discovery of functional dependencies from data
Hello everyone, I was wondering if anyone could provide me with some sort of code for discovering functional dependencies from data. I can't use wizards that are available in DBMS. A starting point would be appreciated also. P.S. What I want is to discover the relations between two columns without having any meta data available. Best regards, Javad Bakhshi, Computer Science M.Sc Department of IT, Uppsala University
Unknown database error
Hi, I get an Unknown database error when I am trying to connect to mysql using C API. I have created the database in mysql prompt as root: CREATE DATABASE Lr0; I am pretty sure that the problem is a ownership issue, because when I do ls -l in my datadir I get: [javad64@udbl64 data]$ ls -l total 20532 -rw-rw 1 javad64 mysql 10485760 Oct 26 14:10 ibdata1 -rw-rw 1 javad64 mysql 5242880 Oct 26 14:10 ib_logfile0 -rw-rw 1 javad64 mysql 5242880 Oct 19 15:28 ib_logfile1 drwx-- 2 javad64 javad64 4096 Oct 26 14:35 Lr0 drwx-- 2 javad64 mysql 4096 Oct 22 11:04 mysql drwx-- 2 javad64 mysql 4096 Oct 22 11:04 test which shows Lr0 doesn't have mysql ownership. my question is: 1- Why does this happen? While I am creating the database in mysql prompt as root. 2- How can I fix it? I don't have root access in the system I am using so the chown solution is off table. Best regards, Javad Bakhshi, Computer Science M.Sc Department of IT, Uppsala University
Please do not open the link that was sent to you from my email address
Dear Friends, There has been some problems with my mail box and some spam emails have been sent to you from my email. Please do not open the link that was sent to you from my email address!! Sorry for the problem caused. Best regards, Javad Bakhshi, Computer Science M.Sc Department of IT, Uppsala University
Re: ERROR 2013 (HY000): Lost connection to MySQL server during query
Hi, Still have the same problem and changing connect_timeout didn't help. Any other Ideas? Is there even any solution to this? Best regards, Javad Bakhshi, From: mail...@securitylabs.it mail...@securitylabs.it To: mysql@lists.mysql.com Sent: Thursday, March 1, 2012 11:09 AM Subject: Re: ERROR 2013 (HY000): Lost connection to MySQL server during query Il 01/03/2012 11:03, javad bakhshi ha scritto: Hi, I am trying to load data into my table from a very large file but after some time I get this error: ERROR 2013 (HY000): Lost connection to MySQL server during query My file size is around 4G and I have 220M lines in my file which have to be loaded in to my table. I have 10 of these files which have to loaded in the same table. My MySQL version is 5.1.59, I have changed the max_allowed_packet to 346030080. any ideas how I can solve this problem? Best regards, Javad Bakhshi, In order to resolve the problem you may need to increase these two values in mysql.ini or my.cnf, and restart mysql: wait_timeout = 28800 connect_timeout = 28800 -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql
ERROR 2013 (HY000): Lost connection to MySQL server during query
Hi, I am trying to load data into my table from a very large file but after some time I get this error: ERROR 2013 (HY000): Lost connection to MySQL server during query My file size is around 4G and I have 220M lines in my file which have to be loaded in to my table. I have 10 of these files which have to loaded in the same table. My MySQL version is 5.1.59, I have changed the max_allowed_packet to 346030080. any ideas how I can solve this problem? Best regards, Javad Bakhshi,
PID and LOG file
