The Arcive of Official vBulletin Modifications Site.

FractalizeR: Search limits · **Released**: 06-29-2009

Introduction
Some time ago I received several messages from my server about database error. They are described here. It looked like malicious server overload or hack attempt. It seemed to me like some hacker found the way to flood my server with expensive queries. Some time after I found the reason.

This is not an engine bug, at least it doesn't look like one. But until devs will make a decision (I guess they are too busy with VB4), I wanted my forum to be protected. So, I made this addon. It should be compatible with vb 3.6.x, 3.7.x and 3.8.x

Engine specifics
As far as I can understand, on search, Vbulletin makes at least two additional queries for each word you searched for (one per word table, second - for post table to find posts for that word). If some words ORed - results joined. If they are ANDed - an intersection is calculated in PHP via array_intersect. Those queries are without any LIMIT clause and can make a load on server. Actually, that is why search is so resource-intensive.

What does it do?
It limits the amount of search operators and overall search query word count to prevent high server load.

Hack is disabled after installation and you need to setup limits in Vbulletin options after installation.

How to install/upgrade?
Just import/reimport product xml.

What are the recommended settings for big boards?
I think, you can limit overal operators to 4 and a number of search words to 7-10. I don't think regular users will push the limits.

Version history:
1.0
Initial release

FractalizeR · #12 07-01-2009, 01:04 PM

Of course

Attach it and I will reattach it to first post. Of course you will be credited.

cad2go · #13 07-12-2009, 02:13 PM

Thanks Fractalizer

FractalizeR · #14 07-12-2009, 06:34 PM

You are welcome

xorex · #15 10-02-2011, 06:32 AM

"Global maximum for search operators" not working for me

I set it to 5 and try search

Quote:

test OR test2 OR test3 OR worlds OR test234 NOT testing NOT verify NOT apple

results:

Quote:

test OR test2 OR test3 OR worlds OR test234, -testing, -verify, -apple

Maximum number of OR operators allowed - 4

Maximum number of NOT operators allowed - 4

Or "Global maximum for search operators" should be equal to or more both settings above ?

webmastersitesi · #16 01-23-2012, 08:31 PM

Very clever and lovely plugin. I thank you so much for this.

X vBulletin 3.8.12 by vBS Debug Information
Page Generation 0.06694 seconds Memory Usage 2,284KB Queries Executed 21 (?)
More Information
Template Usage: (1)SHOWTHREAD (1)ad_footer_end (1)ad_footer_start (1)ad_header_end (1)ad_header_logo (1)ad_navbar_below (1)ad_showthread_beforeqr (2)bbcode_quote (1)footer (1)forumjump (1)forumrules (1)gobutton (1)header (1)headinclude (1)modsystem_post (1)navbar (4)navbar_link (120)option (1)pagenav (1)pagenav_curpage (1)pagenav_pagelink (6)post_thanks_box (1)post_thanks_box_bit (6)post_thanks_button (1)post_thanks_javascript (1)post_thanks_navbar_search (1)post_thanks_postbit (6)post_thanks_postbit_info (5)postbit (5)postbit_attachment (6)postbit_onlinestatus (6)postbit_wrapper (1)spacer_close (1)spacer_open (1)tagbit_wrapper Phrase Groups Available: global inlinemod postbit posting reputationlevel showthread	Included Files: ./showthread.php ./global.php ./includes/init.php ./includes/class_core.php ./includes/config.php ./includes/functions.php ./includes/class_hook.php ./includes/modsystem_functions.php ./includes/functions_bigthree.php ./includes/class_postbit.php ./includes/class_bbcode.php ./includes/functions_reputation.php ./includes/functions_post_thanks.php Hooks Called: init_startup init_startup_session_setup_start init_startup_session_setup_complete cache_permissions fetch_threadinfo_query fetch_threadinfo fetch_foruminfo style_fetch cache_templates global_start parse_templates global_setup_complete showthread_start showthread_getinfo forumjump showthread_post_start showthread_query_postids showthread_query bbcode_fetch_tags bbcode_create showthread_postbit_create postbit_factory postbit_display_start post_thanks_function_post_thanks_off_start post_thanks_function_post_thanks_off_end post_thanks_function_fetch_thanks_start fetch_musername post_thanks_function_fetch_thanks_end post_thanks_function_thanked_already_start post_thanks_function_thanked_already_end post_thanks_function_fetch_thanks_bit_start post_thanks_function_show_thanks_date_start post_thanks_function_show_thanks_date_end post_thanks_function_fetch_thanks_bit_end post_thanks_function_fetch_post_thanks_template_start post_thanks_function_fetch_post_thanks_template_end postbit_imicons bbcode_parse_start bbcode_parse_complete_precache bbcode_parse_complete postbit_attachment postbit_display_complete post_thanks_function_can_thank_this_post_start pagenav_page pagenav_complete tag_fetchbit_complete forumrules navbits navbits_complete showthread_complete
Messages:

Благодарность от:
xorex

The Arcive of Official vBulletin Modifications Site.

It is not a VB3 engine, just a parsed copy!