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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Mysql replication is enabled but stuck at “waiting for binlog to be updated”

I have set up replication between an existing database (server-id=23), and a new one (server-id=51). I have followed the steps in this stackoverflow question, but replication is not happening. On ...
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243 views

How to generate replication snapshot without locking tables

When I reinitialize subscription and generate new snapshot it locks all tables and makes the database unusable for a very long time (never waited it out). Is there anyway to do this without locking?
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Syncronize mysql databases between local and hosted servers automatically

We have many website with Development , Staging and Production Server. we have many developers for many projects, we need a solution to synchronize the database with developer database with staging ...
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Error configuring SQL Server as Distributor

I'm trying to configure replication on a new install (moving to SQL 2012) and I keep getting the same error even after messing with the service name, folder permissions, etc... Using the Configure ...
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637 views

MySQL slave stuck at 'System lock' most of the time, high CPU usage

Let me describe what we are facing now: We have a MySQL Master-Slave, Row Based Replication setup and at the moment, the slave is stuck with a perpetual System Lock. The Master is an active server ...
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95 views

Can scheduled and continous replication configurations exist side-by-side on the same master/slave servers?

Environment We have a core sql server cluster. This cluster contains some databases that get replicated to a load-balanced sql cluster of currently 3 servers. These databases are replicated each 12 ...
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477 views

All four data nodes in MySQL Cluster in same node group

I am testing MySQL Cluster 7.2. I have two servers, mysql1 and mysql2. I want the management server and two data nodes to run on mysql1 and two other data nodes to run on mysql2. My config.ini file ...
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1answer
99 views

Mongodb replica sets: why does my master server occupy more disk space than my slave?

I have two servers on my replica set. Let's call it the master and the slave, for the purpose of this discussion. The master was the original one, and the slave was replicated from that master. At ...
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off-site Dataguard replication status check [on hold]

Kindly assist with step by step approach for monitoring replication as it progress from our Primary to Secondary Data Center. A short script or command that can accomplish this task will be ...
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3answers
261 views

How to remove master role from MySQL server

I have 2 MySQL servers, one is the master and other one is slave, that's all good. The problem I have is that the slave is also set up as a master. I would like to disable or remove the master role ...
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Mongo Memory mapping file size issue

I am witnessing some performance issues in my Mongo Sharded cluster. I checked the serverStatus for the memory uses on my shards This is the output Shard one Primary RAM size 512 GB "mem" : { ...
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71 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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348 views

exception: hosts cannot switch between localhost and hostname

I created a replication set. I added localhost in the set in the beginning, but when I try to edit the member with the actual hostname. I get error "exception: hosts cannot switch between localhost ...
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Mysql Master-Slave replication catchup and bin_logs

I have set up MYSql Replication using 2x 128gig ram 24 core cloud servers. we have a massive live database that cannot experience down time due to the high volume of data input. I have found while ...
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1answer
122 views

Using non-replicated read/write databases on a MySQL slave server

I have a MySQL slave server that has two databases being replicated from a master. What I'd like to do is add a third database that I will exclude from replication and use as a read/write database. ...
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Did this trigger break replication?

I added a trigger to a replicated database. DELIMITER $$ USE `database`$$ DROP TRIGGER /*!50032 IF EXISTS */ `some_ins_after`$$ CREATE /*!50017 DEFINER = 'user'@'%' */ TRIGGER ...
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13 views

Setup MongoDB replica servers with different power?

Is it a good practice to setup replicas with the same machine size (wrt. CPUs, RAM, Bandwidth, etc.) or can replicas be based on smaller machines? One usecase might be to have a small non-voting ...
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88 views

PostgreSQL replication with fsync disabled?

I need to run PostgreSQL in-memory (for performance reasons), so I intend to disable fsync, which means that no writes will be sent to the WAL. However, as part of my scheme to meet another ...
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1answer
90 views

Start mongod instance on replica set as background job

I have setup a Mongodb replica set with 1 secondary node. When i execute on secondary sudo mongod --replSet rs0 --dbpath /data --port 27017 --oplogSize 700 The primary and secondary nodes are ...
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430 views

How to user the Tablediff Utility with Replication Filters

I am using merge replication in SQL 2012. I am trying out the TableDiff utility to show non convergence. I see a problem with this approach though. This is because I am using parameterised filters to ...
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317 views

pgpool2 not working on my Ubuntu i686 athlon i386 GNU/Linux

I am trying to implement replication and load balancing on my Ubuntu i686 athlon i386 GNU/Linux.for creating database clustures I have installed postgresql contrib 9.1.11 having initially database ...
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77 views

Can I change the default settings for SQL Server Replication

Is there a way to change the default setting in SQL Server replication? Example when I create an new article I want to have the create Non-Cluster set to true all the time.
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227 views

SQL Server replication conflicts after migration from 2000 to 2008

I got a suggestion over at Stackoverflow to post here....greatful for any and all help. Please bear with me I think this might take a while to explain. For many years now my company has hosted a ...
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103 views

Can a slave with a dynamic ip update the master

How can I setup mySQL replication in such a way that a slave on localhost with dynamic IP can update the master as well as get updates from the master which has a static IP. The slave will not be ...
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12 views

MySQL - Migrating from Master-Slave replication to Master-Master

We currently run 2 large mysql master-slave replication trees. Each tree is built with one master, several 'middle' slaves replicating from the master, and 'end' slaves replicating from the 'middle' ...
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432 views

MySQL Master-Master Replication not syncing

SETUP: I have a WAMP MySQL Master-Master replication setup on 2 machines with sync_binlog=1 for safety. Machine config: Windows Azure Standard 2: 2 core, 4GB RAM, Windows Server 2008, MySQL 5.6.12, ...
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337 views

MySQL slave taking too long on “Queueing master event to the relay log”

I have two mysql mysql slave servers. The DB version is: mysql> show variables like '%version%'; +-------------------------+-----------------------------------------------------+ | Variable_name ...
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Replication Strategy for Multi-Office Database

I'm considering options for setting up a repository of large spatial datasets that can be used by employees across our company. We have offices scattered around the US. Our employees utilize ...
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22 views

choosing between the slaves on streaming replication

We are building a new streaming replication setup on postgres 9.3 integrated with pgpool for load balancing and failover, and repmgr for replication business. We have seperate daemons running on all ...
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25 views

What exactly should I backup in MongoDB when using replica sets?

