Also, running UPDATE STATISTICS gets you both index and columns stats updates. There’s no hard and fast rule here but I generally say where. · Add the startup option -T1222 to SQL. To work around this, try the following methods: Method 1 ( recommended ): Limit the number of full-text indexes in the same catalog. The T-SQL script in this article can be run by SQL Server administrators to reindex and defragment WSUS databases. Index rebuilds (not index reorganise) always do a fullscan update of the statistics. 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. Regular index maintenance and statistics updates are crucial, that much is certain. When complete, select Next. _in_percent > 50 AND ss. Please refer to SQL Server Maintenance Plan Reorganize Index and Update Statistics Tasks to get more information about how to design the maintenance plan. As with a B-tree index, the rebuild will create a brand new columnstore index from the underlying data. 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. Unlike DBCC INDEXDEFRAG, or ALTER INDEX with the REORGANIZE option, DBCC DBREINDEX is an offline operation. If a nonclustered index is being rebuilt, a shared lock is held on the table in question during the operation. 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. Reorganize does not holds blocking locks. There are two main ways to defragment a Heap Table: Create a Clustered Index and then drop it. We leave default values here as well. 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. –In this article. Ignore: Fragmentation levels of 10 percent or less should not pose a performance problem, so you don’t need to do anything. These will only generate transaction log when index pages are compacted and reorganized – so for less heavily fragmented indexes. Here is the image for additional clarity. Is this possible to do? In earlier versions of Microsoft SQL Server it could cause system slowdown to reorganize or rebuild a large index. No, there is no auto-magical defragging of indexes. This can be checked using:. ALTER INDEX [PK_SalesOrderDetailEnlarged_SalesOrderID_SalesOrderDetailID] ON [Sales]. Creating a SQL Server Maintenance Plan. Hallengren website has an option to reorganize indexes say with 5% Fragmentation, and rebuild for 30% Fragmentation. First it’ll try an index reorganize, which is an online operation. SQL Server 2012 (11. Change it to be weekly or even less frequently. For a dedicated SQL pool table with an ordered CCI, ALTER INDEX REBUILD will re-sort the data using tempdb. Reorganizing an index uses minimal system resources. Rebuild the Indexes if the Fragmentation level is > 30%. It defragments the leaf level of clustered and nonclustered indexes on tables and views by physically reordering the leaf-level pages to match the logical, left to right, order of the leaf nodes. You can read more on rebuilding indexes here . Mohamad Mahmoud Darwish. Reorganizing only works on the leaf pages. The Index Reorganize operation physically reorders leaf level pages of the index to match the logical order of the leaf nodes. Full-Text Engine. After rebuilding indexes, the application performs badly. In Object Explorer, Expand the database that contains the table on which you want to reorganize an index. In Object Explorer, click the plus sign to expand the database that contains the table on which you want to specify an index's fill factor. Mine might be such a scenario. It doesn’t work on the intermediate pages between the root and the leaf. sql script from Ola’s website and open it up in a query window inside of SSMS. The index uses the main filters on the sales table from the time dimension, i. Reorg the Indexes if the Fragmentation level is > 5% and <30%. Click OK. Rebuilding an index drops and re-creates the index. If you rebuild the index the stats are updated anyway, so doing it again is just wasteful. The job is scheduled to run daily at 5 am and fails once or twice per week. If you choose to compact large object data, the statement uses the. Select Maximum degree of parallelism, and then enter some value between 1. It's a great piece of work - it allows you to define fragmentation levels for which you. SQL Server development version and Enterprise version has option ONLINE, which can be turned on when Index is rebuilt. g. This procedure automatically chooses whether to rebuild or reorganize an index according to its fragmentation level, amongst other parameters, and update statistics. 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. ALTER INDEX [myIndex] ON [dbo]. Click the plus sign to expand the Tables folder. My problem is that the reorg is running for a very long time. The only. Defragmentation in Practice. Reorganize and Rebuild Indexes; SQL Server 2005 Index Best Practices; Fixing Index Fragmentation in SQL Server 2005 and SQL Server 2008; Sample Table for SQL Server Index Performance Testing. Someone else set it up. 1. Otherwise you're holding an exclusive lock on the table/partition before you start the reorganize. 2 contributors. 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. 