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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Database structure setup

We're currently in the process of moving our hosting services to something which will allow us to scale our infrastructure and requirements. Essentially we're using MySQL to: Run our websites. Run ...
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MySQL replication mystery

May I ask if its possible to have a table on Slave server. But it does not exist on Master Servers? how come this one happens? Thank you.
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31 views

MySQL Cluster Replication Merge

We'd like to have two MySQL cluster groups, and at the same time have replication set up between them. Is that possible?
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90 views

Offsite Log Shipping

We currently use CDC to replicated our Production DB offsite (Microsoft SQL Server 2008 R2), but using CDC and the way we process the files is very unstable. Also note that the two servers cannot ...
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17 views

Does Galera Cluster rsync only updated files or all files

We're currently setting up a galera cluster using rsync for sst. The datadir is currently 20Gig and right now we're only updating about 4 (very large) tables. I know that rsync normally only ...
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56 views

Best database replication technique for a very unstable (power wise) network

I am part of a small network (500 users) who are all connect via WiMax to each other. The people connected to this network live in about a 70 km radius. This network allows for a transfer speed of ...
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50 views

SQL Replication With Always On Availability Group

We have an always-on SQL 2012 availability group with two replica servers and an AG listener. Doing merge replication via anonymous subscriptions through IIS between SQL and multiple remote clients ...
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23 views

mysqldbcompare showing AUTO_INCREMENT differences but there are no missing records

I am encountering a strange issue when using mysqldbcompare to compare two MySQL DBs(one is a master, the other its slave). I noticed that the tool notes that the AUTO_INCREMENT values of this ...
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102 views

How to solve MySql Slave Error 1452 Foreign key constraint fails?

I am site administrator. We use to have a mysql 5.5.40 master(db01) - slave(db02) setup. One day our master server (db01) got down due to hardware failure. So we switched our site to slave (db02) ...
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19 views

Replication lag is causing issue on one shard

I am running a mongo db sharded cluster with two shards. Each shard has one primary, one arbiter and one secondary. On one shard I am facing an issue with replication as it is showing this result ...
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68 views

Best practise how to sync SQL Server 2014 database with other database

What is best practise if we have application using a SQL Server database and we would like to have backup if SQL Server does not work? Our scenario: We would like to use our main SQL Server ...
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23 views

Mysql Multi master replication - auto_increment for tables with natural primary key?

I am thinking about using Master-Master replication using Mysql 5.6.19 with InnoDB as the engine. From what I have been reading, looks like I should be using auto_increment_offset and ...
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50 views

ALTER TABLE blocking in MySQL 5.6

I have a question with a MySQL 5.6 master-slave setup. If I were to modify the master's schema with an ALTER TABLE SQL query, then when the slave tries to execute that ALTER TABLE statement too, would ...
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17 views

I couldn't see Conflict tables in replication monitor SQL Server 2008 R2 in Merge Replication

I work with merge replication in SQL Server 2008 R2. In the replication monitor I can't see conflict table, I must to see conflict tables in "MSmerge_conflicts_info", please help me. How to see ...
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281 views

Transaction Log won't shrink, DB thinks it is replicating

I've got a SQL Server 2008 R2 Express database running Kaspersky Security Center, and I have no idea under what circumstances the install happened, but the database appears to think that it's being ...
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1answer
74 views

SQL Server 2008R2 - how to install replication components

I am trying to install the Replication components for SQL Server 2008R2, on technet website it says: On the computer that is running IIS, insert the SQL Server 2008 R2, SQL Server 2008, or SQL ...
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88 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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44 views

MongoDB replicaset number of connections too high

I'm using a 3 node replicaset with 2 data nodes(version 2.6.1 and 2.6.3) and 1 arbiter node. I get frequent alerts on number of connections >1000, whereas total databases are about 400 and also I'm ...
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19 views

MYSQL Group Replication

I have setup a Master-Master-Slave replication where say A B and C, I want to replicate data from A to B (which is working) and B to C (also working) and from A to C which is not working with two ...
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26 views

Question on turning on GTID for MySQL master and slaves

I came across the interesting article by Facebook's Engineering team where they were able to deploy GTID in MySQL at a large scale : ...
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25 views

Is there a way to replicate certain part of collection in Mongodb

Is there away to stream certain part of collection in MongoDB or TokuMX from master server to another server? I need to duplicate only certain collection Or if it isn't possible, are there any other ...
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1answer
18 views

Multi-master synching in three geographically separate datacentres

Our company needs to create an application that operates in all parts of the world. We are looking to have three servers (one in Europe, one in Asia and one in America). I'm looking to use ...
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34 views

Postgresql - Streaming replication - STONITH

Current situation: PostgreSQL, streaming replication Master failed, I created the trigger file. Slave is promoted to new master After the old master restarted successfully, I have to create base ...
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41 views

Problem Getting Simple Replication to Work in SQL Server 2008/2012

I can't resolve a problem with replication. The publisher/distribution side seems just fine, but when I subscribe and view in the replication monitor I always get this error: "a required privilege is ...
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Can any one Explain me What is the Use of Cascading Replication in Postgresql?

