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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Error to connect mongos when trying to create replicated sharded cluster

I'm trying to create an replicated sharded cluster in mongodb. Initially I've created two shards and there are a replica set with three members in each shard. And all the shards and replicasets run in ...
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173 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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32 views

Cannot start SQL Server replication as already running

I'm trying to configure a sql replication on the sql server 2012 . I am logged in as "sa", when I attempt to start replication i get the following error : How can I stop this job and restart the ...
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92 views

pt-table-checksum and row-based replication

The set up I work with is MySQL 5.5 in a master-slave replication configuration, but we have to use "MIXED" replication (statement and row-based) because we use an application that requires it, and it ...
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33 views

MySQL replication working fine, but still shows “Waiting for master to send event” at 280000 seconds

To repeat the title: MySQL replication working fine, but mytop still shows a thread "Waiting for master to send event". It has been like this for a few days, and is now at 280000 seconds. But ...
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45 views

Safely changing innodb_buffer_pool_size on MySQL replication master?

We have a MySQL server which is a replication master. We need to change the innodb_buffer_pool_size and innodb_flush_method to (hopefully) improve performance as the database has grown. What is the ...
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36 views

Is there a MySQL setup for my use case?

I have multiple nodes that are mostly independent of each other, meaning 99% of traffic is reads to data contained inside themselves, plus some writes that need to be instantly available for the node ...
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38 views

What are alternatives to Replication to distibute data (Microsoft SQL Server)

Is anyone knowledgeable of alternatives to SQL Server replication? I have a scenario where separate databases will share a lot of the same data which complex queries will match against. We want to ...
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2answers
31 views

mysqld is not producing binary log

I'm trying to understand why mysqld is not writing binary log anymore... [root@ip-10-179-155-214 mysql]# grep ^log-bin /etc/my.cnf log-bin=mysql-bin [root@ip-10-179-155-214 mysql]# ll mysql-bin.* ...
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19 views

Postgres sync database

I have two postgres databases. Master = master_database Slave = database All initial changes are made to master. Upon admin approval, the version is updated, and I want all changes to be copied ...
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1answer
23 views

Sync MySQL 4.0 table to MySQL 5.6 server every few minutes

I am tasked with getting a copy of a table on a MySQL 4.0 server synced to a completely different database on a MySQL 5.6 server every few minutes for the purposes of having that table available ...
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38 views

Postgres multidisk master replicating to single disk slave

I have an odd situation. I have a postgreSQL database master with multiple large tablespaces divided across 3 physical disks. I am setting up a slave that will be used to offload long, ...
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11 views

Replication is broken because of events in wrong order in binlog

I have a master-master replication which is used rather like a master-slave because of replication breaks from time to time. It is always broken on the same table. To find the reason on this problem I ...
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1answer
52 views

Centralized master data shared among other several DBs

I'm researching and investigating about all possible ways to create a master data database for my portfolio of applications. To give you a quick overview, an example will come in handy: I want to ...
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18 views

MySQL Chain Replication without log-slave-updates

I have three server's say A -> B-> C B as both Master and Slave.I have enabled log-slave-updates in B server so that replication is possible on C. So what if happens when log-slave-updates is not ...
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1answer
42 views

PostgreSQL Automatic Failover (Trigger File Creation)?

Is there a way to detect if the master PostgreSQL (9.3) server becomes unresponsive, and if so, create the trigger file (that is specified in recovery.conf) that initiates the failover process? Or ...
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26 views

Sync/Replication of 2 Oracle Databases with NetApp storage

I am working on a high availability setup of Oracle Enterprise Manager. I need the back-end repository replicated (preferably in real time, or something close) to another repository, in which I could ...
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1answer
47 views

MySQL replication error 1594

Is there a way to restart replication without going over MySQL :: MySQL 5.1 Reference Manual :: 16 Replication. I'm NOT seeing ANY errors on master and I'm not entirely sure why slave is ...
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1answer
24 views

Upgrade mysql from 5.0 to 5.5 in master-master configuration leads to broken replication

We created two new mysql servers running 5.5. Our old server were 5.0. The two servers are set up with master-master replication - this was the case for the two 5.0 servers which had no issues. We ...
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1answer
22 views

Mongo DB - reading during update

Is it possible in a three-member-replica set (1 primary, 2 secondaries) to update records on the primary, or even delete several records and insert the updated data, and still execute read-ops on the ...
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1answer
42 views

RAID drives or replicate data?

I have an old Microsoft SQL server that, for financial reasons, I cannot replace until later in the year. The OS, DB and temp files are on one 10k RAID 5 array (I didn't design it) The server is ...
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3answers
42 views

How to auto replicate specific columns only from a table in MySQL

I want to make one master DB which replicates specific user data into other databases such as: username pass (hashed) email pin (hashed) timezone (int) They are all in one table and running on ...
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Can it Possible to do Mysql Active - Active Replication between Redaht linux 6.4X and Ubuntu 12X?

I have small doubt regarding Mysql Active-Active Replication. Can it Possible to do Mysql Master-Master (Active-Active) replication in Mysql between Redhat Linux and Ubuntu? Thanks & regards, ...
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9 views

What is the preferred mode of replication for a MySQL Cluster?

Reading about MySQL Cluster, I'd like to know about what are the preferred models of replication. I understand that it supports asynchronous replication out of the box, but I'm not sure of how it ...
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1answer
20 views

Best scenario for replication type

We are using SQL Server 2012 and we have the Main office server. All modification on the product pricing table is done through the Main office. We have 10 remote sales branches. Those remotes ...
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52 views

Does PostgreSQL support multi-threaded replication?

