Tracking Forums, Newsgroups, Maling Lists
Home Scripts Tutorials Tracker Forums
  Advanced Search
  HOME    TRACKER    MYSQL


SuperbHosting.net have generously sponsored dedicated servers to ensure a reliable and scalable dedicated hosting solution for BigResource.com.





What Are Connections And How To Manage Them


I have been using mySQL for several years now, but I currently developing a larger/broader usage website with intense mySQL contents usage.

I have been told that mySQL has a so-called connection limit of 50-70.

QUESTIONS:

1) What is a connection limit? Or... How do you count 1 connection?

2) How do you properly manage this, to e.g. handle a site that has 1000 simultaneous users logged in to a web site and interacting with the database.




View Complete Forum Thread with Replies

Related Forum Messages:
Manage Sql Queries
i've been using ms sql for many development and one of the many ways to manage sql queries would be to stored them as stored procedures. since mysql does nothave this feature in its stable release, does anyone have any good ways or good practices to stored sql quaries to allow easy maintenance? i plan to stored it as class files and call the function which returns the mysql quaries.

View Replies !
Install And Manage MySQL
I will have to follow-up my company mySQL server. I want to understand more about mySQL,
I would like to know if mySQL server can be installed through internet/web like myphpadmin? Or it must be installed locally?

View Replies !
Manage MySQL Instances
I am using the version 4.1.12a
Windows XP

In one customer I found the same version as mine and the ini file has

[mysqld]

port=3306

server-id = 1

basedir="C:/MySQL/"

datadir="C:/MySQL/Data/"

and the service is mysqld-nt

the question

I want to have the same service (mysqld-nt)
But different directory of my data

datadir="C:/MyData/Data/"

How can I do it in the configuration file??

View Replies !
PhpMyAdmin :: Manage Remote Databases?
Can phpMyAdmin be used to manage databases that are not local?

View Replies !
Windows Based GUI To Manage Tables
What is best GUI to utilize to connect to my db to make edits to tables, etc...?

I thought MYSQL Administrator could do it but I can't connect to my database on a shared server... if this is to the right tool.

View Replies !
Manage And Copy Data Between Two Tables
I have two tables:

Code:
TableA
referid allthreads
empy 1663
empy 1662
empy 8754
empy 8555
empy 8701

----
TableB
article_id thread_id
10664 1663
10630 1662
1655 1661
10641 1655
10622 1654

I need to copy all the "article_id" entries from TableB into "referid" from TableA that are related between thread_id (TableB) and allthreads (TableA).

So far, my best query, which gives me an error, and probably really wrong, is:

Code:
INSERT INTO TableA(
referid
)
SELECT article_id
FROM TableB
WHERE (SELECT allthreads FROM TableA) = ANY (SELECT thread_id FROM TableB)

View Replies !
MAXDB Not Allow To Create More Than 5 Instance On Database Manage
I have several problems with my MAXDB, I´m New user. The problem appears when I try to create more than 5 instance on DATABASE MANAGER, it close all conections and shut down all database, i have install it on LINUX DEBIAN 1.3 with MAXDB 7.5.

In addition to this, when I send more than 500 Mb. of data to my server it closes all connetions..

View Replies !
Database Design: How Best To Manage Data Across Multiple Schemas / Databases
Our organization is looking for the best design for managing shared data. Specifically we wish to have a master table for data related to a Person. That person table would be shared by any other databases within the company that needed it. Of course, we do not want to share the whole master table, just the rows relevant to specific application that will be using it.

We also want the sharing to be as transparent as possible to both the users and the support / development staff. Using a view seems like the way to go, BUT...each application has tables with FKs to the Person table. We can't do FKs to a view. We can have the application reference the view for selects / updates to the Person table, and have the other tables define their FKs to the master Person table, but we're a little worried about security since we can't narrow their permissions to only certain columns & rows like in the view. Oh, I am not doing a good job of explaining this.

View Replies !
Step By Step Approach To Manage Dual-master Set Up
I am thinking of having a dual master setup where two database servers
A and B are slaves to each other.

Could someone please point me to some documentation that details what
exactly I should do if A or B goes down?

View Replies !
How Do You Manage Changes From Development Server To Production Server?
What started out as a simple test of mysql has turned into what is
quickly becoming a replacement for our entire business system and web
site

The bad news is that we are now wrestling with how to we continue
working on development the system without risking down time for users.
If we work on a development server, how can we log the changes to table
structure and then apply them to the live database on the production
server when we are done testing?

Is there some sort of tool or log that would just let us apply table
structure changes to another copy of the database?

