A rebuild can compress the data more efficiently within each combination of distribution and partition: It can open such existing columnstore segments and shuffle. 13. Scale back down once the index rebuild is complete. avg_fragmentation_in_percent : Number of out of order pages in the index - Lower value is better 2. 1. It is documented that you can rebuild the index ONLINE for those indexes which has LOB columns as the index key. For a dedicated SQL pool table with an ordered CCI, ALTER INDEX. This query creates the necessary ALTER INDEX statements to correct the. ALTER INDEX ON REORGANIZE . For more information, see Columnstore index rowgroup. I use SQL Server 2008 R2, I need to rebuild the index for every table in a database. REBUILD) and reorganizing an index (using ALTER INDEX. They work differently toward the same end. The second part of this tip is intended to reduce the duration for update statistics as it pertains to both. So you should explicitly set a deadlock priority, and perhaps a retry loop, to enforce the behavior and document it. column_name DISABLE; ALTER INDEX index_name ON table_name REBUILD; ALTER. Microsoft describes in the link below how you can check the fragmentation of indices on tables in MSSQL and then how you can re-organize (re-build) the indices to reduce the fragmentation percentage. One can also reorganize an index using. Eğer merak ettikleriniz olursa bana linkedin hesabımdan ulaşabilirsiniz. 図「key_compression. Consider Ola Halengren's SQL Server Maintenance Solution for Azure SQL Database index maintenance as well as Managed Instance and on-prem. x) dan di Azure SQL Database, sebaiknya gunakan ALTER INDEX REORGANIZE alih-alih ALTER INDEX REBUILD untuk indeks penyimpan kolom. 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): ALTER INDEX ALL ON mySchema. Hi Team, I am looking for a script, which can provide defrag status and generate rebuild and reorganize scripts ALTER statement in Azure SQL DB. Unlike REORGANIZE on user tables, REORGANIZE on a queue is always performed as an offline operation because page level locks are explicitly disabled on queues. Rebuild/Reorganize working fine. Rename the task to Index. Thanks, I will try this next time. ALTER INDEX CCI_TEST on DBO. TABLE. To reduce the number of fragments, reorganize the full-text catalog by using the REORGANIZE option of the ALTER FULLTEXT CATALOGTransact-SQL statement. In SQL Server, you can use ALTER INDEX with the REORGANIZE or REBUILD option. This makes it more likely that some other session is blocked by your session, and that you may, in turn, become blocked by a lock held by that session. Make sure the DB recovery mode is SIMPLE. The Query Optimizer updates statistics when you rebuild an index on a table or view with ALTER INDEX REBUILD or DBCC DBREINDEX, however this statistics update is a byproduct of re-creating the index. ALTER INDEX ALL ON [tablename] REORGANIZE Rebuild should be used when the fragmentation index is greater than 30% and reorganization option should be used when the fragmentation index is between 5. This should not take long on a table with only 400 000 rows but it is. 1. It creates a table that has multiple rowgroups, and then demonstrates how REORGANIZE merges the rowgroups. REBUILD WITH (FILLFACTOR = 90); ALTER INDEX AK_SalesOrderHeader_SalesOrderNumber ON Sales. ]index optionsOptions: The options used with this command can be any combination of the. Expand the table in which the index belongs and then expand Indexes. Master merging a large amount of data can create a long running transaction, delaying truncation of the transaction log during checkpoint. marc_s. 3. Or exclude the ALTER operation using WHERE clause ( [allow_page_locks] = 0) on these indexed tables. Reorganizing also compacts the index pages. Syntax: ALTER INDEX [ IF EXISTS ] name RENAME TO new_name ALTER INDEX [ IF EXISTS ] name SET TABLESPACE tablespace_name ALTER INDEX [ IF EXISTS ] name SET ( storage_parameter = value [,. In this article. DBREINDEX will always defragment as clean copies are made whereas INDEXDEFRAG churns pages. Index automation job script. In a perfect world I guess it should only be like 400 rowgroups. Recreate the specified index. As the max possible rows in a row. 그러므로 파일 그룹에 사용 가능한 빈 페이지가 있어도. Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance. RedDk 31-Aug-13 15:32pm. Perform ALTER INDEX ALL . To "enable", SET to 1. We would like to show you a description here but the site won’t allow us. For a table with an ordered clustered columnstore index, ALTER INDEX REORGANIZE does not re-sort the data. The advantage of this statement should let users query full-text indexes while running, but there is a price: depending on the amount of data that has to be treated, it can take some time to complete and hence introduce some undesired events. I don't agree with Kin this is a knee response that will be a least help. To rebuild an index means to create anew one, then drop the old one. DROP INDEX when you are dropping a clustered index offline without specifying the MOVE TO clause and nonclustered indexes do not exist. The following index operations require no additional disk space: ALTER INDEX REORGANIZE; however, log space is required. Syntax ALTER INDEX {index | ALL} ON object DISABLE [;]. Your new index will have the size non less than the size of disabled index. The results for this command are up for comparison against the Alter Index Rebuild command. x) and in Azure SQL Database, we recommend using ALTER INDEX REORGANIZE instead of ALTER INDEX REBUILD for columnstore indexes. Method 2: Set Change_Tracking to Manual, by using the following command: ALTER FULLTEXT INDEX ON table_name. [dbo]. In this article. The first part of this tip focuses on SQL Server Enterprise Edition to reduce the duration for index maintenance for off-line rebuilds. Indexes created as part of a constraint are dropped when the constraint is dropped. x), REORGANIZE is only used to compress CLOSED rowgroups into the columnstore. You don’t need to run both against the same index. Reorganizing an index uses minimal system resources and also compacts the index pages. ALTER INDEX ALL ON dbo. SQL accepts the challenge of sorting the leaf-level pages in the. ALTER INDEX (Transact-SQL) Salt la conținutul principal. You can read more on rebuilding indexes here . Changing the table's owner automatically changes the index as well. Our Production instance is running SQL Server 2014. [CompletedEventText] REORGANIZE. If you truncate a table, all indexes will be USABLE but empty. The final post in this series will cover parallelism and the UPDATE STATISTICS command, and if. ALTER INDEX REBUILD is an offline operation on Standard Edition in the sense that it requires locks. Interestingly, using the Reorganize Index Task in a SQL Maintenance Plan did not cause the out of space errors. In the infrequent cases where you do need to reorganize or re-build index, consider these: Run index maintenance during off peak period. Msg 50000, Level 16, State 1, Procedure dbo. To Reindex WSUS Database using T-SQL Script: Launch the SQL Server Management Studio. This caused the system to reorganize or rebuild some indexes even. It is important that you experiment to determine the best threshold for your environment. LOB_COMPACTION Compacting large object (LOB) data can reduce the disk space used. It is compatible with all versions of SQL Server 2005 , 2008 , 2012 , 2014 and 2016. REBUILD. Session 61: executing a select on the rebuilt table SELECT TOP 1 * FROM ExecQueryWaitStats. Expand the Indexes folder. Compressed rowgroups - Rowgroups are using columnstore compression. ALTER INDEX __NAME_OF_INDEX__ ON __NAME_OF_TABLE__ REBUILD. x), REORGANIZE is only used to compress CLOSED rowgroups into the columnstore. 3) You cannot also specify the deallocate_unused_clause in this statement. ALTER INDEX. ALTER INDEX [IX_beerfilter_FloatTable_DateAndTime] ON [dbo]. This can be mitigated by regular maintenance of the columnstore index with ALTER INDEX REORGANIZE. Rebuild the index. ALTER INDEX REBUILD will create a new index, and then drop the old one. One of the blocking scenarios I find most interesting is related to online index rebuilds. We can see that the command completed successfully with ONLINE=ON. The following index operations require no additional disk space: ALTER INDEX REORGANIZE; however, log space is required. No, there is no auto-magical defragging of indexes. Note: One thing ALTER INDEX does not allow you to do is change the set of columns that comprises the. Disable the index. Rebuilding an Index. The code first adds 1. Reorganize only requires 8KB of additional space in the database. The ONLINE option is not saved anywhere, it affects only the current statement that creates or rebuilds the index, even though some of the options are saved in sys. MySQL "plays it safe". To re-sort data, use ALTER INDEX REBUILD. Using above query, you could also query the progress of backup,restore,dbcc command and so on. 1. 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. In columnstore world an update translates into a delete + insert and a delete is "deferred". . Otherwise you're holding an exclusive lock on the table/partition before you start the reorganize. This statement essentially merges all the fragments. VeryImportantTable REBUILD; GO The second method is to reorganize indexes. 