The log size shouldn't be unrestricted. 1. The following index operations require no additional disk space: ALTER INDEX REORGANIZE; however, log space is required. To reduce the number of fragments, reorganize the full-text catalog by using the REORGANIZE option of the ALTER FULLTEXT CATALOGTransact-SQL statement. We will call this stored procedure Maintenance. Last weekend the index maintenance took more than 5 hours and the full backup was running at the same time. Such indexes (fragmented) can lead to slow application response and decrease query performance. Er…. e. Basically, an index rebuild copies the index to another place. Total fragmentation is 96% page fullness 66%, avg row size is 20,. The easiest way to reorganize an index is to simply drop and recreate the index using the DROP and CREATE INDEX commands. This job needs to be scheduled and ran on a weekly basis due to large data load. When an index becomes skewed, parts of an index are accessed more frequently than others. Your could find your indexes are 95% plus fragmented, affecting query performance badly. No, there is no auto-magical defragging of indexes. ” Select the vault database(s). To create a new job, right click on SQL Server Agent, select New and then Job. Create table and compressed index. 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. ), which reorganizes all the indexes on the. Mohamad Mahmoud Darwish. Workaround. 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. Here is a simple query to check fragmentation on your existing indexes:1 Answer. SQL Server ALTER INDEX Syntax. Since you can have multiple columns in a table, here are a few considerations for index key columns. Change it to be weekly or even less frequently. Defragmentation in Practice. Are there any advantages or disadvantages to using " UPDATE STATISTICS (Index name) " as opposed to "ALTER INDEX (index. This index uses column-based data storage and query processing to achieve gains up to 10. You can do maintenance in phases, where each maintenance phase covers a subset of. With the SQL performance analyzer in DPA, DBAs can check SQL index fragmentation on the server and get pinpointed advice about wait times, SQL statements, and the actual workload—across the past five seconds or five years—they. This means long-term object-level locks are not held and queries or updates to the underlying table can continue during the ALTER INDEX. 1. Reorganize the data on the data and index pages by rebuilding indexes with a new fill factor. Right-click on the index and select Rebuild. Script to Manage SQL Server Rebuilds and Reorganize for Index Fragmentation. record_count > 0 AND o. Rebuild or Reorganize indexes Ask Question Asked 1 year, 1 month ago Modified 1 year, 1 month ago Viewed 1k times 0 I want to reorganize or rebuild indexes. The REINDEX command requires an exclusive table lock, which means that it'll stall any accesses to the table until the command has completed. Everything is the same - configuration, CPU, RAM, disk drive layout, similar (but not the same) database with similar data and workload. dm_db_index_physical_stats) is <1000 you don't need to rebuild or reorganize such. The documentation is also indicating that: Online index operations are not available in every SQL Server edition. August 21, 2010 at 11:54 pm. A spatial index can be created using the following syntax: CREATE TABLE MySpatialTable (id int primary key, geometry_col. ALTER INDEX statement can be used to change the properties of an index, such as its fill factor or sort order, or to rebuild or reorganize the index. If the index creation is interrupted, the index isn't re-created. When fragmentation is above 30%, rebuild the index. The fully qualified name or alias in the form: schema. 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. ALTER INDEX ALL ON table_name REORGANIZE OR. Same with updating the stats first and then rebuilding. Possible failure reasons: Problems with the query, "ResultSet" property not set correctly, parameters not set correctly, or connection not established correctly. There needs to be an automated Index defragmentation job that will either reorganize or rebuild the indexes based on the fragmentation level for a specific table in a specific database. The simple reason which comes to my mind is rebuild should be done only when index is fragmented. 2. This means every time we need to scan the. There's a general consensus that you should reorganize ("defragment") your indices as soon as index fragmentation reaches more than 5 (sometimes 10%), and you should. Fragmentation. Index Rebuild : This process drops the existing Index and Recreates the 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. ALTER INDEX ALL ON [dbo]. Larger indexes have more intermediate levels and pages. However, you can create a staging table insert all rows into that, drop original table and rename staging table to original. – As well as maintenance plans, SQL Server Agent jobs are also a handy way to automate and schedule index defragmentation jobs in SQL Server. You can also see if a reorganize will help until you can do a full rebuild. First, we will start the index reorganization in a session using the following T-SQL code. This procedure automatically chooses whether to rebuild or reorganize an index according