They can all be used with no special considerations for replication, with the following exception: primary keys are required on tables in transactional publications, so you cannot drop and recreate primary keys on these tables. 2. If you want to know how far along it is, open up another instance of SSMS and connect to the server, then run a query against the sys. Example #. #969726. The first and most popular method is to rebuild indexes. Designing efficient indexes is paramount to achieving good database and. We will use 3 statements in order to show the blocking: ALTER INDEX. However, you can create a staging table insert all rows into that, drop original table and rename staging table to original. #1162454. As a general (widely accepted) rule of thumb is . The fix is to update all rebuild index scripts with explicitly ONLINE option on ON and to make sure it will run on a SQL Server version that supports this (Enterprise and Developer editions) and that will rebuild online only allowed indexes. Here is MSDN article on this: Reorganizing and Rebuilding Indexes. 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. However, a new database server backed with Intel PCIe SSDs is showing the opposite of what we expect. SQL Server also supports nonclustered columnstore indexes. ALTER INDEX . index_type_desc,. You can use Ola's Index maintenance solution or Michelle Ufford's - Index Defrag Script. Sysjobhistory index "nc1" that is on job_id, its fragmentation does not go less than 66. In order to rebuild the index SQL Server still needs a copy of the data and must reorganize the data as the index is rebuilt. 2. every 2-3 day if running maintenance once per day (night). Recall the paper example from above: a rebuild would be like reprinting the document in the correct order and trashing the old ones. This means you can grant alter table on every table of interest that already exists. It doesn't work the way you think it does. Expand Tables. Index rebuilds (not index reorganise) always do a fullscan update of the statistics. Expand Databases, and then expand the database that contains the full-text index. dm_db_index_physical_stats) is <1000 you don't need to rebuild or reorganize such. Microsoft Certified Master: SQL Server, MVP, M. 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. dbForge Index Manager provides smart index fixing and fragmentation. Select Allow online DML processing, and then select True from the list. To run the Maintenance plan, make sure your SQL server agent service is running. REORGANIZE, UPDATE STATISTICS and a simple SELECT statement. As well as maintenance plans, SQL Server Agent jobs are also a handy way to automate and schedule index defragmentation jobs in SQL Server. Select the server connection to use when performing this task. It also lets you specify a LOB_COMPACTION option. This might be a good time to stop blindly rebuilding indexes. Solution. We leave default values here as well. Over time these modifications can cause the information in the index to become scattered in the database (fragmented). Here is a sample script to reorganize any index in SQL Server. "There are a variety of mechanisms for rebuilding indexes. First, we will start with the "Maintenance Plan Wizard":The rebuild command will defragment all those intermediate pages. The documentation is also indicating that: Online index operations are not available in every SQL Server edition. This task uses the ALTER INDEX REORGANIZE statement with SQL Server databases. Index reorg only shuffles around leaf-level pages of your index and will try to compact those - but it doesn't completely rebuild the index structure. Then monitor and tweak jobs in a way that is appropriate to. The syntax for rebuilding indexes is very simple, we just add the "WITH ONLINE=ON" clause to the ALTER INDEX command. In this article. Applies to: SQL Server SSIS Integration Runtime in Azure Data Factory The Rebuild Index task rebuilds indexes in SQL Server database tables and views. Index Rebuild operation first drops and then recreates the index. DBCC DBREINDEX rebuilds an index for a table or all indexes defined for a table. They are also configured from SSMS. index_id > 0 -- Indexes. Large objects (LOBs) are stored in different "pages". Merging the full-text index fragments can improve performance and free up disk and memory resources. Bug in Rebuild on SQL Server 2016 and above? 6. Yup. That is not the last rebuild date of the index, it's the date the. If an index is between 10% and 30% fragmented, I will REORGANIZE the index and UPDATE the statistics. Rebuilding an index does two things. In addition, reorganization uses minimal resources and is automatically performed online, without. The default value for this parameter will be ‘CATALOG’. column_name DISABLE; ALTER INDEX. But, fill factor is defined in index properties, and is not overriden in index rebuild settings, so I believe both operations should respect the value. The Reorganize Index task also includes an option to compact large object data. SQL Server development version and Enterprise version has option ONLINE, which can be turned on when Index. The discussion of columnstore indexes thus far has focused on clustered columnstore indexes that target a primarily OLAP workload. The Page Fullness is 98. 