Optimize SQL Server non-clustered indexes and queries by considering index fields, compound indexes and SQL Server statistics. They are also configured from SSMS. The default value for this parameter will be ‘CATALOG’. From Reorganize and Rebuild Indexes. 2. dm_db_index_physical_stats(DB_ID(), NULL, NULL, NULL, NULL) indexstats INNER JOIN sys. – The scripts has some cool features like. I want to reorganize or rebuild indexes. Creating a SQL Server Maintenance Plan. or to reorganize use: ALTER INDEX __NAME_OF_INDEX__ ON. Use the ALTER TABLE command to rebuild the Heap. ALTER INDEX ALL ON Adventureworks. before i answer your question is the database on simple recovery. ;WITH cte AS ( SELECT object_id, index_id, partition_number, rows, ROW_NUMBER () OVER (PARTITION BY object_id, index_id, partition_number. This is great if you want to release some space quickly. It reorgs indexes when fragmentation is below 30% else it rebuild the index. 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. Connection. 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. ALTER INDEX index_name ON table_name REBUILD -- REORGANIZE. index_id > 0 -. Over here it will display all the indexes of the table and you can just click OK. But if you need to change something about an index (that. > 30% ALTER INDEX REBUILD WITH (ONLINE = ON)*. The query processor uses statistics on your data to help determine how. [Product] SET ( ALLOW_PAGE_LOCKS = ON ) ALTER INDEX [PK_Product] ON [Production]. Reorganizing an index uses minimal system resources. A clustered index exists, along with 3 non-clustered indexes. Index should be rebuild when index fragmentation is great than 40%. So far, all good. Usually, you should rebuild the index if it has a fragmentation greater than 30% and reorganize it if it has less than 30% fragmentation. The script will do a reorg if fragmentation goes over 5 %. Rebuilding an index can be either an online operation or an offl ine operation, depending on several factors. name AS IndexName, indexstats. ALTER INDEX TableDetails_UK0 ON TableDetails REBUILD WITH ( PAD_INDEX=OFF, SORT_IN_TEMPDB=ON. Expand the table on which you want to reorganize an index. Rebuild Index. Designing the SQL Server Reorganize Index Task. 6. To create a new job, right click on SQL Server Agent, select New and then Job. The first steps of configuring the Reorganize Index task is quite similar to the Rebuild Index task. SQL Server NULL Index. Rebuilding indexes is done using the following statement. 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。. Execute SQL Server Agent Job. dm_db_index_physical_stats (NULL, NULL, NULL, NULL, NULL); GO. Compaction is based on the existing fill factor value. NAME 'Table name', i. To create a new job, right click on SQL Server Agent, select New and then Job. Jonathan’s right in that fragmentation changes the query plan. WITH (ONLINE=ON). Use Index reorganize option when rate of index fragmentation is b/w 10% to 40%. 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. REORGANIZE seems to work as well as REBUILD all the time. – Ed B. Reorganizing an index uses minimal system resources. 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. if the index has: less than 5% logical fragmentation, don’t do anything. less than 10% logical fragmentation, don’t. Reorganizing is designed to remove logical fragmentation from the leaf level of an index while keeping the index online and as available as possible. You can use Ola's Index maintenance solution or Michelle Ufford's - Index Defrag Script. This might be a good time to stop blindly rebuilding indexes. Over time these modifications can cause the information in the index to become scattered in the database (fragmented). If we have 10-30% fragmentation a REORGANIZE is performed, and a REBUILD is performed when we have greater than 30% fragmentation. First, since you're literally rebuilding the index, it reorders the pages and the rows on those pages. SQL Server Rebuild. ixRebuild @fillfactor int = 100, @Force bit = 0, @Schema varchar (255) = NULL, @Table varchar. I have maintenance job on SQL Server 2012 Enterprise Edition that runs daily to check index fragmentation and reorganize or rebuild the index based on the percentage of fragmentation. It has an IF condition for the Reorganize but i don't need it, i need to modify the code so it queries indexes of a certain database and schema and rebuilds only if the fragmentation is bigger than 5%. You cannot say, “If the index is 45% or more fragmented, rebuild it– otherwise do nothing. Indexes with small number of pages (<1000) will usually. e. 8. How Fragmentation Hurts SQL Server Performance. This task uses the ALTER INDEX REORGANIZE statement with SQL Server databases. Yup, that is one perfectly valid way. 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. before i answer your question is the database on simple recovery. Yes it will - but only to a certain degree. Sorted by: 1. 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. Expand the table on which we want to reorganize the indexes. " But following the Russ's reply the REORGANIZE is a more time expensive operation the REBUILD one. Basically, an index rebuild copies the index to another place. It doesn’t work on the intermediate pages between the root and the leaf. I'm trying to find out how our production database indexes are getting fragmented. 