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 optionALTER INDEX REBUILD on an truncated and therefore empty table serves no purpose, so you need to amend your Plan A. 2. INDEX index-name Specifies the index to use when reorganizing the table. The script will do a reorg if fragmentation goes over 5 %. Stack Exchange Network. Click the plus sign to expand the table on which you want to rebuild an index online. The query causing the block is in the format: ALTER INDEX [indexName] ON tableName REORGANIZE. This opens the Toolbox and the maintenance_plan_name [Design] surface with the Subplan_1 subplan. Since you can have multiple columns in a table, here are a few considerations for index key columns. One of the biggest performance hits that you will see on your databases, next to not having indexes, is indexes that are very fragmented. 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 alternative is to do an index reorganize, either using my old DBCC INDEXDEFRAG or the new ALTER INDEX. index_id > 0 -. 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. 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. Depending on the fragmentation level, you need to rebuild or reorganize the indexes. Microsoft recommends fixing index fragmentation issues by rebuilding the index. Reorganizing an index defragments the leaf level of an index by physically re-ordering pages to match the logical order. USE AdventureWorks; GO ALTER INDEX ALL ON Production. If an index contains less than 100 pages, I will perform no maintenance. Are you seeing problems related to statistics? Or is this just. Many people (and even solutions) in the SQL Server community say you need to look at Index Fragmentation levels (e. ALTER INDEX __NAME_OF_INDEX__ ON __NAME_OF_TABLE__ REBUILD. This REBUILD option is available in SQL Server 2008 onwards. However, sometimes you don't want this, say for read only tables or huge tables. 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. e. It’s an unbelievably, disgustingly, repulsively bad idea. However, reorganizing can be a "more online" operation and is sometimes preferred, even for. you are reading your query result incorrect. Unlike DBCC INDEXDEFRAG, or ALTER INDEX with the REORGANIZE option, DBCC DBREINDEX is an offline operation. December 3, 2010 at 12:21 pm. I'm just using the reorg index task that is in the maintenance plan designer GUI. To solve this, I want to use the REORGANIZE operation every time. 1. 3番目のパラメータは、Non ClusteredインデックスID（sys. In the New Maintenance Plan dialog box, in the Name box, type a name for the plan and select OK. Best regards,. #1162454. set @SQL = 'alter index ' + QuoteName ( @IndexName ) + ' on ' + QuoteName ( @TableName ) + ' rebuild';. 4) Move database back to full recovery mode. Using SQL Server Managed Lock Priority for Online Index Rebuilds. The entire index has to be read to. Use solutions such as Adaptive Index Defrag to automatically manage index defragmentation and statistics updates for one or more databases. The schema is the user name under which the table was created. After finding out almost all databases on my SQL Server had fragmentation over 40%, I decided to do an index rebuild on all tables using a fill factor of 80. The SQL Server Maintenance Solution lets you intelligently rebuild or reorganize only the indexes that are fragmented. As tables grow and shrink, this fragmentation can ultimately play a role in how well SQL runs. To fix the fragmentation either rebuild or reorganize the index on the table. Reorganize: Reorganize indexes with between 11-30 percent fragmentation. 環境SQL Server 2012参考前回の以下の投稿に若干手を加えて作成しました。SQL Server の指定したテーブルのインデックス名を取得する方法ストアドプロシージャを実装するC…too slow alter index reorganize/rebuild (with online) I have 2 similar SQL Server installations on 2 similar GCP projects. An index reorganize holds an intent-exclusive table lock throughout the operation, which will only block shared, exclusive, and schema-modification table locks. Yes. When you reorganize the index, you go through the existing index, cleaning up blocks for deleted records etc. In the Rebuild Indexes dialog box, verify that the correct index is in the Indexes to be rebuilt grid and click OK. Index Rebuild vs Index Reorganize. TEST_INDX(id) WITH (DATA_COMPRESSION = PAGE);Index Reorganize/ Rebuild Time. do nothing; reorganize an index; rebuild an index; Don't reinvent the wheel - just go see and use the script!Effective database performance tuning often relies on having precise database insights to determine actual root causes. ), which reorganizes all the indexes on the. Rules For Index Maintenance: 1. Right-click the table on which you want to specify an index's fill factor and select Design. 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. dm_db_index_physical_stats to get information about your index fragmentation (see the avg_fragmentation_in_percent column). 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. below line will remove the NULL value from the query. You cannot say, “If the index is 45% or more fragmented, rebuild it– otherwise do nothing. There are two ways of doing that: (i) by using the ‘ DBCC SHOWCONTIG ‘ command, and (ii) by using the ‘ sys. 3. - 1: The script will just output the index reorganization or rebuild commands without running them. 