Beefy Boxes and Bandwidth Generously Provided by pair Networks
Pathologically Eclectic Rubbish Lister

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??

update: See last lines

I tried to repeat this performance by making an SQLite database of those two tables + indexes, together 600 MB, employees with 18M rows, groups with just 3 rows.

"select * from employees where sam_account_name = '<some unique value>'" takes 3 seconds. Your query takes even longer.

So, it seems your results are normal. SQLite is not a particularly fast database. (Then again, I know next to nothing of SQLite; it's always slow-ish in my hands so maybe I do something wrong.)

FWIW, postgres runs this same query in less than a millisecond, with the same data.

Could sqllitestudio be caching the query, or the data? It seems likely; sqllitestudio is just a wrapper, from what I read on its website.

How fast is a SQLite commandline query? Maybe you can try something like:

time sqlite3 ~/employee.db "select e.* from employees e, groups g where e.sam_account_name = g.sam_account_name and g.group_name = 'whatever' order by e.last_name, e.first_name"

(Sorry, I don't know the windows invocation.)

update: Mea culpa: I botched the indexing (didn't commit..), and with the indexes fixed it worked all right: fast, and just as fast as postgres. So I take all the above back.

update 2: now ran it on windows 7 too and it was PDQ there as well.

In reply to Re: DBD::Sqlite queries slow - and gives wrong results by erix
in thread DBD::Sqlite queries slow - and gives wrong results by astroboy

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?

    What's my password?
    Create A New User
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others pondering the Monastery: (3)
    As of 2021-04-10 20:09 GMT
    Find Nodes?
      Voting Booth?

      No recent polls found