If a nonclustered index is being rebuilt, a shared lock is held on the table in question during the operation. However, sometimes you don't want this, say for read only tables or huge tables. But commit your whole transaction before reorganize. Disabling an index prevents user access to the index, and for clustered indexes, to the underlying table data. For the 'best possible' results REBUILD offline, with MAXDOP = 1, and SORT_IN_TEMPDB = ON. The name (possibly schema-qualified) of an existing index to alter. My_Table REBUILD WITH (ONLINE = ON , MAXDOP = 1, RESUMABLE = ON) Which executes successfully but doesn't seem to do anything. Now, let’s perform the REORGANIZE command on the index using the below T-SQL statement and look at the page allocation again. Otherwise you're holding an exclusive lock on the table/partition before you start the reorganize. Partitions can be rebuilt individually. REBUILD will not just rebuild index, but also force update of corresponding statistics. Your replica/ mirrors may fall behind. REORGANIZE) more than 30% logical fragmentation, rebuild it. [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 code first adds 1. 5% and < = 30% ALTER INDEX REORGANIZE 30% ALTER INDEX REBUILD WITH (ONLINE = ON)* Reorganize and Rebuild Indexes. The indexes can be reorganized using ALTER INDEX. The final post in this series will cover parallelism and the UPDATE STATISTICS command, and if. DBREINDEX = REBUILD option "Rebuilding Indexes" +in this link. REORGANIZE command (more details on this command and its usage are given below). 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. If I run the top query again, the index is still listed there with the same level of fragmentation. Dedicated SQL pool offers several indexing options including clustered columnstore indexes, clustered indexes and nonclustered indexes, and a non-index option also known as heap. If you’re using high availability features like Availability Groups or database mirroring that stream the log between replicas, generating a lot of log data very quickly can create problems. Catatan Di SQL Server 2012 (11. . その他のすべての句は無効です。. To work around this limitation perform an ALTER INDEX REBUILD instead of ALTER INDEX REORGANIZE or increase the file growth limit of any files that are full. column_name DISABLE; ALTER INDEX index_name ON table_name. Oracle maintains the validity of the indexes by rebuilding their leaf and (sometimes. 2: Syntax: ALTER INDEX ALL ON table_name REBUILD: Syntax: ALTER INDEX ALL ON table_name REORGANIZE: 3: Index should be rebuild when index fragmentation is great than 30% Index should be reorganized when index fragmentation is between 10% to. 2. Rebuild INDEX sort in tempdb. 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. It was trying to do so because when Index is. 13. To "enable", SET to 1. 그러므로 파일 그룹에 사용 가능한 빈 페이지가 있어도. ALTER INDEX ALL ON ExecQueryWaitStats REBUILD. ----- This article - Optimize index maintenance to improve query performance and reduce resource consumption helps you decide when and how to perform index maintenance. It. VeryImportantTable REBUILD; GO -- If you want to rebuild all the indexes on a table, try this code. 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. In order to complete they need a very high level of lock: a schema modification lock (SCH-M). ALTER INDEX (Transact-SQL) Pređite na glavni sadržaj. below line will remove the NULL value from the query. 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. SQL Agent doesn't connect as SA, and the rebuild index task generates a command that looks like ALTER INDEX [ci_FactInternetSales] ON [dbo]. ¿ Reorganize fragmented indexes. The code first adds 1. We would like to show you a description here but the site won’t allow us. gif」の説明. See this blog post for details. Index types. SSC Guru. In the Rebuild Indexes. ALTER INDEX ALL ON Adventureworks. The default is ON. [myTable] REORGANIZE WITH ( LOB_COMPACTION = ON ) I have the above query running for 16 days (still running),. Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance. For more information on ordered clustered columnstore indexes, see Performance tuning with ordered clustered columnstore index. if the index has: less than 5% logical fragmentation, don’t do anything; between 5% and 30% logical fragmentation, reorganize it (using DBCC INDEXDEFRAG or ALTER INDEX. In the literature, I have read that, for heaps, you can write. The MAXDOP index option cannot be specified in the ALTER INDEX REORGANIZE statement. Using this script, I receive an error. As the max possible rows in a row. ". Also, some tables/indexes will hardly be fragmented. Recommendations and examples for indexing tables in dedicated SQL pool in Azure Synapse Analytics. 