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。. The index front is stable, no change. Use the ReorganizeIndex Task dialog to move index pages into a more efficient search order. Reorganizing an index uses minimal system resources and is an online operation. To create a new job, right click on SQL Server Agent, select New and then Job. In Object Explorer, connect to an instance of Database Engine. As data is added to the table, the free space fills because the fill factor isn't maintained. 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. Hallengren website has an option to reorganize indexes say with 5% Fragmentation, and rebuild for 30% Fragmentation. It doesn’t work on the intermediate pages between the root and the leaf. failed with the following error: "The index "SpatialIndex-20180705-165942" on table "extended_index_113435478_384000" cannot be reorganized because page level locking is disabled. This removes fragmentation, reclaims disk space by compacting the pages based on the specified or existing fill factor setting. dm_db_index_physical_stats) is <1000 you don't need to rebuild or reorganize such. In SQL Server, the ALTER INDEX statement is used to modify an existing index. 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. This sample T-SQL script performs basic maintenance tasks on SUSDB 1. ” Select the vault database(s). From a transaction log standpoint, reorganize index generates a lot more small transactions and can lead to substantially more resource-consumption than a rebuild. SQL Server 2017 includes a new system view sys. Defining "Index Stats Options" as well has become available in SSMS. x) and SQL Server 2014 (12. This prevents modifications to the table. No right from SQL Server 7. He has the best practices coded into his scripts, so it should serve you well. SELECT total_execution_time, percent_complete, name,state_desc,last_pause_time,page_count FROM sys. If you want to know how far along it is, open up another instance of SSMS and connect to the server, then run a query against the sys. Below the last two rows that displays the fail: Source: Reorganize Index Executing query "ALTER INDEX [PK_xxTableName] O. #1258597. Rebuild if > 30%. You have to do some research and tailoring of how and when to do it based on your environment, though. As part of query execution, the Full-Text Engine might receive input from the thesaurus and stoplist. I know the sql to perform this action on all indexes in a table is. 1 and another one for versions starting from 6. If the index. Indexes with small number of pages (<1000) will usually. – As well as maintenance plans, SQL Server Agent jobs are also a handy way to automate and schedule index defragmentation jobs in SQL Server. 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. Rebuilding an index can be executed online or offline. The log size shouldn't be unrestricted. Indexes remain compressed when rebuilding / reorganizing them. Reorganizing an index uses minimal system resources. 0. Rebuilds are generally faster. Default SQL Server value is 0 or 100%, which means that no free space should be left on each page. All they do is waste space and resources. It can be done with online option in enterprise edition. The maintenance plan. 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 documentation is also indicating that: Online index operations are not available in every SQL Server edition. If page_count value( which is there in DMV sys. Right-click the index for which you want to set the max degree of parallelism and select Properties. Problem. Large object data is data with the image, text, ntext, varchar (max), nvarchar (max), varbinary (max), or xml data type. ) Index Size is greater than 5 MB's. 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. Spatial Index. This index uses column-based data storage and query processing to achieve gains up to 10. 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. This manual operation two-step. 2. regarding reorganize - there is an exception to this - if you have columnstore indexes that are frequently subject to deletions or that are subject on inserts in small batches then running reorg. index rebuild/reorganize frequency. Reorganizing an index only deals with the fragmentation that exists, and the more fragmentation there is, the longer a reorganize will take. If not specified otherwise, the procedure uses the fill factor that is already set for each index. The following options are available on this page. Jan 11 at 14:24. It can be. We have decided to use the following code to compute a fragmentation % for each full-text index. Apply SQL Server index key column best practices. H. Indexes with small number of pages (<1000) will usually. Reorganizing an Index should be done when you have elevated amounts of white space within your index (i. The Reorganize Index task also includes an option to compact large object data. 2. An index rebuild will always build a new index, even if there’s no fragmentation. Plan B is fine. It should not be used on WSUS 2. [Test] REBUILD WITH (ONLINE = ON); Additionally, I would only rebuild indexes which require it. If the index is disabled, rebuilding brings it back to life. This article introduces the concept of fragmentation and discusses two ways of managing index fragmentation - reorganizing and rebuilding. Expand the Tables folder. m. 