Index Rebuild : This process drops the existing Index and Recreates the index. The documentation is also indicating that: Online index operations are not available in every SQL Server edition. Compaction is based on the existing fill. Instead of our phone book having 1,000 pages that are 100% full, we might have 1100 pages that are only 90% full. This issue can be solved by reorganizing or rebuilding the index. [Subscribers] REBUILD; You can replace REBUILD with REORGANIZE in the above query to. WITH FULLSCAN Are there any advantages or disadvantages to using "UPDATE STATISTICS (Index name)" as opposed to "ALTER INDEX (index name) ON. 7. You can read more on rebuilding indexes here . The sys. You cannot say, “If the index is 45% or more fragmented, rebuild it– otherwise do nothing. Rebuild or reindex ?? good question ! Analysis indexes defragmentation RATIO and decide to REORGANIZE OR REBUILD. 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. Index automation Job script. Inadequate disk space can degrade performance or even cause the index operation to fail. Index Rebuild vs Index Reorganize. Let’s first drop the Clustered Columnstore index that we created above using the below command. In this article. Microsoft recommends Index Rebuild operation to defrag indexes if the fragmentation level of your index is greater. Another possibly is that the index is being rebuilt and then re-fragmenting again. Rebuilds are generally faster. g. The performance of large WSUS deployments will degrade over time if the WSUS database isn't maintained properly. Depending on INSERT, UPDATE and DELETE activity against your tables, your physical data can become very fragmented. The documentation is also indicating that: Online index operations are not available in every SQL Server edition. -- 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. 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. #1258597. Here are a couple of examples. Also, up to SQL Server 2008 R2, you could not perform online rebuild on Large Object (LOB) data: varchar(max), nvarchar(max), varbinary(max), or XML. It's a great piece of work - it allows you to define fragmentation levels for which you. In this article. index_resumable_operations; We can see that we have paused the online. For now, I have just turned off the weekly index reorganize task which is not really a good long term solution. before i answer your question is the database on simple recovery. With the SQL performance analyzer in DPA, DBAs can check SQL index fragmentation on the server and get pinpointed advice about wait times, SQL statements, and the actual workload—across the past five seconds or five years—they. Use the Rebuild Index Task dialog to re-create the indexes on the tables in the database with a new fill factor. All they do is waste space and resources. -Search all indexes of a table that have 5% or more of. The Reorganize Index task encapsulates the Transact-SQL ALTER INDEX statement. 1) Since its indexes are not reorganized before. To create a new job, right click on SQL Server Agent, select New and then Job. sql file. SELECT OBJECT_NAME(ind. Our Production instance is running SQL Server 2014. To fix the fragmentation either rebuild or reorganize the index on the table. Reorganize a fragmented SQL Server index and optimize performance. or to reorganize use: ALTER INDEX __NAME_OF_INDEX__ ON __NAME_OF_TABLE__ REORGANIZE. Recommend 7 or less. Rebuild and Reorganize Index using SQL Server Management Studio (SSMS) Find and expand the table in Object Explorer >> Open Indexes >> Right-click on the target index >> Rebuild or Reorganize. All you might notice is a drop in performance executing queries while the indexes are gone but dropping and creating a (none-clustered) index has no impact whatsoever on the actual data stored in your tables (Creating a clustered index impacts the physical ordering of your data but again, no data. Hallengren website has an option to reorganize indexes say with 5% Fragmentation, and rebuild for 30% Fragmentation. Article. ALTER INDEX __NAME_OF_INDEX__ ON __NAME_OF_TABLE__ REBUILD. Scale back down once the index rebuild is complete. If the tables get more than 15% fragmented, performance is very negatively affected. SQL Server 2019 adds resumable online index creation, and it’s pretty spiffy: 1. Bulk amount records are deleted and updated frequently. 1. 1. I used the sp_who2 procedure to see which queries were waiting, and which other query they were blocked by. The reason given is that the indexes and statistics are partly based on available CPU and memory resources. Monitor tempdb during rebuild operations. Designing the SQL Server Reorganize Index Task The script below allows you to rebuild indexes for all databases and all tables within a database. Hi @Devendra Kumar Sahu , You can perform a reorg or rebuild an index based on its fragmentation values. Designing efficient indexes is paramount to achieving good database and. Then, choose New, Job to create a SQL agent job. Therefore, focus on the larger indexes because their pages are less likely to be cached by SQL Server. As well as maintenance plans, SQL Server Agent jobs are also a handy way to automate and schedule index defragmentation jobs in SQL Server. Monitor and track your index usage, or lack of index usage. 