31, the table and index data collection is enabled by default during installation. Image is no longer available. When you dig down through my computer to the properties for the drives, and hit the "defragment" button on. Identify Skewed and Outdated Index and Column Statistics and Ensure they are Representative and Up-to-DateAs stated though you would need to shutdown SQL Server, or at least take the DB offline to do an OS Defrag. Defragment Indexes. ApexSQL Defrag is a SQL Server index monitoring and analysis 3 rd party tool that is used to monitor and manage SQL index defragmentation operations in SQL Server. fulltext_index_fragments to query for the number of queryable fragments (status = 4 or 6) in the full-text index, as follows: SELECT table_id,. Remarks. A. This index uses column-based data storage and query processing to achieve gains up to 10. Identify this using DBCC SHOWCONTIG (in SQL 2000) or sys. I have some fragmented indexes on my production databases. For an index, only the parent-level pages of the B-tree (that is, the pages above the leaf level) are scanned. Hi @Boopathi Subramaniam , Thanks for posting in Microsoft Q&A forum. In addition,. The other thing you can do, for when you do need to defragment indexes (if for example you have deleted a large amount of data), is using SQL Server's Service Broker to set up the maintenance plan for multiple tables in a batch. Review Index Fragmentation Report in SQL Server 2005 and 2008 tip. Find and remove unused indexes – everything that is unused doesn’t do anything good. For the SQL Servers we manage for our. It’s advisable to remove those often. Check indexes from the index grid and click desired defragment operation from the ribbon. And if it is a clustered index, the entire table is copied. 2 (X64). DO: Implement appropriate index fill factors. index_id. Defragmentation improves disk space and. If not specified, all non-system databases plus msdb and model will be defragmented. It depends on the degree of fragmentation of Indexes. Also even though SQL allocates in 8K blocks having to move the disk head all over the place leads to much slower access times. The operation only requires an intent-shared (IS) table lock. In a perfect world our C drive would be optimally configured, almost static, but in the real world we often have many files on the C drive including system databases, log files, BCP files etc. Set log file to start at 1 GB. Our DBs are 24/7, so we need a minimally-invasive strategy. set @current_sql = (select top 1 Reorganize_SQL from @fragmented_indexes) execute sp_executesql @current_sql--select. On version 2019 it runs for over 30 minutes. Review CREATE INDEX. 11,485 questionsHow to monitor the status of index defragmentation jobs. Index fragments occur when any transaction takes place in database table. According to Microsoft guidelines, based upon index fragmentation percentage, we may choose to either REORGANIZE,. index_type_desc AS IndexType, qs. dm_db_index_physical_stats DMF to. dm_db_index_physical_stats there you can detect fragmentation in a specific index, all indexes on a table or indexed view, all indexes in a database, or all indexes in all databases. DBCC SHRINKFILE does what the name implies. Fragmentation typically happens owing to insert, update and delete transactions. Right click the index, click Properties, then click Fragmentation to see the fragmentation and page fullness percentages. This reversed the defragmentation step and gave them a database with nearly 100% fragmentation. Review ALTER INDEX command on MSDN. 2027. USE DatabaseName –Need to Specify the User Database Name. Indexes play a critical role in SQL Server query performance. g. Automatic index and statistics management. (When Tempdb is corrupted) as we ALL know that it gets recreated when a SQL Server restart is done, but Tempdb files are not deleted when you restart SQL Server and are also not 0. SQL Server Internal Fragmentation SQL Server Internal Fragmentation is caused by pages that have too much free space. This must. It can be done with online option in enterprise edition. Proceed to the Steps tab: Clicking on New. SELECT CASE WHEN indexstats. You’d have to set this up on your own. This to me would be a sign that constant rebuilds of that index actually aren't a good help. This article shows an example of how to manually perform defragmentation on an index using SQL Management Studio. The fill factor determines the amount of empty space on each page in the index, to accommodate future expansion. SQL - defragmenting an index on a compressed table. DBREINDEX = rebuild a copy of the index (es) from scratch. Msg 50000, Level 16, State 1, Procedure IndexOptimize, Line 1009 The documentation is available at. If an index contains less than 100 pages, I will perform no maintenance. SQL will order its data file, but that is still subject to the OS's allocation of physical space