3 Answers. Expand the Tables folder. When you don't explicitly name the constraint / index, a name is auto-generated. Compaction is based on the existing fill. The first part of this tip focuses on SQL Server Enterprise Edition to reduce the duration for index maintenance for off-line rebuilds. Typically if page locks have been disabled on an index there is a really good reason why, so recommending that someone blindly change that. If the fragmentation of an index is more than 20% then we can try rebuilding that index: ALTER INDEX Index_Name ON [Database_name]. Newer controls on the Maintenance Plan user. がレンジ・パーティションまたはハッシュ・パーティションである. ". With very large indexes, rebuilds take longer, generate more log, impact performance more while they’re running. August 1, 2013 at 3:52 pm. Hi, if you need to set a different fillfactor for a specific group of tables I think you could duplicate your existing script to manage two different sets of tables, the first to set for example. Reorganizing an index defragments the leaf level of an index by physically re-ordering pages to match the logical order. It preserves the index and constraint definitions. 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. ALTER INDEX with WAIT_AT_LOW_PRIORITY. What happens when you try to rebuild an index, a Sch-M lock is requested on the object that you're trying to rebuild. 14. This browser is no longer supported. I got no errors, but I still have fragmentation. Querying sys. ALTER INDEX. If you are satisfied with the unused space of table, then check the unused space of the database using the same command without specifying a table. SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER OFF GO /* TIPO DO OBJETO. Indexes and ALTER TABLE. The documentation for alter index, for example, shows that it accepts an index_name, not an expression that might evaluate to an index name. There are scripts out there that will go though and reorganize verses rebuild versus skip. がドメイン索引である場合は、 句の有無に関係なく)、 句のみ指定できます。. Disabling indexes. We can however get it back to a compressed segment by issuing the following command we saw previously. What is index fragmentation, and why is it a concern?Index fragmentation occurs when data pages within an index are disordered or scattered. DBCC SHRINKDATABASE(WorldOfHurt, 1); And it’ll reorganize the pages in the WorldOfHurt to leave just 1% free space. Descărcați Microsoft Edge Mai multe informații. If a nonclustered index is being rebuilt, a shared lock is held on the table in question during the operation. Here is the syntax for the same. 1,253 1 1 gold. PS C:> Invoke-DbaDbShrink -SqlInstance sql2014 -Database AdventureWorks2014 -PercentFreeSpace 50 -FileType Data -StepSize 25MB. > 30% ALTER INDEX REBUILD WITH (ONLINE = ON)*. Sorted by: 1. Follow edited Jul 26, 2022 at 15:50. For an [!INCLUDEssazuresynapse-md] table with an ordered clustered columnstore index, ALTER INDEX REORGANIZE does not re-sort the data. They work differently toward the same end. At present we are running that script in SSIS package for all the tables to alter indexes that are necessary to rebuild or reorganize in sequential manner. 1 million rows in 11. YourTableName(columns to include) The ALTER INDEX statement in SQL Server (see docs) is available to alter certain properties (storage properties etc. This tip will explore two features to speed up SQL Server index and statistics maintenance. From the documentation: “When a clustered index is dropped OFFLINE, only the upper levels of clustered indexes are removed; therefore, the operation is quite fast. I tried running both commands separately too and still have fragmentation. The MSDN ALTER INDEX page says "An index cannot be reorganized when ALLOW_PAGE_LOCKS is set to OFF. 4 Answers. . 前提条件 . So in order to fix my issue I went ahead and rebuild my index which fixed the issue. REORGANIZE command (more details on this command and its usage are given below). It is causing other queries to wait, even simple ones like: SELECT * FROM tableName WHERE indexedColumn = @value. CommandExecute, Line 163 [Batch Start Line 0] Msg 155, 'RESUMABLE' is not a recognized ALTER INDEX REORGANIZE option. Lorsque vous exécutez ALTER INDEX REORGANIZE, avec ou sans LOB_COMPACTION, la valeur de degré maximal de parallélisme correspond à une opération de thread unique. Regards EchoALTER INDEX is in fact just an alias for the forms of ALTER TABLE that apply to indexes. What you might want to do, if you still insist on defragmenting your indexes, is to do ALTER INDEX REORGANIZE instead. Expand the table on which you want to reorganize an index. This job needs to