3,895 9 51 78. Select the Update Statistics maintenance task from the list of tasks. Then, drag and drop Rebuild Index Task into the maintenance plan designer. The first rebuilds a single index on a table and the second rebuilds all the indexes on the table. The detailed information can also be useful to determine whether your dedicated SQL pool is being impacted by a large number of small, fragmented tables, which can lead to delays in compilation. Syntax ALTER INDEX index_name ON table_name. Eliminate all deleted rows. When an index becomes skewed, parts of an index are accessed more frequently than others. index_id = 0 -- Heap or table indexstats. The index uses the main filters on the sales table from the time dimension, i. Index Rebuild operation first drops and then recreates the index. Then, drag and drop Rebuild Index Task into the maintenance plan designer. You can do maintenance in phases, where each maintenance phase covers a subset of. SQL Server index fragmentation is unavoidable, but you can minimize the negative effects of fragmentation on database performance. Mar 8, 2021, 2:47 PM. ALTER INDEX [myIndex] ON [dbo]. SQL Server 2017 includes a new system view sys. 1. When I run alter index index [IndexName] on dbo. index rebuild/reorganize frequency. Create a job to run your index reorganize ('Reorganize'). SQL Server - Reorganize and Rebuild Indexes :. 21 Code: 0xC0024104 Source: Reorganize Index Task Description: The Execute method on. DROP INDEX when you are dropping a nonclustered index. 3. You can apply a new fillfactor when you rebuild an index. DROP INDEX when you are dropping a nonclustered index. Stop. In both these scenarios they are blocked by session 54 – the index rebuild. x) および SQL Server 2014 (12. For example, one of the indexes with a page_count of 967 has a fragmentation percentage. Obtain the script from the source DB (SMO or MSSQLTips ), change the FILLFACTOR and PAD_INDEX then execute against the new DB. Resolution: Reorganize and rebuild indexes. dm_db_index_physical_stats in a script to rebuild or reorganize indexes). 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. Here a Microsoft Engineer states that in most scenarios is not needed, but in the same forum thread I shared my experience step-by-step with images on how you can schedule a database maintenance on Azure SQL. Right-click on the index and select Rebuild. The procedure uses SQL Server ALTER INDEX command, with the REORGANIZE option NULL. index_id > 0 -. Proceed to the Steps tab: Clicking on New. From a transaction log standpoint, reorganize index generates a lot more small transactions and can lead to substantially more resource-consumption than a rebuild. Rebuild the Indexes if the Fragmentation level is > 30%. 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. DROP INDEX KIDS1. 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. 100% complete End Progress Error: 2016-06-10 22:30:23. There is all reason to only rebuild index that are fragmented, and a good maintenance. SQL Fool (Michelle Ufford) has a great script to do this for you - all done and well tested by many users. _in_percent > 50 AND ss. In the Object Explorer panel locate the database in question, and use right mouse click to bring up the context menu. In Object Explorer, Expand the database that contains the table on which you want to reorganize an index. 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. You can use sys. INDEX_REORGANIZE Reorganizes the index. g. we have 5 databases in our instance, in that 2 databases are online and remaining are in offline. So now once you have identified the high fragmentation level in your database, which could. Reorganizing an index uses minimal system resources. Rebuilding indexes with a new fill factor makes sure that database pages contain an equally distributed amount of data and free space. Microsoft recommends fixing index fragmentation issues by rebuilding the index. 1. x), you can create nonclustered B-tree or rowstore indexes as secondary indexes on a clustered columnstore index. Each night the maintenance plan is successful, but these commands take the longest to execute 3 hours, 3 hours and 5 hours respectivelly. For more information about this enhancement, check the SQL Server 2016. Specify the name of the maintenance plan. dm_db_index_physical_stats (Transact-SQL). There is all reason to only rebuild index that are fragmented, and a good maintenance. Reorganizing an Index should be done when you have elevated amounts of white space within your index (i. This means loading the table and building all nonclustered indexes before moving on to the next one. I don't remember if IDENTITY INSERT ON will help. we are using Ola index job to rebuild and reorganize the index. This index design guide contains information on index architecture, and best practices to help you design effective indexes to meet the needs of. INDEX index-name Specifies the index to use when reorganizing the table. Regards. To update all statistics in a table. August 1, 2013 at 3:52 pm. T-SQL Alter Index. For example, LDAPDB2. Depending on the type of index and the Database Engine version, a rebuild operation can be done offline or online. Rename. ". I suggest 50% for REORGANIZE, 80% or even 90% for REBUILD. REBUILD will not just rebuild index, but also force update of corresponding statistics. Reorganize does not holds blocking locks. Sorted by: 2. It shouldn't be used on. Unlike DBCC INDEXDEFRAG, or ALTER INDEX with the REORGANIZE option, DBCC DBREINDEX is an offline operation. The first part of this tip focuses on SQL Server Enterprise Edition to reduce the duration for index maintenance for off-line rebuilds. Rename. ALTER INDEX [myIndex] ON [dbo]. If a nonclustered index is being rebuilt, a shared lock is held on the table in question during the operation. For more information, see Specify Fill Factor for an Index. After rebuilding all indexes, some queries seem to take forever for at least two queries/tables. If you don’t spend much time with SQL Server and you. When you rebuild, SQL creates a new fresh index. 