However, the REBUILD still needs to take a lock for a moment to swap the old index for the new index. 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. Your new index will have the size non less than the size of disabled index. In previous versions of SQL Server, we might need to cancel the index maintenance operation either due to running out of time in the maintenance period, blocking issues or maybe low disk space due to the transaction log filling up. IndexOptimize is the SQL Server Maintenance Solution’s stored procedure for rebuilding and reorganizing indexes and updating statistics. You can optionally specify * after the table name to explicitly indicate that descendant tables are included. REORGANIZE) more than 30% logical fragmentation, rebuild it (using DBCC DBREINDEX or ALTER INDEX. The DBCC command is a consistency checker utility inside of SQL Server whereas ALTER is a DDL SQL command. It. In other words, the progress of index reorganization cannot be obtained before SQL Server 2008. Run this command: 1. Indexes with small number of pages (<1000) will usually. So in order to fix my issue I went ahead and rebuild my index which fixed the issue. 1. Hi, The widely used thresholds are: Reorganize if fragmentation is between 10-30%. Scale back down once the index rebuild is complete. It is a more online-ish compared to rebuild. They can also remove. 5% and < = 30% ALTER INDEX REORGANIZE 30% ALTER INDEX REBUILD WITH (ONLINE = ON)* Reorganize and Rebuild Indexes. x) and SQL Server 2014 (12. 4. [Item] REORGANIZE . In SQL Server, you can use ALTER INDEX with the REORGANIZE or REBUILD option. DECLARE @Statement. 13. The REORGANIZE operation is always performed online. Let’s move on to creating the Reorganize Index task via the Maintenance Plans and then Update Statistics task. And again, the table undergoing. Recommendations and examples for indexing tables in dedicated SQL pool in Azure Synapse Analytics. The problem is that this ALTER INDEX blocks the web server SPIDs & the whole things locks up for an hour & an admin has to go in & kill the index spid. Possible failure reasons: Problems. I have tried almost. New ALTER INDEX UPDATE BLOCK REFERENCES syntax fixes the invalid physical guesses without reconstructing. Yes. There are scripts out there that will go though and reorganize verses rebuild versus skip. 3 Answers. The database has READ_COMMITTED_SNAPSHOT enabled. The new functionality is called Managed Lock Priority. #1258597. . Finally, in case you’re wondering about parallelism and reorganizing indexes…the WITH (MAXDOP = n) option is not available for ALTER INDEX REORGANIZE, as index reorganization is always a single-threaded operation. Here are a couple of examples. Disabling an index prevents user access to the index, and for clustered indexes, to the underlying table data. [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. The index can be reorganized using ALTER INDEX REORGANIZE T-SQL command. Our Production instance is running SQL Server 2014. ) Then rerun the above free-space query again to see how the shrink worked: Free space after. index_id > 0 -- Indexes. 2) After creating the Automation Account, open the details. 277 4 4 silver badges 12 12 bronze badges. Microsoft recommends that you reorganize indexes when fragmentation is between 5%. [TableName] REBUILD GO-- Check that only clustered index is enabled SELECT OBJECT_NAME (OBJECT_ID), Name, type_desc, is_disabled FROM. Click OK. Compaction is based on the existing fill. 4 Answers. column_name DISABLE; ALTER INDEX index_name ON table_name. x) and later versions. RESUMABLE = ON means you can pause the index. Index rebuilds are only mostly online. Recommend 7 or less. Expand the Indexes folder. When I run a maintenance plan to reorganize and rebuild tables indexes, it fails. sakuraime 2,311. Once that is done, it executes the ALTER INDEX command to reorganize the index. If I run the top query again, the index is still listed there with the same level of fragmentation. x) dan SQL Server 2014 (12. [Table_Name] REBUILD OR - to rebuild all the indexes in the table. We have shrunk the files, rebuild indexes using the offline option on those tables, but still unable to see any free space that is released. MySQL "plays it safe". Note In SQL Server 2012 (11. -- Create a database CREATE DATABASE [ columnstore ]; GO -- Create a rowstore staging table CREATE TABLE [ staging ] (. But commit your whole transaction before reorganize. 