Beefy Boxes and Bandwidth Generously Provided by pair Networks
more useful options
 
PerlMonks  

comment on

( [id://3333] : superdoc . print w/replies, xml ) Need Help??
True, but here (and in Oracle and other DBs with this feature), it's not magical. That is, you have to decide ahead of time exactly what expression you want to index on and then make your WHERE conditions query on exactly that expression. That said, especially for simple things like case-insensitive comparison (by creating an index on LOWER(somecol) ) this feature can offer an enormous performance benefit in many cases.

In reply to Re^2: (OT) Don't blow that index dude. by Errto
in thread (OT) Don't blow that index dude. by demerphq

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



  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or How to display code and escape characters are good places to start.