Replication is the process of sharing any level of information so as to ensure consistency between redundant hardware/software resources to improve reliability, fault-tolerance, and accessibility

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Question on having a MySQL 5.1 replicate from a MySQL 5.6 DB

I have a question in regards of what potential issues that might happen with a MySQL 5.1 DB that replicates from a MySQL 5.6 DB. I know the risks involved based on resources such as ...
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pt-heartbeat showing “Host is blocked because of many connection errors”…but connections are well under limit

I'm running MySQL in a master-slave configuration. pt-heartbeat is showing "Host is blocked because of many connection errors"...but connections are well under limit (limit is 600 connections, MySQL ...
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1answer
557 views

InnoDB: “Only one log file found” after binary import

My first one on DBA... After successful upgrading a master MySQL server 5.5 to 5.6.17 (CentOS 6 VPS serer), I done and moved my binary backups to a slave server (same version 5.6.17 but different ...
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MySQL 5.6: Slave_IO thread stops working

Standard replication breaks for no apparent reason. mysql> SELECT @@version, @@version_comment; +---------------+----------------------------------------------------------------------------+ | ...
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1answer
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Replication from EC2 Master to RDS Slave - Connecting to master

I am migrating my company's database from an EC2 instance to an RDS instance. I have already migrated a snapshot of data and am now trying to set up replication to get the data that has been added ...
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200 views

Merge replication issue : conflicts with new data

I set up merge replication with SQL Server 2008, I am having issues when creating new data on clients and trying to synchronize with the remote server. Pulling data from the server works fine. But ...
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MySQL replication between datacenters

I am trying to figure out the best MySQL replication topology, but I am not sure the best way to lay it out. datacenter A | datacenter B ____ | ____ | | | | | | AA | ...
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2k views

Adding slave to existing master-master config in mysql throws Foreign key constraint failed error

We have two mysql servers running in master - master configuration. Now we have to add a slave to the existing configuration. But upon adding the third DB server and starting slave on it, it throws ...
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1answer
483 views

How can I disable utf8mb4 entirely on MySQL 5.5?

I know you're not supposed to do this, but I have a MySQL 5.5 master and a MySQL 5.1 replication slave. That's supposed to be okay, unless I do something stupid like use utf8mb4 that isn't supported ...
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3answers
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Automatic MySQL Replication Fail-over Strategy

I want to know that if replication is down due to some reason as if master is down then what strategy should be followed so that the replication is up instantly without manually intervening the ...
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734 views

MySQL proxy to replication configuration

Is there any solution (say a proxy) that makes MySQL replication cluster behave like one database towards developers? Developers then won't need to worry about using master to write and slaves to read ...
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Mysql replication and ignore tables

When setting up master/slave replication in Mysql, do you then need to ignore any tables in /etc/mysql/my.cnf or should replicate_wild_ignore_table be leaved out under normal circumstances? This is ...
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What is the Maximum Merge Articles in Merge Replication [duplicate]

Possible Duplicate: Hard limitation for merge replication article count? I am using merge replication in SQL 2012. I am looking here: Maximum Capacity Specifications for SQL Server (2012) ...
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1answer
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Some MySQL slave errors?

Master version: mysql-server-5.5.14-1.el5.remi Slave version: Percona-XtraDB-Cluster-server-5.5.24-23.6.340 Binlog format: ROW based I'm using PRM to setup HA for MySQL. Sometime, MySQL slave ...
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3answers
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Replicating only significant records to specific database

I have a remote database which holds data for various databases in various locations. I want to do database replication, but only data specific to a certain database should be replicated to it. I can ...
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3answers
652 views

MySQL - Master/Slave Replication with different server specs

I have a Master/Slave replication (using MySql 5.1 / InnoDB). Currently both my master & slave are running on the same type of server (32 GB RAM, 2 x Intel Xeon 5520 Quad Core 2.26 GHz (8 cores)) ...
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1answer
303 views

Converting 3 Master + 1 Slave to 4 Master - Any advice?

so we have a beautiful 3 master 1 slave cluster running. we would like to convert this to a 4 master cluster. here is how the topology currently looks s1 enslaved by s3 s2 enslaved by s1 s3 ...
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332 views

Has anyone ran into this replication breaking bug before?

