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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9i streams capture doesn't evaluate rules

I have a streams replication set up between two oracle 9.2.0.8 instances as sources and an 11g instance as a destination, processing a small subset of data from each database (let it be one table ...
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69 views

Low performance, high availability, replicated key/value store with audit trail

I'm looking for a database system with fairly specific specs. I've looked most of the major relational databases and NoSQL products out there and did not find one that even remotely satisfied my ...
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66 views

transaction replication causing too many deadlocks after adding a indexed view - what to monitor in order to avoid this?

I have created the following indexed view and its clustered index: This view was created on a subscriber database and all the tables used in the view are constantly being written to through the ...
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2k views

SQL Server 2014 Replication - The process could not connect to Subscriber 'xxx'

I have just set up very basic transactional replication on SQL Server 2014. The Publisher and Distributor are one and the same. I have configured the Publisher to push to the Subscriber, so any and ...
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146 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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226 views

Conflict handling, SQL Server 2008 R2 Peer to Peer

I have a Peer to Peer replication topology set up between two SQL Server 2008 R2 servers. I was doing some testing on fault tolerance and conflict handling. I have conflict detection enabled, and ...
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567 views

SQL Server Replication :: Dedicated Distributor Hardware Requirements

Does anyone know any rules of thumb (or better) with regards to hardware requirements for a dedicated distributor server? i.e. Based on estimate metrics (e.g. number of subscribers, publishers, ...
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468 views

SQL Server 2008 replication scenario

First of all sorry about my english, and most importantly, my database ignorance, I'll do my best ;) Until now, the scenario that I have is as follows: In a server under our LAN, we have a database ...
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28 views

How to PUSH data between a Local DB Server to Cloud DB Server?

I have an implementation doubt regarding replicating data between SQL Server 2014 database servers (Replicating data from Local Premises SQL Server to Cloud DB Server, which are not in same domain or ...
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50 views

Why does replication with SSL fail on my MySQL database in AWS RDS?

I'm trying to replicate from AWS RDS to my own server. It works without SSL. Whenever I include the SSL property to the slave, it breaks with this error: error connecting to master ...
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59 views

Recovery from Live to a new Slave Server - PostgreSQL - ERROR

I've started a new SLAVE PostgreSQL server set up. master: 192.168.100.1 slave1: 192.168.100.2 slave2(NEW SLAVE) 192.168.100.3 * NOTE: I run the pg_basebackup from another STANDBY SERVER. Not ...
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30 views

Bandwidth-efficient, fail-safe database resync with long backlogs

I'm looking for a DB system that allows slaves to resync even if there exists a long backlog. In addition these resyncs must be as bandwidth-efficent as possible as the nodes are connected over ...
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36 views

NULL Agent Timing Out

Error: Replication-replication Distribution Subsystem: agent (null) scheduled for retry. Query timeout expired. Based on my research, this error appears when there is a lot of contention on ...
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104 views

How to set ALL the replication to DEADLOCK_PRIORITY LOW?

I have just got this email here: Then looking at the sql server log I find this deadlock was caused by one of our procedures (that was the victim) against the replication. O.K. in this case in ...
3
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50 views

PostgreSQL Streaming Replication Tools - Windows

Is there any clusterware available for PostgreSQL clusters running on Windows OS? I'm specifically interested in automatic failover and STONITH functionality. I've done a fairly extensive Google ...
3
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71 views

SQL Job Step created via wizard does not correctly set server & database_name values

I've recently been tasked with migrating a database from SQL Server 2005 to 2008R2. This has all been accomplished without any issues, but one part of the system requires a Snapshot Replication to be ...
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502 views

Postgres Streaming Replication: How to re-sync data in master (with standby) after failover

I am absolutely new to postgres 9.1 replication mechanisms. I have managed to set up streaming replication between a master and standby postgres (Both have x number of records). At one point when ...
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190 views

Recovery when failover

1/ Description: I have 2 Centos machine: master, slave (streaming replication). Both of them are built on PostgreSQL 9.3 (image below) and configured failover event (failover PG 9.3 document). Last ...
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772 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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243 views

Replicating databases for local and cloud instances

Forgive me if this is an inappropriate place for this architectural question but I'm not sure where it best fits in the StackExchange family. I have been tasked with developing an online/live auction ...
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127 views

Once in a while synchronization of the independently updated mysql databases problem

I have a production database and a test database running on MySQL with MyISAM and InnoDB tables, which are updated independently. The Production database is updated by system and sometimes by a user. ...
3
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86 views

How Much Overhead Does Web Sync Add?

