I have designed a myisam table for full text search purpose.
I have define full text for customer_code column. customer_code is varchar(20). It only search for "1234" and "0011" but not for "123" and "456".
My sql query is:
SELECT *
FROM tbl_customer
WHERE MATCH(tbl_customer.customer_code) AGAINST('123')
Do i have to define some more for it?
It may not work because of the word length being specified on ft_min_word_len
http://dev.mysql.com/doc/refman/5.1/en/fulltext-fine-tuning.html
So in debian/ubuntu its usually /etc/mysql/my.cnf
You need to set the min length there. In your case I suppose its 4 so you need to set it less than that.
Make sure after resetting the word length to restart the mysql. In addition you may need to drop the indexes and rebuilt or repair the table.
More over there are different way you can use wild card on full text search. Check the following this might help you.
http://forums.mysql.com/read.php?107,113504,113504
In WAMP you can find the configuration file on WAMP wizard or in
\wamp\bin\mysql\mysql{version}\my.ini
Related
I have Question, in my application needed setting type for varbinary in my database i have 8 field name using varbinary(max), like as using sql server varbinary(max) but i already did varbinary(60000) that's is not problem database still running fine, but after i tried to using varbinary(60000) for each field name, showing error like below
can someone help me for solving this problem i have tried to setting ROW_FORMAT to COMPRESSED,DYNAMIC but still cannot set varbinary(60000) for each field name.
Thanks in advance
As the error message says, MySQL has row size limit of 65535. You can change the columns to use TEXT datatype so you won't hit the row size limit.
See MySQL documentation - Limits on Table Column Count and Row Size for more info.
I'm using MySQL FullText Index Search on my system and when I search with 3 characters the query works well but when I search with 2 characters the query returns null.
I use this query:
select *
from table
where MATCH (description) AGAINST ('+gp*' IN BOOLEAN MODE)
I already use this command show variables like 'ft%' to get the value of ft_min_word_len and the value is 4. It is strange that with 3 characters the query works.
However i tried to change this value on file /root/.my.cnf. (I use Ubuntu 14.04 and server pilot). I add this to the file:
[mysqld]
innodb_ft_min_token_size=2
ft_min_word_len=2
Restart the mysql, drop index and create index.
Although when I execute this command again show variables like 'ft%' the value still remains 4.
How do I use mysql full text search with 2 characters?
Any help will be appreciated!
Correct location of the my.cnf?
/etc/mysql/my.cnf
Take a look here or here
I am using XAMPP and I want to store image paths on my phpmyadmin database and I saw here: Database design : preferred field length for file paths that the best options to store file paths should be VARCHAR(MAX) or NVARCHAR(MAX).
As I cannot set VARCHAR(MAX) or NVARCHAR(MAX) on my phpmyadmin,
How can I store these paths on my database properly? I mean, what is the best option to store them on my database?
Edit: I have seen the question that has been marked as possible duplicate. I know that I can "simulate" the VARCHAR(MAX) on phpmyadmin but, as it does not exist by default, it would be better to use another length instead of MAX?
I think that if you set a path of length 100 and you have your MAX as the limit is not worth so VARCHAR(suitable number) would be better than VARCHAR(MAX) (or at least I think it would be better). I am new with MySQL so I do not know about the entrails of it (by the moment).
I think it can be problems of performance or maybe memory but I cannot find anything on the official documentation so please if you find something related post here.
Is there a suitable length for store paths on phpmyadmin? A number of length that it is usually used (and why).
Thanks in advance!
the best way to do this is to create a VARCHAR(255) column.
255 because normally standard url should not exceed this size
If you can't do it directly you can try :
1) create your column as VARCHAR
2) in the structure part you can set the size that will be the max size of your column
I am trying to run this query but there are no values being retrieved , I tried to find out the length of characters till which values are returned. Length was 76 characters.
Any suggestions?
SELECT tokenid FROM tokeninfo where tokenNumber = 'tUyXl/Z2Kpua1AvIjcY5tMG+KlEhnt+V/YfnszF5m1+q8ngYvw%L3ZKrq2Kmtz5B8z7fH5BGQXTWAoqFNY8buAhTzjyLFUS64juuvVVzI7Af5UAVOj79JcjKgdNV4KncdcqaijPQAmy9fP1w9ITj7NA==%';
The problem is not the length of the characters you select, but in the characters, which are stored in database field itself. Check the tokenNumber field in your database schema - if it is varchar, or blob or whatever type, what is the length, etc...
You can insert/select pretty much more than 76 characters in any database, but you can get less that 76, as in your case, it depend on how you handle the field they are stored in.
A quick way to see the tokeninfo table properties is to run this query:
SHOW COLUMNS FROM tokeninfo;
If the data types differ from what you expect them to be based on a CREATE TABLE statement, note that MySQL sometimes changes data types when you create or alter a table. The conditions under which this occurs are described in Section 13.1.10.3, Silent Column Specification Changes.
the max size would be limited by the variable max_allowed_packet
so, if you do a
show variables like 'max_allowed_packet'
it will show you the limit. By default, it is set to
1047552 bytes.
If you want to increase that, add a line to the server's
my.cnf file, in the [mysqld] section :
set-variable = max_allowed_packet=2M
and restart mysql server.
I am using fulltext searching in mysql to search a database of videos I have, however when I search my videos some results will never get returned because the title I am searching for is less than the ft_min_word_len set in MySQL's settings.
mysql_query("SELECT MATCH(videoDescription) AGAINST('".$searchString."' IN NATURAL LANGUAGE MODE)
FROM videos
LIMIT ".$start.",".$end."");
I tried firing up the mysql console to change the setting, however it told me it is read only. The only possible solution I have seen is to have the setting overridden at startup with option files. How do I use option files to overwrite the ft_min_word_len to 2 at startup?
ft_min_word_len is a system variable, that has to be set at the startup of the MySQL server.
This can be done passing parameters on the command-line used to start MySQL, or (recommended, I'd say), using a file containing options -- generally, for example, something like /etc/my.cnf or /etc/mysql/my.cnf should do the trick.
For more informations about setting system variables, you can take a look at the following section of the manual :
4.2.3. Specifying Program Options
Also, don't forget that you'll have to rebuild your fulltext index, after changing that parameter, so the new value is taken into account.