be scheduled and ran on a weekly basis due to large data. ALTER INDEX . x), use ALTER INDEX. When I run a maintenance plan to reorganize and rebuild tables indexes, it fails. Yes, rebuilding indexes will take a toll on your transaction log file. This allows you to interrupt the rebuild and preserve the work already done. In SQL Server 2017, first, create the index without the online option. However, sometimes you don't want this, say for read only tables or huge tables. ALTER INDEX All ON tableName REORGANIZE; Rebuild or Reorganize SQL Index. So in your case you will have to do a reorganize with compress all row groups, to get it working fine. There is a similar case for your reference: Check progress of alter index reorganize / rebuild. ¿ Reorganize fragmented indexes. However, I would recommend researching scripts others have written that are well tested and used by. You may try. Expand the Indexes folder. Select the Compact large object column data checkbox to specify that all pages that contain large object (LOB) data are also compacted. alter index reorganize 문을 사용하면 작업에서 파일 그룹 내의 다른 파일이 아닌 동일한 파일에만 임시 작업 페이지를 할당할 수 있으므로 인덱스가 포함된 데이터 파일에 사용 가능한 공간이 있어야 합니다. These values provide a rough guideline for determining the point at which you should switch between ALTER INDEX REORGANIZE and ALTER INDEX REBUILD. And again, the table undergoing index maintenance and the table in the. The table has an NVARCHAR (MAX) column. Disabling an index prevents user access to the index, and for clustered indexes, to the underlying table data. Pour plus d’informations, consultez Configurer des opérations d’index parallèles. がレンジ・パーティションまたはハッシュ・パーティションである. There are two options to fix fragmentation. However, ALTER TABLE ignores DATA. TEST REORGANIZE We get our open delta store again, which will cause locking. extension_name. The reorganize process reorganizes the leaf nodes of the index physically to match it with the logical order, this physical order matching the logical order improves the performance of index scans. Memory requirements for partitioned index operations that require sorting can be greater if the Query Optimizer applies degrees of parallelism to the build operation. ALTER INDEX IX_OrderTracking_SalesOrderID ON. delete of a row which was not yet copied). Index Rebuild operation first drops and then recreates the index. Please help me. In PostgreSQL, ALTER INDEX command changes the definition of an existing index. It was trying to do so because when Index is. With the following command: ALTER INDEX [PK_FooDetail] ON [DbName]. Run this command: 1. Let’s move on to creating the Reorganize Index task via the Maintenance Plans and then Update Statistics task. In SQL Server 2014, new functionality was introduced that allows you to control how the blocking mechanism, that is required by the online index rebuild operation, is handled. ALTER INDEX REORGANIZE is used for rebuilding or reorganizing indexes, but it does not maximize columnstore compression. There were questions regarding which indexes are actually rebuild touched and what are not. 1. Also, some tables/indexes will hardly be fragmented. In fact, if an index is UNUSABLE the truncate will actually mark it as USABLE by the very fact that it knows there are no rows. 例えば、10 % 以上 30 % 未満であれば再構成 (Reorganize)、 30% 以上であれば再構築 (Rebuild) するとすれば、. After running the Rebuild and Reorganize Index operation our database developer wrote, the Clustered Indexes dropped significantly to less than 0. Particularly if you are in full recovery. If index is a local index. Rebuilding an index drops and re-creates the index. From another point of view. Cancelling / Stopping ALTER INDEX REORGANIZE. REORGANIZE or REBUILD (as suggested already). Syntax ALTER INDEX index_name ON table_name. If you have space constraints, and can’t make use of single-partition rebuild, reorganizing is the way to go. Also, since this is a non-clustered index, you could drop and then create the index. For example, you can add or remove a column from the index key, or change the setting of an index option. 1 Answer. SalesOrderHeader SET ( STATISTICS_NORECOMPUTE = ON, IGNORE_DUP_KEY = ON, ALLOW_PAGE_LOCKS = ON ) ; To modify index columns To add, remove, or change the position of an index column, you must drop and recreate the index. REORGANIZE, UPDATE STATISTICS and a simple SELECT statement. But commit your whole transaction before reorganize. You could also refer another query which may be helpful to you. ALTER INDEX [myIndex] ON [dbo]. Session 56: the query attempting to look for the transaction locks, but getting stuck in the object_name() function call: SELECT tl. Then issue some transaction log backups, next a differential backup, followed by more transaction log backups, then another differential and finally some transaction log backups. If you read complete article it was trying to point out the commands or operations in SQL Server which would require additional disk space and others that would not. For a table with an ordered clustered columnstore index, ALTER INDEX REORGANIZE does not re-sort the data. And if the reorganize is a deadlock. 