You might ask why you should do this yourself, since this is what the tuple-mover. WITH FULLSCAN Are there any advantages or disadvantages to using "UPDATE STATISTICS (Index name)" as opposed to "ALTER INDEX (index name) ON. For example, one of the indexes with a page_count of 967 has a fragmentation percentage of 98,98%! To me, it seems worth rebuilding that index! I did, and afterwards, the fragmentation was 0%. Syntax ALTER INDEX index_name ON table_name. Clean Up History. RESUMABLE = ON means you can. DROP INDEX when. The rebuild can be resumed later after the previously completed partition number. Please refer to SQL Server Maintenance Plan Reorganize Index and Update Statistics Tasks to get more information about how to design the maintenance plan. 6. Use the ReorganizeIndex Task dialog to move index pages into a more efficient search order. But your index will also use more space. You can also see if a reorganize will help until you can do a full rebuild. 3. The link points to SQL Server 2014 docs, but the syntax should work on 2005 and 2008 as well. SQL Server development version and Enterprise version has option ONLINE, which can be turned on when Index. From sys. ALTER INDEX [PK_SalesOrderDetailEnlarged_SalesOrderID_SalesOrderDetailID] ON [Sales]. before i answer your question is the database on simple recovery. [myTable] REORGANIZE WITH ( LOB_COMPACTION = ON ) I have the above query running for 16 days (still running), the table is a dummy table used for benchmark tests, it has over 10 Billion rows. 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. Rebuild or reindex ?? good question ! Analysis indexes defragmentation RATIO and decide to REORGANIZE OR REBUILD. Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW) Poorly designed indexes and a lack of indexes are primary sources of database application bottlenecks. If you don't want to grant so granular. Quick explanation: An online Rebuild, rebuilds the indexes on the tempDB making it available to the queries while it is being rebuilt. They are also configured from SSMS. @LeeWalters shrink is done, and yes, due to disk issues, not possible to add drives, that's why, in addition, db is populated with blob data, so the question is more from the index fragmentation side. The MAXDOP index option cannot be specified in the ALTER INDEX REORGANIZE statement. ” Select the vault database(s). Yup, that is one perfectly valid way. UPDATEIn this article. If not specified otherwise, the procedure uses the fill factor that is already set for each index. The indexes that cannot be rebuild online are: Disabled clustered index ; Disabled indexed view1. Modifying a SQL Server Maintenance Plan. Defragmentation in Practice. When you rebuild, SQL creates a new fresh index. the year and month columns. When you reorganize the index, you go through the existing index, cleaning up blocks for deleted records etc. Bad internal fragmentation (having lots of free space on the pages) means the index is bigger than it needs to be. We will use 3 statements in order to show the blocking: ALTER INDEX. SQL Server 2019 adds resumable online index creation, and it’s pretty spiffy: 1. Product REBUILD GO Index Reorganize : This process physically reorganizes the leaf nodes of. A developer coming onto a project with out of date tools is a common cause of this. 8. Rebuilding indexes only does the index itself so the column stats are stale unless they hit the "20% data change + 500 records" criteria to trigger the auto-update. From this tab, select a SQL Server instance in the server explorer on the left and choose database (s) as a target of index operation. Quote from "Microsoft SQL Server 2000 Index Defragmentation Best Practices": "Fragmentation affects disk I/O. Depending on how many rows actually fit on the page, your mileage may vary. dm_db_index_physical_stats ‘ Dynamic Management View (DMV). An index rebuild operation cannot be interrupted without it rolling back everything it’s done so far – it’s atomic – all or nothing. We will use 3 statements in order to show the blocking: ALTER INDEX. There are two ways to set fillfactor in SQL Server: At the SQL Server instance level using a sys. For the data (clustered index and heap) you'd have to export outside SQL Server, truncate the table, shrink and then import the data. Product REORGANIZE GO. Reorganize Index Log Generation Now here is the final demo of Reorganize the Index, it generates lots of Transaction Log records, a very simple demo, we will capture transaction log using sys. Reorganizing or rebuilding a cluster index does not have any impact on the non-cluster indexes in SQL Server 2000 SP4 or above, or any version of SQL 2005 or. When using columnstore indexes, the delta store may end up with multiple small row groups after inserting, updating, and. A REORGANIZE physically reorders the leaf-level pages to match the logical order of the leaf nodes, whereas a REBUILD does just that, it rebuilds the index. Many people (and even solutions) in the SQL Server community say you need to look at Index Fragmentation levels (e. It eventually makes a Job in your server agent and then you can set a schedule or run the job manually by running this script. ALTER DATABASEdb_name SETREAD_COMMITTED_SNAPSHOT ON go Alter index Index_name on table_name. You should always do some form of intelligent rebuilding - i. Index Rebuild operation first drops and then recreates the index. Rebuild or Reorganize SQL Index. 