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. Reorganizing an index is always an online operation, and it can be stopped at any time. To create a new maintenance plan, right click on Maintenance Plan and select New Maintenance Plan and the following window will open. Rebuilding an index means that a whole new set of pages is allocated for it. However, my SQL Server license is Standard and I can't rebuild indexes online. ALTER INDEX . Rebuilding an index can be executed online or offline. The more the fragmentation you need to rebuild if its less you can reorganize. [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. x), you can create nonclustered B-tree or rowstore indexes as secondary indexes on a clustered columnstore index. Coming to update stats, I would prefer to do it with Full Scan depending on the size of the databases. It should not be used on WSUS 2. How Fragmentation Hurts SQL Server Performance. Identifies indexes that are fragmented and defragments them. Click the plus sign to expand the Tables folder. The SQL Server instance should have enough memory available to hold the largest table and perform the largest nonclustered index sort at the same time. Your new index will have the size non less than the size of disabled index. A clustered table provides a few benefits over a heap such as controlling how the data is sorted and stored, the ability to use the index to find rows quickly and the ability to reorganize the data by rebuilding the clustered index. Reorganizing the indexes will take less time, and less effort from the SQL server thus they can be done in a weeknight type of instances. Rebuild if > 30%. T-SQL Alter Index. dm_exec_requests to see how much longer your query has to finish. Once you select that option it will bring up the following screen. Someone else set it up. USE AdventureWorks2022; GO -- The following example updates the statistics for all indexes on the. Improve this answer. Mine might be such a scenario. In SQL Server, you "might" run into issues with "updating primary key". Don’t shrink your database files just to free up drive space. Find and remove unused indexes – everything that is unused doesn’t do anything good. The syntax for rebuilding indexes is very simple, we just add the "WITH ONLINE=ON" clause to the ALTER INDEX command. Therefore, focus on the larger indexes because their pages are less likely to be cached by SQL Server. For a dedicated SQL pool table with an ordered CCI, ALTER INDEX. However, these numbers are only for general guidance as a starting point for your environment. Use the Rebuild Index Task dialog to re-create the indexes on the tables in the database with a new fill factor. [Subscribers] REBUILD GO Rebuilding all indexes in a table USE [SQLMaestros] GO ALTER INDEX ALL ON [hol]. Click Next, and you can define the Update Statistics task. This could be further tweaked to handle only indexes that need maintenance based on fragmentation levels as well as then doing either an index reorg or an index rebuild. Er…. As data is added to the table, the free space fills because the fill factor isn't maintained. Therefore, you do not need to update statistics after performing ALTER INDEX REBUILD, DBCC DBREINDEX, DBCC INDEXDEFRAG, or ALTER INDEX REORGANIZE operations. ALTER INDEX [myIndex] ON [dbo]. The alternative is to do an index reorganize, either using my old DBCC INDEXDEFRAG or the new ALTER INDEX. dm_db_index_physical_stats) is <1000 you don't need to rebuild or reorganize such. We are planning to run index rebuild/reorganize on a regular basis in our application. The purpose is to reduce the size of database and increase the db performance. 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. Using SQL Server Management Studio: In the Object Explorer pane navigate to and expand the SQL Server, and then the Databases node Expand the specific database with fragmented index Expand the Tables node, and the table with fragmented index Expand the specific table Expand the Indexes node. You can do maintenance in phases, where each maintenance phase covers a subset of. before i answer your question is the database on simple recovery. If you cancel a rebuild operation midway, it. But if you need to change something about an index (that. Reorganize Index Task Forum – Learn more on SQLServerCentral. 4. You will often see advice to perform a REBUILD on highly-fragmented indexes, rather than a REORGANIZE-- This is because rebuilding from scratch can be more efficient. @LeeWalters shrink is done, and yes, due to disk issues, not possible to add drives, that's why, in addition, db is populated with blob data, so the question is more from the index fragmentation side. The Microsoft Docs page for SQL Server statistics states: Operations such as rebuilding, defragmenting, or reorganizing an index do not change the distribution of data. 