1. How can I turn on the SQLite "Shared-Cache Mode" from DBI or DBD?

    Use a connect string of the form 'dbi:SQLite:dbname=file:memdb2?mode=memory&cache=shared'.

  2. Does it work as expected, if I fork off a thread, which opens SQLite shared memory? (Have anyone done this craziness with Perl before?)

    What are you expecting?

    (Kinda, but there are some issues. At least on windows.)

    For a start, retrieving a given number of records from a single thread&connection is nearly 2 orders of magnitude quicker than retrieving those same records via a connection made via a single connection in a separate thread.

    Running multiple clients in 2 separate threads cuts the time almost in half; and with 4 almost by 4; but it is still much faster to use a single thread/connection.

    This is true despite having deployed every speed-up pragma and option I can find.

  3. What is the recommended tcp/ip server module on CPAN for threaded programs?

    Personally, I don't use a module for tcp servers.

    Writing a threaded server that does what I need is pretty simple. Making someone else's implementation (if you can find one) do what I need it to do is always harder.

A few questions: What OS are you targeting? What does your data (schema) look like? What do your queries look like?

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re: Threads and DBD::SQLite? by BrowserUk
in thread Threads and DBD::SQLite? by BerntB

Title:
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, details, 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, summary, 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.