Updating index statistics sql 2015 xxx hot moblie
This means as you add and update records in a database table the index statistics slowly get out of date, until SQL Server determines you have added and/or updated enough records and then it recreates the statistics.Therefore with large tables with millions or billions of records, SQL Server may require that a few hundred thousand or millions of records need to be added, updated, and/or deleted before the statistics are automatically updated.SQL Server uses this information to determine what kind of execution plan to use when processing a query.
The first method is to use SQL Server Management Studio.There are lots discussions and recommendations on the net around this topic among SQL Server community. Do you need to update statistics after rebuilding indexes?What is the difference between index rebuilding and re-organising? I’m pleased to share the findings of my extensive research into this very important topic of SQL Server database administration.With tables that contain millions of records, this means a lot of records need to be updated, inserted and/or deleted before SQL Server will update statistics automatically.The problem with out of date statistics The problem with having out of date statistics is that SQL Server might not know all the different possible values there might be for an indexed columns, and therefore the database engine will pick a sub-optimal execution plan.