1 Answer. Online & Offline Index Rebuild. After an index reorganize, yes, for all statistics as none of them are updated by the. Larger indexes have more intermediate levels and pages. Is this possible to do? Creating a SQL Server Maintenance Plan. Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW) Columnstore indexes are the standard for storing and querying large data warehousing fact tables. This makes it more likely that some other session is blocked by your session, and that you may, in turn, become blocked by a lock held by that session. We want to create an index. The second part of this tip is intended to reduce the duration for update statistics as it pertains to both. In SQL Server, you "might" run into issues with "updating primary key". Rebuilding an index does two things. It doesn’t work on the intermediate pages between the root and the leaf. It’s advisable to remove those often. It's better to do reorg on Nightly basis and Rebuild during the weekends. SQL Server 2005 Index Rebuild/Reorganize. Specify the name of the maintenance plan. Solution. – Ed B. . When you double click on this task the following screen appears. Microsoft recommends Index Rebuild operation to defrag indexes if the fragmentation level of your index is greater. Yes, just the table and any query that tries to access that table. The query causing the block is in the format: ALTER INDEX [indexName] ON tableName REORGANIZE. If an index is between 10% and 30% fragmented, I will REORGANIZE the index and UPDATE the statistics. Ini tidak berlaku untuk indeks penyimpan kolom atau penyimpanan data dalam memori. > 5% and < = 30% ALTER INDEX REORGANIZE. I don't think Windows SQL Server Maintenance has this option yet. Script to reorganize all indexes on all tables in user databases. NAME 'Index name', ips. Larger indexes have more intermediate levels and pages. We will use 3 statements in order to show the blocking: ALTER INDEX. When you. You have two maintenance commands for indexes: Reorganize. Bug in Rebuild on SQL Server 2016 and above? 6. To fix the fragmentation either rebuild or reorganize the index on the table. This operation is always online, uses minimal system resources, honors the fill factor that has been used during the creation of the index (common misconception is that reorganize operation does not take into account. Therefore, it'll appear as if there is still fragmentation remaining, as the housing extent will contain pages from multiple indexes. 000 rows. For a turnkey solution, you may refer to Microsoft MVP Ola Hallengren's SQL Server Index and Statistics Maintenance. Expand the Indexes. If there are frequent changes to the full-text catalog, use this. The documentation for alter index, for example, shows that it accepts an index_name, not an expression that might evaluate to an index name. line is helpful to give the user some indication of what indexes it is rebuilding and how far it has progressed. DBCC DBREINDEX rebuilds an index for a table or all indexes defined for a table. dm_tran_database_transactions DMV:This offline index rebuild could be done at the table or the partition level. These pages can get empty space on them and become out of order over time as well. A clustered index exists, along with 3 non-clustered indexes. In the previous SQL Server versions, using the Rebuild Index and Reorganize Index Maintenance Plans tasks to fix the database indexes fragmentation issue is not highly recommended. Mohamad Mahmoud Darwish. Please refer to SQL Server Maintenance Plan Reorganize Index and Update Statistics Tasks to get more information about how to design the maintenance plan. Note that the time it takes to complete the operations depends on the size of the database and how fragmented the indexes. Users(DisplayName) WITH (ONLINE = ON, RESUMABLE = ON, MAX_DURATION = 1); Those parameters mean: ONLINE = ON means you’ve got the money for Enterprise Edition. 