for that file. You can use Ola's Index maintenance solution or Michelle Ufford's - Index Defrag Script. Example: Name: Indexrebuild_job; Description: RDS for SQL server agent job for index rebuild. Let’s use DBCC SHRINKDATABASE to reclaim the empty space. Now in order to defragment the data file we need to take the database OFFLINE and then run contig and then bring the database back ONLINE. Heavily fragmented Indexes - SQL Server 2005. In addition, SQL Server offers several different ways to perform index defragmentation. In this type of index, a pointer to the actual table data is stored in the leaf node. The defragmentation schedule must be created manually in all versions. name AS [IndexName] ,IPS. Paul pointed out a couple of other points. We need to identify all the indexes that are fragmented and defrag them to achieve better performance. e check fragmentation and take an appropriate action. 11:33. I'd consider doing a LOB_COMPACTION less frequently but both options comes down to your maintenance windows duration pretty much. OBJECT_ID) + '] REORGANIZE ; ' ELSE 'ALTER INDEX [' + ind. dm_db_index_physical_stats(DB_ID(N'XXXMYDATABASEXXX'),. avg_fragmentation_in_percent > 5 AND indexstats. Two types of fragmentation can afflict SQL Server indexes and consequently the performance of your databases. 2. Yup. Over time, the indexes created for an SQL Server database can become fragmented. These commands are great, but you really need to collect the information and then. Index fragments occur when any transaction takes place in database table. This is quite a big problem in SQL Server, as your indexes will fragment over time. SQL - defragmenting an index on a compressed table. On the second pass, SQL Server swaps the next physical page (7) with the next logical page (2). The scripts has some cool features like. Using SQL Server Managed Lock Priority for Online Index Rebuilds. Try this code, This will defragment your all indexes based on the fragmentation level. INDEXDEFRAG = defragments page by page. Share This: As the data in the database tables of Microsoft SQL Server changes, their indexes change. Greater than 30% – rebuilding the index with the REBUILD option is probably the best option. When using EXECUTES to rebuild and exclude indexes from the defrag SP, I receive the following errors: Msg 50000, Level 16, State 1, Procedure IndexOptimize, Line 918 The value for the parameter @Indexes is not supported. 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): For more instructions see the official docs. Within sql not only is there file fragmentation, but also fragmentation on the underlying objects, tables and indexes. This internal fragmentation occurs when inside the. As of version 2020. The tempdb is used a lot – place it on separate drive to the Log and MDF files. If you are experiencing slow full-text query performance, you can use sys. @dbScope specifies a database name to defrag. Next Steps This is a simple base script that could be modified into a stored procedure and also allow you to pass other parameters such as. You can verify that by doing an "edit" on the page and. How Defragmentation Improves Performance. Customize triggers to start and stop defragmentation. ) Then rerun the above free-space query again to see how the shrink worked: Free space after. Fragmentation typically happens owing to insert, update and delete transactions. It creates a thread that runs periodically to detect when the database has more than 25% free disk space allocated to it. All the Clustered indexes were fixed. Yes, this means you implementing things such as the built in index maintenance tasks in SQL Server 2014+, Adaptive Index Defrag, and Ola’s Maintenance Scripts are pretty much worthless at best and downright disastrous at worst. The DB restore may de-fragment (physically) at the disk level, but there will still be the same internal fragmentation at the page level. It is very common to see big increase in performance after optimizing your SQL indexes. The "index optimize" job created by Ola's install script focuses on defragmentation, not statistics update. I would run it every night, personally, as a general rule. 0 supports the SQL statements and syntax described in this chapter. fragmentation is the index value, described in percentages, which can easily be fetched by the SQL Server DMV. Both are deprecated in favour of ALTER INDEX where. These commands are great, but you really need to collect the information and then analyze the data to. NAME + '] ON [' + Object_name(ind. After inserting 2000 rows the fragmentation is at around 4%. It will do: Nothing if the fragmentation level is below 5%;. Auto shrink is a database option that is used to conserve disk space. Analysing the results of both the DBCC DBReIndex and the Alter Index Rebuild the percentage of fragmentation after the command was run is the same but there is a big difference