to its fragmentation level, among other parameters, and update statistics with a linear threshold. I know the sql to perform this action on all indexes in a table is. However, these numbers are only for general guidance as a starting point for your environment. In the infrequent cases where you do need to reorganize or re-build index, consider these: Run index maintenance during off peak period. Beginning with SQL Server 2016 (13. . For more information, see CREATE INDEX (Transact-SQL). It is causing other queries to wait, even simple ones like: SELECT * FROM tableName WHERE indexedColumn = @value. If you choose to compact large object data, the statement uses the. This operation checks the index, and if there is a need, it fixes the physical ordering of pages. #1162454. Additionally, after reorganizing indexes it is reasonable to update the statistics as this operation does not update the statistics like the index rebuild operation. 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. It is causing other queries to wait, even simple ones like: SELECT * FROM tableName WHERE indexedColumn = @value. Regular index maintenance and statistics updates are crucial, that much is certain. If you don’t spend much time with SQL Server and you. This means every time we need to scan the. In the Select Maintenance Tasks page, select the following tasks: Reorganize. Use Ola Hallengren ‘s IndexOptimize but don’t use his defaults. The T-SQL script in this article can be run by SQL Server administrators to reindex and defragment WSUS databases. Correct way of maintenance of SQLServer Cluster Columnstore Index. If you cancel a rebuild operation midway, it. 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. Depending on database and indexes size it will grow. You can use Ola's Index maintenance solution or Michelle Ufford's - Index Defrag Script. Here are a couple of examples. SQL Server internally does not keeps in any system table the fragmentation value so how it is going to decide what criteria to select when. Select “reorganize index” and “rebuild index. ". x) および SQL Server 2014 (12. Under Select a page, select Options. WITH FULLSCAN. [Product] SET ( ALLOW_PAGE_LOCKS = ON ) ALTER INDEX [PK_Product] ON [Production]. GO. If not specified otherwise, the procedure uses the fill factor that is already set for each index. We leave default values here as well. You don’t get bonused based on the amount of free space on your drives. 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. Index Rebuild operation first drops and then recreates the index. It doesn’t work on the intermediate pages between the root and the leaf. 21 Code: 0xC0024104 Source: Reorganize Index Task Description: The Execute method on. Unfortunately I didn't try the reorganize between the above 2 troubleshooting steps, so I am not sure which one did the trick, but i am leaning towards the PK. REORG INDEXES/INDEXES command reorganizes indexes. When complete, select Next. REORGANIZE operation. The fill factor determines the amount of empty space on each page in the index, to accommodate future expansion. One or more of the databases used by SharePoint Server have fragmented indexes. Designing efficient indexes is paramount to achieving good database and. Speaking for SQL Server, I tend to choose a index size and index fragmentation level at which point I begin performing index maintenance. I will read through them and try implementing them. DROP INDEX when you are dropping a nonclustered index. HeapTest ( Id INT not NULL Default (1), Col1 char (5000) Not null Default ('Heaps Are Cool') ) SET NOCOUNT ON Insert into dbo. You can drop and create indexes at will. Databases list. Create a job to run your index reorganize ('Reorganize'). For a dedicated SQL pool table with an ordered CCI, ALTER INDEX REBUILD will re-sort the data using tempdb. So, whenever I need to rebuild the indexes of my OrdersItemstable, with some millions of rows, my customers can't create/edit new orders for about 2-4 minutes. The select statement is blocking on the clustered index (object id 446624634) whereas the object_name() is blocking on the table (object id 462624691). Here's another script to add to the list. SQL Server doesn’t automatically correct index fragmentation problems. Sorted by: 1. The index uses the main filters on the sales table from the time dimension, i. One or more of the databases used by SharePoint Server have fragmented indexes. dm_os_wait_stats DMV, you will find 21 new wait types related to the SQL Server 2014 Lock Priorities. 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). Because I was blamed for the slow SQL Server mainly because I. Use the ReorganizeIndex Task dialog to move index pages into a more efficient search order. Index automation Job script. USE [SQLMaestros] GO ALTER INDEX [PK__Subscrib__7DFEB63423B0DFD3] ON [hol]. Select the Compact large object column data checkbox to specify that all pages that contain large object (LOB) data are also compacted. Reorganize or rebuild an index SQL Server Management Studio. LDAP_ENTRY. index_resumable_operations to monitor and check the current execution status for resumable index rebuilds. Large object data is data with the image, text, ntext, varchar (max), nvarchar (max), varbinary (max), or xml data type. USE AdventureWorks; GO ALTER INDEX ALL ON Production. 