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. Expand the table in which the index belongs and then expand Indexes. An antimatter column is used to track possible conflicts between the updates and the rebuild (ie. Henrik Høyer. However, I would recommend researching scripts others have written that are well tested and used by. 1) The first step is to export the data from the index-organized table. I suspect the reorganize is compacting the index after the rebuild and thus moving quite a bit of data around. ALTER INDEX [ix_EvtRowChksum] ON [WinPerfDataSQL]. The ways I can think around this problems are: 1) set the database to simple recovery mode while you run the reorganize, but you said that isn't acceptableExample #. Here is a sample script to reorganize any index in SQL Server. allow_page_locks = 0 AND T. REBUILD Is a BLOCKING operation, unless you have SQL Server Enterprise Edition. From Reorganize and Rebuild Indexes. 1. If the response is helpful, please click "Accept Answer" and upvote it. Answers. If the clustered index is being rebuilt, an exclusive table lock is held. ALTER INDEX [IX_beerfilter_FloatTable_DateAndTime] ON [dbo]. WITH FULLSCAN. Index Rebuild vs Index Reorganize. One of the blocking scenarios I find most interesting is related to online index rebuilds. Basically, an index rebuild copies the index to another place. In this example, first, I’ll create a new non-clustered index by specifying ONLINE, RESUMABLE, and a MAXDOP of two. The first and most popular method is to rebuild indexes. Before you execute the query you can disable the background tuple mover task by using the trace flag 634. Generally when we need to check fragmentation we use the DB_ID with Detailed mode. In columnstore world an update translates into a delete + insert and a delete is "deferred". 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%. 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. The reorganization process is blocked when the process tries to move rows to the full file. new_name. YourTableName(columns to include) The ALTER INDEX statement in SQL Server (see docs) is available to alter certain properties (storage properties etc. The indexes can be reorganized using ALTER INDEX. All other index DDL operations require additional temporary disk space to use during the operation, and permanent disk space to store the. One can also reorganize an index using. 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. Your replica/ mirrors may fall behind. There are scripts out there that will go though and reorganize verses rebuild versus skip. ALTER INDEX . You need to assemble the SQL prior to calling SP_ExecuteSQL, i. Listing 14-7 Syntax for a Columnstore Reorganize Operation. 1 Answer. The process of reorganizing an index-organized table requires four steps, as shown in the following series of images. indexes I LEFT OUTER JOIN sys. (About 1 TB of data including myIndex (non-clustered)). For more information on ordered clustered columnstore indexes, see Performance tuning with ordered clustered columnstore index. 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. In other words, the progress of index reorganization cannot be obtained before SQL Server 2008. (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. As you can see here, a Sch-M lock has a conflict with almost every locking. ALTER INDEX. TEST REORGANIZE WITH (COMPRESS_ALL_ROW_GROUPS = ON) Now we have to good columnstore segment again. The equivalent statistics update can be achieved by: UPDATE STATISTICS . More specifically deletes are reflected in the deleted bitmap, which the engine joins with the data and returns the rows visible to your transaction. We are seeing an issue wherein millions of records are deleted from the tables that have column QUERY_BLOB(data type ntext), but the table usage is still the same. Right-click the index that you want to rebuild online and select Properties. The reorganization process is blocked when the process tries to move rows to the full file. It gives you better advantage when tempdb is. This is inexpensive, online, and will generally keep an index defragmented enough for efficient use for quite a long time. References: QUESTION 39 You administer a Microsoft SQL Server database named Sales. Reorganizing an index does not update associate statistics. . Columnstore index, both clustered and nonclustered, can get fragmented like any other index. Here is another syntax for reorganizing the index. gif」の説明 図「alter_index_partitioning. We will use 3 statements in order to show the blocking: ALTER INDEX. TEST REORGANIZE We get our open delta store again, which will cause locking. REBUILD will not just rebuild index, but also force update of corresponding statistics. 