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. Of course, they are head blockers (because it is Standard Edition, each ALTER INDEX command runs with ONLINE=OFF). And if it is a clustered index, the entire table is copied. Name + ' ON ' + T. Testing ALTER INDEX REBUILD with WAIT_AT_LOW_PRIORITY in SQL Server 2014. Ovaj pregledač više nije podržan. Whether you rebuild or reorganize indexes depends on the following guidelines: avg_fragmentation_in_percent value Corrective statement. In. Document table. Add B-tree nonclustered indexes for efficient table seeks. column_name DISABLE; ALTER INDEX index_name ON table_name REBUILD; ALTER. REORGANIZE) more than 30% logical fragmentation, rebuild it (using DBCC DBREINDEX or ALTER INDEX. Index automation Job script. ALTER INDEX . I have a MSSQL clustered index, which I want to rebuild, since I dropped some columns and I want to free space. Expand the Indexes node. If you run the query above, that gets information from the Dynamic Management Objects, and the index rebuild and reorganizations are running you will see information like this for the statement that is currently executing. Reorganizing an index only deals with the fragmentation that exists, and the more fragmentation there is, the longer a reorganize will take. Reorganize the index. Maybe I should explain. ), which reorganizes all the indexes on the. Unfortunately, there is no way to run a partial organize (the way you can partially shrink a log file for example). fragment_count : Number of fragments in an index (Continuous Pages) - Lower value is better 3. Designing efficient indexes is paramount to achieving good database and application performance. These values provide a rough guideline for determining the point at which you should switch between ALTER INDEX REORGANIZE and ALTER INDEX REBUILD. 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. 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. Regards Echo ALTER INDEX is in fact just an alias for the forms of ALTER TABLE that apply to indexes. . On the Standard bar, select New Query. 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. RedDk 31-Aug-13 15:32pm. TEST REORGANIZE WITH (COMPRESS_ALL_ROW_GROUPS = ON) With very large indexes, rebuilds take longer, generate more log, impact performance more while they’re running. A modification query runs before the. Points: 90153. ALTER INDEX CCI_fact_Sale_CCI_ORDERED ON Fact. We can see that the command completed successfully with ONLINE=ON. And again, the table undergoing index maintenance and the table in the. Reorganizing should be used at lower (<30%) fragmentations but only rebuilding (which is heavier to the database) cuts the fragmentation down to 0%. 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. Divides indexes in categories, and performs the default operations on each category: Indexes with low fragmentation (fragmentation is less than 5%) – No maintenance operations are performed; Indexes with medium fragmentation (fragmentation ranges between 5% and 30%) – The procedure will first attempt to reorganize indexes. The process of reorganizing an index-organized table requires four steps, as shown in the following series of images. Because of this I ended up with a huge number of row-groups (> 470. below is the script that i use to reorganize the index. indexoptimize" within my script that iteratates through the for me relevant tables, job seems to be. All other index DDL operations require additional temporary disk space to use during the operation, and permanent disk space to store the. To reduce the number of fragments, reorganize the full-text catalog by using the REORGANIZE option of the ALTER FULLTEXT CATALOGTransact-SQL statement. 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%. Ok i am confused, i was replacing my "alter index reorganize" part with the "execution dbo. Rebuild the index. [Table_Name] REBUILD WITH (FILLFACTOR = 80) OR - by using. b) ALTER INDEX {indexname} ON {tablename} DISABLE; 2) Truncate Table. If you have fragmentation, you need to REBUILD or REORGANIZE. And if the reorganize is a deadlock. August 1, 2013 at 3:52 pm. 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 than. I know the sql to perform this action on all indexes in a table is. After that I ended. The index reorganize operation will use single thread only, regardless of the SQL Server Edition used. For more information, see Columnstore index rowgroup. If ONLY is specified, only that table is altered. ) Then rerun the above free-space query again to see how the shrink worked: Free space after. INDEX. There are scripts out there that will go though and reorganize verses rebuild versus skip. 1) The first step is to export the data from the index-organized table. Also, since this is a non-clustered index, you could drop and then create the index. 2) The second step is to completely drop the table from the database. But short answer is that you want to look at ALTER TABLE. This clause is valid only for domain indexes in a top-level ALTER INDEX statement and in the rebuild_clause. indexes Ok i am confused, i was replacing my "alter index reorganize" part with the "execution dbo. x), REORGANIZE is only used to compress CLOSED rowgroups into the columnstore. Syntax ALTER INDEX {index | ALL} ON object DISABLE [;]. The first rebuilds a single index on a table and the second rebuilds all the indexes on the table. The syntax for rebuilding indexes is very simple, we just add the "WITH ONLINE=ON" clause to the ALTER INDEX command. 