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. sp_start_job N'NAME OF JOB'. SQL Server also supports nonclustered columnstore indexes. Next Steps This is a simple base script that could be modified into a stored procedure and also allow you to pass other parameters such as. SQL Server provides sys. 3. indexes. Bug in Rebuild on SQL Server 2016 and above? 6. In this case Reorganize option is selected: DBCC DBREINDEX rebuilds an index for a table or all indexes defined for a table. The query causing the block is in the format: ALTER INDEX [indexName] ON tableName REORGANIZE. Index Rebuild : This process drops the existing Index and Recreates the index. Index automation Job script. NAME 'Table name', i. The first and most popular method is to rebuild indexes. One of the possibilities that we have in SQL Server to keep our indexes defragmented, is the index reorganize operation. dm_db_index_physical_stats (NULL, NULL, NULL, NULL, NULL); GO. Designing the SQL Server Reorganize Index Task. It's so bad on indexes that fragment that it's actually the cause of the myth of Random GUID Fragmentation. This script has been tested and will work with SQL Server 2005, SQL Server 2008, SQL Server 2008R2, SQL Server 2012, SQL Server 2014, SQL Server 2016, SQL Server 2017 and SQL Server 2019. I’m talking about the guidance which is: if an index has less than 1000 pages and is in memory, don’t bother removing fragmentation. Drag and drop the index rebuild task from the maintenance plan toolbox. This will obviously alleviate both internal and external fragmentation but is a more heavy weight operation and by default causes the index to go offline, although it can be performed as an online operation, depending on your SQL. Rebuild if > 30%. ALTER FULLTEXT CATALOG [CatalogName] REBUILD. Total fragmentation is 96% page fullness 66%, avg row size is 20,. August 1, 2013 at 3:52 pm. First, we will start the index reorganization in a session using the following T-SQL code. Statistics on indexes automatically get updated when the indexes are rebuilt. We need to drag and drop tasks from the Toolbox (to open the toolbox use Ctrl + Alt + X) into the gray workspace area on the bottom as shown in the below screenshot. Update Statistics. Because of this, and also the fact that in such a small index that fragmentation is typically negligable, you really should only be rebuilding indexes with a certain page threshold. There are a number of differences. 1. e check fragmentation and take an appropriate action. Rebuild Index using ApexSQL Defrag ApexSQL Defrag Overview. Right-click on Maintenance Plans and select New Maintenance Plan…. The. This method can help when Change_tracking is Auto. if the index has: less than 5% logical fragmentation, don’t do anything. Working this way is usually optimal, since SQL Server does not have to update the NCIs while the data is being imported. I'd just add that adding the line PRINT @sql after the SET @sql =. Jonathan’s right in that fragmentation changes the query plan. This caused the system to reorganize or rebuild. SELECT OBJECT_NAME(ind. I suspect the reorganize is compacting the index after the rebuild and thus moving quite a bit of data around. در این مقاله چگونگی reorganize و rebuild کردن ایندکس تکه تکه شده (Fragmented Index) در SQL Server 2014 با استفاده از محیط SSMS یا SQL Server Management Studio و T-SQL یا Transact-SQL شرح داده خواهد شد. every 2-3 day if running maintenance once per day (night). Index Rebuild operation first drops and then recreates the index. 1. When investigating we found that the index reorganise for the clustered index of FooDetail takes between 90 minutes and 120 minutes. There are two options to fix fragmentation. x)) e Banco de Dados SQL do Azure, REORGANIZE executa as seguintes otimizações adicionais desfragmentação online: Remove fisicamente linhas de um grupo de linhas quando 10% ou mais linhas foram excluídas logicamente. 1. Thanks, I will try this next time. An index can become fragmented over time as data is added, updated, or deleted, and this fragmentation can lead to longer query execution times and decreased performance. INDEX_REORGANIZE Reorganizes the index. Whether you rebuild or reorganize indexes depends on the following guidelines: avg_fragmentation_in_percent value Corrective statement. index_id > 0 -- Indexes. You can instantly rebuild and reorganize SQL Server indexes in visual mode or generate SQL scripts for future use. The Reorganize Index task also includes an option to compact large object data. I would like to rebuild and reorganize my indexes, but our system works 24/7. When you reorganize an index, SQL Server sorts the index pages and releases the unused space within the index pages. Until now I'm using the Maintenance Plan Index rebuild task to. In this article. Applies to: SQL Server. Sc (Comp Sci) SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability. The real moral of the story is that it’s really hard to build demo code that effectively conveys the point you want to make. There is all reason to only rebuild index that are fragmented, and a good maintenance. Index in SQL Server . An index can become fragmented over time as data is added, updated, or deleted, and this fragmentation can lead to longer query execution times and decreased performance. This blog entry I came across a while back will explain it much better than I can. 2. Sc (Comp Sci). 