I have a MySQL Replication setup up and running:
Database A (Server 1 as master) --> Database A (Server Z, acting as the slave)
I now want to use the same Slave Server (Z) to be a slave of two other databases; totally different databases (e.g. B and C), not other copies if Database A.
I've followed this simple guide:
https://www.digitalocean.com/community/tutorials/how-to-set-up-master-slave-replication-in-mysql
But when it comes to adding the second database to the slave server in /etc/my.cnf, I don't see how it's possible to have more than one profile.
Basically I am thinking I need both of these blocks in my.cnf on the slave server but it won't be that simple, right?
log_error="/var/log/mysql/error.log"
server-id=2
log_bin="/var/log/mysql/mysql-bin.log"
binlog_do_db=database_a
log_error="/var/log/mysql/error.log"
server-id=3
log_bin="/var/log/mysql/mysql-bin.log"
binlog_do_db=database_b
Is it possible, or do I literally need a new slave server for each unique database I want to replicate?
Is it possible to, on the slave server, have specific conf files for each database, e.g. /etc/databasea.cnf and /etc/databaseb.cnf so I can specify different settings for each database?
Thanks in advance
Multi-source replication is only available in MySQL starting with 5.7.6 or MariaDB starting with 10.0.1.
Multi-Source Replication enables a replication slave to receive transactions from multiple sources simultaneously. Multi-source replication can be used to back up multiple servers to a single server, to merge table shards, and consolidate data from multiple servers to a single server. Multi-source replication does not implement any conflict detection or resolution when applying the transactions, and those tasks are left to the application if required. In a multi-source replication topology, a slave creates a replication channel for each master that it should receive transactions from.
Source:
MySQL : http://dev.mysql.com/doc/refman/5.7/en/replication-multi-source.html
MariaDB: https://mariadb.com/kb/en/mariadb/multi-source-replication/
Related
I am having a difficult time in setting Master-Slave configuration.
Master Database runs on Ubuntu( Amazon AWS instance) and successfully set-up master replication.
I have localhost as a Slave Server. (Windows Machine).
Snapshot of Master Database
Master database has record
Binar Log Information
Process List on Master Replication
Status of Master Replication
I debug master replication which works okay I guess.
On the Salve Side:
Status on Slave Side
Even though MASTER_LOG and MASTER_POS are synced but data doesn't.
Currently, I have 0 table on Slave side and 34 tables on Master side.
Tables on Slave side
I am open to any suggestion or any reference do you have.
I spend an entire day and trying to find what I did wrong.
I want to Sync my Local database with a database hosted on remote-server.
Update: Thigs I did to debug the Master-Slave Replication
Checked Master Database is up and running.
Master Status and Connected Slaves. [Which includes unique id for
each server.]
Slave database is up and running [Including Slave IO Thread and
SQL thread is running.]
These three steps ensure that Master-Slave replication is up and running without any problem.
Handling Data Sync Problem
Created/update/delete data in the master database to check
whether data is sync on a server or not.
Checked Binary Log [Specifically I checked the file size. If I
entered data file size will continuously increasing.]
Thanks in advance.
we had similar problem - read more about gotchas in "binlog-do-db" and "replication-do-db" and related parameters. Here is a big problem with crossdatabase references. At the and we had to remove these settings limiting replication.
Why MySQL’s binlog-do-db option is dangerous
Gotchas in MySQL replication
As your show slave status output says you enabled Replicate_DO_DB for the DB "Arihantpos" at the same time you did Binglog_Do_Db for the same db
try to remove Binglog_Do_Db from config file and restart mysql and start replication again
I have two mariadb servers one is configured as master and the other as a replica of this master. I have created a database named params on master and it has a table with a couple of items in it.
How can I see this table and access or modify it using the mysql shell on the replica?
Is this even possible or I have miss understood the replication altogether?
Check that replication works
If you aren't seeing the database on the slave replica, it would be good to check that the output of SHOW SLAVE STATUS doesn't return any errors. A good resource for getting started with replication is the MariaDB KB article on the subject.
When you have confirmed that replication works, you can connect to the slave replica and you should see the database there.
How replication works in MariaDB
Replication in MariaDB will propagate all changes that happen on the master server to any slave servers that are replicating from it. This allows you to read the same data from multiple places without burdening the master server. It does not allow you to seamlessly share data across multiple servers (a Galera cluster offers some of this).
The downside of master-slave replication is that when you want to make a change, you have to make it on the master in order to keep the data consistent across all servers. The benefit of it is the higher availability of your data and increased throughput of read queries. The Replication Overview article has a more detailed description of what replication is and lists some use cases for it.
I couldn't find an answer to my question.
I have 2 mysql servers.
1) Master server
2) Slave server
Now i configure them for replication. After configuration the records which i add in master server are successfully replicated on slave server. But i also need those records which are already in master server (before replication setup) to be replicate in slave server (after replication setup). Now how can i replicate those past records from master server to slave server?
Replication doesn't support this.
Standard procedure is to start replication on the master, note the replication position somewhere, take a db dump, import it into the slave, and enable replication from the previously noted position.
mysqldump has a flag to automatically configure the slave's replication position in the dump file.
Already configured Master-Slave Replication among two different machines. Now the problem is that it only allows the Master to enter the data and Slave to view this. the changes which made in Slave is not reflected in master.
My question is that is it possible to create a full duplex replication among two MySQL servers. ie, If i change the data either in master or in Slave both will reflected in both the machines.
References:
MySQL Master-Slave Replication
Steps to configure Master-Slave Replication
Yes, but there are risks, because replications is asynchronous. That is, both servers could insert the same row, and then when they process the replication log from the other server, they get a conflict.
You can listen to more about this problem in this free webinar: The Hazards of Multi-writing in a Dual-Master Setup
You should consider using a cluster solution with synchronous replication, like Percona XtraDB Cluster.
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.