Quick explanation: An online Rebuild, rebuilds the indexes on the tempDB making it available to the queries while it is being rebuilt. ALTER INDEX [PK_SalesOrderDetailEnlarged_SalesOrderID_SalesOrderDetailID] ON [Sales]. ALTER INDEX [PK_SalesOrderDetailEnlarged_SalesOrderID_SalesOrderDetailID] ON [Sales]. Rebuild or Reorganize SQL Index. If the underlying table is a clustered index, then for the CI and all non-clustered indexes both rebuild and reorganize are available. Yes it will - but only to a certain degree. It is compatible with all versions of SQL Server 2005 , 2008 , 2012 , 2014 and 2016. -Search all indexes of a table that have 5% or more of fragmentation and page_count >= 1000. 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. I made them up. 1. How Fragmentation Hurts SQL Server Performance. Here is a procedure what I wrote. We leave default values here as well. : 15% com. To fix the fragmentation either rebuild or reorganize the index on the table. 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. If an index contains less than 100 pages, I will perform no maintenance. If we then try to reorganize this index. Hi Team, Today when I go through some of the SQL Server performance videos, found one interesting video (Please find the link below), where he said that rebuilding indexes is a very expensive thing and it will clear the cache every time an index rebuild happens, (It means that we indirectly killing the SQL Server everything we. Proceed to the Steps tab: Clicking on New. 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. You can add a rebuild index task or reorganize index task into the maintenance plan, but the problem is that you can't really apply any logic to the plan. That's why as a rule of thumb, for fragmentation greater than about 30%. May be index was not there, may be you were just rebuilding the index. First it’ll try an index reorganize, which is an online operation. dm_tran_database_transactions DMV:SQL: Procedure for rebuild and reorganize indexes like Microsoft says. Here's another script to add to the list. avg_fragmentation_in_percent FROM sys. Indexes are created on columns in tables or views and provide a quick way to look up data based on the values of those columns. Just kidding – although the evidence does point to that. I suspect the reorganize is compacting the index after the rebuild and thus moving quite a bit of data around. Speaking for SQL Server, I tend to choose a index size and index fragmentation level at which point I begin performing index maintenance. Use the page count reported by DBCC SHOWCONTIG to get an idea of the size of the indexes (each page is 8 KB in size). 0. 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. The syntax for rebuilding indexes is very simple, we just add the "WITH ONLINE=ON" clause to the ALTER INDEX command. To solve this, I want to use the REORGANIZE operation every time. It is compatible with all versions of SQL Server 2005 , 2008 , 2012 , 2014 and 2016. Speaking for SQL Server, I tend to choose a index size and index fragmentation level at which point I begin performing index maintenance. Microsoft best practice says that you should generally not do a rebuild operation unless fragmentation is over 30%. 1. or to reorganize use: ALTER INDEX __NAME_OF_INDEX__ ON. FullTextIndexOptimize. Even though this is an online activity, you. Use Index reorganize option when rate of index fragmentation is b/w 10% to 40%. USE AdventureWorks; GO ALTER INDEX ALL ON Production. With SQL Server 2005 you have the option of rebuilding or reorganizing your indexes. @OnlyModifiedStatistics = 'Y'. I used the sp_who2 procedure to see which queries were waiting, and which other query they were blocked by. You can use Ola's Index maintenance solution or Michelle Ufford's - Index Defrag Script. So far, all good. DBCC DBREINDEX rebuilds an index for a table or all indexes defined for a table. It is causing other queries to wait, even simple ones like: SELECT * FROM tableName WHERE indexedColumn = @value. Deletes catalog and creates new. This would also keep the original order of columns. 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. index rebuild/reorganize frequency. 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). We recently switched to Ola Hallengren's maintenance script and automated the deployment of MaintenanceSolution. indexes. After rebuilding indexes, the application performs badly. 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。. index_type_desc,. 7. Product REORGANIZE GO. Here are a couple of examples. SQL Server Rebuild. Once you select that option it will bring up the following screen. The discussion of columnstore indexes thus far has focused on clustered columnstore indexes that target a primarily OLAP workload. This happens approx. 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. I am not sure I am picturing this correctly. Larger indexes have more intermediate levels and pages. The performance benefit may not be noticeable for indexes that are used primarily for seek operations. Both versions allow you to specify the. index_id > 0 -- Indexes. I used the sp_who2 procedure to see which queries were waiting, and which other query they were blocked by. The purpose is to reduce the size of database and increase the db performance. Online & Offline Index Rebuild. Rebuild Index. It defragments the leaf level of clustered and nonclustered indexes on tables and views by physically. Table locks alone would not make sense, the point with REORGANIZE is that the table is mainly online while the operation is running. I'm currently using the approach described here: sys. Reorganizing only works on the leaf pages. 