or to reorganize use: ALTER INDEX __NAME_OF_INDEX__ ON __NAME_OF_TABLE__ REORGANIZE. Object: SQLServer:Databases; Counter: Percent Log Used ; Instance: (your big database name) Alert if counter rises above: 80; Response: Execute job ('Reorganize Check') Create a job ('Reorganize Check')The syntax to reorganize a columnstore index is similar to that for a standard B-tree index: 1. Script and result below: ALTER INDEX ALL ON Fragmented REORGANIZE GO1 Answer. In the Select Maintenance Tasks page, select the following tasks: Reorganize. If the index’s design doesn’t allow for that, IndexOptimize will try to rebuild the index online. RCSI utilizes tempdb heavily but gives performance boost. The index reorganize operation will be always performed online. I figured, the reason was because of the page_count, which was lower than 1000 for each of the indexes that were still very fragmented. The below query rebuild or Reorganize only the necessary Indexes instead of all index rebuild, As a general recommendation the index need to rebuild that's get fragment percentage more. Here a Microsoft Engineer states that in most scenarios is not needed, but in the same forum thread I shared my experience step-by-step with images on how you can schedule a database maintenance on Azure SQL. 1. Then you can do an alter index with the rebuild clause whenever your threshold is reached. Over here it will display all the indexes of the table and you can just click OK. This means every time we need to scan the. This method can help when. Indexes with small number of pages (<1000) will usually. For more information, see Specify Fill Factor for an Index. To correct index fragmentation, you can reorganize an index or rebuild an. To reorganize index SQL Server, right-click it & choose Reorganize. They are also configured from SSMS. Near the top of the script, around line 32, you will see a line of Transact-SQL code that looks like this: 1. So, whenever I need to rebuild the indexes of my OrdersItemstable, with some millions of rows, my customers can't create/edit new orders for about 2-4 minutes. It can be done with online option in enterprise edition. You don’t get bonused based on the amount of free space on your drives. Right-click the table on which you want to specify an index's fill factor and select Design. Select “reorganize index” and “rebuild index. x) implemented major performance improvements for these index operations. For more information, see sys. Identifies indexes that are fragmented and defragments them. Step 1. On the right panel, right-click SQL Server Agent. ) Are there open cursors in the database, if so skip the database. This can be checked using:. [CCS-KIDS1] GO. Copy and paste the following example into the query window and click Execute. So your db need to have: data space to accomodate your new index, data space to make a sort since you used SORT_IN_TEMPDB = OFF, and it needs log to be large. DROP INDEX when you are dropping a clustered index offline without specifying the MOVE TO clause and nonclustered indexes do not exist. ALTER INDEX [myIndex] ON [dbo]. I want to rebuild or reorganize indexes in a table. It checks the SQL Server licences, if Enterprise it will rebuild the index online else it. Also, in our nightly database maintenance plan, I have update statistics, reorganize index and rebuild index tasks setup. For general guidance regarding index fragmentation, when fragmentation is between 5% and 30%, reorganize the index. . Hi, The widely used thresholds are: Reorganize if fragmentation is between 10-30%. This is quite a big problem in SQL Server, as your indexes will fragment over time. What works for me may not work for you. SELECT a. There needs to be an automated Index defragmentation job that will either reorganize or rebuild the indexes based on the fragmentation level for a specific table in a specific database. I don't think Windows SQL Server Maintenance has this option yet. I have configured Ola Hallengren's backup and integrity check scripts. SQL Fool (Michelle Ufford) has a great script to do this for you - all done and well tested by many users. Index Reorganize During Database Full Backup. SQL Server doesn’t automatically correct index fragmentation problems. If the tables get more than 15% fragmented, performance is very negatively affected. If not specified otherwise, the procedure uses the fill factor that is already set for each index. The answer is: it depends. Fragmentation causes issues where it takes SQL Server more time to traverse the index tree to find the necessary records. The SQL Server Maintenance Solution lets you intelligently rebuild or reorganize only the indexes that are fragmented. You cannot say, “If the index is 45% or more fragmented, rebuild it– otherwise do nothing. If there are frequent changes to the full-text catalog, use this. dm_os_wait_stats DMV, you will find 21 new wait types related to the SQL Server 2014 Lock Priorities. Er…. The link points to SQL Server 2014 docs, but the syntax should work on 2005 and 2008 as well. set @SQL = 'alter index ' + QuoteName ( @IndexName ) + ' on ' + QuoteName ( @TableName ) + ' rebuild';. Select Allow online DML processing, and then select True from the list. The Microsoft Docs page for SQL Server statistics states: Operations such as rebuilding, defragmenting, or reorganizing an index do not change the distribution of data. 3. Test all three and see which is fastest and which gives the least index fragmentation. I was going to take a look at Ola Hallengren's scripts and some other stuff but wanted to see if there was possibly a simple explanation for this. You can apply a new fillfactor when you rebuild an index. Reorganizing an Index should be done when you have elevated amounts of white space within your index (i. . This could be further tweaked to handle only indexes that need maintenance based on fragmentation levels as well as then doing either an index reorg or an index rebuild. On the Table Designer menu, click Indexes/Keys. The. In this article, we will go through these new. The performance benefit may not be noticeable for indexes that are used primarily for seek operations. You will often see advice to perform a REBUILD on highly-fragmented indexes, rather than a REORGANIZE-- This is because rebuilding from scratch can be more efficient. Defining "Index Stats Options" as well has become available in SSMS. However I want advice whether it is required to setup the SQL Server Index and Statistics Maintenance scripts, because my SQL server is running on a SAN infrastructure and I have read that there is no benefit to setting fill-factor to less than 100%, or to perform index. If you look into the sys. All indexes will be inserted to, updated to, or deleted from for every respective DML statement. It is used when the operation takes a. The difference is easily visible. I'm currently using the approach described here: sys. From Rebuild or Reorganize: SQL Server Index Maintenance by Kendra Little: Short version: Rebuild: An index ‘rebuild’ creates a fresh, sparkling new structure for the index. Someone else set it up. The alternative for online rebuilding is to create a new index using CREATE INDEX CONCURRENTLY, then drop the old. USE AdventureWorks2022; GO -- The following example updates the statistics for all indexes on the. To add to this, you need to learn your system and how it's used. Columns with text, image, ntext, varchar (max), nvarchar (max) and varbinary (max) cannot be used in the index key columns. For more information, see CREATE INDEX (Transact-SQL). If not specified otherwise, the procedure uses the fill factor that is already set for each index. Unfortunately I didn't try the reorganize between the above 2 troubleshooting steps, so I am not sure which one did the trick, but i am leaning towards the PK. ALTER INDEX __NAME_OF_INDEX__ ON __NAME_OF_TABLE__ REBUILD. To correct index fragmentation, you can reorganize an index or rebuild an. " failed with the following error: "Transaction (Process ID 94) was deadlocked on lock resources with another process and has. 1. 5) Perform full database backup. Click Next, and you can define the Update Statistics task. ) Index Size is greater than 5 MB's. If the index creation is interrupted, the index isn't re-created. The “Reorganize” index option is more facilitated than the “Rebuilt” index. Therefore, you do not need to update statistics after performing ALTER INDEX REBUILD, DBCC DBREINDEX, DBCC INDEXDEFRAG, or ALTER INDEX REORGANIZE operations. In the infrequent cases where you do need to reorganize or re-build index, consider these: Run index maintenance during off peak period. Reorganizing an index is always an online operation, and it can be stopped at any time. Also, some tables/indexes will hardly be fragmented. It is causing other queries to wait, even simple ones like: SELECT * FROM tableName WHERE indexedColumn = @value. If an index is between 10% and 30% fragmented, I will REORGANIZE the index and UPDATE the statistics. 2. I'm just using the reorg index task that is in the maintenance plan designer GUI. we have 5 databases in our instance, in that 2 databases are online and remaining are in offline. Large object data is data with the image, text, ntext, varchar (max), nvarchar (max), varbinary (max), or xml data type. 4) Move database back to full recovery mode. Here is the image for additional clarity. In Object Explorer, connect to an instance of Database Engine. The more the fragmentation you need to rebuild if its less you can reorganize. If the index’s design doesn’t allow for that, IndexOptimize will try to rebuild the index online. The Reorganize Index task also includes an option to compact large object data. USE AdventureWorks; GO ALTER INDEX ALL ON Production. Hi, The widely used thresholds are: Reorganize if fragmentation is between 10-30%. Select the Update Statistics maintenance task from the list of tasks. You can safely stop it but you need to find out why your database became slow. He has the best practices coded into his scripts, so it should serve you well. Click OK. Is this possible to do? In earlier versions of Microsoft SQL Server it could cause system slowdown to reorganize or rebuild a large index. When you rebuild indexes Offline, the