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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Bandwidth comparison between log shipping and transactional replication

Which technique uses more network bandwidth: Log shipping Transactional Replication Can some one share any benchmarks for the same ? What would be the Memory and I/O impact on the Primary server ...
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How to reinsert corrected rows from the conflict table?

I have a bidirectional merge replication. I had failure constraints because the primary key was just integer. I change the primary key to the old primary key + a location identifier.The problem is how ...
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546 views

Will deleting data in master automatically delete data in slave?

I have data replication setup on MySQL. If I delete data on the master, will replication know data was deleted and automatically delete the same data on slave?
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Can I use replication/mirroring to have a “Current” database and a “Full History” copy?

I have a database that is used for current operations. The amount of data is starting to get a bit to much for the applications using it. Most of the data is older and is very rarely needed. I am ...
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1answer
7k views

MySQL slave stuck in “Reading event from the relay log”?

5.5.28-log MySQL Community Server (GPL) by Remi binlog-format=MIXED My problem is similar to this question. *************************** 2. row *************************** Id: 973415 User: ...
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1answer
370 views

Bi-directional replication for the same MySQL table

AppA stores/retrieves data from dbA.tableA AppB stores/retrieves data from dbB.tableA tableA definition is the same across these databases. To start with dbB.tableA was copied from dbA.tableA ...
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mysql second slave not syncing while first slave works fine

I have a master (m) - slave (s1) setup using mysql 5.1.45 When I try to add a second slave (s2) the slave lags behind and never catches up on the sync. Even after having synced the s2 with the whole ...
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141 views

Advise On SQL Server Data Replication

We have a huge enterprise system, with geographically seperated SQL servers. We have some requirements related with data replication between these servers. We have considered the Sync Framework ...
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936 views

Do I need client certs for mysql ssl replication?

I'm setting up mysql replication using SSL, and have found two different guides. The first one creates both client and server certs, while the second one only creates server certs. I don't know ...
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118 views

Is it possible to have extra tables in a Slave with MySQL Replication

As my title mention I have a Master and a Slave database. Master if for operations data and my slave mainly for reporting stuff. The issue is that I need to create extra tables on reporting that ...
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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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MySQL 5.1.67 - Replication failure Mysql, Master Log Truncated or corrupted

I have run into some issues with replication After an in-place upgrade of mySQL from 5.0.77 -> 5.1.67 rel 14.4 Percona replication between a master and multiple slaves is causing issues. slaves are ...
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MySQL Slave Lagging Almost Daily -Ver 5.5.17 ( Master & Slave )

I am observing this lag in a continuous manner. Investigating in the bin log events, i found the following information. Slave executing the relay Logs slowly. 1. Changing the Innodb File Format ...
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Does MySQL Replication hamper the performance of my DB?

I am not exactly a 'Qualified' DBA, but yes i am in charge of my own DB which we use in our social app. I have recently implemented Master/Slave Replication on my Database for obvious reasons. What ...
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Replication on MySQL server

I had to stop the slave server to test something. After I started the server again there is a problem with replication on MySQL server On the problematic server mysql> SHOW SLAVE STATUS\G ...
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1answer
659 views

MySQL monitor prompt does not return for slave

I'm trying to fix a replication error (or an ongoing failure to replicate) between our master and slave MySQL databases. The procedure I have asks me to use MySQL Monitor to stop the slave. stop ...
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4answers
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How can I replicate some tables without transferring the entire log?

I have a mysql database that contains some tables with private information, and some tables with public information. I would like to replicate only the tables containing public information from one ...
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What type of SQL Server Replication fits our scenario? Merge or Transactional?

Background In our current setup, we have a single SQL Server 2005 instance on our remotely hosted web server. We additionally have another (non-MSSQL) database which we use for our POS system, which ...
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MySQL Slaves lag behind master

I have one master and four slaves. Sometimes all my slaves lag behind the master. I have implemented the heartbeat for monitoring replication lag. Now I am trying to find why the slaves are lagging ...
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945 views

MySQL replication between VPS and shared host

I have a VPS where I have ssh access and shared host with CPanel. Both have MySQL. I need to create a master/slave setup among the two server. As per this tutorial: How To Set Up Database Replication ...
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Slave SQL thread got hanged

We have a master - slave setup with ROW based replication. We are seeing huge delay's on the salve even though there is no activity running wither on master or slave. When we looked in, we observed ...
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1answer
5k views

Best way to perform SQL Server replication over multiple servers?

My current setup requires me to use three separate SQL Server 2012 instances (installed on 3 separate machines, separated geographically) and have the data be replicated across all 3. Any changes made ...
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224 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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2answers
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Breaking Semisynchronous Replication in MySQL 5.5

I've set up Semisynchronous Replication between two MySQL 5.5 servers running on Windows 7. My application is running and updating the database of the master server and same is being updated in the ...
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1answer
116 views

How can we achive the replica of databases for SQL Server?

I have been working in VB6 to VB.NET migration project.In VB6 project they have individual databases (access db .mdb) for every user now we made that to centralized database using SQL Server. In the ...
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1answer
678 views

SQL Merge Replication: Cannot resolve conflict

I have a SQL Merge Replication over HTTP (Replisapi.dll). I'm not very familiar with the internas of the replication conflict solving because it was always working so far. Now I have two conflicts in ...
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How to sync MySQL database between two servers

I need to sync a MySQL database between two servers. If a new record will be added in server A, then server B fetch new record. If a new record will be added in server B, then server A fetch new ...
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3k views

Permissions for a MySQL user which will monitor replication status?