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. Since we are asking SQL Server to rebuild the clustered index on a quite large table twice, it will take a few. Additionally, after reorganizing indexes it is reasonable to update the statistics as this operation does not update the statistics like the index rebuild operation. Disable the indexes on the target table (at least the non-clustered indexes, or NCIs) Insert the new data. For the data (clustered index and heap) you'd have to export outside SQL Server, truncate the table, shrink and then import the data. As a general (widely accepted) rule of thumb is . The size of one of the PK Clustered indexes is greater than 200GB, and for this one a REBUILD. column_name DISABLE; ALTER INDEX. . line is helpful to give the user some indication of what indexes it is rebuilding and how far it has progressed. Hi, We have SQL Server 2005 EE 62 bit with SP3. 2) Extra disk space required during SQL Server online index rebuilds. Best regards, Carrin SQL Server ALTER INDEX Syntax. 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. 35. On a small table just leave it alone. Answers. Highly fragmented, the application performs well. Quick explanation: An online Rebuild, rebuilds the indexes on the tempDB making it available to the queries while it is being rebuilt. However, imagine that you have seven years of data. Rebuild or reindex ?? good question ! Analysis indexes defragmentation RATIO and decide to REORGANIZE OR REBUILD. Hi @Devendra Kumar Sahu , You can perform a reorg or rebuild an index based on its fragmentation values. We have a database server (2016 SQL Server), that we have added a step of 'rebuilding indexes' to the deployment process. 5. Therefore, it'll appear as if there is still fragmentation remaining, as the housing extent will contain pages from multiple indexes. April 1, 2009 at 5:07 am. Select * from sys. 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. Create a execute sql task and schedule it through sql agent . ALTER INDEX ALL ON [dbo]. We will call this stored procedure Maintenance. Frequency of the maintenance should be considered with the goal of minimizing impact of log generation. ALTER INDEX REBUILD on an truncated and therefore empty table serves no purpose, so you need to amend your Plan A. Reorganize: Reorganize indexes with between 11-30 percent fragmentation. My problem is that the reorg is running for a very long time. Hi, The widely used thresholds are: Reorganize if fragmentation is between 10-30%. 3,895 9 51 77. Expand the Indexes. These tables are updated daily. avg_fragmentation_in_percent FROM sys. 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%. Surly not, the Maintenance Plan was created in the current Server itself. As well as maintenance plans, SQL Server Agent jobs are also a handy way to automate and schedule index defragmentation jobs in SQL Server. This is typically how indexes with page level locking disabled get created. Exclusive page locks are taken on individual pages only while those pages are being manipulated. From stackoverflow page ( How Often should the indexes be re-build in sql-server DB?) i got this query : SELECT t. The Reorganize Index task encapsulates the Transact-SQL ALTER INDEX statement. It can be done with online option in enterprise edition. USE AdventureWorks; GO ALTER INDEX ALL ON Production. 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. Does it mean reorganize the file contents maybe. When you rebuild, SQL creates a new fresh index. SQL Server Maintenance plans – Maintenance plans are shipped with SQL Server and are nice for some tasks. This caused the system to reorganize or rebuild. reorganize pages. However, you can create a staging table insert all rows into that, drop original table and rename staging table to original. Applies to: SQL Server. Index should be reorganized when index fragmentation is between 10% to 40%. 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. DROP INDEX when. We need to set these parameters for the job IndexOptimize - USER_DATABASES: @UpdateStatistics = 'ALL'. Ignore: Fragmentation levels of 10 percent or less should not pose a performance problem, so you don’t need to do anything. the. Click the plus sign to expand the table on which you want to rebuild an index online. Oct 6, 2022 at 14:56 "I want to reorganize or. Give it a go with its fully functional 30-day free trial. New. #1162454. 3) SQL Server locks acquired with SQL Server online index rebuilds. Product REBUILD GO Index Reorganize : This process physically reorganizes the leaf nodes of the index. 