operation acquires a Schema modification (Sch-M) lock on the table. The first item is "Reorganize data and index pages". If an index contains less than 100 pages, I will perform no maintenance. Reorganize does not holds blocking locks. I suggest 50% for REORGANIZE, 80% or even 90% for REBUILD. I have this piece of code which helps me rebuild indexes if they are fragmented to a certain percentage. May be index was not there, may be you were just rebuilding the index. There are two main ways to defragment a Heap Table: Create a Clustered Index and then drop it. -- for SQL Server 2008 and up SELECT OBJECT_NAME([table_id]) AS TableName, COUNT([fragment_id]) AS Fragments FROM sys. Rebuilds are generally faster. Your disk drive space is for files, not for ornamentation. Depending on the type of index and database engine version, a rebuild operation can be done online or offline. This script detects indexes for rebuilding using these rules: Rebuild the index when these conditions are true: - deleted entries represent 20% or more of the current entries. Coming to update stats, I would prefer to do it with Full Scan depending on the size of the databases. My predecessor created a Maintenance Plan with 4 tasks: CHECKDB; SHRINKDATABASE (N'DB1',10,TRUNCATEONLY); it seems to be running a REORGANIZE on all Indexes for all Tables and Views and "Compact Large Objects" is checked; and then it UPDATE. You can also change this threshold via parameters. You can do maintenance in phases, where each maintenance phase covers a subset of. That's why as a rule of thumb, for fragmentation greater than about 30%. It is compatible with all versions of SQL Server 2005 , 2008 , 2012 , 2014 and 2016. Reorganize: Reorganize indexes with between 11-30 percent fragmentation. INDEX_REORGANIZE Reorganizes the index. I used the sp_who2 procedure to see which queries were waiting, and which other query they were blocked by. This sample T-SQL script performs basic maintenance tasks on SUSDB 1. Hi, Added an index maintenance job (Hallengren) to a database (SQL Server 2016) with a few large tables. Change it to be weekly or even less frequently. 4. we are using Ola index job to rebuild and reorganize the index. 3,895 9 51 77. less than 30% fragmentation), it’s generally faster to reorganize the index, but for a more heavily fragmented index, it’s generally faster to just. Right-click Maintenance Plan and select Execute. SQL Server ALTER INDEX Syntax. Check out my Pluralsight course on fragmentation or read. Also, in earlier versions the granularity of control was less refined. regarding reorganize - there is an exception to this - if you have columnstore indexes that are frequently subject to deletions or that are subject on inserts in small batches then running reorg. However, my SQL Server license is Standard and I can't rebuild indexes online. Note: You can select “Reorganize All” to reorganize all the indexes in the table. In this article. SQL 2012, massive bulk insert into “daily” (heap) table with PAGE compression (~100 GB, ~600 mio rows), create the nonclustered columnstore index (no other indexes on the table), partition switch into main (heap) table. Hi Team, Today when I go through some of the SQL Server performance videos, found one interesting video (Please find the link below), where he said that rebuilding indexes is a very expensive thing and it will clear the cache every time an index rebuild happens, (It means that we indirectly killing the SQL Server everything we rebuild. REORG INDEXES/INDEXES command reorganizes indexes. 10/28/2022. This would also keep the original order of columns. This index always show 100% avg_fragmentation_in_percent, index level 2, pages =8. We need to set these parameters for the job IndexOptimize - USER_DATABASES: @UpdateStatistics = 'ALL'. It was trying to do so because when Index is REBUILT (with. Right-click the table on which you want to specify an index's fill factor and select Design. To create a new job, right click on SQL Server Agent, select New and then Job. This means long-term object-level locks are not held and queries or updates to the underlying table can continue during the ALTER INDEX. Create an agent WMI alert ('Reorganize Relief Valve') on a performance condition. Method 1: Create a SQL Server Agent job to rebuild indexes and update statistics. When fragmentation is above 30%, rebuild the index. Basically, an index rebuild copies the index to another place. FileID, a. Rebuild or Reorganize indexes Ask Question Asked 1 year, 1 month ago Modified 1 year, 1 month ago Viewed 1k times 0 I want to reorganize or rebuild indexes. You can read more on rebuilding indexes here . before i answer your question is the database on simple recovery. If the index’s design or your SQL Server edition doesn’t allow for that, it’ll perform the last resort – an offline index rebuild. Please refer to SQL Server Maintenance Plan Reorganize Index and Update Statistics Tasks to get more information about how to design the maintenance plan. 2. One of the biggest performance hits that you will see on your databases, next to not having indexes, is indexes that