Re: best practise/pattern for large OR / LIKE searches

Hi Pavel,

can you provide some link or other directions to the proposal? I guess it
was posted to this list or somewhere else?

Tomas

> Hello
>
> one year ago there was proposal for index support for LIKE %some%. The
> problem was extreme size of index size.
>
> I thing so you can write own C function, that can check string faster
> than repeated LIKE
>
> some like
>
> SELECT * FROM tbl WHERE contains(datanumber, '12345','54321',....)
>
> regards
> Pavel Stehule
>
> 2009/8/26 Ries van Twisk <pg(at)rvt(dot)dds(dot)nl>:
>> Hey All,
>> I am wondering if there is a common pattern for these sort of queries :
>> SELECT * FROM tbl WHERE datanumber LIKE '%12345%' OR LIKE '%54321%' OR
>> LIKE
>> '%8766%' OR LIKE '%009%', ..
>> The number of OR/LIKES are in the order of 50-100 items...
>> the table tbl is a couple of million rows.
>> The datanumber is a string that are maximum 10 characters long, no
>> spaces
>> and can contain numbers and letters.
>> Apart from creating a couple of index table to make the LIKE left
>> anchored
>> something like this :
>> tbl <----> tbl_4letters
>> tbl <----> tbl_5letters
>> tbl <----> tbl_3letters
>> or creating a functional index 'of some sort' are there any other
>> brilliant
>> ideas out there to solve such a problem (GIN/GIS???) ?
>> Searches are currently taking to long and we would like to optimize
>> them,
>> but before we dive into our own solution we
>> where wondering if there already common solutions for this...
>> Kind Regards,
>> Ries van Twisk
>>
>>
>>
>>
>>
>
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