTER1
Product : Microsoft SQL Server 2005
Product Version: 9.00.1399.06
Install : Successful
Log File : C:Program FilesMicrosoft SQL ServerSetup BootstrapLOGFilesSQLSetup0001_CLUSTERSVR1_SQL.log
--------------------------------------------------------------------------------
Setup succeeded with the installation, inspect the log file completely for status on all the components.
However the Microsoft SQL ServerMSSQL.1MSSQLDATA directory is empty. There are no system databases.
Without a rebuilt Master I cannot bring the clustered SQL instance online to then restore my database backups.
Any ideas?
D.
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Jun 17, 2007
I have a client that has a 800GB table. The current clustered index on this table is of low selectivity and is causing index scans on queries. I wish to drop the current index and create a new one that is of more use. What i really want to know is, what is the fastest method of rebuilding such a huge index? What would be the storage requirements to process this?
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Oct 13, 2015
We have 2 clusters, 1 running SQL 2008 on Windows 2008 R2 server and 1 running SQL 2000 on Windows 2003 Server. Because of a disaster with the disks, each of the passive nodes had to be rebuilt and Ive been asked to install SQL on the nodes.
Ive not done this before. Does this mean simply adding a new node to the cluster through the wizard? Or do I need to reinstall the entire cluster?
I think SQL 2000 is too risky as its unsupported, so Im going to resist that. But how should I approach the SQL 2008 Instance?
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