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. 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. If you have fragmentation, you need to REBUILD or REORGANIZE. Under Select a page, select Options. I will let you know if it worked. . Expand the Indexes folder. The reason we want to load. This topic provides. EventID, MAX (b. Designing efficient indexes is paramount to achieving good database and. This means that for a lightly fragmented index (e. SET @BackupDirectory = N'C:Backup' -- <== Change this to your backup directory. the. The select statement is blocking on the clustered index (object id 446624634) whereas the object_name() is blocking on the table (object id 462624691). As per followed practice you can rebuild index when fragmentation is >30 % and can reorganize when fragmentation is between 10 and 30 %. 2 Answers. The more the fragmentation you need to rebuild if its less you can reorganize. Yes, rebuilding indexes will take a toll on your transaction log file. index_resumable_operations; We can see that we have paused the online. Applies to: SQL Server. REORGANIZE statement. On the right panel, right-click SQL Server Agent. (About 1 TB of data including myIndex (non. REORGANIZE operation. These pages can get empty space on them and become out of order over time as well. ) rebuilt all indexes on the table. Clustered Columnstore Indexes, as well as “regular” indexes, support the Rebuild and Reorganize operations. Rebuild/Reorganize working fine. It's better to do reorg on Nightly. Product REORGANIZE GO. Right-click the index for which you want to set the max degree of parallelism and select Properties. Possible failure reasons: Problems with the query, "ResultSet" property not set correctly, parameters not set correctly, or connection not established correctly. WHY ? Rebuilding is massive time resource consuming, reindexing more fast than rebuildIn SQL Server Management Studio, in Object Explorer, expand the server. Which is the best method to reorganize sql server database. Frequency of the maintenance should be considered with the goal of minimizing impact of log generation. SQL Server 2019 adds resumable online index creation, and it’s pretty spiffy: 1. 1) Since its indexes are not reorganized before. Add a comment. Veritas now uses the heavily debated command DBCC SHOWCONTIG WITH ALL_INDEXES,or DBCC SHOWCONTIG WITH ALL_INDEXES,tableresults (Table results will give you a table format to read) to. If the tables get more than 15% fragmented, performance is very negatively affected. Right-click Maintenance Plan and select Execute. Beginning with SQL Server 2016 (13. TEST_INDX(id int, bla varchar(255)); CREATE INDEX IX1 ON dbo. The difference is easily visible. Product REBUILD. CREATE TABLE DBO. 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. Over here it will display all the indexes of the table and you can just click OK. Checking the reorganize files box and as a result, shrinking the database file(s) will only impact the database negatively. -- Rebuild or reorganize indexes based on their fragmentation levels DECLARE @work_to_do TABLE ( objectid int , indexid int , pagedensity float , fragmentation float , numrows int ) DECLARE @objectid. x) および SQL Server 2014 (12. Since you issued a REBUILD and not a REORG, cancelling the query will result in a rollback which will take even more time. Each night the maintenance plan is successful, but these commands take the longest to execute 3 hours, 3 hours and 5 hours respectivelly. A spatial index can be created using the following syntax: CREATE TABLE MySpatialTable (id int primary key, geometry_col. Click OK. These are two different modes to remove index fragmentation. This to me would be a sign that constant rebuilds of that index actually aren't a good help. Disk space is an important consideration when you create, rebuild, or drop indexes. However I want advice whether it is required to setup the SQL Server Index and Statistics Maintenance scripts, because my SQL server is running on a SAN infrastructure and I have read that there is no benefit to setting fill-factor to less than 100%, or to perform index. . Offline Rebuilding: This is faster but makes the database unavailable for the duration of the operation. 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. 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. REORGANIZE. -- Compute fragmentation information for all full-text indexes on the database SELECT c. So now once you have identified the high fragmentation level in your database, which could. As well as maintenance plans, SQL Server Agent jobs are also a handy way to automate and schedule index defragmentation jobs in SQL Server. #1637994. If you want to try : I would like you to use READ_COMMITTED_SNAPSHOT isolation level for this operation and see if you succeed. The simple reason which comes to my mind is rebuild should be done only when index is fragmented. 