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:Rebuild is an ALTER command so even if the job is running the step is trying to execute the plan which has that command in the logic and failing. . 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. storage_parameter. Below is an example of this technique, where the @PartitonNumber value can be changed in a restart scenario. Click the plus sign to expand the table on which you want to rebuild an index online. Syntax ALTER INDEX {index | ALL} ON object DISABLE [;]. This clause is valid only for domain indexes in a top-level ALTER INDEX statement and in the rebuild_clause. [CompletedEventText] REORGANIZE. If the action is "Rebuild", this is the SQL I'm running: ALTER INDEX PK_My_Table ON dbo. Index Rebuild operation first drops and then recreates the index. alter index all on dbo. 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. Beginning with SQL Server 2016 (13. Your replica/ mirrors may fall behind. Our Production instance is running SQL Server 2014. Unfortunately, there is no way to run a partial organize (the way you can partially shrink a log file for example). It is important that you experiment to determine the best threshold for your environment. The rebuild can be resumed later after the previously completed partition number. gif」の説明 図「alter_index_partitioning. ALTER INDEX REORGANIZE is used for rebuilding or reorganizing indexes, but it does not maximize columnstore compression. If the fragmentation of an index is more than 20% then we can try rebuilding that index: ALTER INDEX Index_Name ON [Database_name]. I tried running both commands separately too and still have fragmentation. below line will remove the NULL value from the query. There are several other supportability improvements on the Columnstore front. Indexes created as part of a constraint are dropped when the constraint is dropped. 常にオンラインで実行されます。 つまり、alter index reorganize トランザクション中は、長期にわたって他をブロックするテーブル ロックは保持されず、基になるテーブルへのクエリまたは更新を続行できます。 無効なインデックスに対しては指定できません。 Open Object Explorer & expand the database containing the table you wish to reorganize. alter the column as VARBINARY(MAX). . From another point of view. For maintenance i create a procedure that: -Shrink Database file (if is enabled) -Shrink Database log file. The MSDN ALTER INDEX page says "An index cannot be reorganized when ALLOW_PAGE_LOCKS is set to OFF. You must rebuild each partition or subpartition. In order to complete they need a very high level of lock: a schema modification lock (SCH-M). Therefore, you do not need to update statistics after performing ALTER INDEX REBUILD, DBCC DBREINDEX, DBCC INDEXDEFRAG, or ALTER INDEX REORGANIZE operations. It preserves the index and constraint definitions. So let's say AdventureWorks2014 was 1GB and it's using 100MB space. For a table with an ordered clustered columnstore index, ALTER INDEX REORGANIZE does not re-sort the data. 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. This is a simple problem to solve. object_id WHERE I. Memory requirements for partitioned index operations that require sorting can be greater if the Query Optimizer applies degrees of parallelism to the build operation. 2) You cannot rebuild an entire partitioned index. Compacting this data can improve disk space use. (In fact if you are alter any indexes, the data stored in the index will be rearranged to fit to the new definition). Everything is the same - configuration, CPU, RAM, disk drive layout, similar (but not the same) database with similar data and workload. “Reorganize” index option. Maybe I should explain. Qualification Limit for REORGANIZE to remove deleted rows from a rowgroup in Columnstore Index: By default when one runs ALTER INDEX REORGANIZE the qualifying limit to remove delete rows from a rowgroup is --> the specific rowgroup have 10% of the max possible rows in a rowgroup deleted. Statistics on indexes automatically get updated. ALTER INDEX REBUILD will create a new index, and then drop the old one. Parallel index execution and the MAXDOP index option apply to the. The ways I can think around this problems are: 1) set the database to simple recovery mode while you run the reorganize, but you said that isn't acceptable Example #. Changing the table's owner automatically changes the index as well. If index is range-partitioned or hash-partitioned, then Oracle Database deallocates unused space from each index partition. Cancelling / Stopping ALTER INDEX REORGANIZE. August 1, 2013 at 3:52 pm. resource_type, tl. Connect to Database engine with your credentials. 