in the amount of time to complete the operation, nearly 1/3. We have several databases in which a large number of tables are created and dropped. Artemakis Artemiou. For example, you can use ApexSQL Defrag to review the index usage statistics and apply the suitable. I figured, the reason was because of the page_count, which was lower than 1000 for each of the indexes that were still very fragmented. Identify and remove index fragmentation – this is obviously what we have been talking until now and the biggest part of the SQL index maintenance. Between 10% and 30% – defragging the index with the REORGANIZE option is recommended. This job needs to be scheduled and ran on a weekly basis due to. Microsoft best practice says that you should generally not do a rebuild operation unless fragmentation is over 30%. You also can create a linked server to SQLAZURE and create a sql agent job. Maintaining indexes is an ongoing and very responsible job assignment. go. g. One other item. The following example defragments all partitions of the PK_Product_ProductID index in the Production. Perform logical consistency checks on indexes. ApexSQL Defrag tool is a 3 rd party SQL index defragmentation tool that you can easily use to perform number of operations related to the SQL Server indexes. Alter Index Rebuild – 217454 ms (218 secs or just under 4 minutes to complete). At first glance, that would seem to indicate that your database got worse off if you defragmented! But like all good novels (and most bad ones), the plot thickens. SQL DEFRAG MANAGER. 1. That article was where the old "Best Method" recommendation of Reorg between 5 and 30% and Rebuild at > 30% fragmentation used to live. I teach the MS 2073 class quite a bit and the course material just. [name] as 'Index', indexstats. You should always do some form of intelligent rebuilding - i. Creating a SQL Server Maintenance Plan. In older versions of SQL Sentry, this feature is disabled by default. Aaron Bertrand April 13th, 2009 SQL Server 3. alloc_unit_type_desc FROM sys. The best recommendation I have is to create your own procedure which loops through the tables of the database and runs DBCC INDEXDEFRAG. 16. When you dig down through my computer to the properties for the drives, and hit the "defragment" button on. Your best assistant here is our SQL Defrag feature, seamlessly integrated with dbForge Studio for SQL Server . Receive email notifications for policy and. But over a period of time, because of DML operations (inserts/deletes/updates), the data will get spread across the disc (Physical order of pages are NOT in sequence). Right-click on the index and select Rebuild. Any indexes above 50% in fragmentation percentages that affect more than 4000 rows are bad, and the system performance can significantly benefit from defragmenting the indexes. index_type_desc ,IPS. Next Steps This is a simple base script that could be modified into a stored procedure and also allow you to pass other parameters such as doing an index. @tblName specifies if you only want to defrag indexes for a. To reorganize index SQL Server, right-click it & choose Reorganize. Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW) Columnstore indexes are the standard for storing and querying large data warehousing fact tables. However, over time, indexes will get fragmented, which can severely impact server performance. It is designed. It’s like a looking at the results of a developer writing SQL after three Red Bulls – it doesn’t make any sense, and you just want to wad it up and throw it away. It shouldn't be used on WSUS 2. index : will run only index. It automates the time-consuming process of finding fragmented indexes based on policies for the targeted databases. avg_fragmentation_in_percent <= 30 THEN 'ALTER INDEX [' + ind. Watch on. 7, on any database context you choose to create the usp_AdaptiveIndexDefrag and its supporting objects, open the attached script, and. 3. Burt King. Here are some steps you can follow to free up some space in a hurry. This. Index fragmentation at a filesystem level really only hurts two things, the first of those is read-ahead which. Chad Boyd. physical defragmentation by orders of magnitude. With ApexSQL Defrag tool the SQL index fragmentation of SQL Server instance can be easily monitored by DBA’s. SQL Server 2005 Index Fragmentation. Hello Marcos, I can't confirm this. This is called fragmentation. Defragmentation in Practice. The datafile. Daily – 6% fragmented. Index Defragmentation is one of the key processes to significantly improve performance of any database. SQL Sentry Fragmentation Manager helps you make intelligent decisions about index management based on the table and index information collected. The database will be shrunk leaving it. This can be checked using:. A new window. Demo on impact of fragmentation while using non-clustered index on GUID primary key. 0. MyTable. Create a execute sql task and schedule it through sql agent . as our primary concentration is to defrag indexes. Try one of the queries below and see if that is what you are looking for: SELECT OBJECT_NAME(OBJECT_ID) AS DatabaseName, last_system_update,* FROM sys. SQL Defrag Manager is described as 'Find and Fix SQL Fragmentation' and is a Defrag tool in the development category. Q1: None. The method (not a trick), therefore, is to Create Clustered Index only for the purpose of de-fragmenting the Heap, and drop it afterward. 