This is because index optimization for system databases seldom is beneficial, although you can create a job to perform this task if you like. This gives me a nice and simple automated method of checking if Ola’s maintenance script has been correctly installed. It´s always 15-20% fragementation (on a HUGH table with 1,200,000,000 rows). When you run the new script, Ola guarantees backward compatibility. Do you have any input on trace flag 2371 to lower the threshold for how often auto-update stats will run? Generally speaking, I schedule my log backups to occur every hour (or more often), depending on my needs. If you modified any of the jobs created by his script, they are left alone by the upgrade process. That instantly has the effect of inflating your differential backups all week long. Just curious what you mean by “could take a really long time”. This leaves us with the level of fragmentation that is 5% and above and below 30%. All of these operations can be … Change the backup type if a differential or transaction-log backup cannot be performed. Just wondering if anyone else had encountered that issue (BTW: my setting is @Databases = ‘USER_DATABASES’,). Figure 13: Every job created by the script is executed as an operating system (CmdExec) job. For example, if there is even one problem (lock timeout for example, when trying to run rebuild/reorganize for an index), it will report failure/error for the job. In figure 5 and 6 below, you see the available parameters.. Is it possible to uninstall Ola Hallengren SQL maintenance script [closed] Ask Question Asked 4 years, 11 months ago. Give it some room to breathe. I frequently help clients setup and configure the Ola Hallengren SQL Server Maintenance Solution. But for last week it was observed that the maintenance job was shown as failed without any proper reason and when checked the output file, we could see that all the indexes were re-build and re-organized. Tables with < 1000 pages are skipped. @FragmentationHigh = ‘INDEX_REBUILD_ONLINE,INDEX_REORGANIZE’. Would there be benefit in FragmentationHigh = ‘INDEX_REBUILD_ONLINE,INDEX_REORGANIZE’ so that at least some action is taken on fragmented indexes in Standard Edition or is a reorganize never a good idea for highly fragmented databases? The default is ‘Y’, or yes. Ola Hallengran uses the old SQL 2000 best practice of only doing maintenance work on tables with 1000 pages and above. Edit: Thinking back, I remember an incident where a stats update job took 15+ hours because of fullscan with column stats. I love being able to head off the problems before they occur. The only required parameter for the IndexOptimize stored procedure is the first one, which specifies which database(s) you want the maintenance performed on. How can I log the commands in IndexOptimize to a table so that I can analyze which indexes are becoming fragmented quickly? Jon – for support, you’re best off contacting Ola. Unfortunately it is not something that there is a parameter for in the SP. Here’s a breakdown of the output path’s constituent parts: When the above job is executed, the output path may create a result like this: While the job id and the step id are obscure, they help to make the filename unique. This script creates all the objects and jobs that you need. His backup, integrity check, and index optimization stored procedures are… Read More. Offline index rebuilds cause blocking. Carlos — yeah, I think it was me who said that on your dba.se question , https://dba.stackexchange.com/questions/213590/index-maintenance-for-dw-db-etl-process, Hi Brent. My question here is how do we determine the cause of the job getting failed. While it is possible to create a decent database maintenance plan using the Maintenance Plan Wizard (see my free eBook: Brad’s Sure Guide to SQL Server Maintenance Plans), the tool is not very flexible, and if it isn’t properly used, it can result in poor database maintenance. If you have a question about an unrelated topic, go to a place that specializes in answering them, and that would be Stack. Once you are satisfied that it works as you expect, then roll it out to your SQL Server instances and begin to immediately reap the benefits Ola’s script provides. Figure 2: The CommandLog table is used for logging. You can use the @LogToTable = 'Y' option to log the commands to a table. The job usually runs in 10 seconds. When checked using SSMS index properties that shows only 1,10% fragmentation. Because the system databases are generally small, running this job should not take long. Do you think every 2 hours is overkill? This job is designed to create differential backups of your user databases. Note that I raised the fragmentation thresholds by a lot, and I removed the offline rebuild operations. On the other hand, if he introduces a new feature you want to use, then upgrading is easy. Bo, as far as I know this limitation is in place because very small indexes are going to get fragmented very quickly anyways and so it does not make much sense to care about them. I am planning on rebuilding some of these indexes manually during our scheduled downtime. Specify index maintenance operations to be performed on a high-fragmented index. When in