000. Quick explanation: An online Rebuild, rebuilds the indexes on the tempDB making it available to the queries while it is being rebuilt. Reorganizing only works on the leaf pages. Executing this query requires the VIEW SERVER STATE permission. REORGANIZE [ WITH ( LOB_COMPACTION = { ON | OFF } ) ] Applies to: SQL Server 2016 (13. . Ignore anything with less than 15-20 pages. Starting with SQL Server 2016 (13. The first steps of configuring the Reorganize Index task is quite similar to the Rebuild Index task. SELECT OBJECT_NAME(ind. Below the last two rows that displays the fail: Source: Reorganize Index Executing query "ALTER INDEX [PK_xxTableName] O. ApexSQL Defrag tool is a 3 rd party SQL index defragmentation tool that you can easily use to perform number of operations related to the SQL Server indexes. SQL Server also supports nonclustered columnstore indexes. Msdn says:. ALTER INDEX CCI_TEST on DBO. x) and later. Once you select that option it will bring up the following screen. I disagree with the 30% rule. Total fragmentation is 96% page fullness 66%, avg row size is 20,. First, we will start the index reorganization in a session using the following T-SQL code. The performance benefit may not be noticeable for indexes that are used primarily for seek operations. SQL Agent doesn't connect as SA, and the rebuild index task generates a command that looks like ALTER INDEX [ci_FactInternetSales] ON [dbo]. This will invoke the Tuple Mover , which will turn closed delta stores into compressed rowgroups. It reorgs indexes when fragmentation is below 30% else it rebuild the index. We want to create an index. Similarly, removing fragmentation in a. So far, all good. is_ms_shipped = 0 --Excludes any objects created as a part of SQL Server installation AND ss. To execute our task, we can right-click on the plan and choose Execute. New. Disk space is an important consideration when you create, rebuild, or drop indexes. Index Rebuild operation first drops and then recreates the index. 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 Query Optimizer. To create SQL database maintenance plan, launch SQL Server Management Studio > expand the database instance > Management > right-click on the maintenance plan > New Maintenance Plan. 5. 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. When I run a maintenance plan to reorganize and rebuild tables indexes, it fails. When you. . This could be done (and is in some databases) when. Some operations that took ~90s now take ~6mins. ALTER INDEX ALL ON [table_name] REORGANIZE; However, if you want to rebuild all the indexes on the table, you can run the following. . Obviously this isn't the same as index reorganize, so I'm still trying to think what does reorganize file technically mean. Many people (and even solutions) in the SQL Server community say you need to look at Index Fragmentation levels (e. dm_db_index_physical_stats dm function. The fill factor determines the amount of empty space on each page in the index, to accommodate future expansion. Applies to: SQL Server. こんにちは。開発部基幹SREチームの廣瀬です。 弊社では、システムの一部にSQL Serverを使用しています。 本記事では、SQL Serverにおけるインデックスのメンテナンス方法である再構成と再構築について、それぞれを実行した場合のクエリ性能の比較結果をご紹介したいと思います。 比較を実施. Reorganize/Rebuild SQL Server database indexes using ApexSQL Defrag ApexSQL Defrag is a 3rd party tool made specifically to automatically fix index fragmentation in SQL Server databases. SQL Server development version and Enterprise version has option ONLINE, which can be turned on. Rebuild of indexes is the prime job of a DBA as heavily fragmented indexes can degrade query performance and cause your application to respond slowly. 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。. SQL Server NULL Index. We have a database server (2016 SQL Server), that we have added a step of 'rebuilding indexes' to the deployment process. Still, non-clustered indexes will be left to rebuild/reorganize occasionally, but they are much smaller than table itself. @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. Index Rebuild : This process drops the existing Index and Recreates the index. Because I was blamed for the slow SQL Server mainly because I. Expand the Indexes folder. Check indexes from the index grid and click desired defragment operation from the ribbon. One of the possibilities that we have in SQL Server to keep our indexes defragmented, is the index reorganize operation. These scripts are widely tested in the community and are much flexible so that you can. By default, SQL Server uses a 100% fillfactor and tries to fill up all the pages in indexes as close to full as it can. To fix the fragmentation either rebuild or reorganize the index on the table. Reorganize an index For rowstore indexes, the Database Engine defragments only the leaf level of clustered and nonclustered indexes on. 