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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Problem with MySQL Delayed Replication

I am testing out MySQL Delayed Replication. But it's not working. I have a Master DB (5.5) and a Slave DB (5.6) both set up as a normal master/slave setup with statement based replication. On the ...
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Query slow on subscriber but fast on publisher (Merge Replication)

As the title suggests, I am having issues with performance with my subscriber. I run the exact same query (it's a recursive query with a few joins but nothing too serious). I can run this query on my ...
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mysql ssl replication - fails while attempting to connect to master

I'm trying to troubleshoot why my slave cannot connect to the master. This is what I see in the output from the command "show slave status \G" mysql> show slave status \G; ...
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Bucardo Postgresql replication master-master windows

Is it possible to use Bucardo installed on linux PC to replicate master-master postgresql 9.4 for two windows servers.
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Replication taking too much time between requests

We are using transactional replication in SQL Server 2014 with one master (publisher), 1 distributor (dedicated server), and 3 slaves (subscribers). All writes are made to master and reading is done ...
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Postgresql hot standby what happens when Master is down

Beginner question. When Master is down hot-standby become automatic master? When old master is up what happened to hot-standby and meanwhile data insert in hot-standby how is transfer to the ...
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Merge Replication - Deleting from the subscriber database?

I have 2 SQL Server instances where I use merge replication on a database. A developer accidentally inserted data to both the subscriber and publisher at the same time. Now I have data in both ...
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Replication of Database in PostgreSQL

I want to Replicate my PostgreSQL, in the website there far too many options, I want to know which one to choose. I have a main server which the database is stored at. Inserting, editing and deleting ...
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Cannot drop distribution database in SQL Server 2012

I am trying to drop distribution database but cannot as I am getting this error: The operating system returned error 21(The device is not ready.) to SQL Server during a read at offset ...
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MySQL replication seems to work but no data is transferred [closed]

I'm trying to set up a one way MySQL replication. All sources I looked for errors seemed fine but no data is transferred. The following sites couldn't help me: ...
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In mongodb 3.0 replication, how elections happen when a secondary goes down

Situation: I have a MongoDB replication set over two computers. One computer is a server that holds the primary node and the arbiter. This server is a live server and is always on. It's local IP ...
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mysql off-site replication ( file only )

I am new to mysql, I have extensive experience with MS Access and some with Tivoli. I have tried to search the net for my solution but there is such a massive quantity of results I can't find a ...
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SQL Server distributor server move

I need to move my distributor server to a brand new server without resnapshotting it. The scenario I have is similar to the one defined in below link. ...
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Replicate only some tables of MariaDB database

I currently have a ready-made structure cluster with MariaDB Galera with two servers that keeps both updated database. However I now have the need to create a new similar structure but with one ...
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44 views

Size of Binary log file in Mysql Replication

I have a master - server replication setup in Linux servers. Master Configuration details : MySQL version is 5.1 and replication mode is MIXED type. Slave Configuration details : MySQL version ...
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Simple/Easy PostgreSQL HA multi-master for high latency / unreliable network

I have an environment consisting of two servers running JBOSS and PostgreSQL. Each server writes to its own database and programmaticly synchronises some data to the other database. This causes ...
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25 views

MongoDB replicaset config info differs among replica members

I have a replicaset running in MongoDB3.0. I did some changes to the replicaset configuration a period after the initial setup. For some reason, I have different replicaset config information in ...
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ERROR: duplicate key value violates unique constraint “repl_stat”

Error messages constantly showing up in log files and I don't know what to do with them: 2015-11-26 11:08:05 MSK ERROR: duplicate key value violates unique constraint "repl_stat" 2015-11-26 11:08:05 ...
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Galera 3 node cluster - force an online state transfer without downtime on existing node

We have 3 node Galera cluster. On node 3 I wish to force a state transfer. We have out of sync issues, because table was MyISAM. Now InnoDB. Howto do that? Delete data files and restart? The cluster ...
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51 views

MySQL - Force replication to statement for INSERT to a table to fire trigger on slave

We have a PROD DB which replicates into a slave DB using mixed replication. We want to add a trigger so that a row is added to our DW when a row is INSERTed into table_a (on master). The issue is that ...
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Incremental snapshot in transactional replication [duplicate]

Is there a way to increment the snapshot at the distributor instead of reinitalizing the snapshot every time a new table is added/removed/altered? It is taking a lot of time to generate the snapshot. ...
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Galera cluster: fix out of sync tables

I have a table XXX, this table has on all 3 nodes different number of records. This table uses auto_increment key. I wish to resync this table from master to slaves. # yum install ...
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How to setup SQL Server 2014 replication for a demo site

Background: We have been looking at replication of our SQL Server 2014 databases for a couple of scenarios.One which just works and its hunky dory and the other which just doesn't seem to work, ...
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63 views

How to delete duplicate rows in merge replication

Somehow two rows in a table that is party to merge replication are identical, including their rowguid. I have no idea how this happened, it is only with two rows in my entire database (which is used ...
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44 views

Rebuild master database only in sqlserver 2012

How can I rebuild system database master only when I rebuild system database. Is it possible?
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44 views

Restoring a replicated SQL Server database in a non-replicated testing enviroment

Sorry in advance if this is already answered, but it's quite difficult to search exactly what I need. We have a SQL Server 2008R2 DB in Production. Originally, the DB didn't have replication. Every ...
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20 views

How to disable replication when Distribution db is lost?