Is PostgreSQL replication single-threaded ? Are there any tools to achieve multi-threaded replication ? I'm asking this since Mariadb support this and currently I'm learning both these dbs.
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offload DB for reporting

Need your expertise on this.. I have a requirement like this, I have an application database which currently users are running SSRS reporting against this DB. Now I want to offload the reports by ...
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1answer
63 views

Huge size on mongodb's gridfs. Should I compact ?

I'm running mongodb and grid.fs to store small files (less than 20mbs). These are part of a replica set. I currently have more than 350000 files stored. I've noticed that the chunks collection takes ...
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1answer
40 views

Replication successful but slave skips certain quries

I am testing a MySQL master-slave replication. Here is the master my.cnf: log-bin=/var/log/mysql/mysql-bin.log server-id=1 innodb_flush_log_at_trx_commit=1 sync_binlog=1 Here is slave my.cnf: ...
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48 views

I have been tasked with Mysql Master-Master replication?

I have done some study and i came to know that Mysql master-master replication violates the ACID properties and there has been problem with primary key collision.Please Let me Know,Apart from these ...
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1answer
76 views

Master-Master Replication Duplicate Key

I have set two servers master-master replication mysql , i manage to set successfully but the problem is the duplicate key i got MASTER 1 Configuration /etc/my.cnf [mysqld] server-id=1 bind-address ...
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1answer
38 views

MongoDB only three of four shards being used

Using MongoDB 2.6, I've setup four replication sets: a, b, c & d: >rs.conf() a:PRIMARY> rs.conf() { "_id" : "name_of_replset", "version" : 1, "members" : [ { ...
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34 views

Postgresql Chained Slaves and Slave Promotion

So I have a setup like Master -> Slave1 -> Slave2. Slave1 replicates from Master and Slave2 replicates from Slave1. If I promote Slave1 to master is it possible for Slave2 to continue replicating from ...
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“Replicate” Table structures with sp_addscriptexec

In our customers environment is a massive central server (running SQL Server Enterprise 2008R2) and some distributed PCs (running SQL Server Standard 2008R2). The central server has a replication for ...
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46 views

MySQL replication of single DB to same server

I have a DB Server running CentOS 6.4 and MySQL 5.5 from RPMs (not source). I have dozens of databases but one of them is being hit quite hard with large selects which locks out other updates which ...
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1answer
81 views

Best backup strategy for MySQL (MariaDB) replication set

My main concern is getting a proper backup, even more so than a temporary outage. The data is golden. I've been doing reading through the documentation and a lot of the backup strategies seem to be. ...
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7 views

MySQL replication of single DB to same server [duplicate]

I have a DB Server running CentOS 6.4 and MySQL 5.5 from RPMs (not source). I have dozens of databases but one of them is being hit quite hard with large updates which degrade the performance of ...
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143 views

Percona XtraDB Cluster/MariaDB Galera Cluster - replication suddenly stops working, cluster thinks it is in “Synced” state

We are trying to populate an empty Galera cluster using myloader. We use the latest version of myloader from repo trunk, the command is as follows: /root/mydumper/myloader -d ...
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1answer
64 views

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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1answer
55 views

temp table (#sql-7a87_230c32.ibd along with its .frm) still exists on slave

I executed some alter statements on my master server, which have been successfully executed on master (now there is no temp table on master) and all alter also have been replicated on slave server ...
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1answer
46 views

When interrupting a query on a Master, does it replicate to the Slave?

In MySQL, when does the master send a query to the slaves? Here's a specific scenario that I'm trying to understand. Admin entered an update on master that took a long time to execute. Admin hits ...
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1answer
82 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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74 views

High Availability in PostgreSQL with automated failover

I am currently working on designing an architecture for High Availability in PostgreSQL for a database of approximately 5TB in size. Also, I would like to re-direct my reads to a slave node(preferably ...
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1answer
32 views

How to make snapshot for new tables only

If there is a replication running for a large set of data, and I want to add one or more new tables, I normally add the articles to the replication and start the snapshot agent. Since there's a lot ...
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1answer
26 views

Oracle structural synchronization [duplicate]

I'm having two oracle databases. A is used for production, B is some kind of staging instance where people are preparing content that is brought to the production system over night. It is a fully ...
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1answer
53 views

SQL Server Cross Domain Transcational Replication

Has anyone got any documentation for doing/implementing Cross Domain SQL Server 2012/2008R2/2008 transactional replication document or steps (with screenshot or without screenshot) Thanks for your ...
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74 views

MySQL Database replication for high availability

configuration: 1 balancer 2 Azure machines(4 gb ram, 2 cores), with MySQL master-master replication enabled. X users connecting to the balancer to sync data. test: i've tested the MySQL ...
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123 views

trigger_file doesn't work

I set streaming replication. Replication works just fine but it doesn't care about trigger_file. I have nothing fancy there except all what many of tutorials advices: recovery.conf: standby_mode = ...
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1answer
33 views

How can I know whether postgres is currently running synchronous or asynchronous replication?

I see from ps that: postgres: wal sender process replicator X.X.X.X(38681) streaming 0/17AF5438 But is there any way for me to know whether it is synchronous or asynchronous? I made the relevant ...
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1answer
29 views

Creating Replicas Across Servers

I'm having some issues creating a replica set of my MongoDB. I have server A. Currently, it is setup as a local standalone replica. rs0:PRIMARY> rs.status() { "set" : "rs0", ...