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Replication With Multiple Servers In Mysql ?


I want to establish replication between multiple (currently three) servers.
Updates/inserts/deletes may happen on all of them. The idea I came up with
was to do a "circle"-replication. The problem with this is, that if one
server fails the rest may not get updates (until the server is back,
obviously).

Does anybody have an idea how to establish such a replication in a fail-save
manner ? Code:




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Replication With Multiple Servers In Mysql
I want to establish replication between multiple (currently three) servers.
Updates/inserts/deletes may happen on all of them. The idea I came up with
was to do a "circle"-replication. The problem with this is, that if one
server fails the rest may not get updates (until the server is back,
obviously).Does anybody have an idea how to establish such a replication in a fail-save
manner?

Replication With Multiple Servers In Mysql
I want to establish replication between multiple (currently three) servers.
Updates/inserts/deletes may happen on all of them. The idea I came up with
was to do a "circle"-replication. The problem with this is, that if one
server fails the rest may not get updates (until the server is back,
obviously).
Does anybody have an idea how to establish such a replication in a fail-save
manner?

Multiple MySQL Servers
If you need multiple MySQL servers running, what's the difference between installing MySQL once and running multiple servers (by issuing multiple mysqld commands with their own options), versus actually installing two or more DIFFERENT instances of the same version of MySQL?

What is typically done? What are the advantages/disadvantages of either method?

Multiple MySql Servers
Trying to install MySql 4.1 to our Linux server that already has
version 4 installed. I created a my.cnf file and set the following
params:

datadir = /usr/local/mysql-4.1/data/
port = 3304
socket = /var/run/mysql4.1/mysql4.1.sock
pid-file = /var/run/mysql4.1/mysql4.1.pid
log = /var/log/mysql4/mysql4.1.log


The current installation is running from a different port and the data
dir, socket, pid-file, and log are in different locations.

I then attempt to start MySQL like this:

../mysqld_safe --defaults_file=/path/to/my.cnf --user=mysql &

I get the following error:

/var/run/mysqld/mysqld.pid: Permission denied
rm: cannot unlink `/var/run/mysqld/mysqld.pid': Permission denied
Fatal error: Can't remove the pid file: /var/run/mysqld/mysqld.pid
../mysqld_safe: /var/log/mysqld.log: Permission denied
Please remove it manually and start ./mysqld_safe again
mysqld daemon not started

It's as if it is ignoring the "--defaults_file" parameter and using the
same my.cnf file that the previous installation has.

Multiple Mysql Servers On Linux RedHat
I am trying to figure out how to install 2 different versions of MySQL, 4.x and 5.x on a Redhat 3 server.

Connect/ Join Query Multiple Dbs Multiple Servers
Struggling to connect simultaneously to remotehost@my_ip_address
AND localhost@my_field_db FROM my_field_tablet_pc to affect
a custom sycnchronization that SQLyog will not allow.

Both remotehost and localhost are built on WAMP stacks.

Multiple Servers
How do I configure my phpmysadmin to administer mysql databases on multiple servers?

Multiple Servers On The Same Host
Well i want to run multiple servers on the same host, has somebody a Howto for this?
Code:

MySQL Replication (Multiple Master & 1 Slave)
Is it possible to replicate 2 or more master server & 1 slave server?

I have tried 1 master & multiple slave running but I want to try 4 master server & 1 slave server. Is this possible?

Multiple Servers On A Single Host Question
I have a single instance of MySQL package installed on FreeBSD. I run 2
servers. The second server is run with this command:

shell> mysqld_safe --defaults-extra-file=/root/my2.cnf &

some /root/my2.cnf file entries:
port = 3307
socket = /tmp/mysql2.sock

Both servers co-exist peacefully except:

shell> mysql --socket=/tmp/mysql2.sock [accesses second server
happily]

***BUT***

shell> mysql --port=3307 [accesses the first server and not the
second!!]

Does that mean that the first server's port 3306 is hard-coded into
MySQL ?

Is this a bug ?

Or am I missing something ?

2 Mysql Servers
I have a Mysql server lets call it "Production", but also do lots of development when traveling (offline) on my laptop, where i also have mysql instance installed + php + apache .... both MySql are 5 and same build running on windows.

What would be the best way to "replicate" Mysql from my laptop to the server when I get connected. One way solution (from Laptop to Server) would be great, but both ways (whichever is newer gets replicated would be excellent). thought about replication but i undertood that the master 'version' will always be writen to slave.

We need to consider any kind of changes, table changes, dbs change, users, data, etc...