I've been having this issue where replication was breaking on colliding primary keys. The annoying thing was these were auto increment generated. I think my issues been tracked down to ...
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Mysql thinks Master & Slave have the same server-id

I've been setting up a master->slave_a->slave_b relationship and having a little trouble. I currently have the master->slave_a replication working fine. Each of the two slaves have exactly ...
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1answer
93 views

mongo converting standalone to replica set causes services down

I have standalone node1 already running for a long time. Now I want to convert it to replica set. I followed steps in https://docs.mongodb.org/v2.4/tutorial/convert-standalone-to-replica-set/ to ...
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1answer
297 views

mysql 5.6 gtid replication slave stuck (system lock)?

I have set up 5.6 gtid based replication (on 5.6.26) it seemed to work when I did it, it replicated my random test db over that I created beside normal data. However at some point something must have ...
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Records not getting replicate from Mysql 5.5.32 to MySQL 5.6

1. I have a MySQL 5.5.32 server (community edition) on one Linux server which is master. 2. I have a MySQL 5.6 server (community edition ) on another Linux server which is ...
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2answers
175 views

Master/Master/Slave Replication

Just trying to get some information on the best route to setup replication for this DB I've got. I'm using MySQL 5.1 I found this and it seems like the idea we have in mind. We're looking to have ...
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248 views

Can we disable binary logging for one specific session or user in AWS RDS

Currently we have a situation to disable binary logging for one set of queries on AWS RDS. We thought to set log-bin=0 for that specific session. As per Amazon, this is not possible. Is there any work ...
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1answer
541 views

MySQL 5.5 Replication to Galera/Percona XtraDB Cluster

We are currently investigating moving our current MySQL 5.5 Master > 5 x Slaves (with Statement Based Replication, apx 250GB data and growing) to a HA clustering option. Mainly to provide greater ...
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333 views

table partition in order to solve frequent deadlock issues - how would I know if it will work?

I use sql server 2005 enterprise edition and have a subscriber DB - part of a transactional replication - that is used for Business Intelligence purposes - they run reports out of it, and SSIS ...
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Deciding on a replication strategy

We have several dozen small-medium (<1Gb) databases on our SQL Server 2008R2 (Standard Edition) server, with one or two more being created every month. The server itself is a fairly well spec'd box ...
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3answers
909 views

Deleting data from a large table with replication

I need to delete all the rows from a given table. The table contains millions or records. The master database is being replicated to several slaves and I wish to do that without creating a replication ...
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mongodb replicaset

I am adding a new member in ReplicaSet and it starts initial sync bur after certain point sync break and start resync again.this process continue and never complete its initial sync.so please resolve ...
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MySQL replication of single DB to same server

I have a DB Server running CentOS 6.4 and MySQL 5.5 from RPMs (not source). I have dozens of databases but one of them is being hit quite hard with large selects which locks out other updates which ...
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249 views

MySQL Slave not updated

This might be a duplicate of questions on the same problem asked before. But all the suggestions to the previous questions do not seem to work in my case. I have set up Replication using SSH Tunnel. ...
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1answer
131 views

Determining replication traffic

is there any way to determine from server statistics* running MySQL, how much traffic(bits per second) WOULD replication consume between 2 servers, without setting-up the actual replication between ...
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1answer
423 views

MySQL - Best long read query solution within a replication based system

I'm working on a project where work in a queue requires a database read against heterogeneous table schemas (InnoDB/MyISAM). The queries constructed during the "read" process can result in 10-15 ...
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1answer
98 views

What synchronizes two delayed replicas, which is part of the replica set, included in sharded cluster?