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. We are using clustered columnstore index in SqlServer 2016 for 400M rows. On a data partitioned table, you can reorganize a specific nonpartitioned index on a partitioned table, or you can reorganize all the partitioned indexes on a. Create an agent WMI alert ('Reorganize Relief Valve') on a performance condition. The alternative for online rebuilding is to create a new index using CREATE INDEX CONCURRENTLY, then drop the old. There are two files attached - one for versions prior to 6. · Add the startup option -T1222 to SQL. There are two options to fix fragmentation. 3,895 9 51 77. g. Please post more details like how are you running the reorganize via TSQL or SSMS or SSIS. To update all statistics in a table. The. The database is using the Simple Recovery model. Rebuilding an index means that a whole new set of pages is allocated for it. Syntax ALTER INDEX index_name ON table_name. 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. Near the top of the script, around line 32, you will see a line of Transact-SQL code that looks like this: 1. Index Rebuild vs Index Reorganize. Unlike DBCC INDEXDEFRAG, or ALTER INDEX with the REORGANIZE option, DBCC DBREINDEX is an offline operation. 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. This opens the Full-text. Thank you all for your suggestions. August 1, 2013 at 3:52 pm. The Reorganize Index task encapsulates the Transact-SQL ALTER INDEX statement. Also, in earlier versions the granularity of control was less refined. Larger indexes have more intermediate levels and pages. 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. The Reorganize Index task encapsulates the Transact-SQL ALTER INDEX statement. @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. If the index. Right-click the table on which you want to specify an index's fill factor and select Design. 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. 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). I still see questions about SQL Server 2000/2005 pop up on Stack Exchange. This caused the system to reorganize or rebuild some indexes even. This job needs to be scheduled and ran on a weekly basis due to large data. 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. What works for me may not work for you. Applies to: SQL Server 2016 (13. How Fragmentation Hurts SQL Server Performance. We will use 3 statements in order to show the blocking: ALTER INDEX. Expand the Indexes folder. I don't think Windows SQL Server Maintenance has this option yet. from truncation) in 7 hours. Many people (and even solutions) in the SQL Server community say you need to look at Index Fragmentation levels (e. It may also take longer to REORGANIZE a highly fragmented index than to REBUILD it. 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. As with a B-tree index, the rebuild will create a brand new columnstore index from the underlying data. [Subscribers] REBUILD; You can replace REBUILD with REORGANIZE in the above query to. When rebuilding offline your index is completely unavailable, but the operation is faster than that online. An index reorganize holds an intent-exclusive table lock throughout the operation, which will only block shared, exclusive, and schema-modification table locks. INDEX index-name Specifies the index to use when reorganizing the table. Reorganize Index Task Forum – Learn more on SQLServerCentral. Unlike DBCC INDEXDEFRAG, or ALTER INDEX with the REORGANIZE option, DBCC DBREINDEX is an offline operation. . 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. Script to reorganize all indexes on all tables in user databases. The database is using the Simple Recovery model. Article. More actions. Rebuilds are generally faster. x) and in Azure SQL Database, we recommend using ALTER INDEX REORGANIZE instead of ALTER INDEX REBUILD for. Also, in our nightly database maintenance plan, I have update statistics, reorganize index and rebuild index tasks setup. Check the column, avg_fragmentation_in_percent and if its greater than. Before using it, note that “Rebuild” and “Reorganize” are two different operations, even though they both reduce fragmentation in the index. index_id > 0 -- Indexes. Creating a SQL Server Maintenance Plan. Find and remove unused indexes – everything that is unused doesn’t do anything good. In SQL Server, you "might" run into issues with "updating primary key". indexes ind ON ind. In Object Explorer, Expand the database that contains the table on which you want to reorganize an index. There are two ways of doing that: (i) by using the ‘ DBCC SHOWCONTIG ‘ command, and (ii) by using the ‘ sys. Also trying to avoid logging to transaction log and log. Copy and paste the following example into the query window and click Execute. They are also configured from SSMS. The table can be in a local or a remote database. index_resumable_operations; We can see that we have paused the online. IndexOptimize is supported on SQL Server 2008, SQL Server 2008 R2, SQL Server 2012, SQL Server 2014, SQL Server 2016, SQL Server 2017, SQL Server 2019, SQL Server 2022, Azure SQL Database, and. 