2. A starting point could be looking at the queries being executed on your server. SP_BlitzCache can help with finding your worst performing queries. Columnstore Online Index Rebuilds – Columnstore indexes need more attention to maintenance. Refer to the below links:The downside to using the Reorganize Index task is that its index defragmentation capability is not as thorough and complete as the Rebuild Index task. Defragment on-demand and via schedules. If an index is between 10% and 30% fragmented, I will REORGANIZE the index and UPDATE the statistics. It shrinks the size of a database file, either to a specific size or as small as it can. Greater than 30% – rebuilding the index with the REBUILD option is probably the best option. Watch this video by @A_Bansal to understand index fragmentation & page splits. Some things I've tried: Rebuilding the indexes: ALTER INDEX ALL ON dbo. One of the biggest performance hits that you will see on your databases, next to not having indexes, is indexes that are very fragmented. 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. Check the comment header block for its documentation. It makes your indexes larger and many operations slower by making the SQL Server access more pages than necessary. To create SQL Server agent that will defragment specified indexes automatically, perform the following steps: Expand SQL Server Agent in Object explorer, right click on Jobs, and select New Job…: In General tab, specify the name and description for the job. Note: In versions 2020. OBJECT_ID) AS TableName, fq. In Object Explorer, Expand the database that contains the table on which you want to reorganize an index. The execute sql task should contain the index rebuild code along with stats rebuild . This may affect the concurrency of the server that's running SQL Server. Miscellaneous tasks such as enabling trace flags or removing a DLL. This should be part of our SQL Server Maintenance jobs. In this blog post, I’m going to discuss index fragmentation, several ways you can identify it, and why a more granular approach. It’s advisable to remove those often. 2. 25. Not so much if the file is spread out all over the disk. You always has some "white noise", so to speak. To create a new maintenance plan, right click on Maintenance Plan and select New Maintenance Plan and the following window will open. SQL Server index fragmentation is unavoidable, but you can minimize the negative effects of fragmentation on database performance. Automate defragmentation policies to multiple databases, tables, and indexes. Like SQL Server Management Studio, you run Tuning Advisor from a client computer that connects to your Amazon. Basically, an index rebuild copies the index to another place. You have the options in the Plan for shrinking the database and defragging existing indexes. [object_id] AND [ips]. Missed Connection: Employer Seeking Employee. Double Click on one of the SQL Statements. Its wide range of features allows users to create and manage custom policies, monitor index fragmentation on multiple servers as well as to create index fragmentation reports. [SQLSTATE 01000] DBCC: Defrag phase of index. Niko Neugebaeur is the go-to for in-depth columnstore tips, and in this post, he analyzes the online. [object_id]) as [TableName] ,SI. Copy the detached database file back to the. You can also change this threshold via parameters. Lock durations are short and will cause minimal blocking of queries. Trigger defragmentation of database indexes by fragmentation percentage and scan density. Yes, rebuilding indexes will take a toll on your transaction log file. At first glance, that would seem to indicate that your database got worse off if you defragmented! But like all good novels (and most bad ones), the plot thickens. If you have fragmentation, you need to REBUILD or REORGANIZE. Index names must follow the rules of identifiers. We have a database with 2 tables, one with hundreds of millions of rows (row size<1KB), another 14 million rows. Two additional methods to defragment physical database and log files are backup/restore or detach-move-attach, and both require down-time. You need free space in the db of table_size x 1. (You could even go with 0% if you want. If. Automate the identification of index fragmentation hot spots. Odds are, you’re not actually making things better – you’re making them worse! I explain why in this video: Why Index Fragmentation Doesn't Matter in SQL Server. Location : HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows Search. Before SQL Server 2005 (9. Lines 436-443 setup the dynamic SQL to rebuild the index with the specified fill factor if the table is not partitioned. Maintenance tasks on a database, index, or filegroup. 