MYSQL :: How Many Connection Can A MySql Database Handle Per Second.

How Database Handle Request?
I want to write a program that can access to multiple database based on the user ID, but I dont know how the database handle user request. Please help me...

if user A execute program and redirect to database abc, and user B also accessing it. user A retrieve value from database but not yet update it, at the same time user B go get the value. How can I control it? can I code a program that control if A not yet finish, we cannot allowed user B to retrieve the value?

I cannot use Java synchronization. if I use it, it will synchronize for all the request although the request is redirect to different database(I am using many databases but sharing 1 program). There is no point to do synchronization if another user accessing other database that is no user at that moment but still need to wait user at different database finish their tasks first.

How To Handle Line Breaks When Storing Textarea Entry In A Database?
I want to save textarea contents to a mysql database with the
paragraph breaks intact without having to type paragraph or break tags
in HTML. How can I do that. So far, although it occurs naturally when
I save the contents to a file, it doesn't break up the paragraphs
properly when I save it to my database.

Connection To MYSQL Database
I am new to the forum and have little experience of using MYSQL, PHP and Apache.

I am wanting to create a database or try to get the example of the "Pet Shop Catalogue" in the PHP and MYSQL dummies book to work first before I try developing my own database. Each time it comes up with an error of "Cannot connect to the database." I have entered the SQL for the example in the program given in the book, made sure that PHP is working and Apache Web page is up and running and MYSQL server is running in the back ground.

Also I tried to enter the SQL directly into the server but to no avail. Below shows the status of the MYSQL server.

mysql Ver 11.18 Distrib 3.23.52 for pc-linux -gnu (i686)
connection id 1
current database
current user root@localhost
current pager stdout
using outfile ' '
server version 3.23.52
protocol version 10
connection Localhost via UNIX socket
client characterset latin1
server characterset latin1
Unix socket /var/lib/mysql/mysql.sock

Threads 1 Questions 2 Slow Queries 0 Opens 6 Flush Tables 1 Open Tables 0 Queries per second avg 0.009

Can't MySQL Handle Images
I would like to include images in MySQL database to advertise for my products. Is this possible? ... but it must be! I see it used on the Internet all the time. How can I include images in the database?

MySQL Handle Arabic
I am trying to load Arabic characters into a MySQL table, and it doesn't appear to be working. The database is in XML format. When I look at the file using an XML viewer, the Arabic characters are there. I then use Navicat to import the XML file into MySQL. When I look at the file with MySQL query browser, there are question marks where the arabic chars should be. If I export the MySQL table to Excel (which I know can display Arabic chars) ther are still just question marks, so somehow I am losing the chars in the conversion.

Mysql Database Connection - How To Make Connectin?
i have two website . both hosted on diff. server

now what i need is to connect second website database from first website
***
detail
***
when user register on first website a insert query should also make on second website database.
can you tell me how can i write my conenction string:

server1:rs397.secureserver.com (database: abc) , website 1: www.example1.com
server2:rs455.secureserver.com (database: 3214), website 2: www.example2.com

waiting for any one urgent reply
vr4indian@yahoo.com is my email id or you can also reply on this message

Remote Connection To Mysql Database Using JDBC?
I am trying to set up OpenOffice Base to connect to a remote os x server with mysql on it.

It has the default mySQL JDBC driver class set to com.mysql.jdbc.Driver

It also asks for server URL, should this be the ip address?
Port number? Default is set to 3306.

When I set the class it says that the JDBC driver could not be loaded.

How Do I Select A Database In A Mysql Connection Script?
How can i do this in one line of code?

I know that there is:

$con = mysql_connect("localhost","user","pass");
if (!$con)
{
die('Could not connect: ' . mysql_error());
}

but I was unable to select a database using:

mysql_select_db("db", $con);

Any ideas?

How Many Rows Can Mysql Handle, How Much Text Can Fit
How many rows and columns can mysql support? does it vary depending on amount of info in each row/column?

also, how much text (characters) can fit in a text field?

and lastly, i have a list of rows and need to display based on most recent date (sorting further by time if multiple entries on same date)...

i have this to sort by a column by a-z or z-a:

"select forms from formList where formID = '' order by formName desc"

How Can I Handle The Referential Integrity Y MySQL Tables?
How can I handle the Referential Integrity y MySQL tables?

Would MySQL Handle Millions Of Records Tables
I already found on the MySQL web site that some users did have good
results with tables of some millions records.

But, what I want to do is store some hundreds millions records in a
table. 190 millions to start and maybe a lot more after. Does someone
already use MySQL with such a quantity of data ?