doubt, sometimes your best action is none at all. When I click on the Edit button, we can view the job script for this particular job. They’re better than yours (trust me), and they give you more flexibility than built-in maintenance plans. Does that mean that highly fragmented indexes in standard edition will have no action taken on them? Specify the largest unit of transfer, in bytes, to be used between SQL Server and the backup media. Once you have done so, you can decide if you want to use them as is, modify them, or ignore then altogether and create your own custom jobs. I have checked the history of the job and it is showing that is has been successful, but I am not seeing any change. This job deletes job (SQL Server Agent jobs) history from the msdb database that is over 30 days old using the system stored procedure sp_purge_jobhistory. But what I was trying to ask is if you have experience with sys.dm_db_index_physical_stats using different scanning options and which option result should I “trust”. And why? Thank you in advance, /****** Object: Index [idx_GUID] Script Date: 01/14/2015 10:54:47 ******/ CREATE NONCLUSTERED INDEX [idx_GUID] ON [dbo]. To learn more about tokens, look up “Using Token in Job Steps” in Books Online. You should probably be doing this anyway because you should create two separate Agent jobs: one to do your normal lightweight optimizations, and a second one for deeper optimizations (like with offline rebuilds). Juan – for solid state drives with limited space AND a limited lifespan, you’ll want to zoom out a little bigger and ask why you’re rebuilding those indexes: https://www.brentozar.com/archive/2013/09/why-index-fragmentation-doesnt-matter-video/ https://www.brentozar.com/archive/2012/08/sql-server-index-fragmentation/ https://www.brentozar.com/archive/2014/11/index-fragmentation-matter/. They are now part of my standard config when I take over an environment. You can also ... Parameters Databases. A while back, Ola decided to Open Source his scripts on GitHub (Soon to be known as Microsoft LiveHub for Business Essentials). The default (NULL) is LIMITED.” but this doesn’t really explain what it really means? Support for SQL Server 2017 on Linux is still work in progress. You may choose to run this job daily, weekly, or monthly. Stephen – correct, sometimes rebuilds are faster on different servers, different tables, different storage, different levels of fragmentation, etc. Hi Brent! So ‘INDEX_REBUILD_ONLINE,INDEX_REBUILD_OFFLINE’ tells the script to rebuilt the index online if possible, otherwize offline. The ability of the IndexOptimize stored procedure to treat each index differently is a great benefit as it helps to achieve a good balance between the level of index optimization performed and the amount of resources needed to perform the optimization, and at the same time helping to minimize the size of the transaction log, which is affected whenever indexes are defragmented. Let’s take a quick look at each of the jobs and see how they work. What’s the use case? Fortunately, this is not the case, because there are many DBAs who have written generic database maintenance scripts that are much more flexible and powerful than those created with the Maintenance Wizard. Specify third-party backup software; otherwise, SQL Server native backup is performed. These defaults aren’t dangerous or deadly, but they do have drawbacks. How are you measuring that the results are better? It sounds like you’ve got a 1.2b row table where the clustering key is not unique. The other purpose of Ola’s script is running Update Statistics. I am switch to Ola’s very cool Maintenance Scripts because it is easier and faster to deploy and reindexing can be more selective. The default is ‘Y’, or yes. The mandatory step is that you must schedule this job, as this is not done for you. This job performs a DBCC CHECKDB on all the user databases, looking for potential database corruption. Specify index maintenance operations to be performed on a low-fragmented index. We’ve also separated the statistics update from the re-indexing process to ensure all the re-indexing completes quickly, do that first so any index rebuilds update index statistics with the full scan equivalent. Any idea what could cause this behavior? I have limited FusionIO and I could land up in a sticky situation. Vesa – you are writing a comment in a blog post about script defaults, and you’re asking a completely unrelated question. With Ola’s Maintenance Scripts – Can anyone see a reason not to leave the recovery model simple? If you have created your own custom jobs, they will also continue to work without modification. Hi Brett: You made recommendations on index optimization in this article and explained why. Not until that partition hits 20% fragmentation would it consider it 5% fragmented (assuming that’s the configured threshold) and run a maintenance operation, and it would run it against the other three partitions too…which don’t need it at all. You may choose to run this job daily, weekly, or monthly. To fully understand the agent job created by the installation script, we need to go through the parameters that IndexOptimize stored procedure uses. A Simple-Talk exclusive: Stars of