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%. If you search for index rebuilding, you will find many complex scripts on the web, but this can also be done. Pay attention to execution time though. Shrink File. Syntax ALTER INDEX index_name ON table_name. 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. I'm able to rebuild all other indexes with online=on option and it won't affect performance. Remarks. Next the New Job window will open. Check the column, avg_fragmentation_in_percent and if its greater than. . 11. SQL Server Maintenance plans – Maintenance plans are shipped with SQL Server and are nice for some tasks. The scripts has some cool features like. 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. 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. To create a new job, right click on SQL Server Agent, select New and then Job. Sysjobhistory index "nc1" that is on job_id, its fragmentation does not go less than 66. 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. REORGANIZE seems to work as well as REBUILD all the time. Create an agent WMI alert ('Reorganize Relief Valve') on a performance condition. A table may only have one columnstore index on it at a time, regardless of whether it is clustered or nonclustered. INDEX_REORGANIZE Reorganizes the index. Note that the time it takes to complete the operations depends on the size of the database and how fragmented the indexes. This means you can grant alter table on every table of interest that already exists. Best regards,. - 1: The script will just output the index reorganization or rebuild commands without running them. Yes. REORGANIZE seems to work as well as REBUILD all the time. 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. Reorgs defragment the leaf level of clustered and. It will have a parameter called @MaintenanceMode that can be set to either ‘INDEX’ or ‘CATALOG’ in order to choose the way we want to maintain our Full-Text indexes. The REORGANIZE modifier for ALTER INDEX is not currently supported by Azure SQL. The process uses the existing pages only and does not allocate new ones, but it does compact the index pages. DBCC DBREINDEX - use to re-index with older versions (SQL Server 2000 and earlier) sys. Some operations that took ~90s now take ~6mins. > 30% ALTER INDEX REBUILD WITH (ONLINE = ON)*. 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. The MSDN page says this about reorganizing and rebuilding indexes: The SQL Server Database Engine automatically maintains indexes whenever insert, update, or delete operations are made to the underlying data. If the index is disabled, rebuilding brings it back to life. The first steps of configuring the Reorganize Index task is quite similar to the Rebuild Index task. 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. If we have 10-30% fragmentation a REORGANIZE is performed, and a REBUILD is performed when we have greater than 30% fragmentation. Reorganize does not holds blocking locks. For more information about this enhancement, check the SQL Server 2016. Check indexes from the index grid and click desired defragment operation from the ribbon. For a turnkey solution, you may refer to Microsoft MVP Ola Hallengren's SQL Server Index and Statistics Maintenance. Below the last two rows that displays the fail: Source: Reorganize Index Executing query "ALTER INDEX [PK_xxTableName] O. TEST REORGANIZE We get our open delta store again, which will cause locking. avg_page_space_used_in_percent column in the sys. First, since you're literally rebuilding the index, it reorders the pages and the rows on those pages. As visible in the above image, REBUILD and REORGANIZE are the two available choices to play out the trim operation over the page. During index optimization, nothing accesses the server other than Red Gate SQL Monitor. In addition, reorganization uses minimal resources and is automatically performed online, without. 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. REORGANIZE can take much longer than REBUILD, but if you have no choice, you have to go with it. The first rebuilds a single index on a table and the second rebuilds all the indexes on the table. 3) SQL Server locks acquired with SQL Server online index rebuilds. Thanks for your reply. It doesn’t work on the intermediate pages between the root and the leaf. REORGANZE index - is for reducing fragmentation without index rebuild, so no drop and create. SQL. Reorganizing an index uses minimal system resources. It reorgs indexes when fragmentation is below 30% else it rebuild the index. Reorganizing only works on the leaf pages. Reorganizing tries to put the leaf level of the index back in logical order within the pages that are already allocated to the index. Less than 10% - then do nothing; between 10% and 30% - then do a reorg; more than 30% - then rebuild them. So I ran reorganize indexes and that took care of the fragmentation problem. When a table has multiple indexes, create the clustered index first, then the nonclustered. Is this possible to do? Creating a SQL Server Maintenance Plan. Disk space is an important consideration when you create, rebuild, or drop indexes. Rebuild Indexes. Modifying a SQL Server Maintenance Plan. CREATE INDEX IX_DisplayName ON dbo. ”. 