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')In this article. The Reorganize Index task reorganizes all indexes, regardless of fragmentation level. So let’s take one thing at a time. Hallengren website has an option to reorganize indexes say with 5% Fragmentation, and rebuild for 30% Fragmentation. But the index is updating itself properly. Using above query, you could also query the progress of backup,restore,dbcc command and so on. The fi rst factor is whether you have SQL Server Standard Edition or SQL Server Enterprise Edition. This means that an index can be rebuilt without knowing the structure. @LeeWalters shrink is done, and yes, due to disk issues, not possible to add drives, that's why, in addition, db is populated with blob data, so the question is more from the index fragmentation side. Expand the Indexes folder. It doesn't work the way you think it does. 2. Usually, you should rebuild the index if it has a fragmentation greater than 30% and reorganize it if it has less than 30% fragmentation. If the command that's running is a reorg, you can just kill it. The. One thing to ask! When I reorganize MSDB. Rebuild or Reorganize SQL Index. Speaking for SQL Server, I tend to choose a index size and index fragmentation level at which point I begin performing index maintenance. It was trying to do so because when. it will reorganise it. Rebuilds automatically run statistics on your indexes. The equivalent statistics update can be achieved by: UPDATE STATISTICS . REORGANIZE, UPDATE STATISTICS and a simple SELECT statement. In earlier versions of Microsoft SQL Server it could cause system slowdown to reorganize or rebuild a large index. dm_db_index_physical_stats in a script to rebuild or reorganize indexes). ALTER INDEX [name_of_the_index] ON [table_name] REORGANIZE; If you want to reorganize all the indexes on any table, you can run the following syntax. This is a best practice for performance when you rebuild or reorganize indexes. Optimize SQL Server non-clustered indexes and queries by considering index fields, compound indexes and SQL Server statistics. In order to resolve the index reorganization issue, we will enable the row and page level locking by altering the index as shown below: USE MSSQLTipsDemo GO ALTER INDEX [PK_Product] ON [Production]. ALTER INDEX All ON tableName REBUILD; This drops the index and recreates it, removing fragementation, reclaims disk space and reorders index pages. . The first rebuilds a single index on a table and the second rebuilds all the indexes on the table. The discussion of columnstore indexes thus far has focused on clustered columnstore indexes that target a primarily OLAP workload. 2. The transaction log backup size spikes during index reorganize - exponentially bigger. I'd just add that adding the line PRINT @sql after the SET @sql =. Execute SQL Server Agent Job. SQL Server Database Engine. We have experience performance issue if fragmentation is high and page count <1000. 7. We recently switched to Ola Hallengren's maintenance script and automated the deployment of MaintenanceSolution. However, recently this approach has. Microsoft Certified Master: SQL Server, MVP, M. SQL Server index fragmentation is unavoidable, but you can minimize the negative effects of fragmentation on database performance. ALTER INDEX REBUILD on an truncated and therefore empty table serves no purpose, so you need to amend your Plan A. Suggest you investigate alternatives, such as [Ola Hallengren's SQL Server maintenance tools][1] - free to use. Expand the Tables folder. As a result of rebuilding an index, SQL Server also updates the statistics for the indexes that were rebuilt. dm_db_index_physical_stats (under the Examples -> D section: Using sys. Release unused space. configurations setting for fill factor. Let’s move on to creating the Reorganize Index task via the Maintenance Plans and then Update Statistics task. First, we will start with the "Maintenance Plan Wizard":The rebuild command will defragment all those intermediate pages. In SQL Server 2017, however, there is a resumable-online index rebuild feature. reorganize pages. Shrinking is a wasteful operation. index_type_desc,. – variable. Yes. Since we are facing huge performance problem we have scheduled this Rebuild index task. e. 35. This makes it more likely that some other session is blocked by your session, and that you may, in turn, become blocked by a lock held by that session. Still, non-clustered indexes will be left to rebuild/reorganize occasionally, but they are much smaller than table itself. There are two options to fix fragmentation. REORGANIZES works by moving pages around, one at time. dm_db_index_physical_stats function is avg. Executing this query requires the VIEW SERVER STATE permission. #969726. Cancelling / Stopping ALTER INDEX REORGANIZE. The scripts has some cool features like. It's not documented to have a particular deadlock priority, and it does make data changes. They are also configured from SSMS. Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance. So any insert in the middle of the key range, and likely any update too, will cause a page split and fragmentation. インデックスの断片化の状態がわかったら、それによってインデックス (index) を再構成 (Reorganize)するか、または再構築 (Rebuild) するか決定します。. sysindexes compatibility view; therefore, preventing unnecessary updates of unchanged items. Reorgs require statistics run manually (exec sp_updatestats) From the description it sounds like a less intrusive operation and only less recommended because it's an older, slower process during which the DB will be less responsive. Index rebuilding and reorganizing are the two methods to maintain indexes and improve database performance. 5% to 30% -> ALTER INDEX REORGANIZE Over 30% -> ALTER INDEX REBUILD WITH (ONLINE = ON)* However, we have noticed that even with really high fragmentation (over 95%) on large and small tables, REORGANIZE works fine. Give it a go with its fully functional 30-day free trial. To create a new job, right click on SQL Server Agent, select New and then Job. dm_exec_requests showed the REORG was only 55%. A clustered index exists, along with 3 non-clustered indexes. Over time these modifications can cause the information in the index to become scattered in the database (fragmented). Executing this query requires the VIEW SERVER STATE permission. We have a database server (2016 SQL Server), that we have added a step of 'rebuilding indexes' to the deployment process. . Rebuild/Reorganize working fine. The answer is: it depends. Online & Offline Index Rebuild. Select * from sys. SQL Server also supports nonclustered columnstore indexes. Last weekend the index maintenance took more than 5 hours and the full backup was running at the same time. IndexOptimize is the SQL Server Maintenance Solution’s stored procedure for rebuilding and reorganizing indexes and updating statistics. The length of time the rebuild takes is related to the size of the index, not the amount of fragmentation in it. The first steps of configuring the Reorganize Index task is quite similar to the Rebuild Index task. This means that an index can be rebuilt without knowing the structure. Below is an example of this technique, where the @PartitonNumber value can be changed in a restart scenario. 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. Table locks alone would not make sense, the point with REORGANIZE is that the table is mainly online while the operation is running. Requires ALTER permission on the table or view. dm_db_index_physical_stats dm function. Reference to below article and discussion, rebuild only if page count >=1000If you want to try : I would like you to use READ_COMMITTED_SNAPSHOT isolation level for this operation and see if you succeed. This allows you to interrupt the rebuild and preserve the work already done. ALTER INDEX CCI_TEST on DBO. For a more in-depth discussion of index rebuild and maintenance in SQL Server 2014 see SQL 2014 Clustered Columnstore index rebuild and maintenance considerations Consider the two trimmed row group scenarios below:AFAIK, In the Alter index statement if we use MAXdop option it is only specific for that index operation and not applicable whenever the index is used by a query. Well, I’d wager some of it is backwards compatibility. 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. REBUILD will not just rebuild index, but also force update of corresponding statistics. In this one case, it happens to make the query. I'd like to propose to use REORGANIZE index and so I need to tell the related real benefits. By allowing an index to be rebuilt dynamically, indexes enforcing either PRIMARY KEY or UNIQUE constraints can be rebuilt without having to drop and re-create those constraints. Expand the table on which we want to reorganize the indexes. You can do maintenance in phases, where each maintenance phase covers a subset of. You also can create a linked server to SQLAZURE and create a sql agent job. Index rebuilding and reorganizing are the two methods to maintain indexes and improve database