I am in the situation that the Distribution database in SQL Server 2014 is lost and I want to disable the replication. I have found a solution how to achieve that when data files are present (also ...
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Semi synchronous Replication passes no data

My master is running MySql 5.6.19, one slave is 5.6.27 and the other is 5.6.21. Everything seems to indicate that replication is running properly, but data on the slaves is not updated. My status ...
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What about redundancy if distributor goes down?

I'm setting up load balancing, transactional replication and mirroring. However, what I actually thought might work from the beginning, making the system redudant doesn't actually work because a ...
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39 views

How to Set Up Sync of two mysql databases without master slave

The purpose is to create the live database replication for staging server but with masking of personal identifiable information like email, mobile, passwords etc. This has to be done once daily, not ...
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Mysql sync_binlog = 50 and innodb_flush_log_at_trx_commit = 2 with replication

I'm looking into sync_binlog = 50 and innodb_flush_log_at_trx_commit = 2 to improve write performance. There is this question, but it doesn't address the specific problems with replication. I have an ...
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MySQL 5.7.9 multi-source replication

I am trying to set up multi-source MySQL replication. I need to replicate only one database to one slave instance and another database to another slave instance. If I use replicate-do-db in master it ...
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MongoDB Replica Set Failure

Some background I had an issue with my replica set the last 24 hours, where the members could not connect to each other, and I got errors such as; could not connect to .... the machine actively ...
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41 views

Modify Script to not include *_snapshot_* databases

We use the script on the website below to script out replication. I would like to add a exclusion of databases that have a name _snapshot_ in the name of the database. ...
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Attach replicated .MDF file with/without log after OS reinstalled [Reposting in right forum]

I have SQL Server 2014 DataCenter RTM Version on Windows 2012 Standard Edition for about 2 months and had migrated a database from SQL Server 2008 R2. The database had transactional replication was ...
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Mysql time shifed replication

We got a system with a Mysql database and a replication on a slave database. We got huge uploads, which will do major changes to the master database. We want to keep the slave database the old version ...
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SQL Server : distribution agent error

In my transactional replication setup, the replication monitor keeps printing this message every 5 mins: Agent XYZ is retrying after an error. 35 retries attempted. See agent job history in the ...
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MySQL Multisource slave as a master?

When deploying MySQL multi-source replication, can the multi-source slave be a master for other 'normal' slaves? I can't find this particular case covered in the documentation
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MySQL Replication Query

Imagine I have three servers. x.x.x.31 - master x.x.x.32 - slave x.x.x.33 - slave If I run a simple update in master. What does the slave servers done. run the update command or copy the updated data ...
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62 views

Redis remove slave from replication along with sentinel

I have a 3-nodes Redis replication and a 3-nodes Sentinel. I want to remove one slave. I tried stop slave and remove slaveof 10.128.130.139 6379 from configuration. But it became slave again after I ...
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DBClientCursor::init call() failed

During syncing a slave(SECONDRY) node, I have DBClientCursor::init call() failed error and it's start syncing from scratch, the full log is provided: Tue Nov 10 05:54:56.281 [rsSync] clone ...
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Mysql replication issue

I added a new replication user to my slave db and accidently spesified the master_host in the change master statement (without specifying the log file and pos). However, its the same master as before. ...
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Triggers on Slave database (in the context of replication) for auditing purpose in MySQL

I have a requirement for auditing in MySQL database. It means I am interested in what data is changed in my database and when. For fulfilling this requirement I am thinking about the triggers. I am ...
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52 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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46 views

Can I add an Arbiter node in the same server of my Config-Server?

I'm using MongoDB and I want to know if I can add an Arbiter node in the same server that I'm hosting my Config-Server. Is it possible? Let's say that I have 3 sharded clusters with 6 servers (2 per ...
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Is there replication by “pushing” instead of “pulling”?

Here is the situation: pg 9.4 pg instance "A" in intranet which is often loosing connection with WAN because of satellite problems (primary). This server has dynamic public ip. pg instance "B" ...
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Prevent SQL Server publisher from running out of disk space

I have an issue with transactional replication which leads to running out of disk space. The scenario is following. Database A is replicated to another computer via local distributor with command ...
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Mongodb slave shut down

i started a mongodb master slave but due to technical issues the slave server crashed. I restarted it and the mongod proccess as well with the host parameter, but for some reason the slave isnt ...
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107 views

MongoDB replica set: members with different versions of mongod

The primary is running mongod 3.0.6 and the secondaries running mongod 3.0.7 is a mixing of versions allowed in the same replica set? For upgrade it's best practise to not all nodes the same time. ...
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When one of masters is unreachable all other replica sets work too slow in mongodb 2.6.11 and web application throws error 71

When one of masters is unreachable all other replica sets work too slow in mongodb 2.6.11, also I can not list the databases on mongos servers, and that is because of one replica set. How to solve ...