I was also asking myself how a simple SELECt query like this one below
would perform on such a table.

SELECT * FROM MyTable WHERE MyPrimaryKeyField = Value;

I think that with indexes this shoudl be fast despite the fact that
the table is huge.

An other kind of query i'd like to do is :

SELECT Count(*) FROM MyTable WHERE ABooleanField = True;

I expect this one to take several minutes, maybe hours. Is my guess
right or could it be lot faster/slower ?

Mysql Version Is More Able To Handle Heavy Traffic
we are currently running mysql 4.1. we have problems with a php/mysql website that generates a lot of traffic and relies heavily on mysql (it's a "find your old schoolmates" community website).
Sometimes it just says "too many connections", or just takes a long while before rendering the page.

Would upgrading to mysql 5 help ? What are the best mysql settings in order to optimize the performance?

SQL Execution Error # 2013. Response From Database: Lost Connection To MySQL Server
I'm upgrading to v4.1 from v3.2 on a Windows XP box; I did an uninstall on the previous version, but Windows services did not remove it as a service (v4.1 was logged as a new service, MySQL4).

I breezed through the install process, but I get an error when I try to launch the .exe file from the command line. It says ... "ERROR 2013 (HY000): Lost connection to MySQL server during query." MySQL4 is now an automatically started service under Windows and mysqld-nt is operating in the Task Manager as a process.

When I try to connect via MySQLFront, I get the following error message: "SQL execution error # 2013. Response from database: Lost connection to MySQL server during query."

Connection Do Database Using Psp
I use a hosting company for my websites. I have created a mysql dabase using my hosting company's control panel. Now, I am trying to figure how I connect to it to enter data.

Connection To Database
is the syntax the same as connecting to mssql using asp?? this is how i connect to mssql using asp:

Set Conn = Server.CreateObject("ADODB.Connection")
Set RS = SErver.CreateObject("ADODB.Recordset")
strConn = "DSN=FYP_Actual;Driver={SQL SERVER}; UID=sa;pwd=;"
Conn.Open strConn

is this the same way i connect to mySQL too?

Database Connection
I have setup a mySQL database for a PHP nuke forum.

The PHP seems to be able to read ok from the sql but not write. For example the page loads fine but creating a user or changing the layout doesnt work.

I am connecting using the root user so i would have thought all the permitions were correct but i have still checked everything i can.

I have looked at the windows permitions and the IIS permitions and everything is set correctly so far as i can tell.

Connection Database Problems
I'm having currently a problem when trying to connect to a database

First of all I have MySQL server installed in a remote server. When I connect to the DB from my Home using MySQL Administrator GUI Interface I connect fine without any problems. My problem comes in my ASP pages. I'm trying to make a connection with a db in mysql and I can't for some reason. Everything is fine (The RemoteAddress Port Number, UserName, Pwd, etc). If I run the exact same ASP file from the server where MySQL server is installed it works fine, the problem is when I run the ASP file in my PC from my home.

How Often Should Database Connection Be Closed?
I have a question regarding the frequent closing of database connection.

Will it be okay to leave the connection open, once the program starts running till it is closed after the application is quited? Or there should be frequent openings and closings of the database for each query?

Database Connection Failure!
I have uploaded the file to my server and edited the config file to reflect the database I created but when I attempt to access the file I receive the following error: "Database connection failure!".

I have done everything to get this basically simple script to run and I can't find out what the error is, including deleting the database, user, etc. Can anyone please point me in the right direction?

Remote Connection To Database
i have a web-hosted website and i need it to connect to my mysql database is there anyway i could set this up.

Database Connection Fails
I've been having problems with my CGI script, it overloads the
server. I think it's because the database connection fails because
the following error is logged whenever the server overloads.

DBI->connect(server=localhost;database=Employee) failed: at db.pm
line 53
db.cgi:: Could not connect to database
db.cgi:: No database connection exists
db.cgi:: No database connection exists

And I use these settings to run mysqld.

/usr/libexec/mysqld --defaults-file=/etc/my.cnf --basedir=/usr
--datadir=/var/lib/mysql --user=mysql
--pid-file=/var/run/mysqld/mysqld.pid --skip-locking

I read some documentation that skip-external-locking should be used
instead of skip-locking, but that seems like a minor thing. I'm not
entirely sure it is the database connections, I'm just trying to
eliminate possible causes.

ASP And Database Connection Question
I got the database open with the following code (which all works perfectly)....

