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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Automatic failover in Mysql 5.6 [on hold]

I have to perform the Master-Slave Replication in Mysql5.6 with automatic failover Option.Please help be to achive this. Coming to my setup i have 4 Mysql Instances running on single server.Now i am ...
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Postgres Streaming Replication: How to re-sync data in master (with standby) after failover

I am absolutely new to postgres 9.1 replication mechanisms. I have managed to set up streaming replication between a master and standby postgres (Both have x number of records). At one point when ...
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22 views

Transactional replication of stored proc execution and stored proc parameters

I'm trying to design how we might go about setting up replication of just the execution of a stored procedure. If the stored procedure on the source takes one or more parameters, will those same ...
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Can SQL Server Transactional Replication do this?

We have a production server and a reporting server, with transactional replication in place to move all inserts/updates/deletes from production to reporting. We're using SQL Server 2008 R2. We have ...
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43 views

Transactional replication between SQL Server 2014 (Publisher) and SQL Server 2012 (subscriber)

We need to set up transactional replication between two servers A and B, configs listed below: Server A (Publisher) Microsoft SQL Server 2014 - 12.0.2254.0 (X64) Enterprise Edition (64-bit) ...
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Replicate SQL Server tables between AWS RDS instances

We are running an RDS instance in AU region and would like to replicate some tables to RDS instances in other regions. A lag of a few hours is acceptable between master and slaves. As we're on RDS ...
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23 views

MongoDb replica set: How do I verify data replication on other servers?

I have a 3 member replica set running. It's geo-located on 3 separate VPSs. On primary I can do rs.status() and see it's working. I can't execute any mongo shell commands on the secondaries. How do I ...
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13 views

How to manually invalidate a pull merge replication snapshot from the publisher

XY Problem background info: I have a pull replication publisher in which I want to add or alter a index and have those changes be applied to the subscriber. The solution to that problem I would like ...
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15 views

Heroku Postgres Follower

I'm currently looking at creating a follower db of a live production database. The follower will be used for analytics purposes only. And will not be inserting any data - if it did then it would be by ...
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18 views

Insanely slow replication after MHA promotion

I have a replication setup with 1 master and 3 slaves. I promoted the current master to one of the slaves using MHA. That went seemingly flawless, not errors reported, everything marked ok. Spot ...
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16 views

Mongodb replica set across AWS regions or subnets or data centers

I seem to have run into a blocking problem. I want a certain collection to be replicated across multiple AWS regions/subnets/data centers (eg a global lookup table or a global user credentials table) ...
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46 views

What are some known hazards with cyclical replication between two MySQL master servers?

If I were to set up cyclical replication between a MySQL 5.6 master server and a MySQL 5.1 master server, what are some things that could potentially go wrong? Also, the 5.6 MySQL does not have GTID ...
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MySQL GTID replication: is it possible to make DDL changes to a slave and then catch it up to a master?

Here's what I would like to do: 1. hang a slave off my production master. 2. stop replication 3. adjust some data types and create some indexes on the slave (no data mods) 4. restart replication 5. ...
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1answer
24 views

Duplicate delete query in binary log of MySql Master

We are facing strange problem, while replication data from master to slave. Same data is being deleted twice in log(How ever only one row is deleted and one time),due to which we are getting error ...
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26 views

Write-lock a whole table during transaction

I need to perform a delicate operation to my table in which I will solely insert, delete and select upon all of my rows and no God may interfere with the table during this operation: the table will be ...
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1answer
25 views

Mysql's internal mysql database in replication

I searched around but the word game seems to delude any valid result and could not find anything relevant. Mysql (the RDBMS) has an internal database named mysql, this database has information about ...
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59 views

Transactional Replication in SQL server 2014

We need to set up transactional replication in SQL server 2014, Enterprise edition so that: Database to be replicated from Publisher which is approximately 2 TB in size. This would be used 24*6. Here ...
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37 views

SQL Server 2008 R2 Replication not working - my 1st try

I am having difficulties when I attempt my first shot at SQL Server 2008 R2 Replication. Looks like I have login issues. How do you modify settings without having to start a new plan again? Please be ...
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29 views

percona cluster 5.6 - handshake with remote endpoint failed, but endpoint is not part of config

I set up a cluster of 3 database nodes using a percona 5.6 cluster. Everything works, all nodes are replicated. I configured SSL for state transfer. The cluster recently changed its topography, ...
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Replication slowness: massive MSrepl_commands table?

Background: I have a SQL Server 2005 transactional replication setup that pushes normal traffic fine, but occasional larger processing batches have been a problem. Obviously the changes take longer ...
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20 views

Mysql: How does circular replication avoid infinite looping of a transaction

In case of circular replication A -> B -> C -> A. How come a transaction started on A will be ignored from being replicated from C to A at the end of one complete cycle ? I believe parent server-id ...
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30 views

Percona MySQL 5.6 databases ignoring key length at constrait creation

We have a 3 servers running Percona MySQL 5.6 in a Master/Master configuration that are all reporting errors on key length, either too long or not specified. The structure of the databases is all ...
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MySQL error 1593 on replication between 5.0.92 and 5.5.42

I'm migrating a server to new hardware and trying to set up replication to keep the site current until we switch DNS. The intention is to enable two way replication to make sure that the servers stay ...
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Find unpublished columns via RMO

The stored procedure sp_helpmergearticlecolumn will return all columns for a table and have a bit set if the column is published or not. The MergeArticle RMO object has the function ...
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Postgresql Hot Standby - How to determine it's fully mirrored?

