Searching the text of a collection of documents or free text fields in a database to find those containing a word or combination of words.

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32
votes
5answers
10k views

What database technologies do big search engines use? [closed]

Does anybody knows how Google or Yahoo perform searches for keywords against very very huge amounts of data? What sort of database or technologies do they employ for this? It takes few milliseconds, ...
15
votes
3answers
3k views

How is LIKE implemented?

Can anyone explain how the LIKE operator is implemented in current database systems (e.g. MySQL or Postgres)? or point me to some references that explain it? The naive approach would be to inspect ...
14
votes
1answer
3k views

There is insufficient system memory in resource pool 'internal' to run this query

One of our production servers is reporting an error in the log Error: 701, Severity: 17, State: 123. There is insufficient system memory in resource pool 'internal' to run this query. I ...
12
votes
5answers
6k views

SQL Server 2008 Full Text Index Never Seems to Complete

Our website has a SQL Server 2008 R2 Express Edition database with full-text indexing for our website search. Each time a new record is added or updated in one of the indexed tables, the indexing ...
9
votes
2answers
606 views

SQL Server Filetable document properties

I'm using SQL Server 2012's Filetable to store documents and search them with Semantic Search. I was wondering if there is a way to list all the document properties (meta data). There is a way to ...
8
votes
2answers
174 views

Trigram search gets much slower as search string gets longer

In a Postgres 9.1 database, I have a table table1 with ~1.5M rows and a column label (simplified names for the sake of this question). There is a functional trigram-index on lower(unaccent(label)) ...
8
votes
2answers
2k views

Slow ORDER BY with LIMIT

I have this query: SELECT * FROM location WHERE to_tsvector('simple',unaccent2("city")) @@ to_tsquery('simple',unaccent2('wroclaw')) order by displaycount I'm happy with it: "Sort ...
7
votes
1answer
3k views

Where are Full-Text indexes in SSMS 2008 R2

I created a new database, a few tables, and full-text index & catalog using SQL Server Management Studio without any problem. I wanted to copy the T-SQL creation scripts for each of those to ...
7
votes
1answer
78 views

Will a Full-Text Catalog with Track changes: AUTO automatically update if Change Tracking for that table is not enabled?

I have this database table that is suppose to keep the full-text index up-to-date. However I am not seeing it happening at all (no error in the log because the last log I see was when I triggered it ...
7
votes
1answer
328 views

Guidelines for full-text index maintenance

What guidelines should be considered for maintaining full-text indexes? Should I REBUILD or REORGANIZE the full-text catalog (see BOL)? What is a reasonable maintenance cadence? What heuristics ...
7
votes
1answer
834 views

Full-text index in partitioned table

I have a table with just over a million records with a full-text index. This table has been split in two in the past, and the data older than a certain date is moved to another table with the exact ...
7
votes
3answers
1k views

Full text search results in a large amount of time spent in 'FULLTEXT initialization'

I'm currently trying to run some queries against a data dump of Stack Overflow's comments. Here's what the schema looks like: CREATE TABLE `socomments` ( `Id` int(11) NOT NULL, `PostId` int(11) ...
7
votes
1answer
2k views

Full text search through many tables in MySQL

We have high traffic NEWS websites, I want to add a feature that every user can search through over all content of site, such as news, polls, comments, galleries,etc . Each of contents type has its ...
7
votes
2answers
153 views

Can I get the union of the a Postgres fulltext index?

I have a fulltext index on a table. Is it possible to retrieve the set of terms used in the index (gist or gin)? With weights if possible? To clarify: If I have the following table: create table ...
7
votes
1answer
161 views

Update queries slower after enabling SQL Server Full-Text Index

I have an asp.net website with many insert, update, and delete queries running against my database. A few days ago I create a Full-Text Index on two columns of one of tables. After that I realized ...
6
votes
2answers
19k views

Why does simple ALTER TABLE command take so long on table with full-text index?

I have a large (~67 million rows) name-value table that has full-text indexing on the value column (DataValue). My question is: If I try to run the following sql command: ALTER TABLE VisitorData ...
6
votes
2answers
11k views

How to search for a specific column name in all the tables in MySQL Workbench?

