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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PostgreSQL 9.3 slaves don't recognize hstore as a type

I am using the postgres built in replication with two slave nodes and a single master. On the master node (as well as the slaves) the hstore extension is installed. But whenever a query using hstore ...
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3answers
771 views

postgreSQL 9.3 streaming replication delay

I'm running a fairly simple WAL streaming replication setup between two postgreSQL 9.3 servers that are on a private 1Gb LAN, but recently I've noticed that there is an increasing amount of ...
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1answer
260 views

MySQL Seconds behind Master fluctuation

I have two servers set up in Master-Master with one additional Slave connected to the first master. Lately I've started getting alerts from monyog that Master 1 has a seconds_behind_master value of ...
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1answer
213 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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1answer
291 views

Sync postgreSQL with SQL Server database- on data change event

I have one PostgreSQL database and its data are being changed regularly. I want to sync all its data with my SQL Server database. One thing I can do is use query to check all required tables and ...
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1answer
243 views

MySQL Replication : Duplicate entries - SQL_SLAVE_SKIP_COUNTER or delete row?

I have a system which replicates one database to four slave servers. Every now and then, when traffic is high, one or more of the slave servers hits a duplicate insert error and the slave stops ...
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2answers
173 views

MySQL 5.6 showing wrong “second_behind_master”

mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 10.10.7.98 ...
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1answer
495 views

Design for active/passive Master-Master mysql Setup

I have a dozen virtual machines running application + mysql instances (version 5.1 up to 5.5). Due to the bad I/O of the virtualization I want to buy a physical server for mysql and move all mysqldata ...
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1answer
39 views

Consistent backup of large DB --single-transaction

I need to mysqldump a large DB (330 GB) in order to set up a slave for replication. Does --single-transaction allow me to dump the entire DB without shutting mysql down and keeping it down for the ...
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1answer
54 views

SQL server replication - Does not ask for the snapshot folder

SQL SERVER 2008 When I created a publisher for the first time, it asked for the snapshot folder path. I deleted that replication and tried to recreate the publisher. This time it doesn't even ask for ...
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53 views

Postgres Replication From Different Masters?

I'm getting a Postgres 9.3.3 install sorted out. My application is Drupal (so read/write), but low-traffic, so all application traffic is sent to the primary master. I have two sites (main and ...
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1answer
172 views

Change posgresql 9.3 slave roll password

I need to change the password on my slave posgresql server, because the person who set it up left the password the same as the password for the super user account on our other server. When I run ...
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1answer
99 views

Mongodb replica sets: why does my master server occupy more disk space than my slave?

I have two servers on my replica set. Let's call it the master and the slave, for the purpose of this discussion. The master was the original one, and the slave was replicated from that master. At ...
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3answers
80 views

Snapshot replication - How to detect when a snapshot has arrived on the Subscriber from the Subscriber DB

I have snapshot replication set up to on a server which publishes to a second server as part of a scheduled SQL Server Agent job. When the snapshot finishes, I would like to detect when each table has ...
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1answer
96 views

Fan-In replication 4 Master -> 1 slave

I am trying to merge 4 source db's (one for each region) into a global db. We use ID ranges as primary key on the tables in each region and so the merge should happen nicely. I have a fairly high ...
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2answers
52 views

Mysql Master Offline

In a unidirectional Master-Slave setup, should the slave be manually stopped in cases where the Master is offline due to Maintenance, Crash etc. ? Or should one just leave it so that it keeps trying ...
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130 views

How to use Select query just right after Insert on master in a query.?

I have a question on mysql replication. As usual, I deployed my db structure like the Update on master db, the select on slave. My questions. If I use SELECT query just right after INSERT in a query, ...
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2answers
144 views

MySQL Slave not updated

This might be a duplicate of questions on the same problem asked before. But all the suggestions to the previous questions do not seem to work in my case. I have set up Replication using SSH Tunnel. ...
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1answer
160 views

distrb.exe & Logread.exe using huge SQL.txt file in C:\Users\sqlsrvacct\AppData\Local\Temp folder

I have the following situation: SQL server 2008 R2 SP2 I have both the Distribution and Subscription database in this server. LogReader agent and Distribution agent are running in continuous mode the ...
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1answer
97 views

Impact of replication compression & encryption on performance, traffic?

What is the impact of MySQL compressed-slave-protocol on replication traffic? According to High performance MySQL it can lower the traffic to a third of the same replication without the compression. ...
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1answer
76 views

Determining replication traffic

is there any way to determine from server statistics* running MySQL, how much traffic(bits per second) WOULD replication consume between 2 servers, without setting-up the actual replication between ...
2
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1answer
652 views

Replication from EC2 Master to RDS Slave - Connecting to master

I am migrating my company's database from an EC2 instance to an RDS instance. I have already migrated a snapshot of data and am now trying to set up replication to get the data that has been added ...
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41 views

SQL Server DTC: is it possible to automatically replicate data that is created on Oracle DB?

I have a SQL server with a table that is spec'd exactly like a table in an Oracle database. What I would like to do is automatically copy the data from the Oracle table to the SQL server table... Is ...
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1answer
640 views

MySQL master master replication, safe to delete rows on both masters?

We have a MySQL (v5.1.61) cluster with two masters (and two slaves). We have a table logs with a primary key column logID. This log table grows rather huge, and we'd like to delete data from it. So ...
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0answers
131 views

Data Corruption on base backups created with wal-e?