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. [Test] REBUILD WITH (ONLINE = ON); Additionally, I would only rebuild indexes which require it. dm_db_index_physical_stats (under the Examples -> D section: Using sys. 000. Expand Management in the Object Explorer> Right click Maintenance Plans> Maintenance Wizard> Create Plan for Rebuilding Indexes. For higher fragmentation Rebuild is preferred. With dbForge Index Manager, you can instantly rebuild and reorganize SQL Server indexes in visual mode or generate SQL scripts for future use. Sc (Comp Sci). He has the best practices coded into his scripts, so it should serve you well. •DatabaseBackup: SQL Server Backup •DatabaseIntegrityCheck: SQL Server Integrity Check •IndexOptimize: SQL Server Index and Statistics Maintenance. The reason why too many page splits can decrease the performance of SQL Server is because of the large number of I/O operations. The. " But following the Russ's reply the REORGANIZE is a more time expensive operation the REBUILD one. In SQL Server Management Studio, in Object Explorer, expand the server. The documentation for alter index, for example, shows that it accepts an index_name, not an expression that might evaluate to an index name. dm_db_index_physical_stats fincation have index_id which display heap and index informatiob. Right-click the index you want to reorganize and select Reorganize. The first rebuilds a single index on a table and the second rebuilds all the indexes on the table. It reorgs indexes when fragmentation is below 30% else it rebuild the index. I still see questions about SQL Server 2000/2005 pop up on Stack Exchange. SQL Server also supports nonclustered columnstore indexes. If an index contains less than 100 pages, I will perform no maintenance. 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. 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. This removes fragmentation, reclaims disk space by. When you reorganize an index, SQL Server physically reorders the leaf-level pages to match the logical order of the leaf nodes. As data is added to the table, the free space fills because the fill factor isn't maintained. The entire index has to be read to rebuild it, so there's no reason to do a. You can safely stop it but you need to find out why your database became slow. Does database on which tables reside have database owner. 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. In SQL Server, the ALTER INDEX statement is used to modify an existing index. Best regards,. Product REORGANIZE GO. 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. Create a new server connection to use when performing this task. First, we will start the index reorganization in a session using the following T-SQL code. Expand the Management folder. sql to our customers's SQL Server instance. It drops index entirely and creates it from scratch. some action needs to be taken to remove the ghosted records. OBJECT_ID) AS TableName, ind. 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. When you rebuild an index, SQL Server actually resorts the data of the index and uses a new set of index pages. Reorganizing also compacts the index pages. Remarks. dm_db_index_physical_stats DMV to identify the fragmentation. That can be found using the STATS_DATE function. . Expand the Indexes folder. 2. Using above query, you could also query the progress of backup,restore,dbcc command and so on. Reorganizing an index is a faster, lightweight version of rebuilding and the indexes remain online. For more information about this enhancement, check the SQL Server 2016. Mar 8, 2021, 2:47 PM. Rebuild/Reorganize working fine. [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 Rebuild Index task similarly bulldozes through everything and rebuilds every index, without checking fragmentation. index_type_desc AS IndexType, indexstats. We have an arguments saying Index rebuild not required if page count <1000 in MS SQL server. It is causing other queries to wait, even simple ones like: SELECT * FROM tableName WHERE indexedColumn = @value. Defragmentation in Practice. 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. The performance benefit may not be noticeable for indexes that are used primarily for seek operations. ALTER INDEX All ON tableName REORGANIZE;The minimum permission to create/alter index can be easily found in corresponding BOL articles CREATE INDEX (Transact-SQL) and ALTER INDEX (Transact-SQL):. I'd just add that adding the line PRINT @sql after the SET @sql =. We will use 3 statements in order to show the blocking: ALTER INDEX. Also trying to avoid logging to transaction log and log. Script to reorganize all indexes on all tables in user databases. Index Rebuild vs Index Reorganize. This means there is only 140-ish byte free per page. Find and remove unused indexes – everything that is unused doesn’t do anything good. The best practice recommendation is to reorganize your index if you have 5-30% of fragmentation, and only rebuild it if it has more than 30% fragmentation. This procedure automatically chooses whether to rebuild or reorganize an index according to its fragmentation level, amongst other parameters, and update statistics. CREATE PROCEDURE dbo. For information about how to maintenance index, refer to MS document. Index rebuilds (not index reorganise) always do a fullscan update of the statistics. you are reading your query result incorrect. x) 以降) および Azure SQL データベース における列ストア インデックスの場合、REORGANIZE では、次の追加のデフラグ最適化がオンラインで実行されます。 行の 10% 以上が論理的に削除されたとき、行グループから行を物理的に削除します。