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. If you have any question, please feel free to let me know. Disable the index. SQL Server ALTER INDEX Syntax. March 1, 2013 at 1:53 pm. 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. 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. SELECT 'ALTER INDEX ' + I. Is it possible to update a COLUMNSTORE index in a DB transaction? I would like to use the following SQL command inside transaction: ALTER INDEX [IX_Name] ON [dbo]. Also when I try to reorganize or rebuild manually, using one of the following commands: use DBNAME. EXEC sp_MSForEachTable 'ALTER INDEX ALL ON ? REBUILD' There is no statement to do all tables in the database like you tried above. It's not documented to have a particular deadlock priority, and it does make data changes. One of the blocking scenarios I find most interesting is related to online index rebuilds. 1 million rows in 11. Possible failure reasons: Problems. Oracle Databaseのインデックスの再作成・変更SQL「alter index」とそのポイントを紹介します。 「alter index」は各種メディアやブログで紹介されており、指定できるパラメータも多くあります。 この記事では初心者向けにインデックスを再作成・変更する時の重要なポイントも合わせて紹介します。 In earlier versions of Microsoft SQL Server it could cause system slowdown to reorganize or rebuild a large index. Index Reorganize is a useful operation when your fragmentation is below 20-30 %, you do not need to change the original fill factor of your index and you are planning on doing index statistics update at a later point in time. ALTER INDEX . By droppring the index first, you don't need double space (old and new). To create SQL database maintenance plan, launch SQL Server Management Studio > expand the database instance > Management > right-click on the maintenance plan > New Maintenance Plan. This job needs to be scheduled and ran on a weekly basis due to large data. REORGANIZE is your option. Yes. REBUILD) These numbers are made up. ALTER INDEX __NAME_OF_INDEX__ ON __NAME_OF_TABLE__ REBUILD. _depth, index_level). Right-click the index for which you want to set the max degree of parallelism and select Properties. For example, consider There are 2 tablesONLINE options in Azure SQL DB, SQL Server 2008+. The total fragmentation value will be displayed. You can still run the index reorg/rebuild as part of your maintenance scripts. . alter index all on dbo. The only difference is that I replaced the WAITFOR command (used to wait for the tuple mover to kick in) with an ALTER INDEX REORGANIZE statement. Applies to: SQL Server 2012 (11. The following index operations require no additional disk space: ALTER INDEX REORGANIZE; however, log space is required. VeryImportantTable REBUILD; GO The second method is to reorganize indexes. PARTITION Only rebuild/reorganize one partition of the index. Are there any advantages or disadvantages to using " UPDATE STATISTICS (Index name) " as opposed to "ALTER INDEX (index name) ON. In SQL Server, the ALTER INDEX statement is used to modify an existing index. Once that is done, it executes the ALTER INDEX command to reorganize the index. REORGANIZE ), so that’s the topic for this post. Select the Compact large object column data checkbox to specify that all pages that contain large object (LOB) data are also compacted. The command I run is: ALTER INDEX [xxx] ON [xxx]. The fix is to update all rebuild index scripts. Starting with SQL Server 2016 (13. Monitor tempdb during rebuild operations. ドメイン索引を変更する場合は、索引の索引タイプに対してexecute. Frequency of the maintenance should be considered with the goal of minimizing impact of log generation. It reorgs indexes when fragmentation is below 30% else it rebuild the index. Perform ALTER INDEX ALL . Right-click the index that you want to rebuild online and select Properties. DROP INDEX when you are dropping a nonclustered index. Columnstore index, both clustered and nonclustered, can get fragmented like any other index. Share. x), use ALTER INDEX. In other words, the progress of index reorganization cannot be obtained before SQL Server 2008. It checks the SQL Server licences, if Enterprise it will rebuild the index online else it. For an [!INCLUDEssazuresynapse-md] table with an ordered clustered columnstore index, ALTER INDEX REORGANIZE does not re-sort the data. [TableName] REBUILD PARTITION =. IndexOptimize is the SQL Server Maintenance Solution’s stored procedure for rebuilding and reorganizing indexes and updating statistics. One can also. ----- This article - Optimize index maintenance to improve query performance and reduce resource consumption helps you decide when and how to perform index maintenance. Expand the Indexes folder. Using the REBUILD or REORGANIZE options of the ALTER FULLTEXT CATALOG statement. First off: ‘Reorganize’ and ‘Rebuild’ are two different operations that each reduce fragmentation in an index. The SQL Server Database Engine automatically maintains indexes whenever