Hope you can give me a light, it is not a large amount of data, and i would not mind a very manual process, as long i can script it or if it is a few steps only.

Two MySql Servers, One Database
I have two MySql servers, one in my local PC and one as a testing server in the next room. Using DW 2004 I can use the "put" and "get" to get my PHP files from one PC to the next quicky. How can i do that with the two MySql servers? So if I change the Structure of a table or and data to the Mysql database on my local PC, it will send the changes to the testing server.

Consolidating MySQL Servers
My organization currently has 2 different MySQL database servers. We
are in the process of moving the databases from Server A to Server B
and have Server B be our primary database server. I've done some
research on the web and believe the best option is to use the
"mysqldump" command to remotely recreate Server A's databases on to
Server B.

Can anyone please advise whether this is the best option? Also, using
the "mysqldump" command, are there any overwrite issues, such as
existing tables on Server B being overwritten by tables with the same
names from Server A. Would these tables be simply overwritten or
would there be any type of warning prompt?

MySQL Databases And 2 Servers?
We are planning to reprogramm our search machine and website. Since we
have call agents who query the same database as the customers do, we
had the idea of splitting the database to 2 servers.

The call agents can update customer data with our intern webinterface,
which not only concerns tables that are for the call agents, but also
concerns tables of the search machine, holding company data such as
address, search words, etc.

O.k., now my questions. Since the customer himself can administer his
own data, as well as the call agent (or media agent), I was thinking
of doing following:
* I have 2 servers. Server 1 is responsible for the search machine and
just serves customers searching for a company or for products. The
MySQL database is there just for querying.
* Server 2 serves call agents, as well customers who want to change
their data, reading and writing.
* Since the search machine should of course show updated data the call
agent or the customer have eventually changed, the data from server 2
must be synchronized with the MySQL databese of server 1. (e.g. at
midnight)

Questions:
-------------
0. Is the above described the right way?
1. What do I have to consider when planning the database structure?
2. How do I synchronize? Can I copy specific tables from one server to
another using cronjobs (crontables)? Since this is absolute newland to
me, how?

Any expert knowledge or experience with MySQL replication or MySQL
clusters? I think replication is just thought for mirroring, or am I
mistaken?

MySQL Databases And 2 Servers?
We are planning to reprogramm our search machine and website. Since we
have call agents who query the same database as the customers do, we
had the idea of splitting the database to 2 servers.

The call agents can update customer data with our intern webinterface,
which not only concerns tables that are for the call agents, but also
concerns tables of the search machine, holding company data such as
address, search words, etc.

O.k., now my questions. Since the customer himself can administer his
own data, as well as the call agent (or media agent), I was thinking
of doing following:

* I have 2 servers. Server 1 is responsible for the search machine and
just serves customers searching for a company or for products. The
MySQL database is there just for querying.
* Server 2 serves call agents, as well customers who want to change
their data, reading and writing.
* Since the search machine should of course show updated data the call
agent or the customer have eventually changed, the data from server 2
must be synchronized with the MySQL databese of server 1. (e.g. at
midnight)

Questions:
-------------
0. Is the above described the right way?
1. What do I have to consider when planning the database structure?
2. How do I synchronize? Can I copy specific tables from one server to
another using cronjobs (crontables)? Since this is absolute newland to
me, how?

Any expert knowledge or experience with MySQL replication or MySQL
clusters? I think replication is just thought for mirroring, or am I
mistaken?

Mysql On Windows Servers
Will mysql work with microsoft server products? Does it lose any funtionality? Would it be better to use mssql?

MySQL And Free Web Servers
can you use MySql on web Servers like
Freewebs.com,Yahoo!geocities, aol home town ans sites like that.

One (phisical) DB And 2 MySQL Servers
Is it possible, that couple of MySQL servers wcan work simultaniously with one (phisical) DB?
My task is following:
I have to computers and thay both have one (and the same)å SCIS Raid harddisk.
This all together shall be a MySQL Server.
have can MySQL be installed so, that DB will be placed in one pace (SCIS Raid), and MySQL works simultaneously on both computers.
what concerns MySQL Cluster, as much as i've understood it is designed to store one DB in different places - distributed by cluster nodes. It is too much for me, isn't it

MySQL Percentages And Use Indexes On Servers
Working on a MySQL based project: ¿where can i find charts of utilization, percentages of servers using MySQL, comparison charts, etc.? Two days on Google, but nothing.