1 Answer. Azure SQL Database is a PaaS solution for migrating your on-premises databases to the Azure cloud infrastructure. However, each records will be updated at least 3 times afterwards. When you create a clustered index, it reorders the rows of a table in addition to creating the CIX (a table with no CIX is a heap). The results for this command are up for comparison against the Alter Index Rebuild. According to Microsoft guidelines, based upon index fragmentation percentage, we may choose to either REORGANIZE, REBUILD indexes or just ignore. Paul’s answer to the question was very practical and dealt with the wasted space utilization that excessive index fragmentation can cause in a database that uses a uniqueidentifier column with newid () as the primary key, and given the cost per gigabyte for SSD storage this could be quite significant. If it grows often, it could concievably become fragmented. In SQL 2005, you can query DMV sys. Only indexes with > 10,000 pages will be touched. If you have a clustered index on the table the fastest way to defragmanet your table would be to drop and recreate the clustered index. Because the smallest unit of data to be cached is an 8 kB data page, not a single row, it also. I’m talking about the guidance which is: if an index has less than 1000 pages and is in memory, don’t bother removing fragmentation. 1. SQL Server Agent job alert configuration. For more details, we could refer to the following articles:I think you need index_id in the joins against sys. In this article, I will provide a mechanism for automating SQL Server index defragmentation implemented in a database used in the company I work for. Contig can defragment SQL Server database and log files while the databases are online, but there is some performance cost (whether or not the. Based on the. The wise use of indexes is a proven method of improving database performance. Friday, August 26, 2016 2:15 PM. This database has a few hundred tables and each table has a range of 1 to 15 indexes per table. Heaptest default values go 50 select index_type_desc,avg_fragmentation. {"payload":{"allShortcutsEnabled":false,"fileTree":{"AdaptiveIndexDefrag":{"items":[{"name":"CHANGELOG. Fortunately, like Windows 7, Server 2008 can on a schedule defrag. Thus it is not advised to run index rebuild during operational hours only during maintenance windows. Check the comment header block for its documentation. Manually shrinking or growing files using T-SQL commands can also contribute to physical file fragmentation. Click OK. Index names must be unique within a table or view but don't have to be unique within a database. 8. There are two types of fragmentation: Internal Fragmentation and External Fragmentation. This means every time we need to scan the index, it’ll take 10%. Defragment indexes on your SQL SCCM database every night. Sorted by: 2. 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. Each option had its pros and cons, and you need to know which option works best for your environment. The method (not a trick), therefore, is to Create Clustered Index only for the purpose of de-fragmenting the Heap, and drop it afterward. 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): For more instructions see the official docs. Use the ALTER TABLE command to rebuild the Heap. Watch on. These pages can get empty space on them and become out of order over time as well. NAME + '] ON [' + Object_name(ind. Watch this video by @A_Bansal to understand index fragmentation & page splits. Indexes were 75% fragmented. Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance SQL Server, Azure SQL Database, and Azure SQL Managed Instance support table and index partitioning. The data of partitioned tables and indexes is divided into units that may be spread across more than one filegroup in a database or stored in a. Defaults to 480m (8h). SQL Index Fragmentation and Maintenance. a. DBCC SHRINKDATABASE(WorldOfHurt, 1); And it’ll reorganize the pages in the WorldOfHurt to leave just 1% free space. On the third pass, SQL Server swaps the next physical page (4) with the next logical page (3). Fragmentation. If you have space constraint on the Server then you may need to Shrink the db. Let’s say N […] How Fragmentation Hurts SQL Server Performance. It was noticed that the data has high fragmentation. Delete the database with fragmented MDF file. Then you can do an alter index with the rebuild clause whenever your threshold is reached. I've been tasked with performing defragmentation on all of the tables. This