View Replies !
Allow Outside Connections
i need to be able to connect from one server to another... i need to know how to allow outside connections.
so i can use blah.com as the host instead of localhost
or is this turned on by defult in MySQL??

View Replies !
20 Connections
Is it normal for mysql's performance to plummet when it hits about 20 connections? These connections are all from scripts running as cron jobs.

I have max_connections set to 500 and max_user_connections set to 35.

View Replies !
How Many New Connections
How many connections Mysql cal handle

max_connections= ?

View Replies !
Too-many Connections
i am using MYSQL database in my system.i have public IP like (202.***.**.**)ie accessed
10 people in my organization.after some time it is showing too-many connections.

actually that is used only 10 persons but in my.ini file max_connections=255 are
255 but it is showing always too-many connections error.at that time we are restarting the system the problem is tempararyly solved?
what is the permenat solutions for that?

by using showprocesslist; command showing the list it is showing 10 users why it is showing the too-many connections?

View Replies !
Max Connections
I have stupidly set the max questions/conections options to such a low number that its locked me out before i even got a chance to play with this new version. Is there any way i can reset all the options and just start again. I have tried uninstalling and deleting the service from windows but on reinstall it just gives the same errors.

View Replies !
Too Many Connections
I am using Joomla 1.0.x and have ISPconfig Installed on my vps server. However since past few days I get the following message when accessing phpmyadmin
phpMyAdmin - Error

#1040 - Too many connections
and on the homepage I get
Joomla! Logo
Site-Name

This site is mysqlorarily unavailable.Please notify the System Administrator Could not connect to the database server. Previously every thing was fine suddenly this happened what can be done?

View Replies !
Solutions For More Connections To Db
I'd liek to ask what are the soultions when there are a lot of
connections to the db ??
For examlpe in how are builidng the db for mmo web browser based games.

View Replies !
Get The Number Of Connections
Is it possible to determine number of connections to a particular
database in MySQL? If yes..can anyone show me the way to do it in DML
or normal query form?

View Replies !
Too Many Connections Error
I have been getting the following error consistently every few days:

Warning: Too many connections in /path/to/connection.php

I altered the max_connections in my.cnf to allow for 300 connections. I
am not using persistent connections with php. I used to use them but
got this too many connections error all the time, so I switched to
non-persistent connections, but they don't seem to be getting killed
off? I am using php to connect.

has anyone else dealt with this issue? Should I perhaps be closing the
mysql_connect() after running each query?

View Replies !
MAX OPEN CONNECTIONS
My site has available by default 15 connections to MYSQL. Many connections remain open for much time, so when a new user enter the page it shows a message UNABLE TO CONNECT TO DB. How do I avoid this, without need change the number of connections of the server?

View Replies !
Network Connections
I can connect to the database on my FreeBSD system, but not from another
system on my network. How do I set it up to allow remote connections?

View Replies !
Dual Connections
I am developing a PHP script that needs to connect to two different databases in one script. There is one catch, however. One database is on a local computer (laptop). The other database is on a server 1,000 miles away.Is this possible?
In case you are wondering why I need this capability:

This application allows a user to enter data into a database on their local computer (laptop). With the click of a button, I want to transfer all of the data from the local database to the database on the server. Therefore I need to connect to the local database, loop through each record, copy it into an array. Then I need to connect to the server database, loop through the array, and insert each row into the server database. This must all be in the same script.

View Replies !
Persistant Connections
when installing oscommerce i noticed that it had an option - enable persistant database connections. How does this differ to 'normal' connections, and how would this be implemented?

View Replies !
'Too Many Connections' Error;
I manage a Linux box that runs a small website and today, my clients got the 'Could not connect: Too many connections' error when they tried to connect to their CMS. Here is what I did:

1. Ran "show full processlist" from a mysql prompt and got the following info:

+-----+------+-----------+------+---------+------+-------+-----------------------+
| Id | User | Host | db | Command | Time | State | Info |
+-----+------+-----------+------+---------+------+-------+-----------------------+
| 405 | root | localhost | NULL | Query | 0 | NULL | show full processlist |
+-----+------+-----------+------+---------+------+-------+-----------------------+
1 row in set (0.00 sec)

In other words, there was only one person logged on, and that was me. I ran this a bunch of times during the day and this was all I ever saw.

View Replies !
How Many Connections Are Open?
We have a large database that has suddenly become extremely slow. It is running on Fedora core 4. How can I find ou thow many connection are open?