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 Azure SQL. PARTITION Only rebuild/reorganize one partition of the index. [FooDetail] REORGANIZE WITH (LOB_COMPACTION = ON). I am not sure from where you have got this script however it seems you are trying to rebuild indexes if the fragmentation level is more than 30 and reorganize if the same is less than 30. SQL Server 2016 (13. For the 'best possible' results REBUILD offline, with MAXDOP = 1, and SORT_IN_TEMPDB = ON. Recreate the specified 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. I used the sp_who2 procedure to see which queries were waiting, and which other query they were blocked by. 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]. 1. asked Jul 26, 2022 at 12:55. Rebuild the Indexes if the Fragmentation level is > 30%. REORGANIZE Is on ON LINE operation in ALL flavors of SQL Server. To "enable", SET to 1. I'm modifying our index reorg/rebuild process to be sensitive to indexes that have ALLOW_PAGE_LOCKS turned OFF. [<table_name>] REORGANIZE How to Reorganize and Rebuild Indexes using SSMS. x) and in Azure SQL Database, we recommend using ALTER INDEX REORGANIZE instead of ALTER INDEX REBUILD for columnstore indexes. Starting with SQL Server 2016 (13. Modify an existing index on a table or view. I have a MSSQL clustered index, which I want to rebuild, since I dropped some columns and I want to free space. DROP INDEX when you are. Rebuilding indexes is done using the following statement. Method 2: Set Change_Tracking to Manual, by using the following command: ALTER FULLTEXT INDEX ON table_name. Share. Running an ALTER PARTITION FUNCTION statement can split one table or index partition that uses the partition function into two partitions. 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. resource_subtype, CASE WHEN resource_type =. dm_db_index_physical_stats fincation have index_id which display heap and index informatiob. Keep in mind that, depending on the amount of indexed data, a master merge may take some time to complete. Alter Index in PostgreSQL 9. Benes Guislandi, 2011-08-10 (first published: 2011-07-06) This script execute the Reorganize or Rebuild of the index tables. REORGANIZE, UPDATE STATISTICS and a simple SELECT statement. You need the name to be able to drop the index. (I sometimes find that people are doing both against every index in a maintenance plan. column_name DISABLE; ALTER INDEX index_name ON table_name REBUILD; ALTER. myTable REBUILDIt sets deadlock priority to 10 (the highest possible value), then performs inserts and deletes until >50% index fragmentation is achieved. Of course depending on database size it can be massive. BOL: " Reorganize and Rebuild Indexes This topic describes how to reorganize or rebuild a fragmented index in SQL Server 2012 by using SQL Server Management Studio or Transact-SQL. . For example, if a given index is used mainly for scan. x), REORGANIZE solo se usa para comprimir los grupos de filas CLOSED en el almacén. Copy and paste the following example into the query window and select Execute. Sale_CCI_ORDERED REORGANIZE;. There's a difference between REORGANIZE and REBUILD. ". SQL Server ALTER INDEX Syntax. • DROP INDEX only when the user drops a non-clustered index. [dbo]. Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance. Under Select a page, select Options. . indexstats. Sorted by: 2. The syntax for rebuilding indexes is very simple, we just add the "WITH ONLINE=ON" clause to the ALTER INDEX command. The Query Optimizer does not update statistics after DBCC INDEXDEFRAG or ALTER INDEX REORGANIZE operations. Reorganizing an index defragments the leaf level of an index by physically re-ordering pages to match the logical order. 索引が自分のスキーマ内にある必要があります。自分のスキーマ内にない場合は、alter any indexシステム権限が必要です。 monitoring usage句を実行する場合は、索引は自分のスキーマ内に存在する必要があります。. 