I am running merge replication in SQL2012 using web sync. Has anybody done any experiments to compare the performance of web sync to connecting to replication using a straight TCP/IP connection? ...
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409 views

Upgrading Remote Distributor in SQL Server Replication

I'm upgrading my remote distributor from 2005 to 2008r2, it is performing transactional replication only. this is a prerequisite to completing an upgrade of the Publisher to 2008r2. Script ...
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56 views

Postgresql Streaming Replication Error: WAL segment removed

I want to set up PostgreSQL streaming replication, but get the following error: FATAL: could not receive data from WAL stream: ERROR: requested WAL segment 00000001000000000000006A has already ...
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17 views

Promote Postgres standby while materialized view updates in primary

I have one primary Postgres server (serverA) and one standby Postgres server (serverB), both running Postgres 9.4 with Streaming Replication enabled. Is it possible to update a materialized view on ...
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a story about a bad replication issue - insight needed MYSQL

A id val B id A_id We are not sure of what happened but it appears that when replication occurred on a series of these two table datasets, that A failed replication, but another insert got the lost ...
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33 views

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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82 views

PostgreSQL count() works extremely slow on replication slave

I'm using postgres replication. I have one master and 2 slaves. I have table first with 1 500 000 rows. If I perform select count(*) from first on master, it takes less than a second, but on both ...
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28 views

Impact of adjusting Time of Mongodb server?

Using Ubuntu 14.04 and mongodb 2.6.10 I have time difference between a replica machine and primary , my secondary isn't configured with NTP what are the implications of adjusting time on the ...
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85 views

Replication of specific tables using Postgres 9.4.4 and Amazon Web Services

I have currently setup a Postgres 9.4.4 RDS instance on Amazon Web Services. On this instance I hold 20 tables. In addition I also have Postgres 9.4.4 installed on my local server (OS: 64-bit Linux) ...
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152 views

Replication stops with GTID_NEXT error after creation/drop of memory table in mysql5.6

We have recently upgraded to mysql5.6.25 from mysql5.5.x/mysql5.1.x on our mysql-cluster. Below is a brief snapshot of our architecture. Since we have upgraded and enabled gtid-mode we have been ...
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63 views

Options for copying data out of continuously updating tables

I work with a pretty large (O(10^1) TB) DB2 (LUW, v. 9.7) database. It's got data coming in on a continuous basis via Golden Gate replication from another DB2 database. It's used for business ...
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58 views

SQL Server 2012 replication setup on routed network

I'm trying to setup replication between two SQL Server 2012 instances. I set up a publication successfully on server1, but then I had a problem when trying to access it from server2, because the only ...
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63 views

How to verify replication data integrity in SQL Server when using external replication engine

I am looking for a way to verify that data I am replicating between SQL Server databases is making it to the destination OK. Data is being replicated using an external replication engine, no built-in ...
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23 views

Transactional Replication breaks when schema is changed in Publisher

We have set up Transactional replication where in two Publishers feed into one Subscriber , now if try to change the schema of any one Publishers or both publishers, replication breaks. We have ...
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255 views

Transactional Replication in SQL server 2014

We need to set up transactional replication in SQL server 2014, Enterprise edition so that: Database to be replicated from Publisher which is approximately 2 TB in size. This would be used 24*6. Here ...
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58 views

After restarting Mysql replication, Slave commands are executed

up vote 0 down vote favorite I have a Mysql Master Slave Replication which is working fine. Unfortunately I got some serious problems on my slave and the only chance I saw was to restart the whole ...
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73 views

Why are foreign keys ignored on subscribers?

We are using merge replication on SQL Server 2008 R2. There are many tables with foreign keys providing a logical dependence on each other. For this question, let's say there are User and File tables, ...
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147 views

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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121 views

Domain name change of SQL servers involved in replication

I have a situation where client wants to change their domain name of servers hosting SQL Servers(e.g. from AB to CD). I have a transactional replication with updatable subscription configured with 1 ...
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77 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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37 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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107 views

SQL Server replication - recommendations for stability

We have two SQL Server 2008R2 Standard servers, and we've set up replication of a single database between them. The replication is about as simple as it can get - it's a transactional replication from ...
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90 views

SQL Server 2012 Replication

Please help me out with a problem I am facing. I have a table T. I altered the table to alter the column C from varchar (10) to varchar (100). Now, there is a view V that is schema bound and selects ...
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229 views

Replication slave re-reading WAL on restart

I have a standard streaming replication setup going with PostgreSQL 9.1. It works fine. However, if I stop the slave cleanly (to move it or perform other maintenance) and restart it a short time ...
2
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630 views

Transactional Replication Over Domain

I am trying to setup transactional replication in SQL Server 2008 R2 on two servers on separate domains. I am able to create the distributor, create the publication, and create the subscription, ...
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540 views

oracle streams apply: how to get a reason why LCR message was not applied

I've set up bidirectional oracle streams replication (11gR1) using identical scripts on both machines (DB1 and DB2). Although changes from DB1 are being applied to DB2, changes from DB2 to DB1 aren't. ...
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62 views

How to Remove Articles Based on User

I am using merge replication on SQL 2012. I have a very large database with a large number of tables. The subscribers are using netbooks. I have a filtering scheme that controls which tables end up ...
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376 views

What is causing all of the msrepl_tran_version columns to become out-of-sync between locations in transactional replication setup?

I have been having a recurring issue with transactional replication setups at the firm I work for. We use SQL 2008 R2. Seemingly without warning or any replication errors, all of the ...
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Syncing writes and not deletes - mongoDB

Is it possible to have a secondary instance of mongoDB which syncs all the write operations to the database and not the delete operation? I'm looking for this solution so that I have a backup even if ...