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. . Yes. Identify and remove index fragmentation – this is obviously what we have been talking until now and the biggest part of the SQL index maintenance. One option is to execute an index rebuild, which will move data around on pages. Index Reorganize During Database Full Backup. allocation_units. I don't think Windows SQL Server Maintenance has this option yet. If your indexes are fragmented : If index has less than 1000 pages - do not perform any index maintenance operation. We will use 3 statements in order to show the blocking: ALTER INDEX. 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. Consider dropping the index, inserting the data, and then rebuilding the index. Hallengren website has an option to reorganize indexes say with 5% Fragmentation, and rebuild for 30% Fragmentation. 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. Starting from SQL Server 2016, new options were added to the index maintenance tasks that allow us to perform the Rebuild Index and Reorganize Index tasks, based on the fragmentation percentage of the index, and other useful options to control the index maintenance process. 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. As a good start, read these: Rebuild or Reorganize: SQL Server Index Maintenance (Kendra Little)“Reorganize” index option. The script will do a reorg if fragmentation goes over 5 %. 8. Hi @Devendra Kumar Sahu , You can perform a reorg or rebuild an index based on its fragmentation values. The link points to SQL Server 2014 docs, but the syntax should work on 2005 and 2008 as well. It is used when the operation takes a. Otherwise you're holding an exclusive lock on the table/partition before you start the reorganize. Below the last two rows that displays the fail: Source: Reorganize Index Executing query "ALTER INDEX [PK_xxTableName] O. 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. Use the ReorganizeIndex Task dialog to move index pages into a more efficient search order. 2,057 11 22. 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. Expand the Indexes. partition_number The number of an existing index partition to rebuild/reorganize. 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. 2. If your indexes are fragmented : If index has less than 1000 pages - do not perform any index maintenance operation. In it, enter the Job name, owner, optionally Category. . I am getting confused with choosing Index Reorganize/Rebuilding of indexes based on avg_fragmentation_in_percent returned by sys. I'm just using the reorg index task that is in the maintenance plan designer GUI. Rebuilds automatically run statistics on your indexes. ALTER INDEX TableDetails_UK0 ON TableDetails REBUILD WITH ( PAD_INDEX=OFF, SORT_IN_TEMPDB=ON. Ignore anything with less than 15-20 pages. In the New Maintenance Plan dialog box, in the Name box, type a name for the plan and select OK. Bulk amount records are deleted and updated frequently. As per followed practice you can rebuild index when fragmentation is >30 % and can reorganize when fragmentation is between 10 and 30 %. 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. You should also include page_count value in your query. The fi rst factor is whether you have SQL Server Standard Edition or SQL Server Enterprise Edition. To create a linked server to azure, you can see this SO link:I need to add a linked server to a MS Azure SQL ServerSelect “reorganize index” and “rebuild index. dbo. I used this approach to improve performance and it worked perfectly for a long time. March 2, 2023 at 3:05 pm. When you create or rebuild an index, by setting the SORT_IN_TEMPDB option to ON you can direct the SQL Server Database Engine to use tempdb to store the intermediate sort results that are used to build the index. You can also change this threshold via parameters. Surly not, the Maintenance Plan was created in the current Server itself. A table may only have one columnstore index on it at a time, regardless of whether it is clustered or nonclustered. 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. Last weekend the index maintenance took more than 5 hours and the full backup was running at the same time. Indexes play a vital role in the performance of SQL Server applications. Provide the appropriate name of the maintenance plan. For information about how to maintenance index, refer to MS document. SQL Server, MVP, M. Reorganizing an index is a faster, lightweight version of rebuilding and the indexes remain online. 1. In SQL Server, you "might" run into issues with "updating primary key". SQL Server provides sys. This tool provides index analysis to manage index defragmentation, including rebuild and reorganize fragmented indexes . 