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)
Related
We are currently using binary replication from our master to slave.
Is it possible to enable the GTID on the slave only? (this is required from some other application reading from the replicas, but we don't want to make changes to master)
Are there any reasons why this should not be possible?
See https://dev.mysql.com/doc/refman/8.0/en/replication-mode-change-online-enable-gtids.html:
From MySQL 8.0.23, you can set up replication channels to assign a GTID to replicated transactions that do not already have one. This feature enables replication from a source server that does not use GTID-based replication, to a replica that does.
Read the rest of the documentation I linked to for more details.
I understand this paragraph to mean you cannot do what you describe on a version older than 8.0.23. If you want to do this, you must upgrade at least the replica to 8.0.23.
However, I'd recommend that you enable GTID on your source instance, not just the replica. You can do this on older MySQL versions, and there are other advantages to using GTID throughout your replica-set. I don't know why you don't want to do this, but I'm not able to think of a good reason.
In case of MySQL 5.7, it is not possible to enable the GTID in replica only. Follow this guide to enable the GTID: https://dev.mysql.com/doc/refman/5.7/en/replication-mode-change-online-enable-gtids.html
We have a common database in MySQL 5.6 and many services are using that. one of the services want to migrate some tables from common database to new MySQL server 5.7.
The old MySQL server continuously using by another service. The total data size is around 400GB.
Is there any recommended procedure?
Two Approaches
Approach: 1
create a slave with mysql version 5.7 and replicate only the common database with the below option replicate-db
At the point of no feeds happening on master, and no lag in slave. Use this as a new server, by stopping the slave and disconnect the master from slave.
On slave:
STOP SLAVE
To use RESET SLAVE, the slave replication threads must be stopped
$> RESET SLAVE
On Master:
Remove the replication user
FLUSH LOGS
Approach:2
Try the backup method
Since the db size is 400 GB, the mysqldump won't be sufficient.
Try partial backup method using xtrabackup:
xtrabackup --backup --tables-file=/tmp/tables.txt
Once the Backup has been completed, verify and restore it into the new server version 5.7.
Reference:
https://www.percona.com/doc/percona-xtrabackup/2.4/xtrabackup_bin/xbk_option_reference.html#cmdoption-xtrabackup-tables-file
np: On both approaches, make sure to check the table/mysql version compatibility [5.6 vs 5.7]
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
I'm kind of lost there, I want to setup a common MASTER/SLAVE replication on a MariaDB database. I choose MASTER/SLAVE over MASTER/MASTER to avoid complexifying things. The SLAVE will be used only if the MASTER server is down.
I've setup MariaDB 10.0.x, but when I start reading on how to achieve this replication, they introduce Galera, which, if I understand correctly, replaces MariaDB.
What do you use to tell the SLAVE server to take the relay if the MASTER server is down ? Is it handled automatically via the Galera Cluster ?
If possible, I don't want my application to be aware of the slave server : I just want to configure it with the IP of MariaDB MASTER, and if it can't be reached, to use the SLAVE instead. (But I do not want to specify this fallback in the application level)
Thanks
What you are looking for can be achieved. I just completed a setup of MariaDB 10 using asynchronous replication (not Galera). To ensure maximum uptime I setup master / master replication and used mysql-mmm to monitor the setup. This tool will manage a virtual IP and point it at one of the two masters for writing purposes. This ensures consistent writes against a single master as to avoid corruption of the data. If one master fails the virtual IP will be mapped to the other master. This provides the high availability aspect. The instructions stated below were very clear and easy to follow.
http://mysql-mmm.org/mmm2:guide
Good luck!
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.%