Also when I try to reorganize or rebuild manually, using one of the following commands: use DBNAME. index rebuild/reorganize frequency. REORGANIZE can take much longer than REBUILD, but if you have no choice, you have to go with it. The purpose is to reduce the size of database and increase the db performance. To fix the fragmentation either rebuild or reorganize the index on the table. 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. There are two ways of doing that: (i) by using the ‘ DBCC SHOWCONTIG ‘ command, and (ii) by using the ‘ sys. e check fragmentation and take an appropriate action. We leave default values here as well. ALTER INDEX CCI_TEST on DBO. indexes. object_id =. Still, non-clustered indexes will be left to rebuild/reorganize occasionally, but they are much smaller than table itself. – variable. Reorganize Index Task Forum – Learn more on SQLServerCentral. T-SQL Alter Index. 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. An index rebuild will always build a new index, even if there’s no fragmentation. In it, enter the Job name, owner, optionally Category. The Reorganize Index task also includes an option to compact large object data. Select the plus sign to expand the Management folder. 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. Drag and drop the index rebuild task from the maintenance plan toolbox. Quick explanation: An online Rebuild, rebuilds the indexes on the tempDB making it available to the queries while it is being rebuilt. Starting with SQL 2005 master keeps very little info regarding server configs and logins. 1 Answer. You can always update statistics on their own. 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. The execute sql task should contain the index rebuild code along with stats rebuild . Once you select that option it will bring up the following screen. However, a new database server backed with Intel PCIe SSDs is showing the opposite of what we expect. 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. The index it is running against is 78% fragmented. Options. The indexes that cannot be rebuild online are: Disabled clustered index ; Disabled indexed view1. We can also run the task by running the corresponding job in SQL Server Agent. Select Allow online DML processing, and then select True from the list. line is helpful to give the user some indication of what indexes it is rebuilding and how far it has progressed. Jan 11 at 14:24. In this article. I don't think Windows SQL Server Maintenance has this option yet. This index uses column-based data storage and query processing to achieve gains up to 10. If the page_count is less than 1000 (or whatever you decide) then you should ignore the index. Or if it swapping places of two pages. Bad internal fragmentation (having lots of free space on the pages) means the index is bigger than it needs to be. Rebuilds are generally faster. Sorry No idea why this happened. All versions of SQL Server 2008 Management Studio create the index with page level locking enabled by. USE AdventureWorks; GO ALTER INDEX ALL ON Production. 11:33. Reorganizing an index only deals with the fragmentation that exists, and the more fragmentation there is, the longer a reorganize will take. #969726. However, none of the other metrics appear to indicate that the system is. If you use Ola Hallegren's scripts then you can set the thresholds for a rebuild/reorganise (say over 50% fragmentation for a reorganise, over 80% for a rebuild) and this can run overnight out of hours. Bulk amount records are deleted and updated frequently. In SQL Server, when rebuilding an index which previously had statistics updated with PERSIST_SAMPLE_PERCENT, the persisted sample percent is reset back to default. Statistics on indexes automatically get updated. You could also refer another query which may be helpful to you. When reorganizing an index, SQL Server acquires an Intent-Exclusive lock on the index B-tree. SQL Server also supports nonclustered columnstore indexes. Expand Tables. August 1, 2013 at 3:52 pm. It is causing other queries to wait, even simple ones like: SELECT * FROM tableName WHERE indexedColumn = @value. The fill factor determines the amount of empty space on each page in the index, to accommodate future expansion. Execute SQL Server Agent Job. ALTER INDEX CCI_TEST on DBO. Less than 10% - then do nothing; between 10% and 30% - then do a reorg; more than 30% - then rebuild them. Then, drag and drop Rebuild Index Task into the maintenance plan designer. In Object Explorer, Expand the database that contains the table on which you want to reorganize an index. SQL Server does not maintain when an Index was last rebuild, instead it keeps information when stats were last updated. It doesn't work the way you think it does. 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. A page is a small section of a database, typically an 8kb chunk. 1. Last weekend the index maintenance took more than 5 hours and the full backup was running at the same time. From Reorganize and Rebuild Indexes. 