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. Best regards, Carrin Cancelling / Stopping ALTER INDEX REORGANIZE. Frequency of the maintenance should be considered with the goal of minimizing impact of log generation. Also, running UPDATE STATISTICS gets you both index and columns stats updates. Index Fragmentation and out of date statistics! Don't forget stats, it's one of the most important factors in SQL Server deciding whether or not to use a index. May 5, 2010 at 8:00 am. 2. The Query Optimizer. 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. Yes. Navigate to Tasks / Shrink / Database. Poorly designed indexes and a lack of indexes are primary sources of database application bottlenecks. Rebuild or Reorganize SQL 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 rebuild. It is recommended to use an integer data type in the index. Reorganizing also compacts the index pages. SQL Server Index Rebuild and Reorganize Script. 1. 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. you are reading your query result incorrect. For a dedicated SQL pool table with an ordered CCI, ALTER INDEX. Categorize fragmentation percentage – Microsoft suggests that we. This to me would be a sign that constant rebuilds of that index actually aren't a good help. Maintenance. Please refer to SQL Server Maintenance Plan Reorganize Index and Update Statistics Tasks to get more information about how to design the maintenance plan. در این مقاله روش بهینه سازی ایندکسها با استفاده از reorganize و rebuild کردن ایندکس تکه تکه شده (Fragmented Index) با استفاده از محیط SQL Server Management Studio و Transact-SQL شرح داده خواهد شد. The Reorganize Index task also includes an option to compact large object data. If there are frequent changes to the full-text catalog, use this. dm_db_index_physical_stats (under the Examples -> D section: Using 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%. This can be demonstrated by small test. less than 30% fragmentation), it’s generally faster to reorganize the index, but for a more heavily fragmented index, it’s generally faster to just. Create a job to run your index reorganize ('Reorganize'). 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. It drops index entirely and creates it from scratch. avg_fragmentation_in_percent FROM sys. Hi Everyone, We have a weekly maintenance plan in place that fails with the following error: Executing the query "ALTER INDEX [NCI_WI_BId_PId_PMId_SId_NPB] ON [Infr. We have decided to use the following code to compute a fragmentation % for each full-text index. The Reorganize Index task encapsulates the Transact-SQL ALTER INDEX statement. 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. Index should be rebuild when index fragmentation is great than 40%. Select Maximum degree of parallelism, and then enter some value between 1 and 64. 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. before i answer your question is the database on simple recovery. Reorganizing an index uses minimal system resources. The performance benefit may not be noticeable for indexes that are used primarily for seek operations. Coming to the point out of all there is a database with 51Gb, yes we have seen some big tables majorly occupying space in db. Setup a new job to run update stats via IndexOptimize daily. Otherwise you're holding an exclusive lock on the table/partition before you start the reorganize. @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. For maintenance i create a procedure that: -Shrink Database file (if is enabled) -Shrink Database log file. Setup a new job to run update stats via IndexOptimize daily. When I ran the query again, this was the result: Fragmentation over 70% for 12 indexes, over 30% for 15 indexes. USE AdventureWorks; GO ALTER INDEX ALL ON Production. SQL Server development version and Enterprise version has option ONLINE, which can be turned on when Index is rebuilt. _in_percent > 50 AND ss. Also, up to SQL Server 2008 R2, you could not perform online rebuild on Large Object (LOB) data: varchar(max), nvarchar(max), varbinary(max), or XML. Resolution: Reorganize and rebuild indexes. The job is scheduled to run daily at 5 am and fails once or twice per week. This option will rebuild your indexes so that the data is laid out in a more efficient manner when queries are run to use the data. SQL Fool (Michelle Ufford) has a great script to do this for you - all done and well tested by many users. set @SQL = 'alter index ' + QuoteName ( @IndexName ) + ' on ' + QuoteName ( @TableName ) + ' rebuild';. REBUILD will not just rebuild index, but also force update of corresponding statistics. There needs to be an automated Index defragmentation job that will either reorganize or rebuild the indexes based on the fragmentation level for a specific table in a specific database. So your db need to have: data space to accomodate your new index, data space to make a sort since you used SORT_IN_TEMPDB = OFF, and it needs log to be large. deteriorating. In both these scenarios they are blocked by session 54 – the index rebuild. Index Rebuild operation first drops and then recreates the index. USE AdventureWorks; GO ALTER INDEX ALL ON Production. Therefore, focus on the larger indexes because their pages are less likely to be cached by SQL Server. Rebuild drops. For now, I have just turned off the weekly index reorganize task which is not really a good long term solution. This procedure