I have set up a hot standby of a postgresql server. It all seems to be working, but I just want to be sure that I'm not missing something. In /var/lib/pgsql/9.2/data/pg_log/postgresql-Wed.log I have ...
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On triggers and replication in MySQL

I have a classical statement-based replication between the master and the slave. Triggers were created on the master and replicated on the slave as well. Assuming that I have, say an ON UPDATE ...
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26 views

MongoDB : How to estimate max number of connections supported?

We have a sharded cluster with 2 replica sets. Each replica set is a 3 member cluster with one primary and 2 secondaries. Each instance is a r3.large (aws-ec2) instance with 15G ram. mongos's are in ...
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47 views

no pg_hba.conf entry for replication connection from host

(Also posted to pgsql-general) I have been configuring a slave server that needs to connect to the host. Both the master and the standby servers have a pg_hba.conf that looks like this: # Allow ...
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24 views

How do I know Postgres streaming replication is working?

I have set up a standby server to follow a primary Postgres server following [this wiki page][1]. The issue is that I am not sure the primary server is sending anything to the replica because I don't ...
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Vague replication error code 2005

2015-04-07 13:49:53 23758 [ERROR] Slave I/O: error connecting to master 'replication'@master-host:3306' - retry-time: 60 retries: 1, Error_code: 2005 This was after attempting to do a change master ...
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29 views

Replication Lag on Postgres AWS RDS Service

We have a single master/single streaming replica Postgres 9.3 db on AWS. The load is not terribly high - this is a development/staging environment. (The production shows similar metrics). Point is the ...
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Copying MySQL Raw Data Files for Master-Slave Replication and GTIDs

I have been developing and running a mysql-based web application (intranet-based) for some time now. I wish to establish a step-by-step sane sequence for creating a slave from the running MySQL ...
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36 views

How to avoid MySQL slave to have errors after crash

I have a MySQL master/slave configuration (MariaDB 10.0.17). Sometimes, the slave or the master server crashes. After the crash and restart, I get some errors of duplicated keys on slave. The server ...
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45 views

Size of data in secondary exceeded primary after its initial resync from primary in MongoDB

I step down the primary node, deleted its data and performed the initial resync from new primary. But when i checked the size of data after the completion of initial resync, I found that the size of ...
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1answer
32 views

Data mismatch on Subscriber Database in SQL server transactional replication

We have Transactional replication set up between an OLTP Database server 'A' and reporting DB server 'B', where the Data from OLTP DB(Size 400 GB) "AR" is getting replicated on the server B as ...
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33 views

MySQL replication - ibdata1 huge

I'm trying to implement MySQL replication in production after I successfully implemented it on my dev environment. Basically, what I did is export the dump using the following : mysqldump ...
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22 views

MySQL: Replicate data within 2 same schemas on 1 mysql server

This might sound a bit crazy, please let me explain the reasoning behind this: we plan to use a real master-slave replication for production we want to use something small'n easy for local ...
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30 views

MySQL Crash After Starting Binary Logs

Recently I have added binary logs to mysql to start replication but after that setting, mysql process failed to start and keep crashing constantly. In mysql error logs some messages are there but not ...
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50 views

Hi disk I/O and crash when turning on sync_binlog in MySQL

I have a MySQL master server (MariaDB 10.0.17) that have a very odd behavior. It has one slave fetching data from it. When I set global sync_binlog = 1, the server I/O goes very high and after some ...
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87 views

postgresql bdr 0.8.x - adding another downstream server only partially works

I have the following postgresql 9.4 bdr setup: upstream server with db called "bdrdemo" running on 10.1.1.1 downstream server(1) with db called bdrdemo running on 10.2.2.2 (replicates with ...
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Couldn't setup postgresql cluster with heartbeat pgsql ra

I'm trying to install postgresql cluster with the following configuration: 2 virtual hosts with RHEL 6.6 x64: postgresql 9.1 with hot standby replication pacemaker 1.1.12 resource-agents 3.9.6 I ...
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SQL Server 2014 Replication - The process could not connect to Subscriber 'xxx'

I have just set up very basic transactional replication on SQL Server 2014. The Publisher and Distributor are one and the same. I have configured the Publisher to push to the Subscriber, so any and ...
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23 views

Can I setup database triggers to run on a defined secondary set of servers only? [closed]

This might sound a bit off, but here's what I have been thinking for a while now: Use Case You want to build an activity log for each user action on your application using database (postgreSQL) ...
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43 views

Change MariaDB 10.0.17 (MySQL) master to a slave

I have a MySQL master/slave configuration -------- -------- | master | -> | slave1 | -------- -------- I want to kill my current master, transform slave1 to be the new ...
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Error on slave2 after promoting slave1 to master in cascaded streaming replication

I've a setup like MASTER -> SLAVE1 -> SLAVE2. MASTER and SLAVE2 are running on different ports on single server. SLAVE1 in on another server. For testing purpose I've powered off my first server ...
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23 views

Slave executing queries with different charset

I need to change a database charset because of this issue and I solved my issue in staging environment with the SQL command ALTER TABLE `articles` CONVERT TO CHARACTER SET utf8 COLLATE ...
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Setting up replication for various mongodb micro instances

We currently have 5 mongodb micro instances on aws, each of them serve different modules and the calls are made through REST services. We are planning to setup replication for these instances and my ...
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Replicated databases across locations; delay in application

I have a replicated instance of database on different locations different SANs which is utilized for running a vendor supported application. However, I notice that there is a significant delay between ...
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21 views

MySql Replicate different tables to different database

I have Database1 on server1 and Database2,Database3 on server2. Database1 has two tables T1, T2. I want to replicate T1 on Database2 and T2 on Database3. How can I accomplish it? I googled but only ...
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How to sync postgres roles between multiple servers

I am looking for a solution in which I can replicate the details of a role (most notably the password) between various postgres servers. (All running the same version). The idea behind this is that ...