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. RDS for SQL Server doesn't have maintenance plans that automatically create plans and jobs to rebuild or reorganize indexes. dm_os_performance_counters where counter_name = 'page splits/sec'. Therefore you do not need to update statistics OR reorganize an index if it gets rebuilt. As well as maintenance plans, SQL Server Agent jobs are also a handy way to automate and schedule index defragmentation jobs in SQL Server. MyTable REORGANIZE WITH(LOB_COMPACTION = ON). The REORGANIZE modifier for ALTER INDEX is not currently supported by Azure SQL. ;WITH cte AS ( SELECT object_id, index_id, partition_number, rows, ROW_NUMBER () OVER (PARTITION BY object_id, index_id, partition_number. 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. 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. x) implemented major performance improvements for these index operations. Index should be reorganized when index fragmentation is between 10% to 40%. 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. #969726. So far, all good. This had a negligible impact. When you reorganize an index, SQL Server sorts the index pages and releases the unused space within the index pages. 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. Create jobs to automate maintenance – create a SQL Server Agent job that will automate SQL index maintenance. Both create/rebuild of columnstore index is an OFFLINE operation at this time but you can defragment columnstore index ONLINE. Factors to consider while Rebuild/Reorganize of index in SQL Server 2012. Approved By Raja Jegan R Updated on October 18, 2023 Min Reading 4 Min Summary: MS SQL Server chooses not to use an index when it becomes fragmented. REORGANIZE, UPDATE STATISTICS and a simple SELECT statement. Last night I killed the REORG on the clustered index after almost 6 hours of execution. You can even stagger which indexes get rebuilt when and perhaps pick the top N index, based on fragmentation level, and REORGANIZE a certain number of them each night. "There are a variety of mechanisms for rebuilding indexes. ALTER INDEX [PK_SalesOrderDetailEnlarged_SalesOrderID_SalesOrderDetailID] ON [Sales]. Untuk informasi selengkapnya, lihat panduan arsitektur dan desain indeks SQL Server. Next the New Job window will open. I have many DBs that are currently used for insert and delete. This. 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. In this article. For now, I have just turned off the weekly index reorganize task which is not really a good long term solution. (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. Index in SQL Server . However, my SQL Server license is Standard and I can't rebuild indexes online. SQL Server 2005 Index Rebuild/Reorganize. #4156024. Mohamad Mahmoud Darwish. There are two ways to set fillfactor in SQL Server: At the SQL Server instance level using a sys. Therefore, focus on the larger indexes because their pages are less likely to be cached by SQL Server. it will reorganise it. To reorganize index SQL Server, right-click it & choose Reorganize. 7. If your indexes are fragmented : If index has less than 1000 pages - do not perform any index maintenance operation. Using above query, you could also query the progress of backup,restore,dbcc command and so on. 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. SQL Server development version and Enterprise version has option ONLINE, which can be turned on. Index Maintenance is one of the major task for a DBA. ALTER INDEX [myIndex] ON [dbo]. Dalam indeks rowstore, SQL Server mengimplementasikan pohon B+. x) and later. Index Rebuild : This process drops the existing Index and Recreates the index. 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. " Disagree with this as I have a system in. . When using columnstore indexes, the delta store may end up with multiple small row groups after inserting, updating, and. 1. The index front is stable, no change. Ideally , microsoft suggests that reorganize should be used for index fragmentation between 5 and 30 % and rebuild for > 30%May 5, 2010 at 8:00 am. In this case you can perform index reorganize and index rebuild operations only on those partitions that really need it, thus making it more efficient by reducing the time and resources needed for this maintenance. Updating statistics is important for query processing and optimization. The script uses the following parameters: @reportOnly (required) Values: - 0: The script will reorganize or rebuild the fragmented 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 doing an index. The problem is that the size is getting out of control, I can see up to 99% fragmentation in the Primary Key clustered indexes. You can read more on rebuilding indexes here . Designing the SQL Server Reorganize Index Task. TRUNCATEONLY is applied which prevents the SQL server from performing any data reorganising. Reorganizing is designed to remove logical fragmentation from the leaf level of an index while keeping the index online and as available as possible. But commit your whole transaction before reorganize. Select the server connection to use when performing this task. And they really shouldn't be because you're using Standard Edition - and parallel index operations are an Enterprise Edition feature.