mysql - COUNT() comments each time vs cache in count_comments column vs use another type of cache -


i have common doubt.

guess creating social network or blog posts, , each post has comments.

if want paginate , filter lists of posts , show amount of comments of each post

should add count_comments column posts table (like wp does) , cache amount of comments there (i.e. every time comments add 1 if deletes comment sub 1 count_comments column)

should perform subselect count amount of comments every time , cache result form or caching

or recommend?

in short words: both work, , both variants have advantages , disadvantages.

you'll have arguments both ways.

if need comment count frequently, , takes alot of system/application ressources value simple sql statement (p.e. sorting value pain), storing value in field wordpress way it.

if don't need comment count frequently, and/or doesn't take alot of ressources values (select count(*) yourcommenttable yourpostid = whatever shouldn't tough systems), possibly benefit more while avoiding issues keeping value in sync actual comments in posts.


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