MYSQL :: Two Master Servers

Master Servers Merge
I want to make query to merge table1 from master server A and table2 from master server B (ex: select * from table1, table2) because my site becomes heavy traffic and database gets bigger. It means I need to separate tables and create new database on other master server B. Do you know how to make "merge" from master server A and B?

Master Master Replication, Truncate Table Fails, Version 5.0.22
I have set up a master master replication link between two databases, prototyping an idea. Anyhow, adding records and deleting works, both get updated, creating and dropping tables works, but truncating tables doesn't work.

My main questions are, why doesn't truncate work, and if it doesn't work, what else doesn't work across a master-master replication link?

Master/Master Replication Problems
I was wondering whether someone could help me.

I have inherited set of replicated servers from a guy I used to work with, basic set up is:

Master1/Slave2 - Server ID 1
Master2/Slave1 - Server ID 2

When I looked at the logs it looks as though Server ID 2 is well out of step. Having looked at the slave status it appears that that Slave_SQL_Running state is set to No and a particular piece of SQL is causing the problem. Having ran the SQL on the particular server it has now problem at all.

Now my understanding of this type of set up is that Server ID 1 writes directly to Server ID 2, then Server ID 1 is in turn replicated to.

But for the life in me, I cannot understand why this piece of SQL is causing the problem. Can anyone offer me any ideas on how I can best get to the bottom of this, I'm really struggling with this. There was me thinking replication just worked!

Is there an ability to get MySQL to log all queries it is running, so I can get to the bottom of all queries currently being executed?

Master / Master Asynchronous Replication
Currently we have a web based application that is mostly reads (4:1
r/w). It is using a single MySQL database server. Is there any way to
have two database servers in a master/master configuration such that
writes to either database server are replicated to eachother. Basically
even though we have a 4:1 ration of read/write the writes happen often
enought that when the database goes down the app stops working. I know
how to get this working in Oracle (insert big laugh here) but Oracle is
cost prohibitive. Any pointers?

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

Relay-bin On Master?
I am getting relay-bin logs on my master server. They are all empty except
for one line that reads:

þbin

I have no slave settings in my my.cnf file. Any idea where these are coming
from and how to turn them off?

Replication From 2 Master
I am running MySQL V4.0.14 with replication. I want to replicate specified databases from 2 different masters into one slave. Is this possible?

Relay-bin On Master?
I am getting relay-bin logs on my master server. They are all empty except
for one line that reads: þbin

I have no slave settings in my my.cnf file. Any idea where these are coming
from and how to turn them off?

Replication From 2 Master
I am running MySQL V4.0.14 with replication.

I want to replicate specified databases from 2 different masters into one
slave. Is this possible?

Clustering And Master Down
I want to create replication databases with multiple servers, but i need more informations about consequences when the MASTER database crash : what happens ?

And, if one slave crash : what happens ?

Is it like RAID 5, mysql just work in degraded mode and continue to work, or is it fatal ?

Can we compare the replication system by MySQL with the Grid Computing of Oracle ?
I don't think MySQL offers a clustering mode for calculating and searching rows, am i wrong ?

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.

Redundant Servers
So physical Server A has a mysql database running on it, and physical Server B has an identical database running on it. so if one of the physical servers goes down, I can get information from the other mysql server.

I also want them to keep identical information on each other, so if a user updates his password, it's updated in both databases in real time....and when one of the servers comes back online, it gets rebuilt by server that stayed up.

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

Join Across Servers
Can you join two tables across different servers in mySQL, or am I
dreaming of Oracle?

Slave Servers
i have do replication with 1 master server to 3 slave servers.
And i want to grant the 3 slave servers only select option for all user;

Running Two Servers
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I am looking into installing 2 mysql servers on the same windows 2000
PC. From what I have found, it is usually possible to have 2 different
versions on the same machine. (Usually one for testing and the other for
production). However, I am trying to run 2 production servers, one for
personal family info, and the other for business opportunity.
Being that I just started using mysql, is it possible then to have the
same version installed twice, or how do I accomplish my task?

Master/Slave Restoration.
I have 2 servers (A and B) setup as Master and Slave respectively.
Upon A's failure, all client's request will be directed to B.

How can I set A to become master again after its been restored from
its failure? In chapter 4.10 of mysql docs, it mentioned (vaguely)
that A will become B's slave to sync all operations that had happened
after the failure. Finally, upon full sync switch A to become Master
again and B to slave.

How can I setup A to be a slave of B? The problem I faced is that I
can't find out what the bin log and position is from B since "show
master status" is always empty. I guess B still thinks its a slave.

Dual Master Follow-up
I posted a much longer winded question in the replication forum a few days ago, but after much research I realized I just need one piece of information that I seem to be reading conflicting opinions regarding. Is a dual master configuration considered bad form for MySQL Network users? I'm only replicating ONE dynamic database, and there are NO auto-increment fields.

I will have a max of 40 concurrent users (20 average), so I don't think I'll have a big problem with anything becoming out of sync. Should I avoid writing on both machines or is the autoincrement issue the only reason why writing to both masters would cause a problem?

MySQL Master/Slave
In the case of 2 3.23.X series mysql databases in a master/slave
replication setup (myiasm tables), if a FLUSH TABLES WITH READ LOCK is
put on the slave, does the master effectively lock too because it is
waiting for the binlog update(s) to be confirmed from the slave, or
does the master merrily carry on not caring in the least that the
slave tables are locked?