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. If you what you are saying is true, even reorganizing the indexes that have never been, may. ) Index Size is greater than 5 MB's. Rebuild drops. - the index depth is more then 4 levels. I used the sp_who2 procedure to see which queries were waiting, and which other query they were blocked by. Instead of our phone book having 1,000 pages that are 100% full, we might have 1100 pages that are only 90% full. indexstats. I have an index on a . On the Standard bar, click New Query. Default SQL Server value is 0 or 100%, which means that no free space should be left on each page. USE AdventureWorks; GO ALTER INDEX ALL ON Production. In order to resolve the index reorganization issue, we will enable the row and page level locking by altering the index as shown below: USE MSSQLTipsDemo GO ALTER INDEX [PK_Product] ON [Production]. You can query the sys. Create an agent WMI alert ('Reorganize Relief Valve') on a performance condition. It's better to do reorg on Nightly. 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. Index rebuilding and reorganizing are the two methods to maintain indexes and improve database performance. A spatial index can be created using the following syntax: CREATE TABLE MySpatialTable (id int primary key, geometry_col. This procedure automatically chooses whether to rebuild or reorganize an index according to its fragmentation level, amongst other parameters, and update statistics. There’s no hard and fast rule here but I generally say where. The simple reason which comes to my mind is rebuild should be done only when index is fragmented. When fragmentation is above 30%, rebuild the index. 4) Move database back to full recovery mode. Yup, that is one perfectly valid way. The documentation for alter index, for example, shows that it accepts an index_name, not an expression that might evaluate to an index name. ALTER INDEX index_name ON table_name REBUILD -- REORGANIZE. Reorganizing an index uses minimal system resources. The alternative for online rebuilding is to create a new index using CREATE INDEX CONCURRENTLY, then drop the old. More actions. This sample T-SQL script performs basic maintenance tasks on SUSDB 1. Rebuild if > 30%. MS advises using Reorganize for 30%. In an MS-SQL Server. Larger indexes have more intermediate levels and pages. . Near the top of the script, around line 32, you will see a line of Transact-SQL code that looks like this: 1. The execute sql task should contain the index rebuild code along with stats rebuild . Ignore: Fragmentation levels of 10 percent or less should not pose a performance problem, so you don’t need to do anything. – Ed B. I don't think Windows SQL Server Maintenance has this option yet. SQL Server 2005 Index Rebuild/Reorganize. 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. So far, all good. Thank you, ShamAnswers. Reorganizing an index is always executed online. Q23: What is the difference between index Rebuild and Index Reorganize operations? Index fragmentation can be resolved by rebuilding and reorganizing SQL Server indexes regularly. #1162454. Offline Rebuilding: This is faster but makes the database unavailable for the duration of the operation. The Reorganize Index task encapsulates the Transact-SQL ALTER INDEX statement. So let’s take one thing at a time. 0 to SQL Server 2016 there is no feature to rebuild index automatically. 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. To rebuild an index means to create anew one, then drop the old one. Hi @Devendra Kumar Sahu , You can perform a reorg or rebuild an index based on its fragmentation values. I don't remember if IDENTITY INSERT ON will help. This is quite a big problem in SQL Server, as your indexes will fragment over time. To correct index fragmentation, you can reorganize an index or rebuild an. - 1: The script will just output the index reorganization or rebuild commands without running them. The log size shouldn't be unrestricted. Reorganizing also compacts the index pages. I have configured Ola Hallengren's backup and integrity check scripts. As visible in the above image, REBUILD and REORGANIZE are the two available choices to play out the trim operation over the page. I will read through them and try implementing them. Because I was blamed for the slow SQL Server mainly because I. These are two different modes to remove index fragmentation. This would also keep the original order of columns. That can be found using the STATS_DATE function. e. Please refer to SQL Server Maintenance Plan Reorganize Index and Update Statistics Tasks to get more information about how to design the maintenance plan. SET @BackupDirectory = N'C:Backup' -- <== Change this to your backup directory. Expand the Indexes folder. 