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. ALTER FULLTEXT CATALOG [CatalogName] REBUILD. So you should explicitly set a deadlock priority, and perhaps a retry loop, to enforce the behavior and document it. 3. Reorganizing an index uses minimal system resources. This tip will explore two features to speed up SQL Server index and statistics maintenance. Creating a SQL Server Maintenance Plan. This means there is only 140-ish byte free per page. I know the sql to perform this action on all indexes in a table is. This REBUILD option is available in SQL Server 2008 onwards. I'd just add that adding the line PRINT @sql after the SET @sql =. 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. Any helps to me, please? Thanks · REORGANIZE is always an online operation, that is, it does not block. "There are a variety of mechanisms for rebuilding indexes. – Ed B. Starting with SQL 2005 master keeps very little info regarding server configs and logins. This is fixed in later service packs of SQL Server 2005 Management Studio. Therefore you do not need to update statistics OR reorganize an index if it gets rebuilt. Rebuildes only indexes on one of the tables. The first part of this tip focuses on SQL Server Enterprise Edition to reduce the duration for index maintenance for off-line rebuilds. First, we will start the index reorganization in a session using the following T-SQL code. This to me would be a sign that constant rebuilds of that index actually aren't a good help. 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、. Another option is to manually run sp_clean_db_free_space (to clean all database data files) or sp_clean_db_file_free_space (to clean a single database datafile), which will delete. SQL Server index fragmentation is unavoidable, but you can minimize the negative effects of fragmentation on database performance. WITH (ONLINE=ON) causes locking. dm_db_index_physical_stats) is <1000 you don't need to rebuild or reorganize such. 7. Give it a go with its fully functional 30-day free trial. DECLARE. April 1, 2009 at 5:07 am. This will invoke the Tuple Mover , which will turn closed delta stores into compressed rowgroups. DBCC DBREINDEX rebuilds an index for a table or all indexes defined for a table. . This means loading the table and building all nonclustered indexes before moving on to the next one. I'm able to rebuild all other indexes with online=on option and it won't affect performance. It's so bad on indexes that fragment that it's actually the cause of the myth of Random GUID Fragmentation. This caused the system to reorganize or rebuild. Dokumentasi SQL Server menggunakan istilah pohon B umumnya dalam referensi ke indeks. 1. 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. Also, running UPDATE STATISTICS gets you both index and columns stats updates. Rebuild if > 30%. It drops index entirely and creates it from scratch. The first rebuilds a single index on a table and the second rebuilds all the indexes on the table. Or considering avoiding index rebuilds in favor of statistics updates. The Rebuild Index task similarly bulldozes through everything and rebuilds every index, without checking fragmentation. dbForge Index Manager for SQL Server will. The documentation is also indicating that: Online index operations are not available in every SQL Server edition. 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. Large object data is data with the image, text, ntext, varchar (max), nvarchar (max), varbinary (max), or xml data type. Product REBUILD GO Index Reorganize : This process physically reorganizes the leaf nodes of the index. dm_db_index_physical_stats dm function. Rebuild or Reorganize SQL Index. @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. REORGANIZE cannot be specified for a disabled index or. Reorganize Index. There are a number of differences. I have many DBs that are currently used for insert and delete. But no help, the rebuild itself not working. 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. But the index is updating itself properly. Enable Row Level and Page Level Locks. By using the Rebuild Index task, a package can rebuild indexes in a single. The index uses the main filters on the sales table from the time dimension, i. The simple reason which comes to my mind is rebuild should be done only when index is fragmented. 5. An index reorganize can be interrupted and the worst that will happen is that a single page move operation is rolled back. Yes. Does database on which tables reside have database owner. If you want to rebuild an index the syntax is below: ALTER INDEX. My problem is that the reorg is running for a very long time. Regards. Drag and drop the index rebuild task from the maintenance plan toolbox. Suggest you investigate alternatives, such as [Ola Hallengren's SQL Server maintenance tools][1] - free to use. We should reorganize indexed with. sql to our customers's SQL Server instance. DROP INDEX when. Expand Tables. dm_db_index_physical_stats (NULL, NULL, NULL, NULL, NULL); GO. Paul Randal. Designing efficient indexes is paramount to achieving good database and. Recall the paper example from above: a rebuild would be like reprinting the document in the correct order and trashing the old ones. If the index’s design doesn’t allow for that, IndexOptimize will try to rebuild the index online. 