In MySQL Workbench, is it possible to search for a specific column name in all the tables? (Writing the string to look for in the field at the top right does nothing). Thank you.
6
votes
2answers
1k views

What characters are word breakers in English for SQL Server 2005 and 2008 R2?

I can find what DLL supports English word breakers by using sp_help_fulltext_system_components but I have not been able to find an actual list of the word breaking characters for English (like blank, ...
6
votes
1answer
6k views

Why full-text-search returns less rows than LIKE

I don't get full-text-search working as I want it to, and I don't understand the differences in the resultlists. Example statements: SELECT `meldungstext` FROM `artikel` WHERE `meldungstext` LIKE ...
6
votes
1answer
2k views

Can I have an InnoDB master and MyISAM slaves with Full-Text for searching?

I'd like to use InnoDB on the master, for its transactional ability, but MyISAM on the slaves for the full-text search ability. Is this possible?
6
votes
1answer
375 views

BM25 (full-text search) implementation in SQL Server

I've hit a stump, while trying to implement the BM25 algorithm in SQL Server 2008 R2. I know that SQL Server includes the Full-Text Search option, which already implements a variant of BM25, but I ...
6
votes
2answers
2k views

Why does MyISAM support FULLTEXT Searching and InnoDB does not?

I know the basic differences between the MyISAM and InnoDB engines. In MySQL 5.6 beta, InnoDB will support fulltext search. But, I wonder why previous versions of InnobDB didn't support FTS? My guess ...
6
votes
1answer
17k views

Why is LIKE more than 4x faster than MATCH…AGAINST on a FULLTEXT index in MySQL?

I'm not getting this. I've got a table with these indexes PRIMARY post_id INDEX topic_id FULLTEXT post_text Table has (only) 346 000 rows. I am trying to perform 2 queries. SELECT ...
5
votes
1answer
273 views

Full Text Search Term Casing Affects Results

I have been experiencing a full text problem when searching using CONTAINS. I have the full text catalog accent sensitive setting set to false. The table contains following rows: Microsoft C# ...
5
votes
1answer
7k views

Does SQL Server 2014 Express, with Advanced Services, actually support full text search?

I've installed SQL Server 2014 Express edition, with advanced services. I was hoping to try out the full-text search features. I read here that full text search is supported by the 2014 express ...
5
votes
1answer
198 views

Slow fulltext search for terms with high occurence

I have a table that contains data that is extracted from text documents. The data is stored in a column called "CONTENT" for which I have created this index using GIN: CREATE INDEX ...
5
votes
1answer
2k views

How to install SQL Server Express 2005 with Full text search

I am in need to Install SQL server 2005 Express edition with Full Text Search capability. I don't know what to download and the order of installing the Database management system. Could someone ...
5
votes
2answers
1k views

How to sync a database with an external full text engine?

How do you keep your external full-text engine (Lucene, Solr, etc) in sync with your database data? For example, keeping track of inserts, deletes, updates. My current solution involves a big union ...
5
votes
2answers
504 views

MySQL fulltext selection performance

I have 1.5M rows in a table. Following is the table create code: CREATE TABLE `jobs` ( `id` INT(8) NOT NULL AUTO_INCREMENT, `job_id` VARCHAR(50) NOT NULL DEFAULT '', `title` VARCHAR(255) ...
5
votes
1answer
1k views

MySQL EXPLAIN doesn't show 'use index' for FULLTEXT

I have a basic table : create table fullTextTest ( id INT(11) NOT NULL, superText CHAR(255) NOT NULL, superLongText TEXT NOT NULL, primary key (`id`), FULLTEXT KEY `superText` ...
5
votes
2answers
4k views

Postgres full text search with multiple columns, why concat in index and not at runtime?