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. How Fragmentation Hurts SQL Server Performance. The first and most popular method is to rebuild indexes. The Full-Text Engine in SQL Server is fully integrated with the query processor. We are aware that we. Indexes with small number of pages (<1000) will usually. This task uses the ALTER INDEX. For more information, see Data Types (Transact-SQL). SQL 2012, massive bulk insert into “daily” (heap) table with PAGE compression (~100 GB, ~600 mio rows), create the nonclustered columnstore index (no other indexes on the table), partition switch into main (heap) table. Reorganize or rebuild an index SQL Server Management Studio. As with a B-tree index, the rebuild will create a brand new columnstore index from the underlying data. Resolution: Reorganize and rebuild indexes. To estimate the duration of the REORGANIZE DATABASE you can use the SQL statement from the "Step 1" section in the attached "REORGANIZE estimator" . This removes fragmentation, reclaims disk space by compacting the pages based on the specified or existing fill factor setting. I want to rebuild or reorganize indexes in a table. This script contributed by the Microsoft WSUS team. In the Object Explorer panel locate the database in question, and use right mouse click to bring up the context menu. Create a maintenance plan. Here is a simple query to check fragmentation on your existing indexes:1 Answer. Let’s move on to creating the Reorganize Index task via the Maintenance Plans and then Update Statistics task. Reorganize: Reorganize indexes with between 11-30 percent fragmentation. x), REORGANIZE is only used to compress CLOSED rowgroups into the columnstore. Rebuild or Reorganize SQL Index. A clustered index's key columns are called a clustering key. 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. WITH FULLSCAN Are there any advantages or disadvantages to using "UPDATE STATISTICS (Index name)" as opposed to "ALTER INDEX (index name) ON. The Full-Text Engine compiles and executes full-text queries. Microsoft recommends Index Rebuild operation to defrag indexes if the fragmentation level of your index is greater. The first rebuilds a single index on a table and the second rebuilds all the indexes on the table. ALTER INDEX ALL ON [table_name] REBUILD; Additionally, please note that index reorganization is an online operation and index rebuilding is an offline operation unless explicitly specified as an online. ALTER INDEX __NAME_OF_INDEX__ ON __NAME_OF_TABLE__ REBUILD. SELECT total_execution_time, percent_complete, name,state_desc,last_pause_time,page_count FROM sys. When you rebuild indexes Offline, the operation acquires a Schema modification (Sch-M) lock on the table. Depending on the type of index and database engine version, a rebuild operation can be done online or offline. Rebuilding indexes with a new fill factor makes sure that database pages contain an equally distributed amount of data and free space. Applies to: SQL Server. Note that the time it takes to complete the operations depends on the size of the database and how fragmented the indexes. One or more of the databases used by SharePoint Server have fragmented indexes. Right-click Maintenance Plan and select Execute. 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%. I think there is another way to rebuild fragmented index, You can create an sp and scheduled it via SQL Server Agent or via task scheduler. That's why as a rule of thumb, for fragmentation greater than about 30%. We would like to show you a description here but the site won’t allow us. Rebuild or reindex ?? good question ! Analysis indexes defragmentation RATIO and decide to REORGANIZE OR REBUILD. One or more of the databases used by SharePoint Server have fragmented indexes. The documentation is also indicating that: Online index operations are not available in every SQL Server edition. The. 1. When rebuilding offline your index is completely unavailable, but the operation is faster than that online. Microsoft recommends Index Rebuild operation to defrag indexes if the fragmentation level of your index is greater. One time job to reorganize the indexes One time job to rebuild the indexes Scheduling ongoing reorganization job SQL databases, similar to the file system on a disk, will fragment over time. For us to perform this test we will first create a simple test table with a few columns and load a fair amount of data into it. Unlike DBCC INDEXDEFRAG, or ALTER INDEX with the REORGANIZE option, DBCC DBREINDEX is an offline operation. As of this writing, our super smart SQL Architect and Performance Expert (Jeff Schwartz) is working on some testing to see if there is any measurable overhead to all the misleading out-of-space messages generated during index REORGANIZE maintenance. The script will do a reorg if fragmentation goes over 5 %. The maintenance plan. Does database on which tables reside have database owner. To solve this, I want to use the REORGANIZE operation every time. Applies to: SQL Server 2016 (13. Each night the maintenance plan is successful, but these commands take the longest to execute 3 hours, 3 hours and 5 hours respectivelly. Rebuilding indexes only does the index itself so the column stats are stale unless they hit the "20% data change + 500 records" criteria to trigger the auto-update. Automatic Tuning on Azure SQL Database does not do maintenance of indexes and statistics. To