Apache & MySQL In Differentes Servers.
I've been running a slow Debian machine, with Apache + PHP + MySQL. But, with the time and usage, it's getting to slow to use MySQL. So, now I have another machine (running Debian too), and i've installed MySQL there with all the databases and users moved on to, it works perfectly (with phpmyadmin). What I want is to have the first machine running apache + php, and in the other MySQL. How can i do that ?

I've tested making a mysql_connect from a page hosted in the first machine to the other one running MySQL but i didn't work, couldn't connect. I've tried redirecting mysql port to the other machine (iptables) and that didn't work either...

Resuming... I want all my users to work with the first machine, they have their accounts in there and all their files, their pages, etc... And the database running in the other machine.

Bulk Copy Between Two Mysql Servers
I want to transfer data between two mysql servers running on two between machines and i want to add this option in may application. so can any one tell me throught which commands i can do this.

Two MySQL Servers Share Data
Is it possible to have who MySQL servers contact eachother at a certain time intervul and send data to each other?

For example: Mysql A is empty. Mysql B is used for all kinds of things. I want Mysql B to send certain tables to Mysql A every 5-10 minutes.

Detecting MySQL Servers On LAN's
I want to build a script/app to make an inventory of all computers that run MySQL servers. And if possible return their versions. I would be running this script/app from a Windows system, so I would like to use VBScript or Visual Basic 6.0. This way the people I am working with will be able to understand what I am programming too. Further more it would be nice if I couldn't only detect the Windows machines, but also other systems (mainly Linux). Can this be done? And how?

Compile Data From MySQL Tables On Different Servers
I'd like to retrieve data from MySQL tables on websites A, B, and C, to display on website D -- is this possible? Basically, from site D, I'd like to compile the last entries in specific tables in sites A, B and C, and show them on a "summary page". Do I need to import the data into a local (site D) table, or can I retrieve the data from A, B and C on the fly?

What Makes Two Mysql Databases In Two Different Servers Connect?
what makes two mysql databases in two different servers connect? Is it enough with mysql sintax? Do i need another application? Which?

Moving MySql From Development Server To Other Servers
I am using Dreamweaver with php, mysql and Godaddy for Hosting. I have a website developed that runs fine locally using the localhost for both the Web app and MySql. What is the process that I go to to move or export the databse from the development server to Godaddy's MYSQL server. I have not found an "export" function using MySQL Adminstrator, or MySQL Control Center.

Migrating Mysql Servers Between Windows Machines
I just had to do a mass data switch to my windows server.It's been running apache with php and mysql for over a year now.

This data switch meant i just copied the files over to an almost exact copy of my current windows installation.Unfortunatly mysql didn't startup the way everything else did.Now the server won't start at all(dies on startup.) If anybody knows any problems that would probably result from migrating MySQL i'd be highly appreciative. Short of that,how can i find the errors mysql is having,thus allowing me to diagnose a solution the problem.

Link Two Mysql Databases On Two Diffrent Servers
I have 2 different MYSQL databases on two different servers.I want to link the two databases.Is there any mechanism for this like we have database link in oracle.

Changing Servers With Lower Mysql Version
I am trying to change servers and the new server is hosting a lower version of mysql therefore giving me errors when trying to import db.

The dbs are for postnuke and here's the error I am getting:

Error
> SQL query:
>
> -- phpMyAdmin SQL Dump
> -- version 2.8.2.4
> -- http://www.phpmyadmin.net
> --
> -- Host: localhost
> -- Generation Time: Oct 04, 2006 at 12:33 PM
> -- Server version: 4.1.21
> -- PHP Version: 4.4.2
> --
> -- Database: `betweent_business`
> --
> CREATE DATABASE `betweent_business` DEFAULT CHARACTER SET latin1 COLLATE
> latin1_swedish_ci;
>
>
>
> MySQL said:
>
> #1064 - You have an error in your SQL syntax. Check the manual that
> corresponds to your MySQL server version for the right syntax to use
> near 'DEFAULT CHARACTER SET latin1 COLLATE latin1_swedish_ci' at line
>
> I know a little about mysql, but not enough to mess with this...
>
> New version: MySQL - 4.0.27-standard
> phpMyAdmin - 2.8.0.2
>
> My old version: MySQL - 4.1.21-standard
> phpMyAdmin - 2.8.2.4

Mysql Sql Access 2 Servers In Single Statement
Is it possble to access databases in 2 server simultaneously in sql using the mysql client?

I can use sql to access multiple dabases on the same host1 server when I run 'mysql -h host1' but I cannot find a syntax to access databases on another server, which is supported on other db software.

