query about sql server table query???

Question

i have a query

 

"select * from tablename"

 

thats taken execution time 10 second first time

but when i execute again then take 2 second

whats the reason ????

Answer 1

thank u very help full ths article

Answer 2

This article provide the explanation to it. https://littlekendra.com/2016/11/25/why-is-my-query-faster-the-second-time-it-runs-dear-sql-dba-episode-23/