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[EP-tech] Re: Antwort: Use of truncation in advanced searches

Hi Giles,
One thing we did on our platform was the change described here:
https://github.com/eprints/eprints/issues/120 (see also: http://www.eprints.org/tech.php/18677.html).

The description of this issue is around simple searches (when you?re not using Xapian), but I don?t know if it would have any effect on the advanced searches too.

In some circumstances, MySQL takes longer to work out the best way to run a query than it would take just running the query inefficiently. This change makes it try less iterations to find the ?best? way to run the query.

Might be worth a try?


From: eprints-tech-bounces at ecs.soton.ac.uk [mailto:eprints-tech-bounces at ecs.soton.ac.uk] On Behalf Of martin.braendle at id.uzh.ch
Sent: 21 April 2015 10:19
To: eprints-tech at ecs.soton.ac.uk
Subject: [EP-tech] Antwort: Use of truncation in advanced searches

Hi Gilles,

our repo has about 80'000 records and 56% fulltext, so is comparable to yours.

Advanced search of thermograph* in

title: immediate (1-2 seconds)
documents (full text): 20-30 seconds. The mysql daemon goes up to 70-100% CPU load.

Quick search (Xapian):

title:thermograph*  : immediate
thermograph* : immediate

We recommend in our help page (http://www.zora.uzh.ch/help/) that Quick Search should be the tool of choice and only for very precise searches Advanced Search should be used.