clause is equivalent to DBCC INDEXDEFRAG. If you want to defragment a heap in SQL Server 2005, you have three options: 1) create a clustered index on the heap, then drop the clustered index;Many of my clients to defrag their hard drives; some however do not. Paul Randal. Reorganizing the indexes: ALTER INDEX ALL ON dbo. Right-click on the fragmented index and select Rebuild or Reorganize option in the context menu (depending on the desired action): Click the OK button and wait for the process to complete. Auto shrink is a database option that is used to conserve disk space. Index fragmentation can cause high CPU usage, which means disk usage, and therefore performance degradation. This will block all queries to that table using the index till the index defrag is finished. So if I understand, with the fragmented indexes, SQL Server must go all around the Disk to find the pages it needs. ALTER INDEX ALL ON Production. Monthly – 17% fragmented. Sc (Comp Sci) SQL In The Wild : Discussions on DB performance with occasional diversions into recoverability We walk in the dark places no others. HeapTest ( Id INT not NULL Default (1), Col1 char (5000) Not null Default ('Heaps Are Cool') ) SET NOCOUNT ON Insert into dbo. To rebuild or reorganize indexes manually, head over to the Fragmentation tab. Let it autogrow with at least 200 MB at the time. txt","path":"AdaptiveIndexDefrag/CHANGELOG. This had a negligible impact. Right click the index, click Properties, then click Fragmentation to see the fragmentation and page fullness percentages. Rob Sheldon tackles the subject of Index Defragmentation in SQL Server 2005 and 2008, using the sys. You can use sys. DBCC INDEXDEFRAG can defragment clustered and nonclustered indexes on tables and views. The Ultimate Index Width Stats Reporter. 0). One solution is to deploy a faster I/O subsystem, where page splits would be less of an issue. All they do is waste space and resources. As data is added to the table, the free space fills because the fill factor isn't maintained. If your table has a clustered index, the state of the index reflects the state of the table. I have SQL Server Agent (2005) jobs that periodically perform CHECKDB and a defrag (ALTER INDEX REORGANIZE/REBUILD) of any index that is highly fragmented. is_ms_shipped = 0 --Excludes any objects created as a part of SQL Server installation AND ss. If you’re a production database administrator responsible for backups, corruption checking, and index maintenance on SQL Server, try Ola Hallengren’s free database maintenance scripts. It's. Speaking for SQL Server, I tend to choose a index size and index fragmentation level at which point I begin performing index maintenance. Fairly easily, you can use my sp_RebuildIndexes procedures as a base and then change the code to DEFRAG instead of rebuild. [avg_fragmentation_in_percent] FROM sys. Often, this is not enough to perform index. Fragmentation >=30 AND PAGES>1000 then. Defragmenting an Index. DBCC IndexDefrag – 1015984 ms (1,016 secs or just under 17 minutes to complete) 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. Apart from disk space you should not be too worried. ALTER DATABASE [Inter3112] SET OFFLINE GO. Here I use 4 conditions : 1. Everything worked fine. Run sys. Sql server 2005 needs daily index defrag. Missed Connection: Employer Seeking Employee. SQL index fragmentation reports. Veritas now uses the heavily debated command DBCC SHOWCONTIG WITH ALL_INDEXES,or DBCC SHOWCONTIG WITH ALL_INDEXES,tableresults (Table results will give you a table format to read) to. If the data isn't ordered inside the data (SQL) pages / extent, then that will result in more reads from the SQL Server side and SSD side of the equation. You can't do online index rebuilds. 31 and later, this feature is enabled by default for all targets. Use DBCC INDEXDEFRAG to defragment an index. I have a mssql database, we'll call it: mssqlDB01. Here are the options that I came up with: Expand the 1st file in the PRIMARY filegroup by ~28GB (7 files x 4GB) Move the data off each of the successive files and mark them for deletion. Store the data in a temporary table, truncate the old data, and re-insert the data back. For those unfamiliar with this object, it defragments indexes in SQL Server 2005 using the ALTER INDEX command. Note that PostgreSQL uses the term "clustered index" to use something vaguely similar and yet very different to SQL Server. Sorted by: 1. I have a weekly process that does all of my database checks, etc. Index still fragmented right after rebuilding it (SQL Server) 1. A proper query analysis plan has to be built and followed. INDEX DEFRAG on SQL SERVER 2005. Index Recommendations and ORDER BY’s. The name of the index. 8. dm_db_index_physical_stats(DB_ID(), default, default, default, 'SAMPLED') AS. That can be found using the STATS_DATE function. For more information, see ALTER DATABASE (Transact-SQL).