I have several instances of MongoDB replica set servers with a primary and a failover machine for each replica set. The primary machine makes daily backups by creating an LVM snapshot and copying all ...
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83 views

MongoDB can't add new replica set member

I have a replica set, and I added a new member to the set. The initialSync begins for the new member and rs.status (on primary) shows STARTUP2 as status. However, after a long enough time, there's a ...
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3answers
774 views

postgreSQL 9.3 streaming replication delay

I'm running a fairly simple WAL streaming replication setup between two postgreSQL 9.3 servers that are on a private 1Gb LAN, but recently I've noticed that there is an increasing amount of ...
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89 views

Oracle Data Pump Import with running advanced replication

In our system we have a running advanced replication between two databases(11g release 2) and want to use pump import to import a backup on one site. However the imported data is not replicated to the ...
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8 views

Mysql 1 way replication master lost data replication still has

Had a master mysql on (windows) improper shutdown. Many records could not be recovered and investigation found slave had records master did not have. Did not restore over master - left as was. As if ...
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577 views

MySQL failover - Master to Master Replication

My company is trying to implement a MySQL failover mechanism, to achieve higher availability in our webservices tier - we commercialize a SaaS solution. To that end we have some low-end VMs scattered ...
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161 views

Replication with FileStream

I need to setup database replication (for high availability) on a database that uses FileStream. This is on SQL Server 2012 Standard Edition, so Always On or Peer-to-Peer replication is not an option. ...
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9 views

MySQL replication error when an event is expired and dropped automatically

I have an event that ends at 2014-01-21 10:00:00, and a replication error was caused by drop event *** statement, coz the slave complains that the event does not exist at all. A little bit more ...
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459 views

MySQL: Prevent DROP TABLE and TRUNCATE TABLE on Slaves

Can someone tell me how to prevent the following commands DROP TABLE <tbl-name>; TRUNCATE TABLE <tbl-name>; from being replicated to slaves?
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209 views

Database Mirroring and Replication in SQL Server 2008 R2

I have configured the mirroring and replication between 4 servers (A,B,C,D).i.e, Mirroring between A to B and C to D, Replication between A and C. The configuration was a success and I am able test ...
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269 views

MySql replication from 5.1 master to 5.6 slave keep crashing

I recently updated one of the replication slaves to mysql 5.6. After importing a recent dump from the master, I run mysql_upgrade with no errors. the database deamon started correctly with no ...
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1answer
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PostgreSQL Replication delay debugging

I've got a cluster of 9.1 servers running streaming replication and using WAL-E based log shipping for when that falls behind. Generally speaking it's a pretty solid setup and does not fall behind, ...
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508 views

MySQL relay log rotates too soon and too often

I have a simple master/slave setup where the slave is just a backup. Sometimes I notice that the relay log on the slave rotates too often and too soon, when it is still very small: 4:00 PM ...
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2answers
765 views

How to run a cold backup with Linux/tar without shutting down MySQL slave?

I run the following before tar-ing up the data directory: STOP SLAVE; FLUSH TABLES WITH READ LOCK; FLUSH LOGS; However, tar will sometimes complain that the ibdata* and ib_logfiles* files are ...
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99 views

Relaying changes to a slave from another master with Tungsten on MySQL

I am trying to setup a multi-master type of replication with each master having an additional slave using Tungsten. As an example, lets say I have 4 hosts (A,B,C,D) and hosts A and C are the masters, ...
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765 views

Ports necessary for Oracle 11g Replication across a firewall?

We have two Oracle 11g Enterprise Edition servers that need to replicate data via Oracle streams. However, the two servers are on untrusted domains and connect via a VPN. On end of the connection is ...
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3answers
383 views

Finding differences between a master and slave when pt-table-sync fails

I have a table that's showing some differences on a master and slave according to pt-table-checksum (PTC). I've found some verifying differences beyond that. Certain tables in the mix have composite ...
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1answer
768 views

SQL Server: subscriber as publisher and hierarchical replication

In Oracle Streams one way replication from one DB to another is a basic block for many replication topologies (N-way, hierarchical, combined and so on), and changes could be captured and applied for ...
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238 views

MariaDB Galera Cluster - nodes fail to start

This is a new installation (fresh VM and MariaDB install). For some reason, the nodes are having trouble joining the master server. The master server would pause at Preparing binlog files for ...
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SQL Server Replication: “ALTER TABLE ALTER COLUMN” is not propagated to subscribers

We are running SQL Server 2008 R2 SP1 as publisher & distributor, and SQL Server 2005 SP3 as subscriber. The replication of schema changes is activated, and the replication has been running for ...
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Updateable Subscriptions: Rows do not match between Publisher and Subscriber

I have transactional replication with updatable subscribers set up in SQL Server 2008. It has 3 subscribers and 1 publisher. I had to setup replication again due to some errors related to the database ...