I have streaming replication setup on Postgresql 9.1 with two machines on AWS EC2. The master has a cron job that does a daily base backup using the wal-e tool and uploading it to Amazon's S3 storage. ...
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41 views

Performance : MySQL replication or only one big server?

I'm searching about the best choice. We have to host a website with 10.000 - 20.000 visitors per day actually, growing. At the beginning, which would be the best : Having 2 MySQL servers (12 GB ...
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2answers
678 views

Postgres Streaming Replication lagging, using lots of CPU and little I/O

We have 2 dedicated DB Servers. One is master and other is its streaming slave. Postgres version 9.0.17. We have similar hardware on both servers and using 15krpm SAS drive in Raid 10 for Database ...
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1answer
199 views

MySQL - Best long read query solution within a replication based system

I'm working on a project where work in a queue requires a database read against heterogeneous table schemas (InnoDB/MyISAM). The queries constructed during the "read" process can result in 10-15 ...
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319 views

SQL Server Replication Monitor Throwing “Specified cast is not valid. (ReplicationMonitor)” Error

The publisher is running SQL Server 2008 R2 on a Server 2008 R2 box. The subscriber is running SQL Server 2012 on a Server 2012 box. I have tried launching the replication monitor from both servers ...
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1k views

Query to check if all replication articles are created at Subscriber SQL Server 2012

I am creating an automated build and test tool for our databases. In general there are two stages: - install databases in version A, install transactional replication - drop replication, update ...
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19 views

Is it possible for unique key to break master-master replication in mysql?

I have a master-master mysql setup with 2 servers running the exact same application making writes to such a table: CREATE TABLE `metric` ( `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT, ...
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51 views

Replication failure after old domain controller shut down

We changed domains on our SQL Server 2008 R2 about 6 months ago with no issues while the old domain controller was still up. The old controller was taken down today and our replications started ...
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3answers
161 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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60 views

Create replication sql server for DWH [closed]

I have a DWH and I need to make an update once a day from STG Database to DWH I need use replication in SQL SERVER, How I do this?
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192 views

MongoDB Sharding and Replica Set Allocation

I am going to setup MongoDB cluster: 3 config servers, 3 routing servers, 2 shards (replica set per shard). A replica set is just simply 1 primary, 1 secondary and 1 arbiter. Therefore, in my ...
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58 views

Is there a way to synchronise 2 postgresql server that may be deconnected and modified?

I would like to know if there is a way to use a cluster / replication mecanism that can manager deconnection and modification while deconnected. Say I have server A and B, they see each over, cluster ...
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1answer
233 views

Is it possible to recover from a LOST_EVENTS incident from an RDS read replica?

I was setting up a read replica of an RDS database for a reporting project, and issued an incorrect GRANT statement when configuring a user. My RDS read replica stopped, with an error message on the ...
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1answer
577 views

How do I fix Replication event checksum verification failed while reading from network. Error_code: 1743

Our server had disk space problems. As a result, replication's IO Threads fails to start. Here are the errors in mysql error log: [Note] Slave I/O thread: connected to master ...
3
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1answer
299 views

MySQL multi-source replication with identical DB names

How can I set up a multi-source master/slave relation with masters having the same database names? I am using the MySQL labs 5.7.2 release with multi-source replication. One of the use cases for ...
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1answer
459 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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1answer
40 views

Preparing a former master to run as slave again

I have a streaming replication setup using postgresql 9.3. I have two servers, the master (server_1) and the slave (server_2). The other day I did a failover to my slave (server_2). Now server_2 has ...
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1answer
99 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
122 views

Using non-replicated read/write databases on a MySQL slave server

I have a MySQL slave server that has two databases being replicated from a master. What I'd like to do is add a third database that I will exclude from replication and use as a read/write database. ...
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2answers
140 views

MySQL Master <=(Slave,Master)=> Slave configuration

Sorry for the wonky title if it got you confused. I want to know if a server can be a slave and master at the same time. Our problem is that we have lots of mobile units that need to be synced to the ...
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1answer
78 views

What synchronizes two delayed replicas, which is part of the replica set, included in sharded cluster?

Please take a look at my mongodb map at http://postimg.org/image/krzvmep4d/ What synchronizes two delayed replicas, which is part of the replica set, included in sharded cluster? How can I use my ...
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203 views

MySQL 5.1 replication broken after crash, duplicate key error, why? No redo log corruption

What do you think is the reason for the duplicated key errors in our MySQL 5.1.61 replication slave, after the slave machine crashed? It's not corrupted redo logs. Details follows: We have ...
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25 views

How to Replicate data from read only sql database to Active one

We are applying logs in every 30 min to one SQL db which has to be in Restoration Mode/Read only mode as we are applying logs continuously. Now we have to Set up Replicaion of this Read only Db to ...
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1answer
30 views

Suggested ways to route traffic between master / slave

I have multiple Postgres servers up, running in master / slave streaming replication mode. I was wondering what the suggested methods of routing write traffic to the master, and the read traffic to ...
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1answer
46 views

How to resynchronize replication for a single database

I have two MySQL 5.5 servers in a master/slave replication setup. The server hosts about 10,000 databases, but the replication is messed up for only a couple of databases. To fix the replication I ...
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3answers
310 views

Changing MySQL auto_increment_offset

Sorry for the wall of text, but I don't know what's relevant and what's not. I have MySQL a MySQL database that it is being replicated from our production environment to our development/test ...