SELECT firstname, lastname,comments
FROMusers
WHERE MATCH(firstname,lastname,comments)
AGAINST('$searchterm')
I tried the above one as query for search engine ,but mysql says FULL-TEXT INDEXING is supported only on MYISAM ,Engine i am using is innoDB,Please tell me the best way of coloumn INDEX searching ON InnoDB Engine.
Based on my knowledge, MySQL FTS has been available for InnoDB since version 5.6 (http://dev.mysql.com/tech-resources/articles/whats-new-in-mysql-5.6.html)
You should take a look at MySQL Fulltex search document here http://dev.mysql.com/doc/refman/5.5/en/fulltext-search.html
Basically, I think you should understand what is 'index' and how MySQL do indexing. This article is very useful for helping understand the mechanism behind MySQL fulltext search http://dev.mysql.com/doc/internals/en/full-text-search.html
There are several important concepts in full-text search:
Boolean mode
Natural language mode
I also recommend you read about stopwords list in MySQL FTS.
System variable likes ft_min_word_len is also important.
After understanding these things, I think you will know how to apply MySQL fulltext search properly.
Related
I'm using MySQL 5.3 and have no possiblilty to update it to a newer version (5.6 supports full-text search for innodb).
So my question is, should I user Myisam instead so I can use full-text search for my forums table?
The users need to be able to search in the table or should I solve it someway else, (what way?).
EDIT: Or should I use LIKE in SQL?
I have a problem. I have a managed VPS server running MySQL 5.1.x. I am currently building a new database where I want to store tweets (via search, stream, timeline etc). So I want to use InnoDB database engine because of the row locking! But unfortunately, MySQL 5.1 does not support Full-text search in InnoDB tables.
The problem is that I cannot update my server by myself. So I cannot install MySQL 5.6 (that should support Full-text search) and I cannot install lucene (or solr or whatever).
Are there other options to achieve Full-text search in MySQL or whatever. Or maybe in PostgreSQL (never used that before)
The only other option I have so far is going to an unmanaged VPS but I don't prefer that :)
You can take a look to MyISAM engine but it's not transactional.
The other other possible solution is create another table with engine MyISAM or ARIA and create a relationship between the new table and the "store tweets" table, so before insert into the 'new table' make sure that 'store tweets' it's not locked.
I'm currently doing research on the best ways to provide an advanced search for my php project.
I have narrowed it down to using FULLTEXT search rather than using LIKE to find matching strings in a table row. However, to do this it appears I need to sacrifice using the InnoDB engine which will make me lose the ACIDity of transactions and table relationships.
Is it really worth using the MYISAM mysql engine or are there better ways of providing search functionality.
Any pointers would be appreciated!
It really depends on the application... Using MyISAM for anything that needs referential integrity is an instant fail. At the same time, it's text search isn't all that efficient.
Basically, there are two ways to go. If you find you don't need true referential integrity, consider a NoSQL datastore. MongoDB is a great document store database.
If, on the other hand, you really need referential integrity, but also need fast, indexed full-text searching, you might do better to use Sphinx or Apache Solr to create an indexed cache for full-text search.
Either way, I consider MyISAM to be a legacy datastore. I wouldn't use it on a new project. YMMV.
MyISAM has several drawbacks - lack of transaction support, table-level locks which makes it very slow in heavy read+write load type. Another inconvenience of MyISAM tables - they are not crash safe so you can lost some data in case of unexpected shutdown or power loss on server. However MyISAM is very fast on some queries.
Regarding the FullText search I would suggest to use InnoDB + external search engine like Lucene or Sphinx so you could benefit from both safe and reliable storage engine and fast Full-text queries.
For quick start with InnoDB and Sphinx you can refer to http://astellar.com/2011/12/replacing-mysql-full-text-search-with-sphinx/
MySQL 5.6 supports FULLTEXT indexes with InnoDB (released Feb 2013). See:
http://dev.mysql.com/doc/refman/5.6/en/fulltext-search.html
I realize that MySQL 5.6 is still in beta, but does anyone have experience using the new InnoDB FTS engine? How does it compare to something like Sphinx?
Thanks
Jason
Never used Sphinx, but tried MySQL 5.6 FTS on an Innodb table with about 170k rows. Made an FTS index on the name column (contains all names of a person). To find a word in any position of the string MATCH(name) AGAINST("+word*") IN BOOLEAN MODE does work a lot faster (2-3 times in my case) than using name LIKE "word%" OR name LIKE "% word". However when making joins do check EXPLAIN to see if the FTS index is actually used. It seems MySQL optimizer is not that good at guessing when the FTS index should be used.
The FULLTEXT feature that formerly required downloading a special build from labs.mysql.com is now part of the mainline MySQL build in 5.6.5 and up (still in beta). The documentation for the FULLTEXT functions now includes the InnoDB-specific details: MySQL Full-Text Search Functions
Remember, that Sphinx search is developed for full text searching in mysql it's just a feature...
Here you have compare of sphinx and mysql FTS:
http://www.percona.com/files//presentations/opensql2008_sphinx.pdf
Here is performance test of InnoDB FTS compared to MyISAM:
http://blogs.innodb.com/wp/2011/07/innodb-fts-performance/
InnoDB its bit faster especially in indexing, but it's still far away from sphinx performance...
I've done some searching into fulltext searches for MySQL InnoDB and found a few on stack overflow, but they either don't provide an exact solution or they are a bit dated and I think it's time to rediscuss.
All of my tables are InnoDB and I'd prefer not to lock the entire database with MyISAM. What are my options in regards to fulltext searching? Are there any simple solutions? I'd like to do the equivalant of MATCH (content) AGAINST ("my search query" IN BOOLEAN MODE)
There is no equivalant of MATCH AGAINST in Innodb. Fulltext searching is one of pros of using MyIsam. So you should use standalone seaching server like Sphinx or Solr
InnoDB full-text search (FTS) is finally available in MySQL 5.6.4 release.
These indexes are physically represented as entire InnoDB tables, which are acted upon by SQL keywords such as the FULLTEXT clause of the CREATE INDEX statement, the MATCH() ... AGAINST syntax in a SELECT statement, and the OPTIMIZE TABLE statement.
From FULLTEXT Indexes