automatically chooses whether to rebuild or reorganize an index according to its fragmentation level, amongst other parameters, and update statistics. Instead of our phone book having 1,000 pages that are 100% full, we might have 1100 pages that are only 90% full. Expand Databases, and then expand the database that contains the full-text index. avg_page_space_used_in_percent column in the sys. Answer: If you are using SQL Server 2014, 2016, 2017 or latest version of SQL Server, you can run the following command and it will abort the index rebuilding process after the period of the time. 4) Move database back to full recovery mode. ;WITH cte AS ( SELECT object_id, index_id, partition_number, rows, ROW_NUMBER () OVER (PARTITION BY object_id, index_id, partition_number. Reorganize an index For rowstore indexes, the Database Engine defragments only the leaf level of clustered and nonclustered indexes on. Similarly, removing fragmentation in a. Note that the time it takes to complete the operations depends on the size of the database and how fragmented the indexes. This is how records are made unique in the context of a clustered index. Check out my Pluralsight course on fragmentation or read. Use the online version of the Rebuild Index task ; Use the Reorganize Index task followed by the Update Statistics task; If you have the Enterprise Edition of SQL Server, the Maintenance Plan Wizard offers a Keep index online while reindexing option, which means that the index will continue to be available to users even while it is being. In this article. 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. Indexes with small number of pages (<1000) will usually. If you rebuild the index the stats are updated anyway, so doing it again is just wasteful. Basically, an index rebuild copies the index to another place. This means that for a lightly fragmented index (e. You can reorganize all indexes that are defined on a table by rebuilding the index data into unfragmented, physically contiguous pages. To add to this, you need to learn your system and how it's used. On large tables, that may be a while and not frequent enough. SQL: Procedure for rebuild and reorganize indexes like Microsoft says. Instead of running rebuild index on whole database we are planning to run it against each table. 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”. A probable cause is that the changed (presumably reduced) size of the structures after rebuilding means the optimizer is choosing a different plan. Recommend 7 or less. " failed with the following error: "Transaction (Process ID 94) was deadlocked on lock resources with another process and has. 5) Perform full database backup. An index rebuild will always build a new index, even if there’s no fragmentation. How Fragmentation Hurts SQL Server Performance. Designing the SQL Server Reorganize Index Task The script below allows you to rebuild indexes for all databases and all tables within a database. The equivalent statistics update can be achieved by: UPDATE STATISTICS . Index rebuilds look. To check the maintenance plan agent job, open the Job Activity Monitor window, and check if the job is enabled, executing or idle, the last. [Subscribers] REBUILD GO Rebuilding all indexes in a table USE [SQLMaestros] GO ALTER INDEX ALL ON [hol]. It should be: TRUNCATE; Insert ; ALTER INDEX REBUILD; It might stil be slow, but at least you get sharp indexes. ) Are there open cursors in the database, if so skip the database. EventID, MAX (b. REORGANIZE. SSC Guru. Start the Microsoft SQL Server Management Studio client, and then log in to it. To work around this, try the following methods: Method 1 ( recommended ): Limit the number of full-text indexes in the same catalog. 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. 4. 11. 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. This opens the Toolbox and the maintenance_plan_name [Design] surface with the Subplan_1 subplan. Create a execute sql task and schedule it through sql agent . 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. FileID, a. The index reorganize operation will be always performed online. The import process should be reworked to bulk-load one table at a time. For now, I have just turned off the weekly index reorganize task which is not really a good long term solution. When you reorganize the index, you go through the existing index, cleaning up blocks for deleted records etc. Click OK. It cames in two flavours: online and offline. sql to our customers's SQL Server instance. If an index is between 10% and 30% fragmented, I will REORGANIZE the index and UPDATE the statistics. Our Production instance is running SQL Server 2014. WHY ? Rebuilding is massive time resource consuming, reindexing more fast than rebuildIn SQL Server Management Studio, in Object Explorer, expand the server. In the New Maintenance Plan dialog box, in the Name box, type a name for the plan and select OK. Copy. 2. I want to reorganize or rebuild indexes. This script detects indexes for rebuilding using these rules: Rebuild the index when these conditions are true: - deleted entries represent 20% or more of the current entries. Change it to be weekly or even less frequently. ALTER INDEX index_name ON table_name REORGANIZE OR. 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.