are very fragmented. Also, running UPDATE STATISTICS gets you both index and columns stats updates. The script will do a reorg if fragmentation goes over 5 %. I know the sql to perform this action on all indexes in a table is. It’s advisable to remove those often. For instance, in the Maintenance Plans of SQL Server 2017, it is possible to rebuild only those indexes where fragmentation level is higher than a specific percentage and has more pages than specified in "Page Count". The documentation for alter index, for example, shows that it accepts an index_name, not an expression that might evaluate to an index name. The REINDEX command requires an exclusive table lock, which means that it'll stall any accesses to the table until the command has completed. Use ALTER INDEX REORGANIZE, the replacement for DBCC INDEXDEFRAG, to reorder the leaf level pages of the index in a logical order. The Microsoft Docs page for SQL Server statistics states: Operations such as rebuilding, defragmenting, or reorganizing an index do not change the distribution of data. You can do maintenance in phases, where each maintenance phase covers a subset of. Index rebuilding process uses more CPU and it locks the database resources. Similarly, removing fragmentation in a. Add a comment. Coming to the point out of all there is a database with 51Gb, yes we have seen some big tables majorly occupying space in db. Click the plus sign to expand the Tables folder. The fully qualified name or alias in the form: schema. Rename. As of this writing, our super smart SQL Architect and Performance Expert (Jeff Schwartz) is working on some testing to see if there is any measurable overhead to all the misleading out-of-space messages generated during index REORGANIZE maintenance. 1) Since its indexes are not reorganized before. 2 contributors. I'm just using the reorg index task that is in the maintenance plan designer GUI. sql script from Ola’s website and open it up in a query window inside of SSMS. To work around this, try the following methods: Method 1 ( recommended ): Limit the number of full-text indexes in the same catalog. Index Rebuild : This process drops the existing Index and Recreates the index. This job needs to be scheduled and ran on a weekly basis due to large data. We leave default values here as well. ;WITH cte AS ( SELECT object_id, index_id, partition_number, rows, ROW_NUMBER () OVER (PARTITION BY object_id, index_id, partition_number. The job is scheduled to run daily at 5 am and fails once or twice per week. dm_db_index_physical_stats DMV). We would like to show you a description here but the site won’t allow us. From all the research I've done, I can't really find any indication of why you would want page fullness to be low, and am anticipating that I'll want to do an index reorganize operation to set the value to. Before using it, note that “Rebuild” and “Reorganize” are two different operations, even though they both reduce fragmentation in the index. Tablename rebuild with (online=on) on. However, the meaning of those operations is different in the case of Columnstore. Rebuilding an index means that a whole new set of pages is allocated for it. As well as maintenance plans, SQL Server Agent jobs are also a handy way to automate and schedule index defragmentation jobs in SQL Server. Someone else set it up. ALTER INDEX ALL ON [table_name] REORGANIZE; However, if you want to rebuild all the indexes on the table, you can run the following command. Frequency of the maintenance should be considered with the goal of minimizing impact of log generation. @OnlyModifiedStatistics = 'Y'. If you don’t spend much time with SQL Server and you. The following index operations require no additional disk space: ALTER INDEX REORGANIZE; however, log space is required. For example, the heaviest index (clustered index and also pk) is running reorg for around 4 hours 30 min even do the index was. #1637994. In this article. do nothing; reorganize an index; rebuild an index; Don't reinvent the wheel - just go see and use the script!Effective database performance tuning often relies on having precise database insights to determine actual root causes. You need to assemble the SQL prior to calling SP_ExecuteSQL, i. [Product] SET ( ALLOW_PAGE_LOCKS = ON ) ALTER INDEX [PK_Product] ON [Production]. e. Mar 8, 2021, 2:47 PM. The detailed information can also be useful to determine whether your dedicated SQL pool is being impacted by a large number of small, fragmented tables, which can lead to delays in compilation. As tables grow and shrink, this fragmentation can ultimately play a role in how well SQL runs. Shrinking with data movement (without TRUNCATEONLY) will fragment your indexes. indexesのindex_id）または1、0、-1、-2のいずれか指定できます。 -1は、テーブルに関連するすべてのタイプのページ（行内データ、ローオーバーフローデータ、IAM、すべてのインデックス）についての完全な. The reason given is that the indexes and statistics are partly based on available CPU and memory resources. Use Ola Hallengren ‘s IndexOptimize but don’t use his defaults. We have decided to use the following code to compute a fragmentation % for each full-text index. name AS IndexName, indexstats. This opens the Full-text. Designing efficient indexes is paramount to achieving good database and. x), REORGANIZE is only used to compress CLOSED rowgroups into the columnstore. The T-SQL script in this article can be run by SQL Server administrators to reindex and defragment WSUS databases. Reorganizing an index only deals with the fragmentation that exists, and the more fragmentation there is, the longer a reorganize will take. Does database on which tables reside have database owner. I don't remember if IDENTITY INSERT ON will help. Each night the maintenance plan is successful, but these commands take the longest to execute 3 hours, 3 hours and 5 hours respectivelly. Specifies the table to reorganize. Right-click on the index and select Rebuild. deteriorating. If you are using Windows Internal Database, you will need to use the sqlcmd utility, which can be. So far, all good. Specify the name of the maintenance plan. The rebuild command will defragment all those intermediate pages. And also seen fragmentation for most of the tables in it hence initially created a reorganize index maintenance plan and executed but it is being run for the last two days. Below the last two rows that displays the fail: Source: Reorganize Index Executing query "ALTER INDEX [PK_xxTableName] O. Setup a new job to run update stats via IndexOptimize daily. I have been advised by a contracted SQL Server expert that, after any change in # of CPUs and/or available memory, I should reorganize all indexes and then update all statistics or SQL Server will not make the full use of the new resources. Best regards, Carrin Cancelling / Stopping ALTER INDEX REORGANIZE. line is helpful to give the user some indication of what indexes it is rebuilding and how far it has progressed. Create a job to run your index reorganize ('Reorganize'). You can also see if a reorganize will help until you can do a full rebuild. The only. Right-click the index that you want to rebuild online and select Properties. before i answer your question is the database on simple recovery. Resolution: Reorganize and rebuild indexes. Categorize fragmentation percentage – Microsoft suggests that we. To solve this, I want to use the REORGANIZE operation every time. Fragmentation. Same with updating the stats first and then rebuilding. In Object Explorer, Expand the database that contains the table on which you want to reorganize an index. H. If a nonclustered index is being rebuilt, a shared lock is held on the table in question during the operation. 7. These are two different modes to remove index fragmentation. Rebuilding an index means that a whole new set of pages is allocated for it. It drops index entirely and creates it from scratch. ALTER INDEX [PK_SalesOrderDetailEnlarged_SalesOrderID_SalesOrderDetailID] ON [Sales]. It also enables faster growth in the future. When I ran the query again, this was the result: Fragmentation over 70% for 12 indexes, over 30% for 15 indexes. 000. There's a general consensus that you should reorganize ("defragment") your indices as soon as index fragmentation reaches more than 5 (sometimes 10%), and you should. Frequency of the maintenance should be considered with the goal of minimizing impact of log generation. Feedback. 1. You can use WAIT_AT_LOW_PRIORITY time keyword along with online rebuild process and it will automatically abort the rebuilding process for. Clustered Columnstore Indexes, as well as “regular” indexes, support the Rebuild and Reorganize operations. In the IndexOptimize procedure, you can define a preferred index maintenance operation for each fragmentation group. First, we will start the index reorganization in a session using the following T-SQL code. But if you want your script to work you would have to go to index right click select properties and enable row level locking for reorganize to work this is the only optionALTER INDEX REBUILD on an truncated and therefore empty table serves no purpose, so you need to amend your Plan A. Fair enough, but let’s make some adjustments. Values: - 0: The script will reorganize or rebuild the fragmented indexes. Speaking for SQL Server, I tend to choose a index size and index fragmentation level at which point I begin performing index maintenance. x), you can create nonclustered B-tree or rowstore indexes as secondary indexes on a clustered columnstore index. OBJECT_ID) AS TableName, ind. Regards. Use the online version of the Rebuild Index task ; Use the Reorganize Index task followed by the Update Statistics task; If you have the Enterprise Edition of SQL Server, the Maintenance Plan Wizard offers a Keep index online while reindexing option, which means that the index will continue to be available to users even while it is being. As visible in the above image, REBUILD and REORGANIZE are the two available choices to play out the trim operation over the page. IndexOptimize provided by Ola Hallengren. In SQL Server, you "might" run into issues with "updating primary key". 