1 Answer. REORGANIZE is an "online" operation, which means it doesn't take a big Sch-M lock at the beginning of the operation to have exclusive. REORGANIZE is your option. Also, some tables/indexes will hardly be fragmented. In the Index Properties dialog box, make the desired changes. Index automation job script. DBCC SHRINKDATABASE(WorldOfHurt, 1); And it’ll reorganize the pages in the WorldOfHurt to leave just 1% free space. These commands only require a single 8KB page of extra space, instead of needing to build a whole new index in the case of an index rebuild operation (which will likely cause the file. ¿ Reorganize fragmented indexes. 図「key_compression. 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. 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. myTable REBUILDIt sets deadlock priority to 10 (the highest possible value), then performs inserts and deletes until >50% index fragmentation is achieved. When you don't explicitly name the constraint / index, a name is auto-generated. Reorg the Indexes if the Fragmentation level is > 5% and <30%. Right-click the index that you want to modify and then click Properties. Here is the syntax for the same. The name of the extension that the index is to depend on. There was formerly an ALTER INDEX OWNER variant, but this is now ignored (with a warning). A partir SQL Server 2016 (13. What you might want to do, if you still insist on defragmenting your indexes, is to do ALTER INDEX REORGANIZE instead. Document table. It. table1 REBUILD WITH (ONLINE=ON ,SORT_IN_TEMPDB =. REBUILD to rebuild the in-row data of the heap, as well as all data of the indexes, and re-enable them. The DBCC REINDEX command was deprecated in a previous version so it is not as robust as the new ALTER INDEX command is today. 3) Load data. The index reorganize operation will use single thread only, regardless of the SQL Server Edition used. gif」の説明. The documentation for alter index, for example, shows that it accepts an index_name, not an expression that might evaluate to an index name. Expand the Indexes folder. REORGANIZE also optimizes internal index and catalog structures. ON [my]. We have a maintenance script which analyses the page_count and fragmentation of the indexes and follows the following guideline:-less than 10% logical fragmentation, don’t do anything; between 10% and 30% logical fragmentation, reorganize it (using ALTER INDEX. ALTER INDEX [myIndex] ON [dbo]. -- Test 2: ALTER INDEX REBUILD-- Rebuliding should work fine ALTER INDEX [PK_TableName] ON [dbo]. Expand the table in which the index belongs and then expand Indexes. When a clustered index is dropped ONLINE, SQL Server rebuilds the heap two times, once for step 1 and. In order to keep the fragmentation ratio of indices low, you should re-organize the indices from time to time on MSSQL. too slow alter index reorganize/rebuild (with online) I have 2 similar SQL Server installations on 2 similar GCP projects. Make sure the DB recovery mode is SIMPLE. deallocate_unused_clause . Below are steps : 1) Provision an Automation Account if you don’t have any, by going to and select New > Management > Automation Account. Or exclude the ALTER operation using WHERE clause ( [allow_page_locks] = 0) on these indexed tables. For more info about the options described on this page, see ALTER INDEX (Transact-SQL). However, the actual values may vary from case to case. Under Select a page, select Options. Right-click the index that you want to rebuild online and select Properties. I know the sql to perform this action on all indexes in a table is. I got no errors, but I still have fragmentation. In the infrequent cases where you do need to reorganize or re-build index, consider these: Run index maintenance during off peak period. Syntax of ALTER INDEX. REBUILD. 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. Reindex WSUS Database using T-SQL Script. Also trying to avoid logging to transaction log and log growth, and. WITH (ONLINE = ON) Drop the existing columnstore index and run the query again. The second part of this tip is intended to reduce the duration for update statistics as it pertains to both. Thanks, I will try this next time. Msg 50000, Level 16, State 1, Procedure dbo. In general, two major factors affect the quality of a CCI: Compact rowgroups and metadata - The actual rowgroup count is close to the ideal count for the number of rows in the rowgroup. Click OK. It is causing other queries to wait, even simple ones like: SELECT * FROM tableName WHERE indexedColumn = @value. 