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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SQL Server replication service in Amazon RDS

I have a local infrastructure with multiple SQL Servers. Some of the servers have replications services to copy some data to a master database. Is it possible to have the replication services to work ...
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95 views

SSIS v/s Replication v/s logshipping

I have 2 SQL server instances, on different servers. One is Production instance and gets lots of reads and writes daily. Another one is for external applications to use a copy of few of the tables ...
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44 views

Automatic Failover without data replication

I have a need to be able to automatically failover my databases and most need data replication. However, one database does not need data replication and so, for performance reasons, we do not include ...
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40 views

mysql replication

I have a master mysql server (M1) with two replicating slaves behind it. I also have another master mysql server (M2) with it's two slave servers. The slave servers currently replicate everything from ...
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mysql safe mode running caused replication failure

I have been using database replication (Master-Master) in two of my server's running Mysql over Ubuntu 12.04 LTS server edition. I had to reset the database root user password of one of the server ...
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167 views

How much RAM should you allocate a MySQL replication slave?

Our MySQL master is allocated 24GB of RAM (innodb_buffer_pool_size = 24GB), but was curious if there was some standard amount to allocate to a replication slave? Right now the slave is just used to ...
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54 views

SQL Server replicated databases swap

I have a SQL Server 2012 database. I would like to be able to make changes to this database or to it's replication, then make the replica, the real one. The point here is to have 0 downtime on ...
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1answer
48 views

Making data from one schema available to another schema

I need to make data that is currently in one schema available to a different user in the same Oracle database. Does this require that we replicate data from one schema to another? Or is there a ...
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1answer
47 views

How can I find out if any cluster member is offline in mongodb cluster?

I have a mongodb cluster with 1 master machine(running mongos and config service) and 3 slave machines(used as data store).But now,I find that one of 3 machines (192.168.10.11) is down because I can ...
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SQL Replication - Data not showing

Good Morning, I have recently setup SQL replication and changed some data in one of the tables on the primary table. This data however has not been replicated to the subscription server. On the ...
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1k views

MySQL:How to correct a corrupted MySQL binary log on Master server?

We are using MySQL DB with one master and one slave. We are using this setup for months now. The slave sync stopped today and the error we got was: Last_IO_Errno: 1236 Last_IO_Error: Got ...
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1answer
71 views

Log Shipping in lieu of replication

I have two SQL Server 2008 R2 systems that, due to network restrictions, cannot use SQL Server replication. However, data needs to be shared between these systems. It may be possible to send a file ...
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58 views

MySQL SSL Master-Slave replication not syncing

I have originally posted this thread on stackoverflow and after a comment I moved it here. The original post can be found here. I have setup a typical Master-Slave replication scheme for my MySQL ...
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90 views

Replication Monitor Missing Subscriptions in Watch List

In Replication Monitor, for one of our publications (transactional replication), none of the subscriptions are showing up in the Subscription Watch List. This is new behavior that just started ...
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1answer
640 views

Master - Master replication Duplicate entry

I've got a Master - Master replication setup and it worked fine for a couple of days but I keep getting: Duplicate entry errors after a few days... My setup is as follow: One server in The ...
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1answer
76 views

How to know if logreader agent already exists?

I'm creating a script to recreate a database for test purposes, and the database has some publications. In order to create or not the logreader agent I need to know if the current database already ...
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1answer
25 views

Permission error replica set

I'm having some trouble with intentionally removing a secondary from a replica set. I'm trying to simulate unexpected shutdown. My replica set consists of one primary and 2 secondaries. When I shut ...
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3answers
2k views

Snapshot Replication Retention

I've got Snapshot replication set up on my SQL Server 2008 production server, and I just noticed that there are snapshots ranging back to a year ago in the snapshot folder. How can I change the ...
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1answer
144 views

Can we use old primary to sync with standby after failover in PostgreSQL?

If my standby (postgres) is behind by few seconds before failover. What is the easiest way to sync back my old primary after failover in PostgreSQL. In Oracle we have the option of Reinstating a ...
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1answer
86 views

Mysql replication dump without down time? empty sql file

I try to create dump as replication master data and use followed command to create dump, but sql file only contains paramters and there is no data and structure. The command is : mysqldump ...
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2k views

PostgreSQL streaming replication broken: invalid magic number, out-of-sequence timeline ID

For some reason, my PostgreSQL slave no longer streaming-replicates changes on the master. It was working before, for a while, but I recently noticed that the slave's database contents is old, and ...
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280 views

MySQl master - master replication not working [closed]

I'm trying to setup a master - master setup and I see both masters connect to each other in workbench: server 1: -- Thread Id: 112 -- User: slave -- Host: 207.244.73.38:55164 -- DB: None -- ...
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61 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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2answers
481 views

Replication fails because of a non-existent foreign key

I have been trying to get a previously working replication to start working. I have tried many settings, but I can't seem to make it work. Here is the scenario. I dropped all the FK constraints ...
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1answer
38 views

Moving large database to another drive, how to measure performance before, and setup some type of replication for fast fail back?

Sorry if this is kind of more than question at a time, but here goes. Running SQL Server 2008 on windows server 2008 as well. We have a large database just over 200gb right now (it holds images of ...
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179 views

Alternative of replication in internet disconnection period of time [closed]

I'm looking for an alternative of merge replication that work without internet connection, something like red gate sql data compare but not in uniq direction.
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1answer
43 views

Changes to main Database during Transactional Replication

Can you please advise how can I keep slave database up to date while it's in transactional replication with master. I mean what If I change indexes, columns, tables or sthm else in master dabase? ...
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73 views

How do Identity Columns get Replicated?

