Online Rebuild Index Table Lock

May 27, 2008

I have a very large table with approximately 400 million records in it. Every 10 seconds approximately 150 insert are done on the table. I am attempting to rebuild one of the indexes (non-unique, non-clustered). But when I run a script to rebuild the index online (i have enterprise edition) the VB.NET service that is attempting to insert generates SQL timeout errors (timeout set to 30 seconds). From an article on msdn they state that long term table locks are not held for the duration of the index operation. So what am I missing because I am not close to being a DBA. I know SQL Server is not a SCADA but it is not my choice.

Here is the script for one of the rebuilds
USE [DATABASENAME]
GO
ALTER INDEX [IX_REALLY_BIG_TABLE_DT]
ON [dbo].[REALLY_BIG_TABLE] REBUILD
WITH ( PAD_INDEX = OFF,
STATISTICS_NORECOMPUTE = OFF,
ALLOW_ROW_LOCKS = OFF,
ALLOW_PAGE_LOCKS = ON,
SORT_IN_TEMPDB = OFF,
ONLINE = ON )
GO



Here is the article
http://msdn.microsoft.com/en-us/library/ms188388.aspx

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Rebuild Index Task - Online Only?

Jun 19, 2008

Hi all,

In SQL Server 2005 EE I created a maintenance plan to rebuild indexes for a few large tables. I have selected five specific tables, and I'm using both "sort results in tempdb" as well as "keep index online while reindexing".

If I execute this plan for all these tables, are the indexes guaranteed to remain online? There are all different types of indexes on these tables. For example, the table "Contacts" has 8 indexes: 1 Clustered, 1 PK Unique Non-Clustered, 2 Unique Non-Clustered, and 4 Non-Unique Non-Clustered. I've heard that only certain types of indexes can remain online during a reindex (Clustered and Non-Unique Non-Clustered??).

Will SQL Server rebuild an index that isn't compatible with the online reindex mode, or will it choose to ignore it?

Thanks,

- Matt

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Jan 25, 2008

Table A
5.6GB
80 million rows
Initial Page Space Used = 85.7% (sys.dm_db_index_physical_stats - avg_page_space_used_in_percent)

Index and data size are almost unchanged after an ONLINE rebuild of the clustered index. Page count actually goes up by 800. No fill factor or pad index settings. Page space used = 99.2%

During an OFFLINE rebuild the page count drops by ~20%. Page space used = 99.8%.

How can the pages be 99.2% used yet the number of pages hasn't gone done from the ONLINE rebuild?

I'm getting the feeling a shortcut was taken somewhere. Does an ONLINE rebuild only reorganize leaf level index pages but not any of the upper levels? Essentially it puts the pages in order but doesn't do any structure consolidation like OFFLINE?

It would seem that you're missing out on some of the benefits of defragmenting if your data is still spread across more pages and you don't get as many rows per read or it takes more reads to go down your tree to get to your data.

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The act of adding and dropping 14 bytes would cause fragmentation and uncompressed data. Is this correct or do I have something wrong?

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Dec 12, 2006

Hi ..

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Nov 4, 2015

We use below OLA script to do our index maintenance and one of our previous engineer designed below script on web edition and I have a question of how online index rebuild works when we have web edition. Does the online Index rebuild really works? I am thinking it only reorganizes and does not do online index rebuild.

sqlcmd -E -S $(ESCAPE_SQUOTE(SRVR)) -d master -Q "
EXECUTE [dbo].[IndexOptimize] @Databases = 'DBName1',
@FragmentationLow = NULL,
@FragmentationMedium = 'INDEX_REORGANIZE,INDEX_REBUILD_ONLINE',
@FragmentationHigh = 'INDEX_REORGANIZE,INDEX_REBUILD_ONLINE',
@FragmentationLevel1 = 5,
@FragmentationLevel2 = 30,
@LogToTable = 'Y'" -b

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Jan 17, 2008

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Jun 3, 2014

I was under impression that rebuilding index online largely means that the index will remain available for use during rebuild and my procs and query will be able to use it during rebuild. Also my understanding was that table will be locked very briefly while the schema change will be completing.But when I was rebuilding the clustered index online on a large table with some 3 million records, the table got locked and I was not able even to read the data from it for some 5 minutes. Then I cancelled the operation as it was production server and it was one of our main transaction table.