insert, update, or delete operations are made to the. Your replica/ mirrors may fall behind. In Oracle, you can use the Alter Index Rebuild command to rebuild indexes. Everything is the same - configuration, CPU, RAM, disk drive layout, similar (but not the same) database with similar data and workload. ALTER INDEX ALL ON [table_name] REORGANIZE; However, if you want to rebuild all the indexes on the. 000). [User] REBUILD [SQLSTATE 01000] (Message 0). We choose "All databases, leave the default values of two other options and click "OK". The new name for the index. -- Create a database CREATE DATABASE [ columnstore ]; GO -- Create a rowstore staging table CREATE TABLE [ staging. To create a table. This allows you to interrupt the rebuild and preserve the work already done. Run this command: 1. I think there is another way to rebuild fragmented index, You can create an sp and scheduled it via SQL Server Agent or via task scheduler. An ‘ALTER INDEX REBUILD’ statement was executed on object ‘dbo. ALTER INDEX ALL ON [Database_name]. Select Maximum degree of parallelism, and then enter some value between 1 and 64. One of the major reasons I wrote DBCC INDEXDEFRAG for SQL Server 2000 was as an online alternative to DBCC DBREINDEX. I use SQL Server 2008 R2, I need to rebuild the index for every table in a database. With very large indexes, rebuilds take longer, generate more log, impact performance more while they’re running. Create a maintenance plan. or to reorganize use: ALTER INDEX __NAME_OF_INDEX__ ON __NAME_OF_TABLE__ REORGANIZE. However, I would recommend researching scripts others have written that are well tested and used by. Let’s use DBCC SHRINKDATABASE to reclaim the empty space. 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. To reorganize an index, the following command can be used: ALTER INDEX IX_Employees ON Employees REORGANIZE; To change the fill factor of. Large tables should be in their own full-text catalog. ALTER INDEX cindex ON. alter the column as VARBINARY(MAX). The table has an NVARCHAR (MAX) column. Right-click the index that you want to modify and then click Properties. 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. Compressed rowgroups - Rowgroups are using columnstore compression. Change the index option settings. More actions . Starting with SQL Server 2016 (13. Is this possible to do?Unlike DBCC INDEXDEFRAG, or ALTER INDEX with the REORGANIZE option, DBCC DBREINDEX is an offline operation. The results for this command are up for comparison against the Alter Index Rebuild command. This is inexpensive, online, and will generally keep an index defragmented enough for efficient use for quite a long time. myTable REBUILDIt sets deadlock priority to 10 (the highest possible value), then performs inserts and deletes until >50% index fragmentation is achieved. Yes. a) if possible. 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. Note that ALTER INDEX REORGANIZE cannot reduce page fullness. [TableName] REBUILD GO-- Check that only clustered index is enabled SELECT OBJECT_NAME (OBJECT_ID), Name, type_desc, is_disabled FROM. 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. This tip will explore two features to speed up SQL Server index and statistics maintenance. Update COLUMNSTORE index in DB transaction. Beginning with SQL Server 2016 (13. 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. PARTITION Only rebuild/reorganize one partition of the index. I already tried an ALTER INDEX REORGANIZE just in case. INDEXDEFRAG = defragments page by page. The second part of this tip is intended to reduce the duration for update statistics as it pertains to both. The database free space would be reduced to 50MB. Msg 50000, Level 16, State 1, Procedure dbo. LOB_COMPACTION Compacting large object (LOB) data can reduce the disk space used. Reorganize indexes in a table using Transact-SQL. Use the ReorganizeIndex Task dialog to move index pages into a more efficient search order. 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. 14. I don't agree with Kin this is a knee response that will be a least help. Alter Index in PostgreSQL 9. REBUILD Is a BLOCKING operation, unless you have SQL Server Enterprise Edition. Index automation job script. Our Production instance is running SQL Server 2014. Next, let us build only the clustered index and see the output of all the indexes. Select the "RECLAIM_TS" tablespace by clicking the radio button. ALTER INDEX [NameOfTheIndex] ON [SchemaName]. dm_db_index_physical_stats. Reorganize is. indexoptimize" within my script that iteratates through the for me relevant tables, job seems to be. 1 additional answer. RESUMABLE = ON means you can pause the index. Too many full-text index fragments in the full-text index, can lead to substantial degradation in query performance. The tablespace to which the index will be moved. REORGANIZE index. alter index reorganize を使用してこれらの行グループを列ストアに強制的に変換した後、小さい圧縮された行グループを、より大きい圧縮された行グループに結合できます。 再構成操作では、削除対象としてマークされた行も、列ストアから削除されます。1 – Index reorganize starts from a SQL Agent job. 