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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487 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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444 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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26 views

Peer-to-Peer Transactional Replication Load Balancing in MS SQL Server

I'm looking at Peer-to-Peer Transactional Replication and it looks like a perfect fit for my requirements, but there's one unclear part - load balancing (see picture below). How it is implemented in ...
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228 views

Consolidated realtime mysql backup with master/slave setup or binlog

I have 20+ mysql servers and their have low write requirements. So, I want to see if any way I can replicate the data/binlog from these servers to a single slave so realtime backup purpose. If I ...
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9 views

What will happen when manager stops on source in goldengate?

As per my knowledge, manager is responsible for handshaking between source manager and target manager. Communication between the extract and pump process for providing reports Is there is a ...
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6 views

Failover_command in pgpool is not working?

I have setup the pgpool with load balancing and failover mode. Following is my failover_command='/usr/local/etc/failover.sh %d %P %H %R' The following is the script: !/bin/bash -x FALLING_NODE=$1 ...
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25 views

How does SIOS Data Keeper make consistent backups? [on hold]

We are looking to change our DR solution to get our RTO and RPO as close to 0 as possible. We have around 80 databases on SQL Server 2012 sp2 that come to about 1TB in total including log files. I ...
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1answer
78 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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2answers
24 views

MySQL replication - how to read from slaves? manually?

MySQL Manual - Replication: "Scale-out solutions - spreading the load among multiple slaves to improve performance. In this environment, all writes and updates must take place on the master ...
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1answer
587 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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1answer
21 views

MySQL Replication Master Slave Architecture - Web app that is based on the SLAVE DB

We are developing a web application (Spring mvc based app) that uses a MySQL DB. (lets call it the "original app") The DB architecture uses a MASTER-SLAVE configuration with replication. The web app ...
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11 views

MySQL Replication, Can i add a trigger to the SLAVE db?

Is it possible to do so? The trigger will insert some rows into a unique table that exists only on the slave.
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116 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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5 views

How to handle private local databases in a multiDB cloud environment

In context of Platform as a Service (PaaS), we would like to offer our clients a private platform. A platform includes a website and a database. A platform is not 100% separated. Users could "travel" ...
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1answer
182 views

Mongo DB Replica set Stuck at RECOVERING state

We have created a replica set and now the problem is 2 members of replica set [3 members set] are in recovering mode from 48 hours. Initially the size of recovering nodes was increasing and now even ...
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1answer
230 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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2answers
17 views

Postgresql 9.4 high availability

I currently have a master postgresql 9.4 server containing many databases on Ubuntu 14.04. I tried to use Barman to setup backup, but would like to set up streaming replica so that when the master ...
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1answer
379 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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485 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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30 views

'accidentally' set 'CHANGE MASTER TO' on wrong server

while setting up the replication I accidentally did the 'CHANGE MASTER TO' on the master server instead the slave. When I noticed the mistake I just did a 'STOP SLAVE' on the master and setup the ...
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1answer
112 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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1answer
543 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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1answer
285 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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1answer
30 views

federated tables? synchronization? replication? [mysql]

I have a REMOTE suppliers table with, lets say, a code and a name, and several client databases will be creating new suppliers. Server database code | name ______________ 1 | Mark 2 | ...
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1answer
27 views

Mysql master master with high latency

We have a single master setup with many slaves in germany and some slaves in australia. To have faster writes in australia we want a master-master setup between germany and australia. Read slaves ...
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9 views

Transactional Replication to a Version Two Versions Older--Count by Name or Number?