Hi, I am trying to install Mysql on linux which I don't have a root access. I have done the folowing : 1. Download source files from http://dev.mysql.com/downloads/mysql/ and un-tar thwm 2. configure the instalation using ./configure as: CFLAGS=-O3 CXX=gcc CXXFLAGS=-O3 -felide-constructors -fno-exceptions -fno-rtti ; \ ./configure --prefix=/bubo/home/h10/javad/scratch/mysql \ --enable-assembler \ --with-mysqld-ldflags=-all-static \ --with-client-ldflags=-all-static \ --with-mysqld-user=javad \ --with-unix-socket-path=/bubo/home/h10/javad/scratch/mysql/tmp/mysql.sock \ --localstatedir=/bubo/home/h10/javad/scratch/mysql/share \ --datadir=/bubo/home/h10/javad/scratch/mysql/data\ --enable-thread-safe-client 3. execute ./bin/mysql_install_db 4. execute bin/mysqld_safe to run mysql. but at this point I get the folowing error: Starting mysqld daemon with databases from /bubo/home/h10/javad/scratch/mysql/data ./bin/mysqld_safe: line 394: /var/log/mysqld.log: Permission denied ./bin/mysqld_safe: line 402: /var/log/mysqld.log: Permission denied STOPPING server from pid file /bubo/home/h10/javad/scratch/mysql/data/the.pid tee: /var/log/mysqld.log: Permission denied 15 13:14:18 mysqld ended tee: /var/log/mysqld.log: Permission denied I don't know why I get this error since I have changed the my.cnf to err-log=/bubo/home/h10/javad/scratch/mysql/data/the.log pid-file=/bubo/home/h10/javad/scratch/mysql/data/the.pid Best regards, Javad Bakhshi,
Re: Socket not found
Hi, I had the same problem recently restart the server so it can create your socket again and it should be all right. Best regards, Javad From: Andrew Moore eroomy...@gmail.com To: Peter Schrock peter.schr...@gmail.com Cc: mysql@lists.mysql.com Sent: Sunday, October 9, 2011 10:51 AM Subject: Re:Socket not found Hey Peter, 2 options; Check the socket key-value in the my.cnf file under the client section. Explicitly tell mysqladmin what one to use with the relevant cmd line option. See the documentation for syntax. Hth Andrew On 9 Oct 2011 09:21, Peter Schrock peter.schr...@gmail.com wrote: I just loaded and built three different versions of mysql and all three versions have given me the same results. When trying to change the password to root, this is what I get: ./mysqladmin: connect to server at 'localhost' failed error: 'Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)' Check that mysqld is running and that the socket: '/tmp/mysql.sock' exists! Help please. Peter
Re: Arrays
Hi again,
Thanks for the tips. My problem is:
I have a Function in Mysql that has some arguments in the signature as follows:
CREATE FUNCTION Myfunction( type TINYINT, sec SMALLINT, vid INTEGER,
way TINYINT, quid INTEGER, day TINYINT )
RETURNS CHAR(50)
BEGIN
DECLARE result CHAR(50);
DECLARE Temp DECIMAL(9,1);
SELECT Table1( vid, day, way) INTO Temp;
IF Temp IS NOT NULL THEN
SELECT CONCAT_WS(',',sec, 0, quid, Temp) into result;
ELSE
SELECT CONCAT_WS(',',sec, 0, quid, 0 ) into result;
END IF;
RETURN result;
END;
The problem seems to be solved by using CHAR but I really want to have a
sequence of Integers as the result not CHAR. The reason that I dont use a table
to insert the result into it and retrieve it later is that this process takes
more time that It should. Any thoughts?
Best regards,
Javad
From: Shawn Green (MySQL) shawn.l.gr...@oracle.com
To:
Cc: javad bakhshi javadbakh...@yahoo.com; Johan De Meersman
vegiv...@tuxera.be; mysql@lists.mysql.com mysql@lists.mysql.com
Sent: Monday, August 29, 2011 4:51 PM
Subject: Re: Arrays
On 8/27/2011 11:18, wrote:
2011/08/26 13:58 -0700, javad bakhshi
Thanks guys for the help. but my problem seems to stand unsolved.
Right, no arrays. Nothing is left but table. I used a temporary table, but
note that MySQL also does not let table be returned, or passed in. The
table-name will be *sigh* global.
If the table remains an active part of the connection, you always have access
to it. It is possible to pass the name of the table into a stored procedure and
use a prepared statement to do nearly anything you want to do with the data.
What is it you are trying to do with this array in the first place? It sounds
as though trying to process this data using the set-oriented functions of the
SQL language is causing you more of a problem than the fact that the language
doesn't have an array data type.
There are normally many ways to solve any problem. Perhaps if you shared the
problem you are trying to solve, you can see how many different ways the
members of the list can solve it without resorting to an array?