2. Summary: SharePoint Server uses SQL Server to store most of the content for the Web site and configuration settings. On a data partitioned table, you can reorganize a specific nonpartitioned index on a partitioned table, or you can reorganize all the partitioned indexes on a. Using SQL Server Management Studio: In the Object Explorer pane navigate to and expand the SQL Server, and then the Databases node Expand the specific database with fragmented index Expand the. 21 Code: 0xC0024104 Source: Reorganize Index Task Description: The Execute method on. In my last tip, Index Fragmentation Report in SQL Server 2005 & 2008, I discussed what fragmentation is, its different types, its performance impact and what are different methods available in SQL Server 2005 and 2008 to identify fragmentation levels. For more information, see ALTER INDEX (Transact-SQL). Best regards,. Coming to update stats, I would prefer to do it with Full Scan depending on the size of the databases. SQL Server index fragmentation is unavoidable, but you can minimize the negative effects of fragmentation on database performance. I think there is another way to rebuild fragmented index, You can create an sp and scheduled it via SQL Server Agent or via task scheduler. It’s an unbelievably, disgustingly, repulsively bad idea. In the official SQL Server documentation, Microsoft advises about the best method for removing index fragmentation in SQL Server as per below: When you have an index. –In this article. According to Microsoft’s best practices, it is recommended to reorganize indexes if their fragmentation level is >15% and <=30% (if >30%, a rebuild should be done). Here are a couple of examples. If the clustered index is being rebuilt, an exclusive table lock is held. [Subscribers] REBUILD; You can replace REBUILD with REORGANIZE in the above query to. Let us create a Heap Table and insert some records in it and then check the fragmentation. We are planning to run index rebuild/reorganize on a regular basis in our application. Provide a name for your maintenance plan and click Next to choose the tasks we want to include in our maintenance plan. If you what you are saying is true, even reorganizing the indexes that have never been, may cause a larger impact on the server as well. 3 and a half hours later, it's not finished. The documentation is also indicating that: Online index operations are not available in every SQL Server edition. Right-click the table on which the full-text index is defined, select Full-Text index, and on the Full-Text index context menu, select Properties. If a nonclustered index is being rebuilt, a shared lock is held on the table in question during the operation. Technically, rebuilding consists of copying, renaming, and dropping the old one, internally. To fix the fragmentation either rebuild or reorganize the index on the table. Using SQL Server Management Studio: In the Object Explorer pane navigate to and expand the SQL Server, and then the Databases node Expand the specific database with fragmented index Expand the Tables node, and the table with fragmented index Expand the specific table Expand the Indexes node. This operation checks the index, and if there is a need, it fixes the physical ordering of pages. DROP INDEX when you are dropping a clustered index offline without specifying the MOVE TO clause and nonclustered indexes do not exist. FullTextIndexOptimize. Use the ALTER TABLE command to rebuild the Heap. 1. Reorganize Doesn`t Create A New Index It is again a short demo which shows that Reorganize doesn`t create a new Index, In this demo we will reorganize the index and we will check does the Index ObjectID and PageIDs changed in comparewith the last demo. Mohamad Mahmoud Darwish. Index rebuilding and reorganizing are the two methods to maintain indexes and improve database performance. The following index operations require no additional disk space: ALTER INDEX REORGANIZE; however, log space is required. Product REORGANIZE GO. The syntax for rebuilding indexes is very simple, we just add the "WITH ONLINE=ON" clause to the ALTER INDEX command. Next time it runs slow, check out how fragmented the clustered and non clustered indexes are, and also check to see if you have AUTO_UPDATE Stats enabled!I would suggest that you use Ola Hallengren's scripts, freely available and widely used. If you want to try : I would like you to use READ_COMMITTED_SNAPSHOT isolation level for this operation and see if you succeed. Online rebuilds are online available on the Enterprise version of SQL Server and your version probably isn't, so just set the operation not to be run "Online" on you Wizard. REORGANIZE operation. As with a B-tree index, the rebuild will create a brand new columnstore index from the underlying data. avg_fragmentation_in_percent FROM sys. @databaseToCheck (optional) Values: - NULL: It will scan all databases with compatibility level SQL Server 2005 (90) or later for fragmented indexes. Use the online version of the Rebuild Index task ; Use the Reorganize Index task followed by the Update Statistics task; If you have the Enterprise Edition of SQL Server, the Maintenance Plan Wizard offers a Keep index online while reindexing option, which means that the index will continue to be available to users even while it is being.