// Build the sql statement
m_strSQL = "select * from <datatable> where Remote_IP Like '%" & Request.ServerVariables("REMOTE_ADDR") & "%';"
// Create the MySQL Connection.
set MySQLConn = server.createobject("adodb.connection")
// Open the Database
MySQLConn.open "DRIVER={MySQL ODBC 3.51 Driver};SERVER=<IP Address>;DATABASE=(Database Name>;USER=<User Name>;PASSWORD=<Password>;OPTION=3;"
// Open recordset
Set objRS = MySQLConn.Execute(m_strSQL)
//
If objRS.EOF Then Response.Redirect("ID_Survey.asp")
//
%>

Silly question is, having directed the browser to another page, (or stayed on this one depending on the "objRS.EOF" result) how do I close the Database and Connection?

Connection To Database Failed
Keep getting the error message when trying to connect to a MySQL database:

"Connection to Database failed
Host 'MYSERVER' is not allowed to connect to this MySQL server"

I can sucessfully create and view the database, I can sucessfully login to the MySQL Command Line Monitor AND the MySQL Administrator using the 'root' user so I know my password is good. I have given the IUSR_MYSERVER Internet Guest Account read, write & modinfy privelages to the database folders.

Database Connection Issues
ok here is the problem code
Code:

$db = mysql_connect("localhost", "grav1com_z3r0gr4", "****") or die("Could not connect.");
if(!$db)
die("no db");
if(!mysql_select_db("grav1com_bloghost",$db))
die("No database selected.");

ok when i try to use this script to connect to the database i get no databse selected which is infering that there is no database info in the mysql_select_db variable correct? then what is going on here? is there a slight error that i'm not seeing?

Database Server Connection
I am trying to using mysql as back-end for an application(web) running
on the window 2X, one thing I am not sure is that once I establish the
connection between database server and application, should I keep this
connection open while application is running, or only open it when
there is a requet to qury records from database?

How Do You Handle Birthdays In A Db?
I'd like to be able to gather a child's birthday and then use PHP to retrieve the birthdate from the db and automatically update the age as time goes by. What do I enter in the db and how do I do it?

Handle Use By Mysqld.exe
When I run MySQL, I notice that mysqld.exe uses > 40,000 handles (according to Windows Task Manager).Is this normal? what all these handles are used for?

Error Establishing A Database Connection
I'm trying to use MySQL on my computer to design and test a WordPress blog locally, but I keep getting the message, "Error establishing a database connection." This isn't limited to WordPress; if I run a simple MySQL test script I get the same problem.

I'm using MySQL 4.0.21 (I installed this old version after getting the same results with a couple of newer versions, so I don't think this is the problem). I'm on OS X 10.4.8.

Using MySQL Administrator, I'm able to connect to the server as root. I created my wordpress schema and assigned all available connection privileges to root on localhost, [computername].local, and %.

I'm used to creating a database and assigning a user to it using cPanel. I suspect the solution is simple and I'm overlooking something obvious because of my newbie status when it comes to MySQL.

How To Handle DHCP And Permissions
I am using an Access front-end, but the users are on machines set to DHCP. SO when the IP changes, they are denied access.

How To Handle Multilingual Content ?
I have a small cms and now there is the need to store foreign content (japanese/farsi) in the database. I use standard Tiger X-Serve with PHP5 and the preinstalled MySql.

And now I need a little help with the foreign language support. The things I did already:

1. I put Â»charset=utf-8Â« in the HTML meta tag.
2. I use phpMyAdmin and set the database language collation to Â»utf8_general_ciÂ«
3. I copy/paste a japanese text from apple.co.jp into my formular and tried to store it into my database.

But it seems that is not enough

Does anyone know how to solve my problem?

Handle Line Breaks
I want to save textarea contents to a mysql database with the
paragraph breaks intact without having to type paragraph or break tags
in HTML. How can I do that. So far, although it occurs naturally when
I save the contents to a file, it doesn't break up the paragraphs
properly when I save it to my database.

Handle Old Or Disabled Data
I have a table of profiles that users create (they can create more than one). At some point, they may want to delete that profile, however, we don't want to delete the data, we'd rather disable it. (the info will be important to us later down the line).
I'm not sure which is the better option:
A. add a status column to the 'profileList' table and when they want to "delete" the alert profile, I just set the status to: 0?
B. create a second table with the same structure called "profileList_Archive" and insert the disabled row into that table first then delete it from the live table?
Just wondering if all those disabled alerts in the same table as the active alerts will cause performance issues down the line. This table will be probably(hopefully) have grow very large over time.

