MobileHacks
New Member
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
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