Does SQL Server CACHES Query Results? -


this question has answer here:

when run query sql server caches results?

because: when run below query:

select id foo foo.name '%bar%'

the query runs 40 seconds on 1st time.

but on second run takes only few seconds.

is because execution plan somehow cached or data cached can retrieve faster on 2nd run?

sql server not cache query results, caches data pages reads in memory. data these pages used produce query result.

you can see if data read memory or disk setting 

set statistics io on

which returns following information on execution of query

table 'productcosthistory'. scan count 1, logical reads 5, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.

the difference between logical , physical reads data read memory.

sql server claim memory caching until maximum (configured, or physical maximum) reached , oldest pages flushed.


Comments

Post a Comment

Popular posts from this blog

asp.net mvc 3 - Using mvc3, I need to add a username/password to the sql connection string at runtime -

i see how build string using stringbuilders (sql/entity framework); do cause connection string used in dbcontext? example context: public class pophistorydbcontext : dbcontext { public dbset<pophistory> histories {get;set} } public class pophistoryrepository: ihistoryrepository { private pophistorydbcontext context = new pophistorydbcontext(); public iqueryable<pophistory> histories{ {return context.histories;} } } example usage in controller: public class historycontroller : controller { private ihistoryrepository repository = new pophistoryrepository(); var histories = h in repository.histories (h.modifytimestamp > today) select h; if (!string.isnullorempty(searchstring)) { histories = histories.where(h => h.dn.toupper().contains(searchstring.toupper())); } thank you
Read more

kineticjs - draw multiple lines and delete individual line -

i can draw multiple lines on canvas; added layer using drawscene dlayera1.add(line); line.getpoints()[0].x = mousepos.x; line.getpoints()[0].y = mousepos.y; line.getpoints()[1].x = mousepos.x; line.getpoints()[1].y = mousepos.y; moving = true; dlayera1.drawscene(); http://jsfiddle.net/user373721/xzead/1/ . is there way delete individual line? currently, you'll have modify points array this: line.getpoints()[0].splice(index, 1); since arrays modified reference, modifying returned array modifies "source of truth" points array attr
Read more

thumbnails - jQuery image rotate on hover -

any chance change image src on hover , count 10 , again first? this need, default thumb, flv-3.jpg ! <img src="/thumbs/e/b/d/6/d/ebd6d2d6d99e/ebd6d2d6d99e.flv-3.jpg" /> on mouse hover need change number flv-1.jpg flv-2.jpg flv-3.jpg flv-4.jpg etc.. up 10, , again , start number 1, when move mouse thumbs need default thumb flv-3.jpg this im use not solutions, var _thumbs = new array(); function changethumb(index, i, num_thumbs, path) { if (_thumbs[index]) { document.getelementbyid(index).src = path + + ".jpg"; preload = new image(); preload_image_id = (i + 1 > num_thumbs) ? 1 : + 1; preload.src = path + preload_image_id + ".jpg"; = % num_thumbs; i++; settimeout("changethumb('" + index + "'," + + ", " + num_thumbs + ", '" + path + "')", 800) } } function startthumbchange(index, nu
Read more