Switching Assigned Database For An Established Connection
I am implementing a connection pool using the C API. In my pool, The first time a connection is made, I call mysql_init(&myConn), and then use this myConn connection structure to call mysql_real_connect() with the appropriate user name, password, and a database name to connect to. Once the connection is established, it is used for the current database query and then put back into the pool.

My question is regarding using multiple databases with a single connection pool. If I pop an established connection off the pool and the database it is currently assigned to does not match the requested database of the new query, what do I do?

Do I close the existing connection and create another with the new database name? If so, wouldn't this defeat the purpose of having sustained connections?

What I first tried was to simply call mysql_real_connect() again with the new database name. This worked, but using MySQLAdministrator to look at the list of open connections/threads, I see the original connection was not closed, and I no longer have a handle to it, so it is lost.

Here is some pseudo code:

Intermittently Losing Database Connection During Query
I am using mysql version 4 and java clients written as a windows desktop application using ConnectorJ. The server hardware is a Windows XP machine with service pack 2 running as a virtual server on a windows platform. There are a maximum of 10 concurrent users from the client XP platforms and versions of my program have run pretty well for a couple of years in a similar configuration.

On my current project the charts and reports that I produce keep crashing due to losing connection to the mysql server.

I use auto reconnect and have upped the number of tcp/ip connections on both the virtual server and the client pc. This seems to have helped but problems still arise.

What kind of issues can create this kind of problem? and what are the possible solutions?

How To Handle Duplicate Keys In Insert
I have the following table definition:

CREATE TABLE `suggested_synonyms` (
`Last_Name` varchar(255) NOT NULL,
`Synonym` varchar(255) NOT NULL,
PRIMARY KEY (`Last_Name`,`Synonym`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1;
The table stores mapping from a last name to a synonym.
I need to insert multiple rows into the table. Something like:

insert into suggested_synonyms (`Last_Name`,`Synonym`) values ('smith', 'smeeth'), ('smith', 'smeath');
the problem is that some of the mappings may already exist in the table.
I tried to use the ON DUPLICATE KEY UPDATE syntax to prevent duplicate entries, but apparently I am not doing it correctly:

insert into suggested_synonyms (`Last_Name`,`Synonym`) values ('smith', 'smeeth'), ('smith', 'smeath') ON DUPLICATE KEY UPDATE;
As I need to specify the columns to update.

Is there a way to insert multiple rows in a single query and still be safe from duplicate rows?

Handle No Data Found Situation
I am kind of new and am trying to set up error handlers in MySql
5.0.41.
I create a function. Within, I try to keep selecting until I get
nothing back from select.

I cannot seem to catch the error when the select returns nothing.
I declare a handler like this:
DECLARE CONTINUE HANDLER FOR NOT FOUND
BEGIN
SET tester = 01;
more stufff....
END;

DECLARE EXIT HANDLER FOR SQLWARNING
BEGIN
write out to error log...
END;

Then, I have a loop like this:

myloop: LOOP

select x INTO y
FROM z
WHERE a = b;

if tester = -1 then
LEAVE myloop;
end if;

do stuff here....

set b = b + 1;

END LOOP myloop;

The select is guarenteed to retrieve nothing after a few loops around.
but it never ends. The declare continue handler does not fire.

If I run from client command prompt the EXIT handler fires, but I
dont get the warning message, just message thatit exited without a
RETURN.

If I remove all error handlers and run form prompt, it runs endlessly
until I stop it with a counter var. Then I get X number of warnings,
but it doesnt say what the warning is

Handle Time Stamp With Milliseconds.
Right now I am working with PostGreSQL. Now I am planning to migrate to MySQL.I am having the field with data type 'TimeStamp' in PostGreSQL.Which stores the date , time along with the milliseconds.When I am trying to use same datatype in MySQL, Timestamp is not allowing to store milliseconds.Is there any alternative to solve this problem.

Proper Way To Handle Old Or Disabled Data?
I have a table of profiles that users create (they can create more than one). At some point, they may want to delete that profile, however, we don't want to delete the data, we'd rather disable it. (the info will be important to us later down the line).

I'm not sure which is the better option:

A. add a status column to the 'profileList' table and when they want to "delete" the alert profile, I just set the status to: 0?

B. create a second table with the same structure called "profileList_Archive" and insert the disabled row into that table first then delete it from the live table?

Just wondering if all those disabled alerts in the same table as the active alerts will cause performance issues down the line. This table will be probably(hopefully) have grow very large over time.

Handle User Credit Card
I'm setting up a site on a shared server that allows users to buy a single product with their credit card. SSL will be used for encrypting the data sent between server and browser, but my question is what to do with the credit card details once they're sent to the server.