performance. If You have few indexes in. If you specify the hint. Expand Tables. Problem. This had a negligible impact. regarding index rebuild or reorganize for system database **I do not see a need** out of all system databases, tempdb is recreated whenever SQL Server service starts, Model is used as a template database. This removes fragmentation, reclaims disk space by compacting the pages based on the specified or existing fill factor setting. Reorganize all indexes on the queue internal table. Reorganizing only works on the leaf pages. Basically, rebuilding is a total rebuild of an index - it will build a new index, then drop the existing one, whereas reorganising it will simply, well. 3. First it’ll try an index reorganize, which is an online operation. File type (Data), group (PRIMARY) Name () Shrink Action = reorganize pages (=move to front), Shrink File *. Expand the table on which you want to reorganize an index. Similarly, removing fragmentation in a. This tip will explore two features to speed up SQL Server index and statistics maintenance. Parallel index execution and the MAXDOP index option apply to the. Right-click the index you want to reorganize and select Reorganize. Therefore, you do not need to update statistics after performing ALTER INDEX REBUILD, DBCC DBREINDEX, DBCC INDEXDEFRAG, or ALTER INDEX REORGANIZE operations. Over here it will display all the indexes of the table and you can just click OK. 1. This could be done (and is in some databases) when. Applies to: SQL Server. It depends. Dalam indeks rowstore, SQL Server mengimplementasikan pohon B+. Regards. Copied the LOB column to another table, dropped the column, re-created the column, and copied the data back (as outlined in this post: Freeing Unused Space SQL Server Table). It checks the SQL Server licences, if Enterprise it will rebuild the index online else it. You can safely stop it but you need to find out why your database became slow. 例えば、10 % 以上 30 % 未満であれば再構成 (Reorganize)、 30% 以上であれば再構築 (Rebuild) するとすれば、上記の. Frequency of the maintenance should be considered with the goal of minimizing impact of log generation. 1. 5. Mohamad Mahmoud Darwish. You can always update statistics on their own. The simple reason which comes to my mind is rebuild should be done only when index is fragmented. Below the last two rows that displays the fail: Source: Reorganize Index Executing query "ALTER INDEX [PK_xxTableName] O. The first and most popular method is to rebuild indexes. SQL. However, none of the other metrics appear to indicate that the system is. The size of one of the PK Clustered indexes is greater than 200GB, and for this one a REBUILD. So far, all good. I know the sql to perform this action on all indexes in a table is. Jan 11 at 14:24. CREATE PROCEDURE dbo. Backup Up Database (Full)4. You can apply a new fillfactor when you rebuild an index. – The scripts has some cool features like. Feb 21, 2022, 8:01 AM. (Look in the Misconceptions blog category for the rest of the month’s posts and check out the 60-page PDF with all the myths and misconceptions blog posts collected together when you join our Insider list, plus my online Myths and Misconceptions training course on Pluralsight. The syntax for rebuilding indexes is very simple, we just add the "WITH ONLINE=ON" clause to the ALTER INDEX command. 1. Index fragmentation increased significantly after rebuild. IndexOptimize is supported on SQL Server 2008, SQL Server 2008 R2, SQL Server 2012, SQL Server 2014, SQL Server 2016, SQL Server 2017, SQL Server 2019, SQL Server 2022, Azure SQL Database,. You can also change this threshold via parameters. If an index contains less than 100 pages, I will perform no maintenance. Last night I killed the REORG on the clustered index after almost 6 hours of execution. The Reorganize Index task encapsulates the Transact-SQL ALTER INDEX statement. When I run a maintenance plan to reorganize and rebuild tables indexes, it fails. For more information about managing indexes, see Reorganize and Rebuild Indexes. 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 optionHello, We are running SQL 2005 and I just looked over my tables indexes, and most of the indexes were very fragmented. Click the plus sign to expand the table on which you want to rebuild an index online. You can read more on rebuilding indexes here . Remarks. Right-click Maintenance Plan and select Execute. So now once you have identified the high fragmentation level in your database, which could. Some operations that took ~90s now take ~6mins. 1. Coming to update stats, I would prefer to do it with Full Scan depending on the size of the databases. REORGANIZE is an "online" operation, which means it doesn't take a big Sch-M lock at the beginning of the operation to have exclusive.