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. As tables grow and shrink, this fragmentation can ultimately play a role in how well SQL runs. Depending on database and indexes size it will grow. 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. I also removed the the second part of the case statement that uses REORGANIZE. Click the plus sign to expand the Tables folder. Use the ALTER TABLE command to rebuild the Heap. Workaround. x) implemented major performance improvements for these index operations. No right from SQL Server 7. Here's another script to add to the list. When you create or rebuild an index, by setting the SORT_IN_TEMPDB option to ON you can direct the SQL Server Database Engine to use tempdb to store the intermediate sort results that are used to build the index. When rebuilding your indexes, be sure that you allocate enough memory to the session that rebuilds your index. Therefore, you do not need to update statistics after performing ALTER INDEX REBUILD, DBCC DBREINDEX, DBCC INDEXDEFRAG, or ALTER INDEX REORGANIZE operations. The database is using the Simple Recovery model. SELECT a. Locking. To solve this, I want to use the REORGANIZE operation every time. is_ms_shipped = 0 --Excludes any objects created as a part of SQL Server installation AND ss. The scripts has some cool features like. The documentation for alter index, for example, shows that it accepts an index_name, not an expression that might evaluate to an index name. Solution. For more information, see Data Types (Transact-SQL). If the index you wish to reorganize is not listed in the “Indexes to be reorganized” section, ensure that it has been added to this section and then click the “OK” button. I'm currently using the approach described here: sys. In the infrequent cases where you do need to reorganize or re-build index, consider these: Run index maintenance during off peak period. 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. I want to rebuild or reorganize indexes in a table. 2. August 21, 2010 at 11:54 pm. The possibility to. Note The commented fnMs_GenerateIndexMaintenanceScript function is a table-valued function (TVF) that can. It can be. set @SQL = 'alter index ' + QuoteName ( @IndexName ) + ' on ' + QuoteName ( @TableName ) + ' rebuild';. If there are frequent changes to the full-text catalog, use this. You could also refer another query which may be helpful to you. On the Standard bar, select New Query. If you don’t spend much time with SQL Server and you. It is causing other queries to wait, even simple ones like: SELECT * FROM tableName WHERE indexedColumn = @value. Rebuild if > 30%. Near the top of the script, around line 32, you will see a line of Transact-SQL code that looks like this: 1. REORGANIZE, UPDATE STATISTICS and a simple SELECT statement. You can also see if a reorganize will help until you can do a full rebuild. [Test] REBUILD WITH (ONLINE = ON); Additionally, I would only rebuild indexes which require it. Select Maximum degree of parallelism, and then enter some value between 1. If you what you are saying is true, even reorganizing the indexes that have never been, may. You also can create a linked server to SQLAZURE and create a sql agent job. 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. Over here it will display all the indexes of the table and you can just click OK. From all the research I've done, I can't really find any indication of why you would want page fullness to be low, and am anticipating that I'll want to do an index reorganize operation to set the value to. 3. SQL Server 2012 (11. Everything is the same - configuration, CPU, RAM, disk drive layout, similar (but not the same) database with similar data and workload. · Add the startup option -T1222 to SQL. –In this article. This is quite a big problem in SQL Server, as your indexes will fragment over time. The Reorganize Index task encapsulates the Transact-SQL ALTER INDEX statement. 1. – 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 length of time the rebuild takes is related to the size of the index, not the amount of fragmentation in it. 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. Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW) Convert a rowstore table to a clustered columnstore index, or create a nonclustered columnstore index. Reorganizing an index only deals with the fragmentation that exists, and the more fragmentation there is, the longer a reorganize will take. Now. I was going to take a look at Ola Hallengren's scripts and some other stuff but wanted to see if there was possibly a simple explanation for this. From a transaction log standpoint, reorganize index generates a lot more small transactions and can lead to substantially more resource-consumption than a rebuild. I have configured Ola Hallengren's backup and integrity check scripts. One or more of the databases used by SharePoint Server have fragmented indexes. ) Index Size is greater than 5 MB's. [Subscribers] REBUILD GO Rebuilding all indexes in a table USE [SQLMaestros] GO ALTER INDEX ALL ON [hol]. 2. The maintenance plan. This tip will explore two features to speed up SQL Server index and statistics maintenance. 