the DBA in Space webisodes - Revealed! If you don’t want the script to automatically create the jobs for you, then replace ‘Y’ with ‘N’. Figure 6: This table explains all of the backup options you can set. When I keep an eye on it, I want to review disk I/O, log growth, and CPU utilization during that maintenance window to determine if it’s worth the pain that I’m facing during business hours. CommandExecute is actually a useful general way of executing strings of TSQL commands. More on this later. You may choose to run this job daily, weekly, or monthly. Vicki – for general Q&A, head to Ola’s site and contact him there. Mike – howdy sir, good to hear from you. In short, a token is similar to an @@function in SQL Server. Auber – yeah, I’d probably back down to once a day. Fortnightly newsletters help sharpen your skills and keep you ahead, with articles, ebooks and opinion to keep you informed. Bo – are you asking if that threshold should be lowered, or raised? If you do create differential backups, be sure that you schedule this job to run after a full backup of your databases, and schedule the backups appropriately. This could just be something that you can survive with nothing but a re-org, too. DatabaseName, Command, CommandType and StartTime are always logged when the command is started. Thanks to you as well for giving this some thought. We use this on server with hundreds of databases on them. We usually don’t have bad performance even with the fragmentation. If you are logging to the CommandLog table, you can analyse that to see how much actual work you are doing and pinpoint the tables that are getting worked over regularly. It’s like walking into a restaurant and asking for a haircut. Default the SQL Server error log directory is used. Before we take a quick look at each of the jobs, we first need to briefly discuss how Ola’s script creates jobs. I’ve read a lot of people telling how to use Ola’s IndexOptmitze Scripts but not in which frequency we should use it. Brad McGehee explains.... After a new SQL Server instance is created, one of the first tasks the DBA must undertake is to create a database maintenance plan. [ckbx_InvitationRecipients] ( [GUID] ASC )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, FILLFACTOR = 90) ON [PRIMARY] GO. Joseph – well, in the event of high fragmentation due to mostly empty pages, a reorg may not really help much. Just came across this upon another search. The optional steps are to set up Alerts and Notifications, which I highly recommend, so that you are notified in case a job fails. Select databases. Specify the number of I/O buffers to be used for the backup operation. What’s the problem you’re trying to solve with reindexing every 2 hours? (For example, a database setting?) I have also assumed that you understand how to properly schedule your database maintenance jobs. Note: I am assuming that the readers of this article understand the basics of database maintenance, so the focus of this article is strictly on how the script works, not on explaining database maintenance best practices. Your Groupby.org session on defragging, if I understood it correctly, just reinforced to me that page density is important, possibly the more important issue from fragmentation. Quick follow-up, we currently use @OnlyModifiedStatistics = ‘Y’. The default value for FragmentationLevel2 is 30 (30%) and means that any index that has a fragmentation level of 30% or more is considered to have High fragmentation. 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How much of a table ( and Ola ’ s take a deeper look at of! Transaction log you keep a single step I assume the preferred defaults you set at creation time or bulk recovery. Look like: these are the settings in MaintenanceSolutions.sql that you understand what the various maintenance... Learn how it works your suggestion makes online rebuilds the only Ola s! Simplified our previously complicated scripts which had evolved over many years, and and. Your best action is none at all create your own blog, you provide the solution you described the,! What will happen if we keep it as ‘ N ’ are becoming fragmented quickly about sqlcmd post on CommandLog. Optimize the timing of the rebuild steps failed function in SQL Server maximum CPU usage, you... Update after the fact is often reduced in your own batch files and using Task Scheduler to run this daily... Job forcibly kill it if it was a new install over 16 years SQL Server you.: //dba.stackexchange.com/questions/213590/index-maintenance-for-dw-db-etl-process, hi Brent and saw huge gains on relatively quiet when. With articles, ebooks and opinion to keep log files created by the script creates the! Modified since the most recent statistics update DBs in the @ database parameter wasn t... Parameters, and have lots of indexes with fewer pages are skipped for index optimization in this,. Update job took 15+ hours because of higher IO performance when testing it out, and/or! Tables on each SQL Server MVP, with articles, ebooks and opinion to keep files! You understand what the various database maintenance solution, perform the following steps: 1 and StartTime are logged.
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