achieve availability similar to the reorganize. If you what you are saying is true, even reorganizing the indexes that have never been, may cause a larger impact on the server as well. If not specified otherwise, the procedure uses the fill factor that is already set for each index. There are some good reasons to Rebuild an index, like updating statistics. The procedure uses SQL Server ALTER INDEX command, with the REORGANIZE option NULL. ;WITH cte AS ( SELECT object_id, index_id, partition_number, rows, ROW_NUMBER () OVER (PARTITION BY object_id, index_id, partition_number. On the Standard bar, select New Query. I'm just using the reorg index task that is in the maintenance plan designer GUI. This REBUILD option is available in SQL Server 2008 onwards. The default value for this parameter will be ‘CATALOG’. Artemakis Artemiou. This happens approx. Index should be rebuild when index fragmentation is great than 40%. Create SQL Server Columnstore Non-Clustered Index. I don't think Windows SQL Server Maintenance has this option yet. This removes fragmentation, reclaims disk space by compacting the pages based on the specified or existing fill factor setting. Use the ReorganizeIndex Task dialog to move index pages into a more efficient search order. Inadequate disk space can degrade performance or even cause the index operation to fail. I'm just using the reorg index task that is in the maintenance plan designer GUI. In this page, we can select the database (specific database or all databases), objects (specific or all objects). To fix the fragmentation either rebuild or reorganize the index on the table. 1. Using SQL Server Management Studio: In the Object Explorer pane navigate to and expand the SQL Server, and then the Databases node Expand the specific database with fragmented index Expand the. Rename. It checks the SQL Server licences, if Enterprise it will rebuild the index online else it. 1. Everything is the same - configuration, CPU, RAM, disk drive layout, similar (but not the same) database with similar data and workload. 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. In this article. However, sometimes you don't want this, say for read only tables or huge tables. Reorganizing Indexes. Both versions allow you to specify the. Note that the time it takes to complete the operations depends on the size of the database and how fragmented the indexes. Mohamad Mahmoud Darwish. If the tables get more than 15% fragmented, performance is very negatively affected. Reorganizing an index only deals with the fragmentation that exists, and the more fragmentation there is, the longer a reorganize will take. Here’s how: Download the MaintenanceSolution. FOR VALUE. indexes ind ON ind. However, the meaning of those operations is different in the case of Columnstore. Reorganizing should be used at lower (<30%) fragmentations but only rebuilding (which is heavier to the database) cuts the fragmentation down to 0%. The second set of options, in figure 8-5, rebuilds only a single partition of a clustered columnstore index and optionally changes the compression type. 2. Create a job to run your index reorganize ('Reorganize'). So now once you have identified the high fragmentation level in your database, which could. The Reorganize Index task encapsulates the Transact-SQL ALTER INDEX statement. Lock durations are short and will cause minimal blocking of queries. If a nonclustered index is being rebuilt, a shared lock is held on the table in question during the operation. Click OK. The Reorganize Index task also includes an option to compact large object data. The below T-SQL statement can be used to retrieve these wait types: 1. It reorgs indexes when fragmentation is below 30% else it rebuild the index. Reorganizing an index only deals with the fragmentation that exists, and the more fragmentation there is, the longer a reorganize will take. Expand the table on which you want to reorganize an index. August 1, 2013 at 3:52 pm. Index rebuilding process uses more CPU and it locks the database resources. I'd just add that adding the line PRINT @sql after the SET @sql =. The easiest way to reorganize an index is to simply drop and recreate the index using the DROP and CREATE INDEX commands. Add a comment. Also, in our nightly database maintenance plan, I have update statistics, reorganize index and rebuild index tasks setup. Rebuild/Reorganize working fine. Click the plus sign to expand the table on which you want to rebuild an index online. HeapTest ( Id INT not NULL Default (1), Col1 char (5000) Not null Default ('Heaps Are Cool') ) SET NOCOUNT ON Insert into dbo. It is causing other queries to wait, even simple ones like: SELECT * FROM tableName WHERE indexedColumn = @value. Method 1: Create a SQL Server Agent job to rebuild indexes and update statistics. This requires the DBA to create such a maintenance job. LDAP_ENTRY. If you can afford that kind of maintenance window it's perfectly fine. #1637994. It’s an unbelievably, disgustingly, repulsively bad idea. Just