Please take a look at my mongodb map at http://postimg.org/image/krzvmep4d/ What synchronizes two delayed replicas, which is part of the replica set, included in sharded cluster? How can I use my ...
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1answer
505 views

Native replication from Percona XtraDB Cluster to a standard stand-alone slave

I'm replicating from one node of a three-member Percona XtraDB cluster to a separate slave, using regular MySQL replication. The node is set to write binlog in ROW mode, with log_slave_updates=true ...
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mysql 5.6 GTID replication 'Got fatal error 1236 from master when reading data from binary log'

I Checked SHOW SLAVE STATUS error is "'Got fatal error 1236 from master when reading data from binary log: ''The slave is connecting using CHANGE MASTER TO MASTER_AUTO_POSITION = 1, but the master ...
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1answer
653 views

Approaches for Real time copy of database on same SQL Server instance

I have a draft of requirements that look like this: Production database should be copied in real-time to "Pre-prod" database The Pre-prod database should be available to read and update It should be ...
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1answer
80 views

After adding a slave to Master - Master configuration, slave syncs from only one master

Futher to my previous question, Here is what we have +<------+ | ^ V | S1<---M1 M2 | ^ V | +-------+ what happens is Upon ...
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2answers
224 views

Breaking Semisynchronous Replication in MySQL 5.5

I've set up Semisynchronous Replication between two MySQL 5.5 servers running on Windows 7. My application is running and updating the database of the master server and same is being updated in the ...
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1answer
1k views

Master to Slave to Slave Configuration in MySQL

We currently have 3 MySQL Servers running; the first which contains production data and is due to be retired mysqld Ver 5.5.28-0ubuntu0.12.04.2 for debian-linux-gnu on x86_64 ((Ubuntu)) mysql> ...
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94 views

Change the Existing Topology of a MySQL Replication Setup

I want to be able to edit the topology of an existing replication, is that possible? For example if I have a star topology, I want to edit it to make it a ring one. How can I do that? I'm thinking ...
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3answers
194 views

Where can I learn about MySQL master/slave, master/master, or clustering setups?

What are the best resources you've read or watched about setting up master/slave or clustering for database replication? I don't know much about this. I have a database that is getting rather large ...
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0answers
26 views

JBoss/Alfresco cannot write on slave after failover [duplicate]

Possible Duplicate: JBoss don't fail over MySQL slave using datasource I'm trying to set up an high available MySQL "cluster", using a Master / Slave Replication configuration. I want ...
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1answer
538 views

Replication Broken, List Out of Sync Tables

In a master-slave setup on MySQL 5.5 on RHEL 6.1, when db replication breaks (for whatever reason), what is a good way to: check (and alert) replication is broken? get a list of tables that are out ...
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2answers
3k views

Slave settings not working

I have this machine as slave. Below is the command I ran and stuck. I done the change on the config file and set the id=2 too. Anything else I am missing here? slave start; ERROR 1201 (HY000): Could ...
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2answers
2k views

Client to use the slave when the master is down in MySQL replication

Is it possible for the client to use the slave when the master is down in mysql replication? I have already setup a simple mysql replication having a master and a slave. The client connects to the ...
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1answer
593 views

Programatically testing slave status - What fields in SHOW SLAVE STATUS indicated slave status is OK / in ERROR?

We use pingdom and a few internal heartbeat mechanisms on our product. We would like to add a 'are our slaves running and in good shape' check. What fields in SHOW SLAVE STATUS indicate that the ...
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796 views

Mysql master-master permission replication issue

I came to know it's safe to replicate mysql database to have the users and permissions replicated, from a post in ServerFault is-it-ok-to-replicate-mysql-db. I have setup master-master replication ...
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1answer
1k views

Duplicate entry in mysql slave

I have a mysql master-slave replication setup. when I checked "show slave status", I got the result as "Slave_Sql_running:No" and Last error as "Duplicate entry 'x' on query." But when I tried to ...
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1answer
242 views

Master port is disabled from Public IP, MySQL log is not getting refreshed

My MySQL Replication setup is over internet. Master is on Public IP. If I stop mysql service in master, immediately an error message is thrown in slave. And when I start the service, slave is ...