The prior responses, especially
VSarkiss's, are absolutely correct. You will want to verify this query from whatever commandline tools your RDBMS provides. A few thoughts on how to speed up a query:
- Verify that you have indices on the columns you're searching on. Also, you will want to verify that the indices are being used. DBD::mysql, for example, passes all parameters in quoted, so they all look as if they are strings to MySQL. This means that comparisons to numeric columns will not use any indices, even if they are available.
- Put your search conditions in a WHERE clause, very much like VSarkiss suggested in his update. This allows the RDBMS to optimize the query better.
- Depending on the size of your tables and the size of the machine, some queries might just run slowly. If you're working with 1G tables and you have 256M of RAM, you're going to have issues.
Also, you might want to check the value of your webserver timeout. In Apache, the variable is called Timeout and is found in the httpd.conf. (I don't know about others, like IIS.) Some queries will simply take 1-2 minutes and if your timeout is set to 90 seconds (which isn't uncommon), you're going to have issues.
Being right, does not endow the right to be rude; politeness costs nothing.
Being unknowing, is not the same as being stupid.
Expressing a contrary opinion, whether to the individual or the group, is more often a sign of deeper thought than of cantankerous belligerence.
Do not mistake your goals as the only goals; your opinion as the only opinion; your confidence as correctness. Saying you know better is not the same as explaining you know better.
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: |
| & | | & |
| < | | < |
| > | | > |
| [ | | [ |
| ] | | ] |
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.