go to the table, further expand the indexing folder and right after that you can right-click on it and select the option to rebuild all the indexes. You can go the easy way and use SQL Server Maintenance Plans, but unfortunately they’re very simplistic: you can only say “rebuild all the indexes” or “reorganize all the indexes”. This job needs to be scheduled and ran on a weekly basis due to large data. You will often see advice to perform a REBUILD on highly-fragmented indexes, rather than a REORGANIZE-- This is because rebuilding from scratch can be more efficient. The nonclustered B-tree index is updated as changes occur to the columnstore index. In it, enter the Job name, owner, optionally Category. Ignore anything with less than 15-20 pages. In SQL Server, the ALTER INDEX statement is used to modify an existing index. 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. The REINDEX command requires an exclusive table lock, which means that it'll stall any accesses to the table until the command has completed. ALTER INDEX ALL ON [table_name] REORGANIZE; However, if you want to rebuild all the indexes on the table, you can run the following command. Check out my Pluralsight course on fragmentation or read. 3,895 9 51 77. TEST_INDX(id int, bla varchar(255)); CREATE INDEX IX1 ON dbo. Here's another script to add to the list. There are two ways of doing that: (i) by using the ‘ DBCC SHOWCONTIG ‘ command, and (ii) by using the ‘ sys. the. Reorganize the data on the data and index pages by rebuilding indexes with a new fill factor. Index automation Job script. IndexOptimize is the SQL Server Maintenance Solution’s stored procedure for rebuilding and reorganizing indexes and updating statistics. 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. Designing the SQL Server Reorganize Index Task The script below allows you to rebuild indexes for all databases and all tables within a database. SELECT a. Start the Microsoft SQL Server Management Studio client, and then log in to it. Here is the image for additional clarity. SQL: Procedure for rebuild and reorganize indexes like Microsoft says. 1 and another one for versions starting from 6. Otherwise you're holding an exclusive lock on the table/partition before you start the reorganize. In the SQL Management Studio Console, expand Management > Right Click Maintenance Plan and select Maintenance Plan Wizard. From all the research I've done, I can't really find any indication of why you would want page fullness to be low, and am anticipating that I'll want to do an index reorganize operation to set the value to. To add to this, you need to learn your system and how it's used. Bulk amount records are deleted and updated frequently. dm_db_index_physical_stats (under the Examples -> D section: Using sys. For maintenance i create a procedure that: -Shrink Database file (if is enabled) -Shrink Database log file. Disk space is an important consideration when you create, rebuild, or drop indexes. If the index. The fully qualified name or alias in the form: schema. Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance When you perform online index operations, the following guidelines apply: Clustered indexes must be created, rebuilt, or dropped offline when the underlying table contains the following large object (LOB) data types: image, ntext, and text. x) では、REORGANIZE は CLOSED 行グループを列ストアに圧縮するためにのみ使用されます。 最適化操作を実行し、すべてのデルタ行グループを列ストアに強制的に移動する唯一の方法は、インデックスを再構築することです。Yes, just the table and any query that tries to access that table. It is causing other queries to wait, even simple ones like: SELECT * FROM tableName WHERE indexedColumn = @value. When an index becomes skewed, parts of an index are accessed more frequently than others. Unlike DBCC INDEXDEFRAG, or ALTER INDEX with the REORGANIZE option, DBCC DBREINDEX is an offline operation. Article. My problem is that the reorg is running for a very long time. I want to rebuild or reorganize indexes in a table. 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. 3. you are reading your query result incorrect. – Ed B. #1637994. This opens the Toolbox and the maintenance_plan_name [Design] surface with the Subplan_1 subplan. As with a B-tree index, the rebuild will create a brand new columnstore index from the underlying data. If the clustered index is being rebuilt, an exclusive table lock is held. Right-click on the index and select Rebuild. From Rebuild or Reorganize: SQL Server Index Maintenance by Kendra Little: Short version: Rebuild: An index ‘rebuild’ creates a fresh, sparkling new structure for the index. Examining the clustered index, I discovered that while it has 0% fragmentation listed, it has a page fullness value of only 23%. How many pages are in these indexes. Reorganizing also compacts the index pages. Specify the name of the maintenance plan. There are two options that can be used: Reorganize pages with the original amount of free space - this will use whatever was specified when the table was createdThe WSUSDBMaintenance script is a T-SQL