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. Rebuild and Reorganize Index using SQL Server Management Studio (SSMS) Find and expand the table in Object Explorer >> Open Indexes >> Right-click on the target index >> Rebuild or Reorganize. Click OK. First, we will start the index reorganization in a session using the following T-SQL code. dm_db_index_physical_stats function is avg. This means there is only 140-ish byte free per page. To rebuild or reorganize indexes manually, head over to the Fragmentation tab. When you double click on this task the following screen appears. For more information, see sys. If the index’s design doesn’t allow for that, IndexOptimize will try to rebuild the index online. [Test] REBUILD WITH (ONLINE = ON); Additionally, I would only rebuild indexes which require it. From Reorganize and Rebuild Indexes. Rebuilding basically creates an entirely new copy of the index, and is much more effective at reducing fragmentation - but this comes at a cost, both in terms of time and disk space. My problem is that the reorg is running for a very long time. Reorganizing should be used at lower (<30%) fragmentations but only rebuilding (which is heavier to the database) cuts the fragmentation down to 0%. Bad internal fragmentation (having lots of free space on the pages) means the index is bigger than it needs to be. 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. Pay attention to execution time though. Right-click the index that you want to rebuild online and select Properties. Create a new server connection to use when performing this task. object_id =. First, we will start with the "Maintenance Plan Wizard": The rebuild command will defragment all those intermediate pages. ALTER INDEX [myIndex] ON [dbo]. I'm just using the reorg index task that is in the maintenance plan designer GUI. USE AdventureWorks; GO ALTER INDEX ALL ON Production. In SQL Server, the ALTER INDEX statement is used to modify an existing index. Backup Up Database (Full) 4. Thanks for your reply. Please refer to SQL Server Maintenance Plan Reorganize Index and Update Statistics Tasks to get more information about how to design the maintenance plan. For example, the heaviest index (clustered index and also pk) is running reorg for around 4 hours 30 min even do the index was. This schema modification lock blocks all other concurrent access to the table, but it is only held for a very short period of time while the old index is dropped and the statistics updated. Microsoft's guidance on index reorganize and rebuild supports this: For example, if a given index is used mainly for scan operations, removing fragmentation can improve performance of these operations. If you cancel a rebuild operation midway, it. Index fragmentation increased significantly after rebuild. The. This index uses column-based data storage and query processing to achieve gains up to 10. To create a new job, right click on SQL Server Agent, select New and then Job. Hallengren website has an option to reorganize indexes say with 5% Fragmentation, and rebuild for 30% Fragmentation. Books Online for ALTER INDEX (Transact-SQL) Free index maintenance tool (and much more) Tags; index fragmentation;SQL Server 2016 allows customer to defragment this index using the familiar ALTER INDEX <index-name> REORGANIZE command instead of using a heavy hammer approach of rebuilding the index. Just a reminder that index reorganize is always online (all indexes are available during defrag) and index rebuild can be made also online (WITH. avg_page_space_used_in_percent column in the sys. And they really shouldn't be because you're using Standard Edition - and parallel index operations are an Enterprise Edition feature. Index rebuilding process uses more CPU and it locks the database resources. If page_count value ( which is there in DMV sys. Whether you rebuild or reorganize indexes depends on the following guidelines: avg_fragmentation_in_percent value Corrective statement. Rename it to the Nightly Index Maintenance job. " Disagree with this as I have a system in. You also can create a linked server to SQLAZURE and create a sql agent job. Here are the steps to reorganize indexes using the SSMS: In Object Explorer, expand the database that contains the table on which we want to reorganize an index. It gives you better advantage when tempdb is. To create SQL Server agent that will defragment specified indexes automatically, perform the following steps: Expand SQL Server Agent in Object explorer, right click on Jobs, and select New Job…: In General tab, specify the name and description for the job. The. So it can remove some fragmentation - but only on a limited scale. index_id = 0 -- Heap or table indexstats. setting shrink file = 2GB (max it allows) 3. Here's another script to add to the list. Right-click on Maintenance Plans and select New Maintenance Plan…. 