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. REBUILD will not just rebuild index, but also force update of corresponding statistics. However, you can create a staging table insert all rows into that, drop original table and rename staging table to original. Highly fragmented, the application performs well. Additionally, after reorganizing indexes it is reasonable to update the statistics as this operation does not update the statistics like the index rebuild operation. Compaction is based on the existing fill factor value. 1. If you cancel a rebuild operation midway, it. The discussion of columnstore indexes thus far has focused on clustered columnstore indexes that target a primarily OLAP workload. The query processor uses statistics on your data to help determine how. configurations setting for fill factor. The Reorganize Index task encapsulates the Transact-SQL ALTER INDEX statement. Bad internal fragmentation (having lots of free space on the pages) means the index is bigger than it needs to be. ALTER INDEX index_name ON table_name REBUILD -- REORGANIZE. dm_db_index_physical_stats (under the Examples -> D section: Using sys. Note: You cannot reorganize an index (primary key, or unique key) that has an Allow Page Locks. The first and most popular method is to rebuild indexes. Maybe I am reading a different article - but what you linked to is actually worse. Backup Up Database (Full) 4. The documentation for alter index, for example, shows that it accepts an index_name, not an expression that might evaluate to an index name. You should intelligently do index reorg and rebuilds. REORGANIZE [ WITH ( LOB_COMPACTION = { ON | OFF } ) ] Applies to: SQL Server 2016 (13. Bulk amount records are deleted and updated frequently. REORGANIZE Tells SQL Server to perform a master merge, which involves merging the smaller indexes created in the process of indexing into one large index. ALTER INDEX ALL ON [table_name] REORGANIZE; However, if you want to rebuild all the indexes on the table, you can run the following. dm_db_index_physical_stats ‘ Dynamic Management View (DMV). 1. Ignore: Fragmentation levels of 10 percent or less should not pose a performance problem, so you don’t need to do anything. ALTER INDEX ALL ON [dbo]. The Reorganize Index task reorganizes all indexes, regardless of fragmentation level. This tool provides index analysis to manage index defragmentation, including rebuild and reorganize fragmented indexes . Yes, just the table and any query that tries to access that table. In decades of working with MS SQL Server at a many companies, I've never ONCE had to rebuild the indexes in order to fix a performance problem. REORGANIZE, UPDATE STATISTICS and a simple SELECT statement. And if it is a clustered index, the entire table is copied. 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. This. 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 is a best practice for performance when you rebuild or reorganize indexes. x) and in Azure SQL Database, we recommend using ALTER. If the page_count is less than 1000 (or whatever you decide) then you should ignore the index. When you reorganize the index, you go through the existing index, cleaning up blocks for deleted records etc. Additionally, after reorganizing indexes it is reasonable to update the statistics as this operation does not update the statistics like the index rebuild operation. . Partitions can be rebuilt individually. 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. Let’s move on to creating the Reorganize Index task via the Maintenance Plans and then Update Statistics task. Jan 11 at 14:24. " But following the Russ's reply the REORGANIZE is a more time expensive operation the REBUILD one. 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. 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. SQL. The problem is that the size is getting out of control, I can see up to 99% fragmentation in the Primary Key clustered indexes. This is typically how indexes with page level locking disabled get created. An index rebuild operation cannot be interrupted without it rolling back everything it’s done so far – it’s atomic – all or nothing. The following example returns all statistics for all tables and indexes within the instance of SQL Server by specifying the wildcard NULL for all parameters. – variable. In the Name box, enter the name of the maintenance plan you're creating. In the Description box, briefly describe your maintenance plan. 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):. 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. A few thing to consider: Can you insert the data in the order of the index? This will reduce fragmentation. Index rebuilding and reorganizing are the two methods to maintain indexes and improve database performance. Over time these modifications can cause the information in the index to become scattered in the database (fragmented). Index rebuilding process uses more CPU and it locks the database resources. #1162454. 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. Here are a couple of examples. Rename. After month the same query took up to 20-30 s. indexes. Reorganizing an index only deals with the fragmentation that exists, and the more fragmentation there is, the longer a reorganize will take. ALTER INDEX ALL ON [dbo].