data-konzept

'With SQL 2005 end of life, many customers are planning their upgrades to SQL 2014. One of the recommended post upgrade tasks is updating the statistics of all the tables and databases in latest compatibility level. The updated statistics ensures the query optimizer in the latest release has most up to date data to produce the best plans. For VLDB scenarios, running update statistics on the entire database can take considerable time to complete depending on the volume of data. As applications are required to run 24/7 with desired performance, DBAs are increasingly under pressure to keep the maintenance window as low as possible. One such improvement introduced in SQL 2014 SP1 CU6  targeted towards optimizing and reducing execution times for UPDATE STATISTICS runs is detailed in this blog post.

In scenarios where the execution time of update statistics job is critical, the execution time can be improved by running update statistics for tables in the database in parallel.'...

https://blogs.msdn.microsoft.com/sql_server_team/boosting-update-statistics-performance-with-sql-2014-sp1cu6/