while ( defined($tail_line = $tail_file->read) ) {
    foreach my $key ( keys %pattern ) {

[download]
That's rather inefficient. If the patterns are just strings (not regexes), you can try something along these lines: 
my $regex = join '|', map quotemeta, keys %patterns;
while ( defined($tail_line = $tail_file->read) ) {
   if ($tail_line =~ m/($regex)/) {
       print "logging $pattern{$1} for $tail_line";
   }
}

[download]

If you can find a possibility to pipe the log directly into your program's STDIN, you can get rid of File::Tail, for which I don't know how efficient it is.

I'd first try to open a connection with DBI, prepare an insert statement, and execute it each time a match is found. If that turns out to be too slow, you can still search for more elaborate ways.

In reply to Re: Reading from a fast logfile and storing on Oracle by moritz
in thread Reading from a fast logfile and storing on Oracle by longjohnsilver

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.