What are the advantages of cascading replication in PostgreSQL. I have done Testing On this With three nodes. M1---->S1----->S2 What is the Use if My master(M1) goes Down(failover). Where the ...
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619 views

Strange MySQL replication error 1146 (Table doesn't exist)

I'm getting a very weird MySQL replication error No. 1146 for a REPLACE INTO query on a slave host replicating all tables in all databases from a master, and I'm having a bit of a hard time ...
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Sudden (and drastic) decrease in commands/second on replicated slave

On a slave that uses statement-based replication from a failover of master (all running mysql 5.6), the number of queries executed per minute has suddenly decreased from ~20k during peak traffic to ...
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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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27 views

MySQL rapid Data Replication from multiple Databases

I am a Freelance Web Developer but not a Database Administrator at all except basic Database Operations like DML etc. Today I got a client asking me to develop a Web based application but there is a ...
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14 views

Replication on same physical server [duplicate]

I am new to DB. We have galera cluster on Test environment where mariaDB is replicated in 3 servers. Now customer want us to work with only 1 server. they cant provide 3. Can we do replication on ...
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19 views

MySQL Remote Database Failover: Need Advice

I run a network of sites all on 1 server. To improve performance, I'm (finally) moving the MySQL database to a remote machine. I'd love anyone's advice on how to appropriately approach failover. ...
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43 views

Reset relay files on lagging slave after MySQL crash signal 11?

MySQL crashed on this slave server with signal 11: Error reading packet from server: Lost connection to MySQL server during query ( server_errno=2013) Slave I/O: Replication event checksum ...
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1answer
26 views

MySQL Circular replication with fail over

I have 3 MySQL servers which is running with circular replication. Server A version - 5.5 Server B version - 5.6.21 Server C version - 5.6.21 Master Server FOR Slave Server C ...
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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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47 views

Laggy slave OK to have only one system user in processlist?

In all the examples of a processlist on a mysql slave I've seen, there are two system users. I have a slave that is very far behind the master. When I do show a processlist, there is only one system ...
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64 views

Replication consistently fails to bring new rows to subscriber

Short description of the problem: Initial synchronisation to the subscriber works fine. Subsequent synchronisations fail to download new rows. Re-initialising the subscription "fixes" the issue and ...
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55 views

MySQL Master-Master-Slave failover

I have setup a Master-Master configuration in MySQL with one additional slave, like this: Master1 <-> Master2 <- Slave Master1 is the write master used by my application, Master2 is used ...
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32 views

SQL Server 2008 R2 - Replication - Multiple Publications on a single database

I have hit a problem and I need an idea of where to look or how to resolve. I have setup a publication and 2 subscriptions to it, 1 running on a schedule and the other running continuously. I need ...
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Checking for replication options

I have a master/master setup with one DB in each. DB name and tables in one server are different from the other, and few 'user' tables are being replicated with the option replicate-do-table. (It's ...
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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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36 views

Data on the slave becomes inconsistent after couple of days

We are planning on upgrading our production MySQL server from MySQL 5.0.77 to Percona 5.6.19-67.0. Since our downtime window is small, we setup a slave of the production master on a new host and ...
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93 views

DB performance vs replication

I am working on a db optimization (planing for future project growth) and need some help. Currently, every table is using uniqueidentifier as PK (clustered index) and we have high index fragmentation ...
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129 views

Postgresql doesn't accept replication connection

Plain old streaming replication. PostgreSQL: 9.2.7 Windows 8.1 64 bit My primary and secondary clusters are on same windows machine. I have already done pg_start_backup() and everything, so both ...
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How can I avoid breaking Postgres sync replication when building a large index?

We have pairs of Postgres 9.2 servers using synchronous replication. Sometimes rebuilding an index on a large table will break replication due to WAL segments not being kept around long enough. We are ...
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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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48 views

mySQL Master not getting data from slave

I have followed the instructions on the Web on how to set up master-slave mySQL replication and I have spent a day and half trying to get it to work. The master is simply not getting new data at ...
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36 views

Lock Master Log Position in Master-Master replication

I have two servers connected via private IPs. Replication is partially working, however the problem I'm running into is when I change the MASTER_LOG_POS on Server B using Server A's SHOW MASTER ...
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35 views

SQL Server 2008R2 - Replication - Log Files / Indexes

We have 4 SQL Servers engaged in Transactional Peer to Peer Replication. I am doing some work on the Indexes and have noticed 2 things I didn't expect: The Indexes have different fragmentation ...
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MySQL - How to see the queries executing by slave io thread

We have a strange problem with MySQL replication. We have observed huge load and IO wait on server while replication is in progress. We can have information of the queries from bin-log by using ...
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Differing AUTO_INCREMENT values between 5.1 vs 5.6 slaves

I have a MySQL 5.6.21 slave and a MySQL 5.1.73 slave that are both replicating from the same MySQL 5.1.73 master. I noticed that for several of the tables ( I said several because when I try to rerun ...