[TYPO3-dev] indexed_search kills server

[Peter Russ]

--- Original Nachricht ---
Absender:   Steffen Kamper
Datum:       21.05.2008 12:20:
> "Ernesto Baschny [cron IT]" <ernst at cron-it.de> schrieb im Newsbeitrag 
> news:mailman.1.1211364311.13646.typo3-dev at lists.netfielders.de...
>> Steffen Kamper wrote: on 21.05.2008 11:26:
>>
>>> on my server i encountered massive problems with indexed_search.
>>>
>>> Have a look to query times:
>>>
>>> # Time: 080521 10:18:31
>>> # User at Host: web2[web2] @ localhost []
>>> # Query_time: 555  Lock_time: 0  Rows_sent: 30  Rows_examined: 21263272
>>> SELECT IR.phash
>>>                         FROM index_words IW,
>>>                                                 index_rel IR,
>>>                                                 index_section ISEC
>>>                         WHERE
>>>                                 IW.baseword LIKE '%einrichtung%'
>>>                                                 AND IW.wid=IR.wid
>>>                                                 AND ISEC.phash = IR.phash
>>>                                                 AND ISEC.rl0 IN (1)
>>>                                                  AND is_stopword=0
>>>                         GROUP BY IR.phash;
>> Even for this amount of rows it seems mysql is taking a bit "too much" 
>> time. I guess that your server is not well tuned for the Apache + MySQL 
>> configuration.
>>
>> In one particular installation I have about 6 million entries in the 
>> index_rel table (where you have 21 million) and the same query returns in 
>> about 0.21 secs, and this is being hosted on a virtual environment (xen 
>> based).
>>
>> So I guess your 555 secs are caused by memory exhaustion, server having to 
>> swap and the whole I/O performance going down to the ground. Consider 
>> tuning the mysql + apache combination to not go much over the amount of 
>> available RAM (by limiting max_connections and MaxClients) and tweak MySQL 
>> to make better use of the RAM. Also make sure you have fast HDD-access, 
>> make use of NCQ (if possible), etc.
>>
>> Cheers,
>> Ernesto
> 
> Thanks for your suggestions. I forwarded this to my sysadmin and he will 
> check your proposals.
> 
> vg Steffen 
> 
> 

Fulltext index!

Peter.

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