When I look at CPU usage thru CPanel this appears to use a lot of CPU, sometimes over 90%

/usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/mail.realivent.com.pid --skip-external-locking

View Replies !
Connections And Timers.
Is it possible to establish connection with other DB ie ORACLE and execute select and insert the result to the MySQL DB. If yes how to do it ? Are there avilable tasks which can be fired on the timer basis ?

View Replies !
Selecting Across Connections
This is either a very simple answer or a very dumb question, i'm also sure there is alot of documentation on how/why not to do this possibly too much hence my issue with figuring it out.

I have a db on-site at locationA.
I have a db hosted online at locationB.

I want to schedule a query to run regularly (twice daily) that Selects into a table on db at locationB data from tables at locationA, the query needs to be executed at locationA.
I.e.

SELECT locationA.myonsitedb.tblMyTable.*
INTO locationB.myonlinedb.tblMyRemoteTable.*

Unfortunately, in my noobness I have no idea where to start here, I have no problem with the queries but I'm completely green to the setup of connections and how to query across these connections or how to setup the scheduling.

View Replies !
Aborted Connections
I get pages error logs with this message -
"Got an error reading communication packets". And the aborted clients are easily in hundreds.

Here is my set of configurations:
I am running Microsoft .Net 2.0 on Windows 2003 Server using IIS 6.0. I am using Mysql 5.0 with Mysql/.Net Connector 1.0.

Some of the settings on my.ini -
Connection timeout - 180
Wait timeout - 360
Max packet size - 10 M
Max connections - 5000 (pretty high, but set to be on a safer side)

When a perform a netstat -ao - I have lot many sockets open with TIME_WAIT status. On the MySql Command client - the Aborted clients average around 100's

The connection string from ,Net application has pooling=false with no help.

The webserver does not have a heavy load and has less than 5 users at any point in time.

On the registry settings, I have the max ports > 60000 and the time_wait setting changed to 30.

My application is opens a connection, performs a query and closes the connection and this is the fashion followed for all DB operations.

View Replies !
Multiple Connections
While running under XP my app did perform many successfully db operations. But after a few thousand or so updates and reads in a tight loop, it would eventually crash. A sample trace is included in a prior posting. Code:

View Replies !
# Of Mysql Connections
I was wondering what you guys thought about this. How many mysql connections do you think is to many on a php page?

View Replies !
How Many Concurrent Connections
i build system and deployed it on sun appplication server so i need to know how many concurrent connection to mysql database?

View Replies !
ODBC CONNECTIONS
We are in the process of setting up a database to house some information from our (legacy) ERP. Two questions have arisen:

1. Can we create a direct link to the data source from the db?

2. Currently we are using access as an intermediate connection - the link to the dsn in in access and then we have been exporting the data to the MySQL table. However, this will not let us update the tables it creates because it says the file already exists. If we stay with this method, how do we update the tables on a nightly basis (needs to be an automatic function).

View Replies !
Slow Connections
I am using MyODBC-3.51.11-2-win on Win 2003 OS. I am not able to see all of the connections in the list under the System DSN tab. The connections that show allow the ASP pages to run at an expected rate.

However, the ones not showing in the list are running extremely slow. If I attpemt to recreate the connection I am told that the connection already exists and asks if I want to replace the existing connection. Wheter I click yes or no the connections do not show and the pages run slowly. How do I get them to show or resolve the issue. The ASP code is the exact same SQL statements and connection strings as the in previous applications.

View Replies !
No. Of Connections Open
I am using mysql 4.0.12 with asp.net 1.1...

I want to find no. of connections open for a given database using any query...

Do anyone has any idea?

View Replies !
Getting Active Connections
i wanna get active user connections, means which users are connected to server.
i have seen it in mysql administrator software in server connections tab.

View Replies !
Database Connections
i have a general question using the mySQL database.
Lets say I have 10 database queries in my application. The 10 queries do not happen one after the other in a short time, so it can be that between one and the next query elapse seconds, or minutes, depending on e.g. user actions of my application.
Well, should I open and close a connection for every query or should I open one connection in the beginning of my apllication, then do the ten queries with the same connection and afterwards close the connection again?
I think both is possible, but what is 'best practice'?
Is it a matter of speed from/to the database

View Replies !
Too Many Connections By A Php File
I have been using a certain php file to connect to a mysql database for some time, but the last time that I checked it for bugs, I got an error message "Warning: mysql_connect(): Too many connections in /home/yonni/public_html/cgi-bin/register.php on line 19. ERROR 3: The connection to the registration database is temporarily unavaliable: Too many connections" I have not changed the coding for the connection to the database since I first wrote it. The code for this part of the script is:

$dbh=mysql_connect("localhost", "*my username*", "*my password*") or die ('ERROR 3: The connection to the registration database is temporarily unavaliable: '.mysql_error());
mysql_select_db("yonni_") or die ('ERROR 4: unable to select the correct database');

Why has this error occured, and is there a way of avoiding it? There is noone else viewing the site yet, and I do not know what the problem is. Please help

View Replies !
Too Many Faulty Connections [ Was Please Help ]
My website keeps telling me 'Cannot connect to dababase, too many fauly connections'

I saw that we can do this:

shell> mysqld_safe -O max_connect_errors=10000 &

But I don't run Linux, and thus can't do a shell command.

Does anyone know how to do this in windows server 2003?

View Replies !
Question About Max Connections
I had a question about maximum connections to a database. How does that work? I've read different things about it. If I have a limit of 100 connections and 100 people are currently connected to the database, then 1 more can't...

or

Is it only during connecting that this issue comes around.

View Replies !
Too Many Connections (my.cnf Set To 3550)
I'm getting the following error in one of my scripts:

Warning: mysql_pconnect(): Too many connections in /home/filexoom/public_html/includes/mysql.class.php on line 5
mySQL: Too many connections on line 5 in /home/filexoom/public_html/includes/mysql.class.php

To fix the problem I've raised the max_connections to 3550 (had to raise it gradually), but it is still getting the error on occasion. I don't understand what's going on, I only have about 4000 users in the db. I have restarted httpd, mysql, and even the entire server after editting my.cnf. However I'm still getting the same issue.

I'm thinking perhaps the script is not closing the db connections, so there are a bunch that are still open, but should be closed. If so, is there anyway I can kill/flush all the current connections?


View Replies !
How Many Active Connections?
i need to know how many connections and where they are coming from becuase my database is taking over the whole cpu after around 20 minutes the deamon has been started. it's very xtrange and i don't know how to work this out

i taught it was a windows problem but it's the same over linux

View Replies !
Closing MySQL Connections
Here's a question for you, my hosts have told me that that one my pages,
php, was causing their server to reboot because there were too many open
connections and that they should be closed.

Now, correct me if I am wrong but I thought that the connections were closed
after a minute of inactivity.

Does this sound right? Could open connections cause their server to reboot a
lot, say 3 times in 15 minutes? If so, what can I do about it?

View Replies !
C API Secure Client Connections
Any idea where can I get a copy of the libmysql dll with ssl enabled?

View Replies !
Mysql_pconnect() Do Persistent Connections Ever Die
I currently connect to my db with PHP code that uses non-persistent
connections. I've read that persistent connections can help performance
since a connection to the db will use an existing unused connection.

If my system was to go through a busy period whereby I seen an extra 50% or
more activity for ten minutes or so, would the extra connections stay alive
for ever or is there a time limit of inactivity?

Would the unused connections just sleep if they don't die? Is there any
negative effect of having these connections waiting around?

View Replies !
Mysql_pconnect() Do Persistent Connections Ever Die?
I currently connect to my db with PHP code that uses non-persistent
connections. I've read that persistent connections can help performance
since a connection to the db will use an existing unused connection.

If my system was to go through a busy period whereby I seen an extra 50% or
more activity for ten minutes or so, would the extra connections stay alive
for ever or is there a time limit of inactivity?

Would the unused connections just sleep if they don't die? Is there any
negative effect of having these connections waiting around?

View Replies !
InnoDB And Lost Connections
I have just recreated several (large) tables in the database as InnoDB and
reloaded them using my client application... These tables used to be MyISAM.

I haven't tried playing with any InnoDB parameters, right now everything is
default. Some operations a noticeably slower, which can probably be fixed.
Speed is not essential right now. But I did run into one strange problem
with a batch INSERT SELECT that would take about an hour with MyISAM. With
InnoDB, if everything would work right, I would expect the query to take
longer to execute. In fact, it gets aborted in about 30 minutes with the
error 2013 -- lost connection during query. Something obviously related
happens if I run it through JDBC -- then I get an exception with a message
"unexpected end of input stream" also in about 30 minutes after the
statement is submitted.

I cannot not ALTER the table in question back to MyISAM for the same
reason -- lost connection before the statement gets executed.

I'm running MySQL 4.0.16 on Red Hat Linux (don't remember the version, but
it's a fairly recent production release) with 1G of RAM.

View Replies !

Copyright © 2005-08 www.BigResource.com, All rights reserved