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. For more information, see sys. It checks the SQL Server licences, if Enterprise it will rebuild the index online else it. つまり、断片化率がある一定の閾値を超えた場合は再構築（REBUILD）、そうでない場合は再構成（REORGANIZE）を推奨する、というものです。 ただし、再構築をオンラインで実行するためにはSQL ServerのエディションがEnterpriseでなければいけません。 Identify and remove index fragmentation – this is obviously what we have been talking until now and the biggest part of the SQL index maintenance. In my last tip, Index Fragmentation Report in SQL Server 2005 & 2008, I discussed what fragmentation is, its different types, its performance impact and what are different methods available in SQL Server 2005 and 2008 to identify fragmentation levels. avg_page_space_used_in_percent column in the sys. This script contributed by the Microsoft WSUS team. I don't think Windows SQL Server Maintenance has this option yet. Depending on the type of index and the Database Engine version, a rebuild operation can be done offline or online. 11. FullTextIndexOptimize. index optimization job failed from the last 4 days. . ) Reorganize = fragmentation level is between 5% and 30%. In the Object Explorer panel locate the database in question, and use right mouse click to bring up the context menu. That means that it sometime has to contend with blocking because it's sharing the same pages that. . 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”. I still see questions about SQL Server 2000/2005 pop up on Stack Exchange. 1. When fragmentation is above 30%, rebuild the index. 000 rows. 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. Summary: SharePoint Server uses SQL Server to store most of the content for the Web site and configuration settings. Depending on the type of index and database engine version, a rebuild operation can be done online or offline. We check the time for sample select query - it was 2s just after index creation. In this page, we can select the database (specific database or all databases), objects (specific or all objects). 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%. Article. This method can help when. Fair enough, but let’s make some adjustments. 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. we are using Ola index job to rebuild and reorganize the index. The procedure uses SQL Server ALTER INDEX command, with the REORGANIZE option NULL. To create a new job, right click on SQL Server Agent, select New and then Job. Automatic Tuning on Azure SQL Database does not do maintenance of indexes and statistics. 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. I used the sp_who2 procedure to see which queries were waiting, and which other query they were blocked by. To reorganize index SQL Server, right-click it & choose Reorganize. Regards. The nonclustered B-tree index is updated as changes occur to the columnstore index. 1. The index can be rebuilt using ALTER INDEX REBUILD T-SQL command. 1. Rebuild if > 30%. Last weekend the index maintenance took more than 5 hours and the full backup was running at the same time. SELECT OBJECT_NAME(ind. Create a execute sql task and schedule it through sql agent . HeapTest ( Id INT not NULL Default (1), Col1 char (5000) Not null Default ('Heaps Are Cool') ) SET NOCOUNT ON Insert into dbo. The performance benefit may not be noticeable for indexes that are used primarily for seek operations. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn,. This operation checks the index, and if there is a need, it fixes the physical ordering of pages. Depending on database and indexes size it will grow. In the infrequent cases where you do need to reorganize or re-build index, consider these: Run index maintenance during off peak period. Particularly if you are in full recovery. Resolution: Reorganize and rebuild indexes. When rebuilding offline your index is completely unavailable, but the operation is faster than that online. In the IndexOptimize procedure, you can define a preferred index maintenance operation for each fragmentation group. Rebuilding a clustered columnstore index is an offline operation until SQL Server 2019 when the ability to rebuild online was introduced. In this article. USE AdventureWorks; GO ALTER INDEX ALL ON Production. " failed with the following error: "Transaction (Process ID 94) was deadlocked on lock resources with another process and has. Test all three and see which is fastest and which gives the least index fragmentation. When using columnstore indexes, the delta store may end up with multiple small row groups after inserting, updating, and. x), REORGANIZE is only used to compress CLOSED rowgroups into the columnstore. However, each time I check (even immediately after recreating the indexes) the avg_fragmentation_in_percent shows 100%. 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. It cames in two flavours: online and offline. However, the meaning of those operations is different in the case of Columnstore.