Master-connect-retry
I installed MySQL 4.0.14 on a new Linux machine unde the form of two
servers: one master and one slave.

I met many unsynchronized events so it was appears conflicts from this late
of the changes from master to slave. I put the master-connect-retry to 2.
Now it seems to work clearly but I cannot see the master-connect-retry
variable with "show variables" command. Is this bad? Shall I have another
unsynchronized events in the future between master and slave?

I manually repaired each conflict or I did RESET MASTER/SLAVE to escape from
the errors' labirint.

Mast-Master Replication
I am unable to find any information about master-master replication. I
need to replicate 1 mysql server over to other as a standby master
server.

Mast-Master Replication
I am unable to find any information about master-master replication. I need to replicate 1 mysql server over to other as a standby master server.

Dual-master Replication
I would like to set up a dual-master replication setup for my MySQL
database
(running on RedHat 9). Could someone please point me to appropriate
website that details this setup process and management as well (i.e.
what should I do if one of the masters goes down?).

Also, are there any solutions that allow auto-increment fields in this
kind of setup?

Mast-Master Replication
I am unable to find any information about master-master replication. I
need to replicate 1 mysql server over to other as a standby master
server.

Show Master Logs
When would SHOW MASTER LOGS be used?
I've had mysql hang 4 times this week and we've done all we can to fix it - but it seems that what we have done has only reduced the backlog of queries that occur when it hangs - now it hung again this morning and the only thing of note in the mysqladmin process list was SHOW MASTER LOGS - I googled it and there seemed to be a few cases of crash related bugs with this particular command - now I know I didnt issue the command so what would have done

Running 2 Msql Servers
I want to run two mysql server on the same win xp machine independent of each other: one on 3306 and one on 3309. How and what files do I have to modify to set the second server port to 3309 permanently.

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?

Join Tables On Other Servers
Is it possible to, for example, join a table in a database on another server in a select?

Design Of Database Servers
Database design is well covered in undergrad CS. But does anyone know of
a textbook that deals with the design of database servers (and probably
touches on databases themselves), and perhaps deals with interpreting SQL inquiries?

The motivation for this is that I wish to write a database server for a
proprietary operating system (it resembles POSIX, but is not completely compliant)
for an embedded processor system that exchanges queries from clients also
employing embedded processors. Stored data is all in one place.
I'm a little familiar with the MySQL source code, but I don't
wish to replicate something that complex. The sort of investment
I'm talking about should involve no more than three man, er, person-months
by an experienced C++ programmer with plenty of experience in systems
and database programming for both Microsoft and Linux platforms.

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

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?

Sharing A Database Between Two Servers
I have 2 harddrives, one with linux and windows, and the other holds all my php and sql databases. I set up the databases with windows and everything is fine. Now I want to be able to just have the linux version of mysql look at that same database on the second harddrive and work with the database. The error I get is "Can't open file:

'**.ibd' (errno: 1): "** being any of my tables. Is it possible to configure them to work together in anyway? I dont want to manually have to dump the database and then reload it every time i switch between the OSs... any suggestions?

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

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.

Two Servers On Windows And My.cnf/my.ini Groups
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?

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

Scripts, Databases And Servers
Is it possible to have a script in server1 calling a database located in server2 (both remote servers)?
I made a try but it didn't work.
PHP Code:

$hostname_owner = "mysql.server.com"; // this is remote
$database_owner = "database";
$username_owner = "owner";
$password_owner = "passw";
$owner = mysql_connect($hostname_owner, $username_owner, $password_owner) or trigger_error(mysql_error(),E_USER_ERROR);

Moving Databases Across Servers
I just found out that my host is running an old version of mysql, and I think that's why alot of the things I've written aren't working. I've got host space at another server with a newer version of MYsql, and I'd like to transfer most of my work over there.
...But I don't want to have to completely rebuild all my databases and their entire contents.Is there some simple way anyone knows to download the tables & contents of a database from one host and then put it back up on another?

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

Replication With Master And Several Slaves/Masters
At the company I'm working (a road survey centre) where about to start a new project.

We're planning to create web-based application with php, javascript, maybe we're going to use AJAX but certainly combined with a MySQL database to store all of the data.

Since users/researchers have to be able to work off-line on a laptop. Our idea was to install, via XAMPP or something like that, the complete package (i.e. Apache, PHP, MySQL) on each laptop. On a main server we have the same but probably a Linux system.

Now, I know it is possible to replicate the DB on the laptops with the main DB. But is it also possible to update/replicate the main DB with results from the/a laptop after working a day off-line? So it becomes available on each laptop after they done a replication from the main DB?

Maybe a long post for a small question, but I wanted to draw the "context" in wich it is going to be used. A question you are about going to ask me probably is: "why they have to be able to work off-line?" Quite simple: Not everywhere in the world you have wireless internet access + the onsite laptops need to communicate on site with serial devices GPS, Gyroscope, and such like. Wich is for a webbased application running on a server thousand miles rather difficult...

Linking Master Db With Other 3rd Party Plugin Dbs
I imagine this is a somewhat n00bish question, bear with my while I learn the ins and outs :)

I'm constructing a master product DB (MySQL) and have some other 3rd party (PHP) contributions I'd like to use in the interest of not re-inventing the programming wheel.

Specifically PHP Point of Sale, and osCommerce down the road. How can I link certain columns together so I don't have to re-enter information. For example, if I have my own master product table, with a column called 'description.' how can I link that with PHP Point of Sale's 'description' column?