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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Data sharing between client and server two ways

One of my Silverlight applications is running. This Application is using one central database (SQL Server 2008) and three other client databases (SQL Server 2008) in server other locations. Our ...
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mysql second slave not syncing while first slave works fine

I have a master (m) - slave (s1) setup using mysql 5.1.45 When I try to add a second slave (s2) the slave lags behind and never catches up on the sync. Even after having synced the s2 with the whole ...
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571 views

Is the “load data infile” command in MySQL unsafe in general, or just when using statement based replication?

I'm also trying to understand why MySQL considers "load data infile" unsafe and switches to RBR if running in mixed mode, does that mean it is only unsafe when using SBR?
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MySQL replication to slave having VPN connection to Master

I am setting up an environment in which the Master and Slave are on different networks at different physical locations (both run on MySQL 5.5.20). I have set up a VPN connection from slave's network ...
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1answer
2k views

Master and Slave having same id's

I am working as a remote DBA for some of the production servers. There was replication from Master to Slave. There is something changed in the scenario they have made one of the Slaves as master ...
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2answers
835 views

Can an article in Sql Server replication be based upon a query?

I am looking to replicate the results of a query, is that possible or do I need to rep the tables themselves?
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3answers
633 views

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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1answer
5k views

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
691 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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2answers
2k views

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
2k views

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 ...
2
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1answer
227 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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1answer
1k views

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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1answer
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 ...
2
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1answer
535 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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1answer
2k views

MySQL master/slave replication… structure not being replicated

Edit: I might have answered my own question while going back thru the links for this post. I would still like to get insight from more experienced DBA's and perhaps make the information easier to ...
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3answers
5k views

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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2answers
779 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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2answers
1k views

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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2answers
10k views

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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0answers
27 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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3answers
694 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
313 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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1answer
337 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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2answers
5k views

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
106 views

MongoDB allocates chunks only to Primary when sharding is enabled

I'm setting up an instance of MongoDB with 3 shards. I've setup everything seemingly correctly by following the docs and comparing my config with that of a friend who has a similar setup but with a ...
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1answer
69 views

How Merge Replication Works

I'm not DBA at all but I need to do something to synchronize four SQL server databases. I just discover there is a Merge Replication system in SQL Server 2008. At this moment I'm reading the ...
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1answer
222 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
722 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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305 views

Records not getting replicate from Mysql 5.5.32 to MySQL 5.6

I have a MySQL 5.5.32 server (community edition) on one Linux server which is master. I have a MySQL 5.6 server (community edition) on another Linux server which is slave. I have installed various ...
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2answers
241 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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1answer
733 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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1answer
407 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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286 views

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
1k 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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123 views

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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185 views

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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2answers
267 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
163 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
445 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
103 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
559 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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0answers
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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
725 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
82 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
235 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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96 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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201 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 ...