2. When you reorganize an index, SQL Server physically reorders the leaf-level pages to match the logical order of the leaf nodes. SORT_IN_TEMPDB means that SQL server will use tempdb to allocate the temporary space as opposed to allocating space in the user database whose index is being rebuild. Reorganizing also compacts the index pages. This means every time we need to scan the. Which is the best method to reorganize sql server database. This allows you to interrupt the rebuild and preserve the work already done. the reorganize index also facing some problem like it is successfull once in three runs and twice it is failing. 8. @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. You should intelligently do index reorg and rebuilds. Rebuilding an index can be either an online operation or an offl ine operation, depending on several factors. If rate of Index fragmentation increased then index de-fragmentation is become required. That can be found using the STATS_DATE function. Reorganize does not holds blocking locks. What I'm hoping is that while the new index is being built Sql Server can use the original (somewhat fragmented index), then after the new temp index is built it can start using that one, then we drop the fragmented index and rename and we're back to the original state for the next time we have to run our scheduled job. Method 2: Set Change_Tracking to Manual, by using the following command: ALTER FULLTEXT INDEX ON table_name set Change_tracking = Manual Then, create SQL Server jobs to spread. The query causing the block is in the format: ALTER INDEX [indexName] ON tableName REORGANIZE. 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. (About 1 TB of data including myIndex (non. You might ask why you should do this yourself, since this is what the tuple-mover. 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. However, imagine that you have seven years of data. In it, enter the Job name, owner, optionally Category. As a good start, read these: Rebuild or Reorganize: SQL Server Index Maintenance (Kendra Little)“Reorganize” index option. Reorganize Index. Basically every hour I query the dm_db_index_physical_stats dynamic management view and if an index is between 5% and 30% fragmented I. 0. Bulk amount records are deleted and updated frequently. Any helps to me, please? Thanks · REORGANIZE is always an online operation, that is, it does not block. In Object Explorer, Expand the database that contains the table on which you want to reorganize an index. For more information, see Data Types (Transact-SQL). SQL Server 2019 adds resumable online index creation, and it’s pretty spiffy: 1. Designing the SQL Server Reorganize Index Task. If the underlying table is a clustered index, then for the CI and all non-clustered indexes both rebuild and reorganize are available. (About 1 TB of data including myIndex (non-clustered)). Rebuild the Indexes if the Fragmentation level is > 30%. All versions of SQL Server 2008 Management Studio create the index with page level locking enabled by. On large tables, that may be a while and not frequent enough. dm_exec_requests showed the REORG was only 55%. Hi, We have SQL Server 2005 EE 62 bit with SP3. . dm_db_index_physical_stats (NULL, NULL, NULL, NULL, NULL); GO. Over here it will display all the indexes of the table and you can just click OK. Dokumentasi SQL Server menggunakan istilah pohon B umumnya dalam referensi ke indeks. Doing online operations not only reduces the need for the maintenance window, but they can be done more often throughout the week. ALTER INDEX [PK_SalesOrderDetailEnlarged_SalesOrderID_SalesOrderDetailID] ON [Sales]. This tool provides index analysis to manage index defragmentation, including rebuild and reorganize fragmented indexes . REORGANIZE, but shrink is going to take an age, and then you’ll generate a ton of log doing the fragmentation removal. 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. Creating a SQL Server Maintenance Plan. 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. The script for the index itself: ALTER TABLE [dbo]. USE AdventureWorks; GO ALTER INDEX ALL ON Production. I would prefer to rebuild the indexes where the fragmentation percent of the indexes is greater than 30% and a Re-org of indexes where fragmentation percent is in between 9% and 30%. alter index all on table_name reorganize; But I only want to rebuild or reorganize if fragmentation percentage on each index is between a certain range. This means that an index can be rebuilt without knowing the structure. Our Production instance is running SQL Server 2014. Here is the image for additional clarity. Modifying a SQL Server Maintenance Plan. As a generally accepted good practice reorganize only when ragmentation of index is between 5 to 30 % for anything more than that rebuild the index. For maintenance i create a procedure that: -Shrink Database file (if