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. Below is an example of this technique, where the @PartitonNumber value can be changed in a restart scenario. Acest browser nu mai este acceptat. 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. It is a more online-ish compared to rebuild. In Object Explorer, connect to an instance of Database Engine. ¿ Indexes should be checked regularly if they have more leaf blocks than the table. 5. I'm modifying our index reorg/rebuild process to be sensitive to indexes that have ALLOW_PAGE_LOCKS turned OFF. It defragments the leaf level of clustered and nonclustered indexes on tables and views by physically reordering the leaf-level pages to match the. There were questions regarding which indexes are actually rebuild touched and what are not. . REBUILD to rebuild the in-row data of the heap, as well as all data of the indexes, and re-enable them. -- Test 2: ALTER INDEX REBUILD-- Rebuliding should work fine ALTER INDEX [PK_TableName] ON [dbo]. Document table. GO. The per-row group state of the delete bitmap can be seen in the sys. Also, it is possible to do it with the help of SSMS (SQL Server Management Studio): Choose the database and then the table where you want to Reorganize and. REORGANIZE statement removes deleted rows, based on an internally defined policy, from the columnstore as an online operation. Index rebuilds are only mostly online. Expand the Tables folder. You must rebuild each partition or subpartition. -- Create a database CREATE DATABASE [ columnstore ]; GO -- Create a rowstore staging table CREATE TABLE [ staging ] ( AccountKey int NOT. Your script is actually command to issue reorg and rebuild statement based on other part of code which is not copied here. REORGANIZE index. This means you will need less free space in your user database during an index rebuild operation and more free space in tempdb. Jeffrey Williams. I suspect the reorganize is compacting the index after the rebuild and thus moving quite a bit of data around. REORGANIZE or REBUILD (as suggested already). x) and in Azure SQL Database, we recommend using ALTER INDEX REORGANIZE instead of ALTER INDEX REBUILD for columnstore indexes. Dedicated SQL pool offers several indexing options including clustered columnstore indexes, clustered indexes and nonclustered indexes, and a non-index option also known as heap. The Reorganize Index task encapsulates the Transact-SQL ALTER INDEX statement. myTable REORGANIZE WITH (LOB_COMPACTION = ON)) which took around 5 hours to complete. –Rebuild/Reorganize indexes on all the tables on a database based on the fragmentation. To rebuild an index means to create anew one, then drop the old one. Select Options under Select a page. Hi, The widely used thresholds are: Reorganize if fragmentation is between 10-30%. • DROP INDEX when the user drops a clustered index with offline setting without specifying a MOVE TO clause and there are no non-clustered indexes in the file. 13. Sorted by: 2. ALTER INDEX [myIndex] ON [dbo]. Thanks for your. Wednesday, December 26, 2012 - 3:13:45 PM - Christina: Back To Top (21140) I need to loop the following script through all databases. In SQL Server 2017, first, create the index without the online option. Right-click the index you want to reorganize and select Reorganize. To re-sort data, use ALTER INDEX REBUILD. There is a similar case for your reference: Check progress of alter index reorganize / rebuild. There's a difference between REORGANIZE and REBUILD. Answers. Keep in mind that, depending on the amount of indexed data, a master merge may take some time to complete. alter index ALL on dbo. This is a best practice for performance when you rebuild or reorganize indexes. ALTER INDEX ON REORGANIZE . Henrik Høyer. 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. In this article. In the Rebuild Indexes dialog box, verify that the correct index is in the Indexes to be rebuilt grid and click OK. Alter Index in PostgreSQL, Oracle, SQL Server. ROIR_Test4 REBUILD WITH ( RESUMABLE = ON, ONLINE = ON ); The result is quite sad: Msg 11433, Level 15, State 1, Line 17 'ALTER INDEX ALL' with RESUMABLE option is not. I have an index rebuild and reorganize script to alter rebuild or alter reorganize based on fragmentation in SQL Server. Open the Tables folder & expand it. Select Allow online DML processing, and then select True from the list. 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. Disabling indexes. 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. However, the REBUILD still needs to take a lock for a moment to swap the old index for the new index. In PostgreSQL, ALTER INDEX command changes the definition of an existing index. -- Test 2: ALTER INDEX REBUILD-- Rebuliding should work fine ALTER INDEX [PK_TableName] ON [dbo]. It. Newer controls on the Maintenance Plan user. The name of an index-method-specific storage parameter. The length of time the rebuild takes is related to the size of the index, not the amount of fragmentation in it.