I'd like to use a script to monitor the replication status of a MySQL database like in this bash script: https://gist.github.com/wesdeboer/1791632 I'd like to create a user which will only be used to ...
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Why do I get “The initial snapshot for publication is not yet available.”?

We are using Transactional Replications with updatable subscriptions. 1 publisher, 1 subscriber. SQL Replication started encountering a constraint error on 3/6 at 10AM because people at two different ...
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1answer
265 views

Minimising downtime implementing merge replication on live system

Background We have three Servers running SQL Server 2008 which all contain a Product database. These are currently kept in sync once per day by sending a copy of the MDF to the two Subscribing ...
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MySQL Replication without stopping master

I am currently setting up a replication for my database one of the ways i am thinking of synchronizing the master and slave without write locking the master, is by first taking a log position then ...
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1answer
802 views

PostgreSQL 9.1 streaming replication problem: replica fails to use an index properly

We use PostgreSQL 9.1.7 on Ubuntu Linux 12.04 on a master server and PostgreSQL 9.1.7 on FreeBSD 9.0-RELEASE on a replica server. The replica and master servers return different results on the same ...
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Replication issue - CREATE SELECT alternative?

I've an MySQL 5.1 slave for our BI team. They need to make some CREATE SELECT with big select queries (several million lines). As CREATE SELECT is a DDL, if the replication attempts to update some ...
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313 views

INSTALL PLUGIN 'rpl_semi_sync_master' SONAME 'semisync_master.so' not working

I'm trying to install semi synchronous replication in my mysql 5.5 and trying to execute the below command: INSTALL PLUGIN 'rpl_semi_sync_master' SONAME 'semisync_master.so' but this command is ...
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1answer
90 views

MySQL Replication using SSL

I am in the process of replicating my database so i can have a master slave configuration, one of the issues i have is with security i am basically generating my server/client keys and certificates ...
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1answer
515 views

SQL Server 2005 Replication

I am in the process of creating Replication between 2 Remote Servers, server 1 is the Distributor and Publisher and server 2 is the Subscription. server 1 windows 2003 server 192.168.10.1 connected ...
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1answer
424 views

Create a mysql slave database from master database

I have a mysql master database running. I want to have a slave database. So, I stopped the master mysql database and copied it to the slave machine. I had bin log enabled on master so even those files ...
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1answer
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Global locking for multi-master Oracle GoldenGate replication

This is a very complex scenario, but I figured a state-of-the-art challenge might interest some of the many high-end users of dba.se. Problem I'm working on an intercontinental data replication ...
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1answer
196 views

PostgreSQL Hot Standby

I have two PostgreSQL servers running on my local Ubuntu machine (port 5437 is master, port 5438 is standby). While following the tutorial on http://wiki.postgresql.org/wiki/Hot_Standby I get this ...
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How to choose a good value for MySQL relay-log-space-limit?

I just read this blog post about relay-log-space-limit on MySQL. I am convinced that the 'unlimited' default is indeed not very good. But how do I choose a good value for it? We are using ...
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SQL Server replication for off site copy

We have our Primary SQL Servers in-house (15 primary servers at the moment (500 databases approx overall), most of the servers have hex core processors). These are mirrored to other backup servers in ...
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MySQL: Adding Routines to a Slave

While setting up the MySQL replication, I took the mysqldump (without--opt --routinesoptions) unaware of the fact that in mysqldump, --routines it is NOT enabled by default. Questions Is there any ...
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Replication between SQL Server 2005 and Azure database

Is it possible to set up transitional replication between a SQL Server 2005 and a SQL Azure database? My server is nearing end of life and I would rather migrate to a cloud infrastructure instead of ...
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1answer
482 views

How can I disable utf8mb4 entirely on MySQL 5.5?

I know you're not supposed to do this, but I have a MySQL 5.5 master and a MySQL 5.1 replication slave. That's supposed to be okay, unless I do something stupid like use utf8mb4 that isn't supported ...
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281 views

Anyone want to try a script bash or python?

I need to automate master binary log purging to occur so that purging never goes back further than the last slave has the updated info for. These slaves are mobile and there are 3 of them, and sync ...
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1answer
783 views

How to troubleshoot SQL Server Merge Replication Conflict?

I have SQL Server 2008 R2 Merge Replication setup. I have 2 publications for the same database with 20+ subscribers. The logic of our application prevents changing the same data from 2 subscribers ...
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1answer
3k views

Is PostgreSQL replication production ready?

How does PostgreSQL native replication compare to MySQL? I know asynchronous replication has been supported for longer than sync, which is recent. Is synchronous reliable to be used in real projects? ...
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551 views

How to replicate from SQL Server 2000 to SQL Server 2008 R2?

I have SQL Server 2000 as publisher and SQL Server 20008 R2 as subscriber. I want to replicate data from SQL Server 2000 to SQL Server 2008 R2 on a different machine. Primary key fields are not ...
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1answer
604 views

Automatic MySQL Sync from master, where Slave was offline for long period of time

Does anyone here know if there are any tools, not using mysql's built in replication that will sync up two databases when the slave has been inaccessible from the internet for extended periods of ...
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169 views

Master Slave Replication in Mysql

I have generated a dump from Master and I have to construct slave and give privileges and binary log position and file name of master for it to obsorb from master. Master is a high transaction OLTP ...