is enabled) -Shrink Database log file. In the Rebuild Indexes dialog box, verify that the correct index is in the Indexes to be rebuilt grid and click OK. Reorganizing an index uses minimal system resources. A table may only have one columnstore index on it at a time, regardless of whether it is clustered or nonclustered. Enable Row Level and Page Level Locks. Rebuild Index using ApexSQL Defrag ApexSQL Defrag Overview. When using columnstore indexes, the delta store may end up with multiple small row groups after inserting, updating, and. – variable. I'm able to rebuild all other indexes with online=on option and it won't affect performance. Reorganizing tries to put the leaf level of the index back in logical order within the pages that are already allocated to the index. 0. dm_db_index_physical_stats DMV). dm_os_performance_counters where counter_name = 'page splits/sec'. RCSI utilizes tempdb heavily but gives performance boost. This means long-term blocking table locks are not held and queries or updates to the underlying table can continue during the ALTER INDEX REORGANIZE transaction. It is compatible with all versions of SQL Server 2005 , 2008 , 2012 , 2014 and 2016. - 1: The script will just output the index reorganization or rebuild commands without running them. between 5% and 30% logical fragmentation, reorganize it (using DBCC INDEXDEFRAG. Sc (Comp Sci). Anyway, since works on page level, it needs to use page locks. e. Last night I killed the REORG on the clustered index after almost 6 hours of execution. [Product] SET ( ALLOW_PAGE_LOCKS = ON ) ALTER INDEX [PK_Product] ON [Production]. The syntax for rebuilding indexes is very simple, we just add the "WITH ONLINE=ON" clause to the ALTER INDEX command. Index in SQL Server . 1 Answer. Product REBUILD GO Index Reorganize : This process physically reorganizes the leaf nodes of the index. REORGANIZE cannot be specified for a disabled index or. Update Statistics. This REBUILD option is available in SQL Server 2008 onwards. Therefore, you do not need to update statistics after performing ALTER INDEX REBUILD, DBCC DBREINDEX, DBCC INDEXDEFRAG, or ALTER INDEX REORGANIZE operations. 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. e check fragmentation and take an appropriate action. 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). Its wide range of features allows users to create and manage custom policies, monitor index fragmentation on multiple servers as well as to create index fragmentation reports. Index rebuilding process uses more CPU and it locks the database resources. When to rebuild and when to reorganize indexes. It can be done with online option in enterprise edition. 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. If the index you wish to reorganize is not listed in the “Indexes to be reorganized” section, ensure that it has been added to this section and then click the “OK” button. From a transaction log standpoint, reorganize index generates a lot more small transactions and can lead to substantially more resource-consumption than a rebuild. The documentation for alter index, for example, shows that it accepts an index_name, not an expression that might evaluate to an index name. Yes. allocation_units. Index rebuilding and reorganizing are the two methods to maintain indexes and improve database performance. Use the ReorganizeIndex Task dialog to move index pages into a more efficient search order. ”. April 1, 2009 at 5:07 am. LOB_COMPACTION Compacting large object (LOB) data can reduce the disk space used. 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). An index reorganize holds an intent-exclusive table lock throughout the operation, which will only block shared, exclusive, and schema-modification table locks. The fi rst factor is whether you have SQL Server Standard Edition or SQL Server Enterprise Edition. Is this possible to do? Creating a SQL Server Maintenance Plan. You can also slow down fragmentation by inserting data in the order of the index. There are some good reasons to Rebuild an index, like updating statistics. DECLARE. Expand the Tables folder. First, since you're literally rebuilding the index, it reorders the pages and the rows on those pages. dm_db_index_physical_stats (NULL, NULL, NULL, NULL, NULL); GO. The issue is resolved. August 1, 2013 at 3:52 pm. Untuk informasi selengkapnya, lihat panduan arsitektur dan desain indeks SQL Server. – Ed B. Reorganize: The Reorganize operation is an online operation, and moves the closed row groups into the Columnstore. 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,. In this case Reorganize option is selected: DBCC DBREINDEX rebuilds an index for a table or all indexes defined for a table. 2) Extra disk space required during SQL Server online index rebuilds. I cannot understand the reason, can you ?. Shrink File is. 