Re: Combine Top-k with similarity search extensions
| От | tim.child@comcast.net |
|---|---|
| Тема | Re: Combine Top-k with similarity search extensions |
| Дата | |
| Msg-id | 455540989.1058519.1448035230053.JavaMail.zimbra@comcast.net обсуждение исходный текст |
| Ответ на | Combine Top-k with similarity search extensions (Shmagi Kavtaradze <kavtaradze.s@gmail.com>) |
| Ответы |
Re: Combine Top-k with similarity search extensions
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| Список | pgsql-novice |
Shmagi,
Take the first 20 text characters and compute and store the CRC32 or MD5 of that value. That value acts as a signature. You can then find all distinct signatures, or all rows with duplicate signatures for further analysis You could event try building a signature on the full text string.
From: "Shmagi Kavtaradze" <kavtaradze.s@gmail.com>
To: pgsql-novice@postgresql.org
Sent: Friday, November 20, 2015 2:21:36 AM
Subject: [NOVICE] Combine Top-k with similarity search extensions
To: pgsql-novice@postgresql.org
Sent: Friday, November 20, 2015 2:21:36 AM
Subject: [NOVICE] Combine Top-k with similarity search extensions
I am performing similarity check over a column in a table with about 3500 entries. Column is populated with text data from text file. Performing a check results in 3500 * 3500 rows and it takes forever to calculate for my virtual machine. Is there any way to calculate for top-k results, to decrease amount and time needed? What I mean is that, for example when checking two sentences, if first several words does not match, to stop checking that sentences and move on.
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