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These stats update occurred to the queries customer pointed out.
Below is an example of auto update in profiler trace extracted from customer’s data collection.
Updates query optimization statistics on a table or indexed view.
By default, the query optimizer already updates statistics as necessary to improve the query plan; in some cases you can improve query performance by using UPDATE STATISTICS or the stored procedure sp_updatestats to update statistics more frequently than the default updates.
This tip will give an introduction to this exciting new feature.
However, updating statistics causes queries to recompile.Because of this importance, these statistics should be up to date in order to get the best performance when executing a query.The mechanism that automatically updates the statistics in SQL Server depends on the number of rows that are modified in a table which exceeds a specific threshold.This includes statistics created using the CREATE STATISTICS statement, single-column statistics created when AUTO_CREATE_STATISTICS is on, and statistics created for indexes.For more information about AUTO_CREATE_STATISTICS, see can be from 0 to the total number of rows.