According to Microsoft SQL Server documentation, a "Subscriber to a transactional publication can be any version within two versions of the Publisher version." In this context, are versions named ...
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187 views

MySQL incremental backups per database (not global)

While searching for free/open-source MySQL incremental backups solutions I have found a number of ways to do incremental backups and all of them seem to either rely on "logical" way of backups/restore ...
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409 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
231 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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3answers
419 views

Initializing Transactional Replication From two Different Database Backup

I have two different large Database (200GB for each) which I want to replicate their data to a central database (3rd DB). I followed this link and it was very useful for a single database. But my ...
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8 views

Error while doing in replicaset in windows (mongodb)

I tried doing the replicatset in windows, but im getting the below error. I checked the mongo process and killed the existing process. Even though the error exists. help me on this pls Thx ...
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15 views

How the statement based replication works internal on secondary node of mongodb?

Mongodb supports statement-based-replication. Would like to know, how the statement based replication converts the code internally on secondary node of mongodb. Is that working related to the ...
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3answers
179 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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15 views

Is Automatic failover is possible in pgpool?

I have setup the 2 PostgreSQL 9.4 severs with master-slave(Hot standby streaming replication).Is this possible in pgpool-II 3.4 to configure,where it works for automatic failover(network or hardware ...
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1answer
29 views

Replicating to Older Versions of MS SQL Server

According to an old MSDN article (from the SQL Server 2008 R2 era), Microsoft SQL Server transactional replication subscribers need to be within two versions of the publisher. Does this hold true for ...
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1answer
23 views

Are CREATE INDEX statements replicated in row-based Mysql Replication?

I've not been able to find a simple explanation of what kinds of statements are or are not replicated from a master db to a slave in MySQL, row-based replication. Specifically I want to add a ...
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1answer
3k views

MySQL 5.1.66 SSL connection error ERROR 2026 (HY000)

UPDATE2 Using WireShark I found out the problem string (I hope I did): 28 | 9.582638 | 192.168.18.128 | 192.168.18.129 | MySQL Response Error 1043 And the error is (according to docs): Error: ...
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1answer
832 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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2answers
354 views

Snapshotting Database Tables

I have a reporting database (in SQL Server) that takes nightly snapshots of the production data (Oracle) for users to query against for the next day, but now the requirement is getting to be that they ...
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2answers
3k views

Mongo replicated shard member not able to recover, stuck in STARTUP2 mode

I have following setup for a sharded replica set in Amazon VPC: mongo1: 8G RAM Duo core (Primary) mongo2: 8G RAM Duo core (Secondary) mongo3: 4G RAM (Arbiter) Mongo1 is the primary ...
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1answer
700 views

slow writes on percona / mariadb server only when replication is running

Hi I am trying to migrate to percona server from mysql 5.6 on windows. In my development machine for percona is running of centos 6.5 which is installed on vmware 5.5 sphere. Our business ...
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2answers
2k views

MySQL Replication Lag Behaving Erraticly

I've got a vanilla MySQL replication, using "MIXED" mode. The mysql slave lag calculation behaves very strangely - one moment it is 0 and the one after it it's 3630 seconds (or a similar number), ...
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1answer
145 views

MySQL replication using a lot of IO

I'm having big troubles on a database pool I've setup recently. There is a master, and 4 slaves replicating one DB. All using MyISAM engine. Thing is, during the replication period (when the slave ...
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2answers
3k 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
30 views

MySQL Master not sending events to another Master

We have Master-Master Replication and it is configured correctly as it transmit data for certain period of time and after that it does not send further events till we stop/start slave on both nodes. ...
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1answer
15 views

Why does most Galera cluster documentation recommend having at least 3 nodes as the typical set up?

The Galera documentation and most experts implementing this type of setup, recommend having at least 3 nodes in the Galera cluster. What is the reasoning behind this? Is a cluster setup with only two ...
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12 views

noobie to streaming replication in postgres 9.2

I've been asked to reverse engineer an app that uses postgresql in the back end. I can see that there is some database replica tion going on... based on my reading, I *think it's called streaming ...
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798 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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1answer
1k 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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10 views

How to block messages from Londiste?

This question is part postgres and part londiste. I have successfully upgraded PostgreSQL from 9.1 to 9.3 using Londiste. However, in the PostgreSQL 9.3 log, I am still getting some messages related ...