Storing them in a database isn't ideal from a security point of view. But the details have to be stored somewhere (for a short time at least) as the site will not be availing of any credit card authentication services when the transaction occurs. The company has their own credit card machine in the office which they manually use to complete the purchase, so they need to be able to reference the card details.
So what are my options? Some form of encryption?

Handle Replacing ' In Data Already Input
I have recently been given a project that belonged to another programmer.
The issue I'm having is that no data validation was put in place of the program and so now I have data that has characters that are not allowed by MySQL, specifically apostrophes.
I now how to do it in PHP to replace the character, but what I need to do now is to replace the data already in the table. I'm specifically talking about a user's login name.
Can I escape it inside the database and not have the user's login name change?
For example I have a username that is O'LearyDM.
I haven't been able to comb through all the code to figure out just how the original programmer was able to even allow insertion of apostrophes, but now I need to fix it.

Handle Duplicate Log Entries (but With Differnet Timestamp)
I am logging page views into a table. In some cases there may be many entries that all have the same values across the board, except for the timestamp. I would like to be able to remove the duplicate rows, or consolidate the dupicates. I haven't found any specific tool to do this. What would be the most efficient way of doing this? As an example, if a the home page is viewed by the same person 5 times in a day, or an hour, I'd like to only end up with one entry.

Changes Made In One Connection Does Not Reveal In Another Connection At Once.
I use many connection and the same as many threads in my server app to gain performance on a multicpu machine.

Firstlly i call "set autocommit=0" and wrap every statements with "start transaction " and "commit". i use mysql_stmt_execute for every statement rather than mysql_real_execute except those that can't be prepared. The version of mysql is 4.1.11 under Debian linux.

In one connection of one THREAD i insert a row into a table. After i got the sucess code and the last insert id, i then do a "select" from another connection in another THREAD with the "last insert id" return by the previous insert . I expect the select can fetch the row that i have just insert , but some time it does and some time it doesn't.

is there any funtion like "mysql_....flush...cache.." to make the changes from one connection to be reveal to the global at once?

MySQL Error 2013: Lost Connection To MySQL Server During Query
I'm running sugarcrm on mysql and the following query is returning "MySQL error 2013: Lost connection to MySQL server during query":

MYsql Connection/PHP
I am getting the following message, when I installed mysql client version 5.1.11. I get this message when I tried to connect through PHP. I am using, windows XP professional.

"Client does not support authentication protocol requested by server; consider upgrading MySQL client"

Connection To MySQL Using .net
I am trying to connect to a MySQL database, using the .Net framework.

I installed the newest MyODCB (3.51) and the .Net ODBC drivers from
Microsoft.

I made a System DSN using the driver, and i get it to connect - so far
so good.

But if i try making a new connection i my code using the sample
connectionstring from MySQL, i get an Exception :(

"An OLE DB Provider was not specified in the ConnectionString. An
example would be, 'Provider=SQLOLEDB;'."

What i try is:

Return New OleDb.OleDbCommand("DRIVER={MySQL ODBC 3.51
Driver};SERVER=localhost;DATABASE=bigshop;UID=root ;PASSWORD=;OPTION=3;")

PHP Connection To MySQL
I'm working on a simple script to create two tables within a database, and I'm sure its just some stupid error I'm making, but I cannot seem to get it to work! Here's my function: Code:

MySQL-PHP Connection
the problem i'm facing is of mySQL-PHP connection. i'm trying ...

<?
$link = mysql_connect("localhost",'root','nawal')or die("Connect Error: ".mysql_error());
print "Successfully connected.
";
mysql_close($link);
?>

and getting this message...

Warning: mysql_connect(): Client does not support authentication protocol requested by server; consider upgrading MySQL client in C:Program FilesApache GroupApache2htdocs estindex.php on line 5

Connect Error: Client does not support authentication protocol requested by server; consider upgrading MySQL client.

MySQL Connection Over LAN.
I have installed mySQL server on a computer (ServerName: AHMED, ip:192.162.0.1) and teh server listens at port:3306.

I type "mysql -u root -p" on command line to connect to the server on local host.

Now I want to connect to the same server over the network from a computer (ComputerName: FARAZ, ip: 192.168.0.2). I Copied mysql.exe to the client PC (FARAZ) and I typed the line "mysql AHMED -u root -p" on FARAZ (Client PC) but It says that it fails to find any mySQL sever on AHMED.

1] If I only have to copy mysql.exe on the client to access mySQL server over a network.
2] Am I right to type "mysql AHMED -u root -p" on the client to connect to the mySQL server?