Is rebuilding index online supposed to work this way? The table has no other index.The parameteres I used are:

REBUILD WITH (PAD_INDEX = ON, SORT_IN_TEMPDB = ON, ONLINE = ON, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, FILLFACTOR = 95)

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my question,
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2. How do I impose time limitation?

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Running SQL 7.0 SP3 on P3 dual 800.

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I have no idea why it would take so long. Nothing changed, there were no new indexes created and none deleted.

Any ideas? I have to find out why. My boss wants an answer.

Thanks in advance.
Kelsey

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Hi All,

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Thanks.

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Jan 15, 2008

Rebuild Index job for user db's is failing, one user db is a huge size 120 GB. The job scheduled to run every sunday 1 AM

I found the below error in log report

Rebuild Index Task (server name)
Rebuild index on Local server connection
Databases: All user databases
Object: Tables and views
Original amount of free space
Task start: 01/13/2008 1:26 AM.
Task end: 01/13/2008 2:38 AM.
Failed-1073548784) Executing the query "ALTER INDEX [Idx_CISCO_WLC_EVENTID] ON [dbo].[CISCO_WLC_200711262137] REBUILD WITH ( PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, SORT_IN_TEMPDB = OFF, ONLINE = OFF )
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Please let me know the solution?

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Hi all...

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If the index to be rebuilt is a clustered index, will all non-clustered indexes be rebuilt also by rebuilding only the clustered index.

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Thanks for any feedback.

Dinakar Nethi
SQL Server MVP
************************
Life is short. Enjoy it.
************************
http://weblogs.sqlteam.com/dinakar/

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Thanks and God Bless,
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ThomBeaux

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Sep 20, 2007



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Nov 6, 2007



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Jan 18, 2008

assuming that i don't have a problem that rebuilding the index take more CPU and locks the database resources.

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Jul 25, 2007

I need to establish the storage requirements for a clustered index rebuild with SQL 05. The table is made up of the following columns



[ProductID] [int] NOT NULL,

[RegionID] [int] NOT NULL,

[TimeID] [int] NOT NULL,

[FactID] [int] NOT NULL,

[Value] [decimal](14, 4) NOT NULL



This is the clustered index :-



[RegionId] ASC,

[FactId] ASC,

[TimeId] ASC,

[ProductId] ASC



This is the result of a sp_spaceused on this particular table














name
rows
reserved
data
index_size
unused

Table
16910379278
868107368 KB
863579184 KB
3869848 KB
658336 KB



The database where this table is stored is in Simple recovery mode.



What i would really like to know is, what additional storage would i require to run the following rebuild index command.



Alter Index blah on table Rebuild



Thanks





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Thanks very much.

Tracy Hughes
thughes@neonsoft.com
office 303-805-5693

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Dec 4, 2007

SQL Server 2005 version: 2153
I created a maintplan for system and user databases includes rebuild index, maint cleanup tasks.

Job is failing for user databases
It includes rebuild index task( online index enabled) and maintenance cleanup task, scheduled at every sunday 1 AM.


I receive following errors:

In eventvwr log

sql server scheduled job 'DBMP_RebuildIndex_User'
status: failed-Invoked on 2007-12-02 -1:00 Message: The job failed. The job was invoked by schedule 8 ('DBMP_RebuildIndex_User-Schedule).The last step to run was step1 ('DBMP_RebuildIndex_User')[/red]

In log report:

Failed:(-1073548784) Excuting the query "ALTER INDEX [XPKact_log] ON
[dbo].[act log] REBUILD WITH (PAD_INDEX=OFF,
STATISTICS_NORECOMPUTE=OFF,ALLOW_ROW_LOCKS=ON,ALLOW_PAGE_LOCKS=ON,SORT_IN_TEMPDB=OFF,ONLINE=ON)
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Please anyone help me on this?
I really appriciate

Thnks

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Jun 9, 2006

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Jun 19, 2006

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