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。. Below are steps : 1) Provision an Automation Account if you don’t have any, by going to and select New > Management > Automation Account. resource_subtype, CASE WHEN resource_type =. #1592569. Name + ' ON ' + T. When investigating we found that the index reorganise for the clustered index of FooDetail takes between 90 minutes and 120 minutes. Index REORGANIZE is always serial operation. In general, a common plan for index maintenance is as follows: Perform an index reorganization with the compress_all_row_groups option on after any large data load, or on a semi-regular basis. Example: 3. Table Options. WITH (ONLINE = ON) Drop the existing columnstore index and run the query again. Before you execute the query you can disable the background tuple mover task by using the trace flag 634. x) de y en Azure SQL Database, se recomienda usar ALTER INDEX REORGANIZE en lugar de ALTER INDEX REBUILD para los índices de almacén de columnas. Note: You can select “Reorganize All” to reorganize all the indexes in the table. First, make sure you're checking index fragmentation and only rebuilding indexes that actually need it. Index rebuilds are only mostly online. Update COLUMNSTORE index in DB transaction. If ONLY is not specified, the table and all of its descendant tables (if any) are updated. 2. Starting with SQL Server 2016 (13. Unfortunately, there is no way to run a partial organize (the way you can partially shrink a log file for example). See this blog post for details. The length of time the rebuild takes is related to the size of the index, not the amount of fragmentation in it. Index Rebuild vs Index Reorganize. There is more functionality in the ALTER INDEX than the DBCC REINDEX commands:This means long-term object-level locks are not held and queries or updates to the underlying table can continue during the ALTER INDEX. ALTER INDEX IXCS_Test ON [DBTest]. Alter Index ReOrganize – 345512 ms (346 secs or just under 6 minutes to complete) DBCC DBReIndex just like mentioned at the start of this blog is being deprecated. I used the sp_who2 procedure to see which queries were waiting, and which other query they were blocked by. But, fill factor is defined in index properties, and is not overriden in index rebuild settings, so I believe both operations should respect the value. The problem I’ve been seeing is people rebuilding indexes and then updating statistics. [FooDetail] REORGANIZE WITH (LOB_COMPACTION = ON). Parallel index execution and the MAXDOP index option apply to the. VeryImportantTable REBUILD; GO -- If you want to rebuild all the indexes on a table, try this code. Solution. It defragments the leaf level of clustered and nonclustered indexes on tables and views by physically reordering the leaf-level pages to match the. Nonclustered index A contains 1 million rows. A more intelligent way is to check fragmentation first then rebuild or reorganise. Check total_pages in sys. Important. #1258597. USE myDb GO EXEC. (and even with the Enterprise Edition, is blocking when rebuilding clustered indexes) If the above is all correct, the question is: During an ALTER INDEX. Like the tests above the initial start point is as per the second screenshot above. See if you can find the index name either in whatever UI you use for Synapse or by querying the sys. I cannot say that index reorganize job was the reason for slowness because for me its a light activity. @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. . Note In SQL Server 2012 (11. The effect delivered is that REORGANIZE "conditions" a whole lot of indexes in such a fashion as to perpetuate page splits, which is both logical and physical (page density) fragmentation at its. The fix: Figured out that this cannot be done. The database free space would be reduced to 50MB. ALTER INDEX REORGANIZE. Because there are so many of them running at a time (each in a different database), and they are going parallel (which ties up even more workers), everything piles up. The tablespace to which the index will be moved. More specifically deletes are reflected in the deleted bitmap, which the engine joins with the data and returns the rows visible to your transaction. 