During Transactional Replication, we have data going from Server A to Server B. Say we were to reseed an Identity Column on a Table on Server A (for whatever reason), how would this affect the data ...
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181 views

What locking can I expect with DBCC CHECKIDENT(RESEED)

I'm working on a project that has hit a bit of a snag: I'm replacing some replication with a home built system so that if replication goes down we don't blow our SLAs with our customers and shell out ...
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122 views

Looking for suggestions to Migrate Amazon RDS Large Instance to non-amazon host - Live

We have an Amazon RDS Large instance with a database of about 20GB that needs to be migrated without having to take our website down or minimize downtime to less than a couple of hours. And I am ...
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78 views

Postgres: What happens if your slave DB went down temporarily?

I have a master DB that is replicated to a slave DB through binary replication. What happens if this slave DB were to go offline for a period of time? Would it eventually catch up with the master as ...
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1answer
460 views

What are the drawbacks of using Galera Cluster instead of Master/Slave Replication?

What are the drawbacks of using Galera Cluster instead of regular Master/Slave Replication? Galera's 0 slave lag time, Synchronous replication and no Single point of failure seem very appealing then ...
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1answer
81 views

Max allowed packet changed still replication not starting

Suddenly I notice my replication stopped and first I got some primary key duplication error when I checked using the show slave status\G. Then I remove those lines and restarted and ending up now with ...
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1answer
123 views

Copy few rows from one database to another

I have two PostgreSQL databases on two different machines and the network connection is slow. I would like to copy few selected rows from the first instance to the second. Unfortunately, the full dump ...
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518 views

Using SQL Snapshot Replication to refresh TEST databases from PRODUCTION. Why not?

What are the drawbacks and downsides? We want to schedule automatic nightly refreshes of 20 databases, approximately 1GB each, from the PRODUCTION server to the TEST server. We're setting up SQL ...
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63 views

SQL Server 2000 Replication, Performance, and Query Priorities

I'm a developer and wanting to confirm the following: Does anyone here have experience with SQL Server Replication (transactional) on 2000? We are trying to convince the DBAs to allow this in a ...
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101 views

Slave fail first due to duplicate primary key then corruption error

I have a mysql db running the slave very well for few months. Suddenly today I notice it stopped since 18Nov. I check the status it was showing me the primary key duplication error. SO i stop slave ...
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1answer
291 views

When using a master plus multiple slaves, how do I change over from one server to a brand new one with minimal downtime?

In my particular case, I'm using Heroku Postgres (repackaged Amazon EC2 instances running PostgreSQL), but platform-agnostic answers are also good! Heroku's instructions describe the process for ...
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1answer
191 views

Double queue reader or is it still busy?

I came across this line in the verbose log on replication QueueReader Agent job startup. The Queue Reader Agent has encountered the error 'Another queuereader agent for the subscription or ...
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1answer
64 views

Is it any good for performance to have master and slave on the same server

There are similar questions on this site, but they mostly cover server failure and data backup aspects. I'm concerned only as far as query performance. If master and slave share the same resources, ...
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MySQL relay log corrupted, how do I fix it? Tried but failed

A MySQL v5.1.61 relay got corrupted when the machine suddenly shut down. I tried to fix it but it didn't work. — How do I fix it? Did I do something wrong? As far as I've read, corrupted MySQL relay ...
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2answers
477 views

Can Availability Groups replace transactional replication?

I've been looking at the new features of SQL Server 2012, and how it can help my current situation. Currently we're on SQL Server 2008 R2, and replicate two OLTP servers' databases to a single ...
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1answer
1k views

Duplicate entry in mysql slave

I have a mysql master-slave replication setup. when I checked "show slave status", I got the result as "Slave_Sql_running:No" and Last error as "Duplicate entry 'x' on query." But when I tried to ...
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1answer
206 views

Approaches for Real time copy of database on same SQL Server instance

I have a draft of requirements that look like this: Production database should be copied in real-time to "Pre-prod" database The Pre-prod database should be available to read and update It should be ...
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1answer
126 views

Backing up MySQL w/MyISAM on Amazon RDS

So, for various good reasons, we're maintaining a mySQL database using a MyISAM engine on Amazon RDS. I've just taken over this application, and I'm concerned we're not getting good backups, since ...
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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 ...
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129 views

Log file growth due to replication issue

I have one primary database and it's getting replicated to another server. Both servers are SQL Server 2008 R2 with SP1. Replication was running fine till last week. We have transaction log backup ...
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1answer
171 views

MySQL Master Slave Replication and backup

I would like to implement the following backup solution as highlgihted on the mysql site: To use replication as a backup solution, replicate data from the master to a slave, and then back up the ...
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1answer
264 views

Improve performance of transactional replication

I 'm testing implementing transactional replication . The replication works fine if I insert/update handful of rows. The problem occurs when I have a sql job running which deletes/updates & ...
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mysql replication successful but slave not replicating

I have created a mysql master-slave configuration and things look fine . the " show master status;" on slave doesnt show any error . this is the output Slave_IO_State: Waiting for master to send ...