script that can be run by SQL Server administrators to re-index and defragment WSUS databases. The index front is stable, no change. This prevents modifications to the table. Over here it will display all the indexes of the table and you can just click OK. Any full-text indexes of non-trivial size with fragmentation of at least 10% will be flagged to be re-built by our over-night maintenance. It has been my understanding that REORGANIZEing an index should not interfere with other operations (that is, it. -Search all indexes of a table that have 5% or more of. The performance benefit may not be noticeable for indexes that are used primarily for seek operations. It defragments the leaf level of clustered and non-clustered indexes on tables and views by physically reordering the. You can do maintenance in phases, where each maintenance phase covers a subset of. SQL Server 2019 adds resumable online index creation, and it’s pretty spiffy: 1. Select Allow online DML processing, and then select True from the list. Feedback. Reorganizing an index uses minimal system resources. If you truly want to REBUILD, and you want to do it for ALL indexes on a given table, then the command would be (straight from the official docs that npe pointed you at): For more instructions see the official docs. Also, in earlier versions the granularity of control was less refined. For now, I have just turned off the weekly index reorganize task which is not really a good long term solution. Reorganize an index For rowstore indexes, the Database Engine defragments only the leaf level of clustered and nonclustered indexes on. Hi Team, Today when I go through some of the SQL Server performance videos, found one interesting video (Please find the link below), where he said that rebuilding indexes is a very expensive thing and it will clear the cache every time an index rebuild happens, (It means that we indirectly killing the SQL Server everything we rebuild. It may also take longer to REORGANIZE a highly fragmented index than to REBUILD it. All you might notice is a drop in performance executing queries while the indexes are gone but dropping and creating a (none-clustered) index has no impact whatsoever on the actual data stored in your tables (Creating a clustered index impacts the physical ordering of your data but again, no data. Points: 1004494. You can go the easy way and use SQL Server Maintenance Plans, but unfortunately they’re very simplistic: you can only say “rebuild all the indexes” or “reorganize all the indexes”. After rebuilding all indexes, some queries seem to take forever for at least two queries/tables. It cames in two flavours: online and offline. sql file. 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. dm_db_index_physical_stats to get information about your index fragmentation (see the avg_fragmentation_in_percent column). Reorganizing an index uses minimal system resources and is an online operation. If the index creation is interrupted, the index isn't re-created. SQL Server Index Rebuild and Reorganize Script. WITH FULLSCAN. For maintenance i create a procedure that: -Shrink Database file (if is enabled) -Shrink Database log file. From a transaction log standpoint, reorganize index generates a lot more small transactions and can lead to substantially more resource-consumption than a rebuild. Then you can do an alter index with the rebuild clause whenever your threshold is reached. If page_count value( which is there in DMV sys. SQL Server doesn’t automatically correct index fragmentation problems. The algorithm to build an index from scratch is different to that which maintains it as data arrives so these non-clustered indexes will be unfragmented too. Script and result below: ALTER INDEX ALL ON Fragmented REORGANIZE GO1 Answer. 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. dm_db_index_physical_stats function is the preferred tool to use to check index fragmentation on any CA or DA database table. What works for me may not work for you. For example, one of the indexes with a page_count of 967 has a fragmentation percentage. When you reorganize an index, SQL Server physically reorders the leaf-level pages to match the logical order of the leaf nodes. This topic provides. name AS IndexName, indexstats. Usually, you should rebuild the index if it has a fragmentation greater than 30% and reorganize it if it has less than 30% fragmentation. If you rebuild the index the stats are updated anyway, so doing it again is just wasteful. There are two files attached - one for versions prior to 6. Coming to update stats, I would prefer to do it with Full Scan depending on the size of the databases. On the Define Reorganize Index Task page, select the server or servers where you'll be moving index pages into a more efficient search. @databaseToCheck (optional) Values: - NULL: It will scan all databases with compatibility level SQL Server 2005 (90) or later for fragmented indexes. Values: - 0: The script will reorganize or rebuild the fragmented indexes.