-- Shawn Green
MySQL Principal Technical Support Engineer
Oracle USA, Inc. - Hardware and Software, Engineered to Work Together.
Office: Blountville, TN
-- MySQL General Mailing List
For list archives: http://lists.mysql.com/mysql
To unsubscribe: http://lists.mysql.com/mysql?unsub=javadbakh...@yahoo.com
Re: Arrays
Hi,
None of the above. :) .This is just an academic research on a benchmark. I just
want to access my database with this function and return 4 Integer values.
I separated the numbers with comma to process on it later as an string and
split the result using string functions which did work. I was just wondering if
its possible with mysql to return a sequence of numbers or not. I think to
solve my problem among the ways mentioned before I will create a table with
Engine=Memory to speed up things. I don't think any other way is possible.
Thanks,
Javad
From: Shawn Green (MySQL) shawn.l.gr...@oracle.com
To: javad bakhshi javadbakh...@yahoo.com
Cc: mysql@lists.mysql.com mysql@lists.mysql.com
Sent: Friday, September 2, 2011 2:18 PM
Subject: Re: Arrays
Hello Javad,
On 9/2/2011 05:51, javad bakhshi wrote:
Hi again,
Thanks for the tips. My problem is:
I have a Function in Mysql that has some arguments in the signature as
follows:
CREATE FUNCTION Myfunction( type TINYINT, sec SMALLINT, vid INTEGER,
way TINYINT, quid INTEGER, day TINYINT )
RETURNS CHAR(50)
BEGIN
DECLARE result CHAR(50);
DECLARE Temp DECIMAL(9,1);
SELECT Table1( vid, day, way) INTO Temp;
IF Temp IS NOT NULL THEN
SELECT CONCAT_WS(',',sec, 0, quid, Temp) into result;
ELSE
SELECT CONCAT_WS(',',sec, 0, quid, 0 ) into result;
END IF;
RETURN result;
END;
The problem seems to be solved by using CHAR but I really want to have a
sequence of Integers as the result not CHAR. The reason that I dont use
a table to insert the result into it and retrieve it later is that this
process takes more time that It should. Any thoughts?
Actually, that's not 'the problem' you are attempting to solve at all. That is
an attempt at a 'solution' to the problem.
If I stare very hard into my crystal ball and use all of my psychic-SQL-fu, all
I can tell is that you are attempting to build some kind of comma-separated
value. However, why you need this list and what it is trying to solve is beyond
me.
Please step back from the SQL end of things for a second and talk to us about
the actual problem you are trying to solve. Are you generating nuclear launch
codes? Are you indexing someone's genome? Are you trying to build a web page?
All of this SQL coding is designed to be a single step in some larger process.
If you share that larger purpose with us, we may be able to suggest a more
efficient approach than arrays to solve your larger problem.
Regards,
-- Shawn Green
MySQL Principal Technical Support Engineer
Oracle USA, Inc. - Hardware and Software, Engineered to Work Together.
Office: Blountville, TN
Re: Arrays
Thanks guys for the help. but my problem seems to stand unsolved. From: Johan De Meersman vegiv...@tuxera.be To: Halász Sándor h...@tbbs.net Cc: mysql@lists.mysql.com Sent: Friday, August 26, 2011 7:04 PM Subject: Re: Arrays - Original Message - From: Halász Sándor h...@tbbs.net Hi, I would like to create a function in Mysql that returns an Array of Numbers. I am trying to run a big amount of stream of data on Mysql and I can't afford the time to store the data into a table and retrieve it later. Are there any arrays at all in MySQL? Arrays; no. Functions can return simple numeric/string values; I'm not sure wether or not you can return a recordset from a stored procedure. -- Bier met grenadyn Is als mosterd by den wyn Sy die't drinkt, is eene kwezel Hy die't drinkt, is ras een ezel -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=javadbakh...@yahoo.com
Arrays
Hi, I would like to create a function in Mysql that returns an Array of Numbers. I am trying to run a big amount of stream of data on Mysql and I can't afford the time to store the data into a table and retrieve it later. Is there any solutions? Best regards, Javad Bakhshi, Computer Science M.Sc Department of IT, Uppsala University