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. less than 10% logical fragmentation, don’t. REBUILD will not just rebuild index, but also force update of corresponding statistics. x) and in Azure SQL Database, we recommend using ALTER. A page is a small section of a database, typically an 8kb chunk. SQL SERVER – Difference Between Index Rebuild and Index Reorganize Explained with T-SQL Script. 環境SQL Server 2012参考前回の以下の投稿に若干手を加えて作成しました。SQL Server の指定したテーブルのインデックス名を取得する方法ストアドプロシージャを実装するC…According to BOL:’In SQL Server 2005, sp_updatestats updates only those statistics that require updating based on the rowmodctr information in the sys. For higher fragmentation Rebuild is preferred. Do not use REORGANIZE. But no help, the rebuild itself not working. Both versions allow you to specify the. We have a maintenance script which analyses the page_count and fragmentation of the indexes and follows the following guideline:-. 0 to SQL Server 2016 there is no feature to rebuild index automatically. 1. Does database on which tables reside have database owner. Microsoft's guidance on index reorganize and rebuild supports this: For example, if a given index is used mainly for scan operations, removing fragmentation can improve performance of these operations. If the index is disabled, rebuilding brings it back to life. SQL Server internally does not keeps in any system table the fragmentation value so how it is going to decide what criteria to select when. For example, you can use ApexSQL Defrag to review the index usage statistics and apply the suitable. I have been trying to gather information about rebuilding and reorganizing indexes. They are also configured from SSMS. index_type_desc AS IndexType, indexstats. Defragmentation in Practice. In the Description box, briefly describe your maintenance plan. SIMPLE mode only means the log space is made available for reuse after a transaction is committed. Also, it is possible to do it with the help of SSMS (SQL Server Management Studio): Choose the database and then the table where you want to Reorganize and. But commit your whole transaction before reorganize. Wouldn’t rebuilding an index with MAXDOP=4 on a heavily utilized SQL Server result in the index being (again) fragmented after the rebuild? This could happen in the case where they’re a lot of statements waiting to be processed and the database engine assingning the subtasks of the index reorganize in portions to different queues. This happens approx. ” Select the vault database(s). 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. In SQL Server 2017, however, there is a resumable-online index rebuild feature. it will reorganise it. The guidance from Microsoft is that indexes be rebuilt if the fragmentation is over 30% and reorganized if the fragmentation is between 5 and 30%. Frequency of the maintenance should be considered with the goal of minimizing impact of log generation. REORGANIZE, or to rebuild the index using ALTER INDEX. The index it is running against is 78% fragmented. Reorganizing an index uses minimal system resources and is an online operation. Index maintenance such as index rebuilds are also a wasteful operation. " But following the Russ's reply the REORGANIZE is a more time expensive operation the REBUILD one. Reorganize all index in SQL Server. The size of one of the PK Clustered indexes is greater than 200GB, and for this one a REBUILD. Depending on the type of index and database engine version, a rebuild operation can be done online or offline. It checks the SQL Server licences, if Enterprise it will rebuild the index online else it. Therefore, you do not need to update statistics after performing ALTER INDEX REBUILD, DBCC DBREINDEX, DBCC INDEXDEFRAG, or ALTER INDEX REORGANIZE operations. 11:33. Create a job to run your index reorganize ('Reorganize'). If we have 10-30% fragmentation a REORGANIZE is performed, and a REBUILD is performed when we have greater than 30% fragmentation. Using above query, you could also query the progress of backup,restore,dbcc command and so on. You have two maintenance commands for indexes: Reorganize. It's better to do reorg on Nightly basis and Rebuild during the weekends. Select the plus sign to expand the Management folder. The Reorganize Index task also includes an option to compact large object data. REORGANZE index - is for reducing fragmentation without index rebuild, so no drop and create. The performance benefit may not be noticeable for indexes that are used primarily for seek operations. it will reorganise it. Online index rebuild higher fragmentation on intermediate level. [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. Last weekend the index maintenance took more than 5 hours and the full backup was running at the same time. If you want to fully automate your SQL Server Index maintenance then I seriously recommend that you check out Michelle Ufford's stored procedure for this. The tool allows you to quickly collect index fragmentation statistics and detect databases that require maintenance. 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. EXEC msdb.