2 contributors. The only. Users(DisplayName) WITH (ONLINE = ON, RESUMABLE = ON, MAX_DURATION = 1); Those parameters mean: ONLINE = ON means you’ve got the money for Enterprise Edition. For more information, see the article: Gathering SQL Server indexes statistics and usage information. The import process should be reworked to bulk-load one table at a time. The only way to remove wasted space and restore the correct page ordering is to rebuild or reorganize the indexes on a regular basis. x), you can create nonclustered B-tree or rowstore indexes as secondary indexes on a clustered columnstore index. Test all three and see which is fastest and which gives the least index fragmentation. If a nonclustered index is being rebuilt, a shared lock is held on the table in question during the operation. The schema is the user name under which the table was created. e. Note: You can select “Reorganize All” to reorganize all the indexes in the table If the index you wish to reorganize is not listed in the “Indexes to be reorganized” section, ensure that it has been added to this section and then click the “OK” button. If you what you are saying is true, even reorganizing the indexes that have never been, may cause a larger impact on the server as well. Reorganize Index. . This removes fragmentation, reclaims disk space by compacting the pages based on the specified or existing fill factor setting. 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. ) rebuilt all indexes on the table. In it, enter the Job name, owner, optionally Category. Our Production instance is running SQL Server 2014. The syntax for rebuilding indexes is very simple, we just add the "WITH ONLINE=ON" clause to the ALTER INDEX command. Microsoft recommends Index Rebuild operation to defrag indexes if the fragmentation level of your index is greater. Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance When you perform online index operations, the following guidelines apply: Clustered indexes must be created, rebuilt, or dropped offline when the underlying table contains the following large object (LOB) data types: image, ntext, and text. Right-click the index that you want to rebuild online and select Properties. When I ran the query again, this was the result: Fragmentation over 70% for 12 indexes, over 30% for 15 indexes. SQL. dm_db_index_physical_stats fincation have index_id which display heap and index informatiob. Rules For Index Maintenance: 1. Note In SQL Server 2012 (11. Your new index will have the size non less than the size of disabled index. I still see questions about SQL Server 2000/2005 pop up on Stack Exchange. Someone else set it up. That's why as a rule of thumb, for fragmentation greater than about 30%. Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW) Poorly designed indexes and a lack of indexes are primary sources of database application bottlenecks. There are two options that can be used: Reorganize pages with the original amount of free space - this will use whatever was specified when the table was createdThe WSUSDBMaintenance script is a T-SQL script that can be run by SQL Server administrators to re-index and defragment WSUS databases. Reorganizing an index uses minimal system resources and is an online operation. Create an agent WMI alert ('Reorganize Relief Valve') on a performance condition. ALTER INDEX index_name ON table_name REORGANIZE OR. In the SQL Management Studio Console, expand Management > Right Click Maintenance Plan and select Maintenance Plan Wizard. For instance, in the Maintenance Plans of SQL Server 2017, it is possible to rebuild only those indexes where fragmentation level is higher than a specific percentage and has more pages than specified in "Page Count". Over here it will display all the indexes of the table and you can just click OK. For now, I have just turned off the weekly index reorganize task which is not really a good long term solution. @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. 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. Clustered Columnstore Indexes, as well as “regular” indexes, support the Rebuild and Reorganize operations. 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. 4. The length of time the rebuild takes is related to the size of the index, not the amount of fragmentation in it. As a generally accepted good practice reorganize only when ragmentation of index is between 5 to 30 % for anything more than that rebuild the index. It is recommended to use an integer data type in the index. So let’s take one thing at a time. The T-SQL script in this article can be run by SQL Server administrators to reindex and defragment WSUS databases. Applies to: SQL Server. I have many DBs that are currently used for insert and delete. Navigate to Tasks / Shrink / Database. There are two options to fix fragmentation. Summary: SharePoint Server uses SQL Server to store most of the content for the Web site and configuration settings. Right-click the index for which you want to set the max degree of parallelism and select Properties. Index maintenance usually starts 3 hours before the database full backup and ends before the full backup start. Does database on which tables reside have database owner. I suggest 50% for REORGANIZE, 80% or even 90% for REBUILD. Let us create a Heap Table and insert some records in it and then check the fragmentation. Reorganizing an index defragments the leaf level of an index by physically re-ordering pages to match the logical order. A clustered index's key columns are called a clustering key. skNumber) AS. Additionally, after reorganizing indexes it is reasonable to update the statistics as this operation does not update the statistics like the