I am trying to configure MySQL databases using the Master-Slave replication. Before I realized that I had to set up my environment using this replication, I already have 2 separate servers running their own MySQL DB. Each of these servers are configured the exact same. The MySQL DB are configured with hundreds of tables.
Is there a way that i can set up (Master-Slave) Replication using the configured DB's? Or will i have to start from scratch and configure the replication first and then load in all the DB tables?
You can delete all data from one of the servers. Remaining one with the data will be your Master. Then use mysqldump to backup all the data and insert it to the slave.
Take a look for the detailed instructions on the page below:
https://livecaller.io/blog/how-to-set-up-mysql-master-slave-replication/
If the data is exactly same in both the MySQL database then you can start master slave replication, but you need to be sure that the data is same. MySQL will not check that, and if there is some discrepancy in the primary key then it will throw error immediately after next DML statement.
To be on a safer side, drop the database from one server, and restore it using the MySQL dump of another server. This will give the surety that database is same on both the server.
Take the reference from the below link to establish replication between two MySQL servers.
https://www.digitalocean.com/community/tutorials/how-to-set-up-master-slave-replication-in-mysql
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I have been trying to start replication in a mysql database. I followed all the steps from the mysql manual to setup and configure the replication.
http://dev.mysql.com/doc/refman/5.1/en/replication-howto.html
I could start the replication without any trouble. Newly inserted data was replicated properly.
But after a while I observed that though INSERT are working, the UPDATEs are not replicating. So, my replicated database contains data just as it was inserted first time.
My master database is on an UNIX server with MYSQL-5.1.56. The slave is used in Windows using WAMP package with MYSQL 5.5.8. I have also tried a slave with lower version mysql with WAMP5, with same effect.
Please share your ideas and experience on this. Thanks.
I have similar problem. I know it's old thread but it can help others:
link: mysql replication works only if I choose database by USE database
I sorted it out a few months ago. The problem was, I tried to replicate only one single database, and set binlog_do_db and binlog-ignore-db options in master to select only that database. But that left out any statement which was executed without selecting database by USE database, as kayn said. Using replicate-ignore-db and replicate-do-db options in slave would do the same. So I finally fixed it by using the replicate-wild-do-table option in the slave, referenced here. Added the following line in the configuration of the slave server.
replicate-wild-do-table=mydb.%
Is there a way to add a new database to the replication without having to restart the master server? I can't seem to find a way and I would like to minimize the downtime to a minimum.
BTW, I tried using this to speed up the restart. Bringing down the value close to 0 on my master takes forever, plus it adds a lot of load on the machine.
I am using MySQL 5.5.20.
You shouldn't need to do anything to enable a new database for replication. All DDL and DML statements should be recorded in the binary log, and be read by the replica and executed by the replica's SQL replication thread.
It's another story if you use replication filtering on the master (--binlog-do-db) or filtering on the replica (--replicate-do-db).
You can use wildcards in any of these replication filtering options, so that you include (or ignore) new databases automatically if the database name matches some naming conventions you design.
I want to create Database replication i try but some problem is there so give me full steps of How To Set Up Database Replication In MySQL
Never done it personally at work but we do use it.
Seems that you want to setup a master/slave setup, the slave beeing the replicated server.
http://dev.mysql.com/doc/refman/5.0/en/replication-howto.html (check the documentation is up to date with your mysql version.)
Here is a step by step instruction how to get MySQL master-slave replication automatically installed and later scaled http://blog.jelastic.com/2017/03/14/scalable-mysql-master-slave-replication/ (if you are ready to run this cluster in the specific cloud)
I have an existing mysql replication set up (Windows 2008 to Ubuntu 9.04) and created several new tables in the master database. These are not showing up in the slave database.
Do new tables automatically get copied to the slave DB, or do I need to set up replication again?
Thanks!
I'm going to assume that other data is successfully replicating.
Replication in mysql is per-server, so the most likely problems are that either you aren't binloging the events, or that the slave is ignoring them.
For binglogs, verify you aren't turning sql_log_bin off for the connection (which would require SUPER) and that the various options binary-log options are set correctly. You can verify this by running mysqlbinlog on the server's binlogs.
On the slave side, check the replication options.
This is the scenario:
I have a MySQL server with a database, let's call it consolidateddb. This database a consolidation of several tables from various databases
I have another MySQL server, with the original databases, these databases are production databases and are updates daily.
The company wants to copy each update/insert/delete on each table in the production databases to the corresponding tables in consolidateddb.
Would replication accomplish that? I know that replication is done on a databas to database, but not on tables that belong to different databases to one target database.
I hope my explanation was clear. Thanks.
Edit: Would a recursive copy of all tables inn each database to the single slave work? Or is it an ugly solution?
To clear up some things, let's name things accordingly to current mysql practice. A database is a database server. A schema is a database instance. A database server can have multiple schemas. Tables live within a schema.
Replication will help you if you want to duplicate schemas or tables as they are defined on the master/production server. The replication works by shipping a binary log of all the sql statements that are run on the master to the slave which dutifully runs them as if they run sequentially on itself.
You can choose to replicate all data, or you can choose some of the schemas or even just some of the tables.
You can not choose tables from different schemas and have them replicated into one schema, a table belongs to a specific schema.
By the way, important notice. A replication server can not be a slave to multiple masters. You could mimic this using federated tables, but that would never copy the data to the consolidation server, just show them as if the data from different servers were on one server.
The bonus of replication is that your consolidation server will more or less have updated data all the time.
You could take the binary logs from each of the masters, parse them with mysqlbinlog and then run that into the consolidated machine.
Something very approximately like:
mysqlbinlog [binary log files] | mysql -h consolidated
you'd need some kind of simple application (I suspect it could be done in bash if you needed) to wrap the logic.
Check out Replicating Different Databases to Different Slaves, see if it helps you in any way.
MySQL statement-based replication (basic replication) works by running the exact same statements that were run on the master on the slave. This includes information about what database the table was in.
I don't think MySQL provides any built-in way to move replication statements between databases (i.e. "insert into db1.table1 ..." -> "insert into db2.table1"). You may be able to trick it by manually altering the replication logs on the fly, but it wouldn't be out-of-the-bod MySQL replication.
You might be able to pull it off with MySQL Proxy
You may want to check out the maatkit toolkit. It's a free download and has a host of tools that specialize in optimizing things like archiving tables. I've used it on past projects to duplicate certain data to another DB, etc. You can do it based on time or any other number of factors.
To the best of my knowledge you can set up replication (MySQL 4+) and in the my.cnf file have the slave either only process certain tables or have the master log only certain tables, either way will solve your problem.
Here is a guide to some techniques:
http://www.onlamp.com/pub/a/onlamp/2006/04/20/advanced-mysql-replication.html
I have very few problems with replication set-up, all my problems came trying to sync DBs, especially after a reboot etc.