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SQL SERVER CLIENT STATISTICS HOW TO
SQL SERVER CLIENT STATISTICS UPDATE
SQL SERVER CLIENT STATISTICS FREE

SQL SERVER CLIENT STATISTICS UPDATE

You could also let auto update stats take care of the issue– that’s often just fine on small databases or where there aren’t major data fluctuationsĪnd each of those options should chew up less IO than updating all index and column statistics with FULLSCAN.The example I’ve linked to is super clever, and avoids updating statistics where it has just rebuilt an index!

SQL SERVER CLIENT STATISTICS FREE

You could use a free index and statistics maintenance script.

You could use a t-sql related task or a custom SQL Agent job to run sp_updatestats.

You’ve still got good options, they’re just a few more steps: There’s no way to just use the basic “You compute the minimum sample” with that task. Unfortunately, if you use maintenance plans there’s no super simple solution– it forces you to specify either fullscan or a specific sample. The basic “UPDATE STATISTICS Schema.TableName” command is pretty clever– the issue is simply that Maintenance Plans don’t make it easy for you to run that! It’s rare to truly need to use FULLSCAN to update stats in SQL Server, and even when cases where it’s justified you want to implement that with statements targeting the individual statistics to update.

SQL SERVER CLIENT STATISTICS HOW TO

It dynamically figures out a sample size by which to calculate results! (It can pick a variety of options– including scanning the whole thing.) How to configure faster, better statistics maintenanceĪvoid falling for the pre-populated settings in the “Update Statistics” task in the maintenance plan.

To create some column level stats, I run these queries: It already has indexes and their associated stats. (I love this feature, by the way!) We will use one of these commands to test things out in a bit.įirst, let’s make sure we have some column level statistics on our database. In our maintenance plan task, if we hit “View TSQL”, a window pops up showing us the comamnds that the plan will run. But we can take a closer look and see for ourselves. If SQL Server needs to update column level statistics for the same table, it could potentially use a single scan and update multiple stats, right?īecause of the runtimes I was seeing, I was pretty sure that wasn’t happening. Why ‘SELECT StatMan’ repeatedly scans tables “Fullscan” means that to update a statistic, SQL Server will scan 100% of the values in the index or column. There may be quite a lot of statistics - most people leave the “auto create statistics” option enabled on their databases, which means that queries will dynamically cause the creation of more and more statistics over time.Ĭombined with “fullscan”, updating all statistics can become a significant amount of work.

“All” statistics means that both “column” and “index” statistics will be updated. In the case I was looking at, the Update Statistics task was being used with two values that are set by default: I love the concept of maintenance plans, but I don’t love the way all the tasks are set up. Why would updating statistics take so much longer? Maintenance Plans light the fuse Indexes are larger and contain more data. What was going on? Statistics in SQL Server are small, lightweight objects. Update statistics – this took 2-3 hours each night.Rebuild all the indexes in the database – this took 10 minutes each night.I first knew something was up when I looked at the job history for a simple maintenance plan.