index rebuild operation. Defragmentation in Practice. If you look into the sys. I want to rebuild or reorganize indexes in a table. Coming to update stats, I would prefer to do it with Full Scan depending on the size of the databases. Use a columnstore index to efficiently run real-time operational analytics on an. Identifies indexes that are fragmented and defragments them. If an index is between 10% and 30% fragmented, I will REORGANIZE the index and UPDATE the statistics. For general guidance regarding index fragmentation, when fragmentation is between 5% and 30%, reorganize the index. If the index is disabled, rebuilding brings it back to life. Index rebuilds (not index reorganise) always do a fullscan update of the statistics. The Full-Text Engine compiles and executes full-text queries. #1637994. Reorganize Index Task Forum – Learn more on SQLServerCentral. Object: SQLServer:Databases; Counter: Percent Log Used ; Instance: (your big database name) Alert if counter rises above: 80; Response: Execute job ('Reorganize Check') Create a job ('Reorganize Check') Rebuilding a clustered columnstore index is an offline operation until SQL Server 2019 when the ability to rebuild online was introduced. Expand the Indexes folder. Create table and compressed index. Jan 11 at 14:24. This job needs to be scheduled and ran on a weekly basis due to large data load. If you need more tempdb space, scale up the pool. 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. Someone else set it up. You can also set a threshold so that it only considers indexes over a certain size so you're not doing unnecessary rebuilds on tiny indexes. Maybe I should explain. To learn more about index rebuild and reorganize operations, review this tip. Last weekend the index maintenance took more than 5 hours and the full backup was running at the same time. Creating a SQL Server Maintenance Plan. ” Select the vault database(s). you are reading your query result incorrect. do nothing; reorganize an index; rebuild an index; Don't reinvent the wheel - just go see and use the script!I am a new DBA to a SQL 2005 production Report server. The Reorganize Index task also includes an option to compact large object data. Select the Compact large object column data checkbox to specify that all pages that contain large object (LOB) data are also compacted. The more the fragmentation you need to rebuild if its less you can reorganize. The alternative for online rebuilding is to create a new index using CREATE INDEX CONCURRENTLY, then drop the old. Coming to the point out of all there is a database with 51Gb, yes we have seen some big tables majorly occupying space in db. GO. It's a great piece of work - it allows you to define fragmentation levels for which you. This statement essentially merges all the fragments. 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. The log size shouldn't be unrestricted. Many people (and even solutions) in the SQL Server community say you need to look at Index Fragmentation levels (e. 1. Copy and paste the following example into the query window and select Execute. 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. Note that the time it takes to complete the operations depends on the size of the database and how fragmented the indexes. This opens the Toolbox and the maintenance_plan_name [Design] surface with the Subplan_1 subplan. 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. Change it to be weekly or even less frequently. 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. Make sure to thick the Enabled checkbox. Heaptest default values go 50 select. Rebuild/Reorganize working fine. The first and most popular method is to rebuild indexes. Reorganizing Indexes. 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. The Full-Text Engine in SQL Server is fully integrated with the query processor. 1. If you search for index rebuilding, you will find many complex scripts on the web, but this can also be done. If the index. Click OK. It should not be used on WSUS 2. We are using clustered columnstore index in SqlServer 2016 for 400M rows. Use Ola Hallengren ‘s IndexOptimize but don’t use his defaults. Provide a name for your maintenance plan and click Next to choose the tasks we want to include in our maintenance plan. In Object Explorer, connect to an instance of Database Engine. You need to assemble the SQL prior to calling SP_ExecuteSQL, i. . The alternative is to do an index reorganize, either using my old DBCC INDEXDEFRAG or the new ALTER INDEX. For a dedicated SQL pool table with an ordered CCI, ALTER INDEX. May be index was not there, may be you were just rebuilding the index. However, you can create a staging table insert all rows into that, drop original table and rename staging table to original. 3) Reorganize indexes. SQL Server development version and Enterprise version has option ONLINE, which can be turned on when Index is rebuilt. Click the plus sign to expand the table on which you want to rebuild an index online. Product REORGANIZE GO. 3番目のパラメータは、Non ClusteredインデックスID（sys. Unfortunately I didn't try the reorganize between the above 2 troubleshooting steps, so I am not sure which one did the trick, but i am leaning towards the PK. This happens approx. The Query Optimizer. #1162454. Your could find your indexes are 95% plus fragmented, affecting query performance badly. Because this is an online operation, the index is available while the statement is running. index_type_desc AS IndexType, indexstats. Copy and paste the following example into the query window and click Execute.