I've come across full text search in postgres in the last few days, and I am a little confused about indexing when searching across multiple columns. The postgres docs talk about creating a ts_vector ...
5
votes
2answers
695 views

SQL Server Full Text Search - .rtf files incorrectly indexed by rtf tags

I've set up a full-text index on my SQL Server DB on a varbinary(max) column. I have a type column specified, which contains the extension of the file, such a ".doc", ".pdf" etc. However, I have ...
5
votes
1answer
836 views

Full-text search with german umlauts

I created a table using German (Germany) as the Full-text language, in the settings I tried setting accent sensitivity to both sensitive and insensitive. I, however, get following odd results. The ...
5
votes
1answer
209 views

Fulltext stoplist replication

In MS SQL Server 2008 R2 there is replication of table with fulltext index on it. But stoplist that is associated with replicated fulltext index doesn't replicate. Is there any possibility to ...
5
votes
1answer
1k views

SQL Server 2008 Containstable generate negative rank with weighted_term

I have a table with full text search enabled on Title column. I try to make a weighted search with a containstable but i get an Arithmetic overflow for the Rank value. The query is as follow SELECT ...
5
votes
2answers
288 views

Recommended structure? %70 write %30 read. 10M row. 200 query/sec. Select, update, insert, search

Followings are what I need to do on my project: 1- If a search term is new and unique, then add the search term 2- Show lastest searched 1000 search terms (I don't need to store dates of all search ...
4
votes
3answers
933 views

Full Text Search With PostgreSQL

i have a table with this rows: Stickers ------------------------------------------------------ ID | Title |Keywords (ts_vector) ------------------------------------------------------ ...
4
votes
4answers
6k views

Property PopulationStatus is not available for FullTextCatalog… How to fix?

I've created a new catalog (case insensitive, make default catalog), when I try to right click > properties to add tables I get this error: Property PopulationStatus is not available for ...
4
votes
2answers
5k views

Installing Full Text Search to SQL Server 2008 R2

I installed sql server 2008 R2 Express successfully, then realised I need to get Full Text Search. So I downloaded the "Advanced Services Installation Package", but when I run it there is no option in ...
4
votes
1answer
4k views

Using Solr/Lucene for searching non-text tables?

I am creating a web application to retrieve subsets of one large (4m rows) table. The 4m rows only change once a year. The table has 200+ columns of types boolean and numeric. It has no text columns. ...
4
votes
2answers
8k views

How to set full text catalog location SQL Server 2008/2012

I want to upgrade my SQL Server 2005 database to SQL Server 2012. In SQL Server 2005 you can set the location of the full text catalog when you create it. But in SQL Server 2012 (and in SQL Server ...
4
votes
4answers
3k views

Sql server full text search performance with additional conditions

We have a performance problem with SQL Server (2008 R2) Full text search. When we have additional where conditions to full-text search condition, it gets too slow. Here is my simplified query: ...
4
votes
1answer
6k views

Mysql fulltext search my.cnf optimization

I have open a question on http://serverfault.com/questions/353888/mysql-full-text-search-cause-high-usage-cpu Some user recommended asking here. We built a news site. Every day we will input tens of ...
4
votes
2answers
119 views

Integrate MySql Full Text searches in CMS

I'm developing my own CMS and using MySql v5.5 DB to save the content items records. Due to a technical limitations, I can't upgrade my database to a newer version that support Full-Text searches on ...
4
votes
2answers
2k views

maintaining full text index on large table

I'm on SQL Server 2008 and have a table, for reporting purposes, with 500,000 records that will easily reach the millions. The table will employ a full text index for rapid searching on a handful of ...
4
votes
1answer
2k views

Are there disadvantages to using Full-Text Search in SQL Server?

Are there disadvantages to using Full-Text Search in SQL Server? Is there much of an increased CPU or memory load on the server?
4
votes
1answer
2k views

Alternatives to LIKE and FTS for mid name search

I have a question about what are the alternatives for LIKE '%%' and Full-Text Search when it comes to searching organisation names, firstnames, surnames, etc. The LIKE '%%' causes table scan, however ...
4
votes
1answer
625 views

How much data can SQL Server full text indexing handle?

I realize that the question is vague and it depends on hardware and our needs. We currently have 5 million rows of data, a total of 5GB of data which we want to index using full text indexing. Our ...
4
votes
1answer
587 views

Can Oracle Text query return the terms found?

I am querying an Oracle 10g database. The database contains a table with documents that has an oracle text index. I query the database using a query like SELECT SCORE(1), title from news WHERE ...
4
votes
1answer
215 views

Can jsonb do fast search by *value* or even a partial value? Other types?

I have a person table where arbitrary data must be inserted. Since I'm using Postgres 9.4, jsonb appears to be the right choice. Example data: id: 1, name: "Joe Doe", preferences: { color: "red" , ...