Mysql Replication
Is there a total idiots guide to mysql database replication with a simple walkthrough to follow - if there is I cant find it.

MySQL Two-way Replication
I've recently set up two MySQL servers to replicate each other in this way:

--------------------------------------
# Host 1
#replication section
server-id=5
log-bin
master-host=10.0.1.2
master-user=repl
master-password=password_was_here
master-port=3306
--------------------------------------
# Host 2
#replication section
server-id=10
log-bin
master-host=10.0.1.5
master-user=repl
master-password=password_was_here
master-port=3306
--------------------------------------

So, the questions are:

Does anybody know if I'm doing it right or not?
Does anybody work with such a configuration?
What are the common pitfalls in setting up two-way replication using MySQL?

PS: Yeah, I know that two-way replication isn't officially supported in MySQL, so don't be bothered to post messages like "Hey, man, MySQL won't do it" in this topic.

Mysql Replication
My boss wants me to set up a master mysql server on a UNIX box that replicates to mysql server on a PC box.  I am new to mysql administration. Anyone has step-by-step instruction on how to set this up? 

Mysql Db Replication
I'm trying to replicate a database to a server.

from the server I try :

mysqldump -h remote_host --opt --compress eslsl -u dbmaster -p mysql eslsl
Enter password:

mysqldump: Got error: 2003: Can't connect to MySQL server on
'remote_host' (60) when trying to connect

I'm sure from the remote host name / ip but still can't connect from
another machine.

Does someone see what's going on. Is that a permission trouble ?

MySQL Replication
Can anyone share their experience with replication? In particular I'm
wondering how fast (or how slow?) replication occurs. Could I pull off the
configuration below?

For example, if a person places an order on our site, the update is sent to
the master server. Can that update be replicated to the slaves before the
browser is taken to a reciept page (which is queried against the slaves)?

Mysql Replication
explain abt how to do Mysql 4 replication on linux/windows operating system,

MySQL DB Replication
I want to know a little more about replication and the stuff on mysql.com is a little more detailed than I would like to know for now. I wanted a little overview, the capabilities and whats the reason for replication.
I have a distributed IP cellular system with a DB, it all works with individual DBs, but I would like to setup many distributed systems with couple of DB servers which these systems can access and also have a fall back system.

How do I acieve this? I need replication becuase all these systems are part of the same larger network and hence need to share data, but not all will be accessing the same DB server hence I need to have seperate DB servers.. How do i best do load balancing?

MySQL Replication
Can anyone share their experience with replication? In particular I'm
wondering how fast (or how slow?) replication occurs. Could I pull off the
configuration below?

For example, if a person places an order on our site, the update is sent to
the master server. Can that update be replicated to the slaves before the
browser is taken to a reciept page (which is queried against the slaves)?

MYSQL Replication
in a two device environment i had both machines configured as master and slave to each other.  this works well.  However I cannot find a way to make the central server the slave of two masters.  Is there any way?  conceptually I thought it might be possible to create two different config files with different master-host info in the [mysqld] section and then creating two separate instances of mysql.  would this work? perhaps on different ports?  or am i completely missing the point and there is an easier solution?

btw I cannot create a chain as i cannot be certain that both laptops are on the lan sufficiently often to make it workable.

Replication With Mysql
i have two mysql servers remotely installed,i m using one way replication that mean one master is replicating its data to other slave and both r running fine but now
i need accoring to my program changes made in slave should be replicated too on master.my few confusions are:
1.)should it be possible as auto_inc records will mismatch and database will go asynchronous?
2.)if it is possible how can it be configured.

PHP MySQL Replication
I was thinking of setting up a second server to replicate my master server for high availability.However, because I am not using a VPS or dedicated server, my webhost doesn't support MySQL replication.
My only option is perhaps to use a PHP script on my master slave, and write any MySQL queries to a file. The second server would then request for this file, say every 2 minutes, and apply the queries to its database.
However, there are two concerns:
1) The master server would be slowed down because it will have to write to a file for every SQL query, which can be quite a lot.
2) To ensure integrity, I would have to lock the file while reading it. The master server would then have to wait to process a query when the second server is reading the file. If file reading is slow, especially if there are many queries or high latency between servers, then my website will be awfully slow.

Two Servers
I run two MySQL servers on Windows with the two services.
I read in the docs that it exists a way to identify the servers in my.cnf by
groups and about a tool from Linux to manage the groups.
How can I start a server on Windows through the my.cnf/my.ini 's groups?


Different Db Servers
db masters,

Can I use databases from different servers ?