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. ALTER INDEX [indexName] ON tableName REORGANIZE. ALTER INDEX. Expand the Tables folder. [TBLTest] REBUILD WITH (MAXDOP = 2) This statement executes successfully without errors but again, when I check the properties of the index it's still at 0. It's better to do reorg on Nightly. sqlの「create index」または「alter table」を使うことで、データベースのテーブルにインデックス（index）を付与することができます。sqlの「create index」または「alter table」を使うことで、テーブルのインデックス（index）を削除することができます。Alter EVENT SESSION [XeMerge] ON SERVER State = START. Index REORGANIZE operations are an excellent way to combine undersized rowgroups, assuming they do not suffer from dictionary size limitations. There's a difference between REORGANIZE and REBUILD. ALTER INDEX index1 ON dbo. ALTER INDEX [myIndex] ON [dbo]. DBREINDEX = rebuild a copy of the index (es) from scratch. Also, since this is a non-clustered index, you could drop and then create the index. If a nonclustered index is being rebuilt, a shared lock is held on the table in question during the operation. Select Allow online DML processing, and then select True from the list. [TableName] REBUILD PARTITION =. Right-click the index for which you want to set the max degree of parallelism and select Properties. DBREINDEX = REBUILD option "Rebuilding Indexes" +in this link. x), REORGANIZE is only used to compress CLOSED rowgroups into the columnstore. The LOB data types are image, text, ntext, varchar(max), nvarchar(max), varbinary(max), and xml. Rebuilding or reorganizing small indexes (which has 128 or less extents) often does not reduce fragmentation. x) implemented major performance improvements for these index operations. In this article. ALTER INDEX index1 ON dbo. Please sign in to rate this answer. Alter Index in PostgreSQL, Oracle, SQL Server. If ONLY is specified, only that table is altered. In the literature, I have read that, for heaps, you can write. " I'm modifying our index reorg/rebuild process to be sensitive to indexes that have ALLOW_PAGE_LOCKS turned OFF. Note: One thing ALTER INDEX does not allow you to do is change the set of columns that comprises the. Select the "RECLAIM_TS" tablespace by clicking the radio button. If the table (or rather: index) is partitioned, then you could consider rebuilding at partition level. 将所有打开和关闭的增量行组. It rebuilds a spatial index or a specified partition of a partitioned index. Contoh ini menunjukkan cara ALTER INDEX REORGANIZE kerja perintah. In Object Explorer, connect to an instance of Database Engine. To create a table. tables And then copying and pasting the output to a new query window and running that. Then try copying the data into a completely new table. In this example, disk space requirements to create a clustered index are determined. In Oracle, you can use the Alter Index Rebuild command to rebuild indexes. I manually fired reorganize index (ALTER INDEX cci_myindex ON dbo. 2 – Two minutes later, a background task is blocked by the index reorganize, waiting to acquire a schema modification lock to update the statistics for the same index. Ticket'). 3. The equivalent statistics update can be achieved by: UPDATE STATISTICS . Use the ReorganizeIndex Task dialog to move index pages into a more efficient search order. There was formerly an ALTER INDEX OWNER variant, but this is now ignored (with a warning). Shrinks AdventureWorks2014 to have 50% free space, runs shrinks in 25MB. Unfortunately, there is no way to run a partial organize (the way you can partially shrink a log file for example). The first part of this tip focuses on SQL Server Enterprise Edition to reduce the duration for index maintenance for off-line rebuilds. Reorganizing an index uses minimal system resources. ALTER TABLE myHeap REBUILD; And for clustered indexes: ALTER INDEX IX_myIndex ON myTable REBUILD; I have two questions:Hi Folks, Todays’ post is about the ‘Rebuilding the Indexes’ criteria used by the ConfigMgr Maintenance task when it runs as per schedule. Select Allow online DML processing, and choose True from the list, and then click OK. This tip will explore two features to speed up SQL Server index and statistics maintenance. If you want to rebuild an index the syntax is below: ALTER INDEX. Rebuilding an index drops and re-creates the index.