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. REBUILD. To resort the data use ALTER INDEX REBUILD. Copy and paste the following example into the query window and select Execute. [<table_name>] REORGANIZE How to Reorganize and Rebuild Indexes using SSMS. IndexOptimize is the SQL Server Maintenance Solution’s stored procedure for rebuilding and reorganizing indexes and updating statistics. An ‘ALTER INDEX REBUILD’ statement was executed on object ‘dbo. Statistics on indexes automatically get updated. If we then try to reorganize this index. ALTER INDEX IndexName ON TableName REBUILD; It is a very simple syntax. This form of REINDEX cannot be executed inside a transaction block. ALTER INDEX All ON tableName REBUILD; This drops the index and recreates it, removing fragementation, reclaims disk space and reorders index pages. The Index reorganize operation is a light weight operation that is always performed online in any SQL Server edition and it shouldn’t cause any serious blockings. Reorganizing an index uses minimal system resources. The fix is to update all rebuild index scripts. This prevents modifications to the table. その他のすべての句は無効です。. ALTER INDEX [myIndex] ON [dbo]. And if the reorganize is a deadlock. Share. Let’s use DBCC SHRINKDATABASE to reclaim the empty space. For more info about the options described on this page, see ALTER INDEX (Transact-SQL). [User] REBUILD [SQLSTATE 01000] (Message 0). Click the plus sign to expand the table on which you want to rebuild an index online. 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. Once that is done, it executes the ALTER INDEX command to reorganize the index. Note that ALTER INDEX REORGANIZE cannot reduce page fullness. [GerardStatsTest] WITH RESAMPLE, INCREMENTAL=ON; This will make all of the statistics incremental statistics. Create a maintenance plan. Reorganizing an index uses minimal system resources. Here is the syntax of the ALTER INDEX Rebuilding index. Your replica/ mirrors may fall behind. This is inexpensive, online, and will generally keep an index defragmented enough for efficient use for quite a long time. For example, if a given index is used mainly for scan. The below stored procedure will reorganize the index if the fragmentation is between 10% and 30%. Alter Index in PostgreSQL 9. Columnstore supports index defragmentation by removing deleted rows without the need to explicitly rebuild the index. In the Rebuild Indexes dialog box, verify that the correct index is in the Indexes to be rebuilt grid and click OK. See this blog post for details. Reorganizing should be used at lower (<30%) fragmentations but only rebuilding (which is heavier to the database) cuts the fragmentation down to 0%. Generally when we need to check fragmentation we use the DB_ID with Detailed mode. Select Allow online DML processing, and then select True from the list. Whether you rebuild or reorganize indexes depends on the following guidelines: avg_fragmentation_in_percent value Corrective statement. 1. REBUILD to rebuild the in-row data of the heap, as well as all data of the indexes, and re-enable them. ALTER INDEX. TEST_INDX DISABLE ; alter index IX1 on DBO. Otherwise you're holding an exclusive lock on the table/partition before you start the reorganize. gif」の説明 図「alter_index_partitioning. The guidance from Microsoft is that indexes be rebuilt if the fragmentation is over 30% and reorganized if the fragmentation is between 5 and 30%. This prevents modifications to the table. If a nonclustered index is being rebuilt, a shared lock is held on the table in question during the operation. You don’t need to run both against the same index. If the table has a secondary “ TOAST ” table, that is reindexed as well. To reorganize an index, the following command can be used: ALTER INDEX IX_Employees ON Employees REORGANIZE; To change the fill factor of an index, the following command can be used: ALTER INDEX IX_Employees ON Employees. Ticket'). To address fragmentation, you can rebuild or reorganize indexes regularly. I have tried almost. Expand Databases, right-click SUSDB and select New Query. This is a best practice for performance when you rebuild or reorganize indexes. I know the sql to perform this action on all indexes in a table is. set @SQL = 'alter index ' + QuoteName ( @IndexName ) + ' on ' + QuoteName ( @TableName ) + ' rebuild';. Ok i am confused, i was replacing my "alter index reorganize" part with the "execution dbo. You need to assemble the SQL prior to calling SP_ExecuteSQL, i. Index REORGANIZE operations are an excellent way to combine undersized rowgroups, assuming they do not suffer from dictionary size limitations. One can also.