I mean, for example, I have two sites :

www.site1.com --- hosted by providerA
www.site2.com --- hosted by providerB


The site2 uses databases from providerA for running queries or updating tables

MySQL Replication Log Files
I have a MySQL 4.1 running on a SLES server (SuSE), and the DBA has left the company.  The mysql/var directory is filled with large MySQL Replication logs from the past two months.  Its filling up the 64GB filesystem, using 60G of the space.  How can I clean this up?  

Can I just delete the old log files, or will that break something?   I don't believe any replication is even happening with another server so I'm not sure why this is even turned on.

MySQL Two Way Replication Won't Shutdown
I have read up on MySQL failover/replication and decided that weren't
many cons to setting up two way replication where two servers are both
master and slave to eachother. Here's the my.cnf:

[mysqld]
log-bin
log-slave-updates
server-id=2
master-host=10.0.0.2
master-user=repl
master-password=<password>

The my.cnf on the other server is same except for server-id and
master-host.

This works fine when in use, updates to either server are immediately
shown on the other one. However, I'm not distributing the load, this
was done only for a failover situation when one server goes down, the
other one is available. I'm only doing db queries, selects and inserts
on one server.

The problem is that when I try to shutdown either one, the mysqld stop
hangs: # /etc/rc.d/mysqld stop

Stopping mysqld.
Waiting for PIDS: 7021, 7021, 7021, 7021, 7021, 7021, 7021, 7021, 7021,
7021, 7021, 7021, etc etc etc

This happens on both servers. They're MySQL 4.0.22(tried 4.1.7 with
same problem) on NetBSD 2.0. When I do a STOP SLAVE; on either one, it
takes about 1 min. Then I'm able to shutdown.

Simple MySQL Replication
My question is very simple, i just want to know the BENEFITS of using replication...
I want to grab the summary on how mysql replication works?
Do i really need it?

Problem With MySQL Replication
I'm having an odd problem while setting up one-way replication between
2 MySQL servers. The setup process seemed to go well, and when I
examine everything, like processlists on both servers and the master
and slave statuses, it all seems to be working fine. Whenever I make
an update to the master database, the binlog gets updated on both the
master and the slave. The relay log on the slave also seems to record
the change. The only problem is that there's no actual change in the
database!

The way it's acting almost makes me think that the I/O thread is
working ok, but the SQL thread isn't executing anything it receives.
As far as I can tell, though, the SQL thread is working ok. I know
it's running, and when I run "show processlist" it's status is listed
as "Slave: waiting for binlog update".

Also (and this may be the cause of the problem) when I run "show slave
hosts" on the master server it comes back with:
+-----------+---------------------------+------+-------------------+-----------+
| Server_id | Host | Port | Rpl_recovery_rank |
Master_id |
+-----------+---------------------------+------+-------------------+-----------+
| 1 | vmmysql02 | 3306 | 0 | 1
|
+-----------+---------------------------+------+-------------------+-----------+

I noticed that the Server_id and the Master_id are the same, so I
tried to change that in the my.cnf files for both servers. Afterwards,
I restarted, but it doesn't seem to have changed the server-ids.

MySQL Replication Oddity
At work, we have a master-slave model utilizing MySQL's internal replication. Our web-frontends post to the master server, and are replicated to the slaves.
One application doesn't work correctly. It won't replicate this specific application. At first it led me to believe that maybe it was a permission problem. I changed the user the app was posting under to be the same username as everything else (as in, all the applications that do work).
There are no errors in the logs, the slave threads aren't showing any problems, and even other tables replicate changes just fine. There are no ignores on the databases except for "mysql".
If I execute a "LOAD DATA FROM MASTER", it replicates fine and dandy. But once on its own again, it won't do it. Other things still continue to replicate without problems.

MYSQL Data Replication
I have limited experience with MYSQL replication; which is why I am hoping others with more experience can answer a question or two.
Let's say I have a MASTER MYSQL database.
Let's say there are 50 - 60 other systems where I'd like to have MYSQL running on these "slave" systems; some *nix variant.
These slave systems need to be kept "in synch" with the Master, but it does NOT need to be anywhere near real time.
The data in the slaves could lag as much a an hour or two.
The amount of data in total in the MASTER is in the range of 100MB - 250MB
The rate of changes to the data is in the range 2000 - 5000 DML per 24 hour day.
We control the application so we can/will include date/time each record is created or modified.
You can assume that no records ever get physically deleted; only INSERT & UPDATE (no DELETE).
What are some alternative ways to keep the slave systems "current"?


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