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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730 views

Do I have to filter the percona.checksums table in replication for use with pt-table-checksum?

I've set up MySQL replication, one master and one slave. Now I just starting to check the data for integrity on both sides by using Percona's pt-table-checksum. Wonderful tool to detect any changes or ...
2
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2answers
211 views

Teaching Slony replication to select slave nodes

There is a system with up to 256 nodes in db cluster. We need to replicate some data from one of them across to all others. But for every row to replicate there is a list of nodes where it must be ...
3
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1answer
346 views

Witnessing standby failure with repmgr

We're setting up a PostgreSQL cluster, and we're looking at using repmgr to handle standby promotion and so on. Our cluster has one master and a hot standby, and uses the streaming replication ...
8
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1answer
2k views

Does SQL Server Snapshot replication completely copy the data every time or does it issue deltas?

I am looking at snapshot replication between two servers. Here is what I have: 500GB database ~500MB nightly bcp loads ~50MB daily transactions I was asking other DBAs in the company about which ...
2
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1answer
532 views

Can I replicate to a pre-existing database?

I am going to test this out, however I'd like to know what the forum would say. I have 2 SQL servers with replication setup between them. I am now adding another new SQL Server and I want this one ...
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1answer
2k views

How to script out push subscription creation at the subscriber?

I'm trying to set up a push subscription to a SQL Server publication from the subscriber. I could set up the subscription at the publisher using the Replication Wizard in Management Studio. However, ...
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2answers
5k views

Impact of changing the DB compatibility level for a Published replicated DB from 90 to 100

I have a SQL Server 2008 R2 server with a bunch of published databases that are currently operating under compatibility level 90 (2005). The subscription databases are also SQL Server 2008 R2, ...
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3answers
628 views

How can I replicate MySQL data from many servers to one?

All over the internet I can find manuals on how to replicate databases from master(s) to slaves. What I need is to continuously keep a copy of table from 5 different servers in sync. We have one ...
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1answer
1k views

Do database servers need load balancing?

I am trying to build a 1TB database on MySQL which will need strong read performance. I intend to replicate my database to prevent downtime. Do my database servers need load balancing to improve ...
2
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1answer
87 views

Replicate from master-master setup

I have MySQL Master-Master replication on 2 servers. I want to replicate to another slave server. When I configure the slave to replicate from master1, only data added on master1 is replicated. ...
2
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1answer
545 views

How to Rename Table or Field With Merge Replication

I am using merge replication with SQL 2012. I am trying to rename a published table, and rename a published field. These operations are not permitted in merge replication. However I can think of an ...
3
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1answer
672 views

Setting up MySQL circular replication in existing replication topology?

I have the following MySQL replication topology set up for fault tolerance/disaster recovery with master server A and slaves B and C: A replicates to B A replicates to C Both B and C are fully up ...
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3answers
12k views

MySQL replication - slave is continuously lagging behind master

I am using MySQL-5.1.50 with a Master-slave replication setup. Most of the time the slave is lagging behind the master. When I run show processlist;, there is no query that's taking a long time. ...
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1answer
1k views

MySQL Master-Slave Replication Cross Database

I am setting up Replication for cross Database as i have set 2 variables in Slave' s my.cnf as replicate-do-db=database_name and Replicate-wild-do-table=database_name.% ,But i am not able to get ...
2
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1answer
658 views

How to user the Tablediff Utility with Replication Filters

I am using merge replication in SQL 2012. I am trying out the TableDiff utility to show non convergence. I see a problem with this approach though. This is because I am using parameterised filters to ...
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1answer
153 views

Is MySQL replication suitable for a Write Mostly application?

I'm considering adding another server to my one-server setup application with 600GB MySQL DB. The db and the apache are both running from the same server. In order to avoid backup downtime and improve ...
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1answer
758 views

Initializing Transactional Replication From Backup

There is an option when setting up a publication for replication to Allow Initialization From Backup. We have been creating replicated databases for several years now and have always initialized from ...
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2answers
230 views

PostgreSQL replication and large import

I am tasked with making large PostgreSQL imports to master instance, and then replicate it across the nodes as read-only data. Still, the CMS system has to be able to write data and replicate across ...
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1answer
777 views

What is the difference between 'two way transactional replication' and 'peer to peer replication'?

Can someone explain in detail the exact differences between 2 way transactional replication and peer to peer replication?
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2answers
3k views

Looking for an efficient way to fix “Could not parse relay log event entry…” error

I have a corrupt relay log in MySQL 5.0 and looking for the steps to fix replication without having to reprocess all the binary logs from the master again. Here is the full error message if you are ...
5
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4answers
175 views

Replicating only changes made by a specific database user

I am performing parallel testing. We have upgraded the legacy batch jobs to a new framework which we need to test against the existing batch jobs. In the existing setup, I have web application which ...
2
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1answer
3k views

Slave I/O thread dies very often

I have MySQL Replication working between two servers in master-master mode. Replication has been working from day 1. The IO Thread and the SQL Thread has never died. However, the Slave SQL thread ...
5
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1answer
1k views

Replicating multiple databases into one database

I would like to replicate multiple databases on different servers into one master database. I have 5 different instances on separate servers all running SQL 2008 R2. The schemas and structure are all ...
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0answers
89 views

MySQL replication backup

How to take MySQL Master-Master and Master-Slave replication backup?. I have setup Master-Master replication with a separate slave for each master on Ubuntu. What happens if, I issue or schedule ...
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1answer
8k views

Some MySQL slave errors?

Master version: mysql-server-5.5.14-1.el5.remi Slave version: Percona-XtraDB-Cluster-server-5.5.24-23.6.340 Binlog format: ROW based I'm using PRM to setup HA for MySQL. Sometime, MySQL slave ...
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1answer
970 views

MySQL Replication Error, can't stop slave

When I run command SHOW SLAVE STATUS\G, I see Slave_IO_Running : 'Yes' Slave_SQL_Running : 'No' What I've usually done to fix this is to run STOP SLAVE; SET GLOBAL sql_slave_skip_counter = 1; ...
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2answers
1k views

Does pt-table-checksum point out rows that are different between Master and Slave?

Trying to verify replication integrity of my replica. And I found that pt-table-checksum is one of the best ways of doing it. I have a simple Master->Slave set up. Have created a sample table with 10 ...
3
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1answer
705 views

Safely promoting master to slave

Previously I've asked the similar question MySql Switching Masters During Failover with log-slave-updates. Let's say this is our current replication In addition, I have few application servers. ...
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3answers
687 views

SHOW SLAVE HOSTS shows incorrect output

I had used --report-host option in one of my slaves, so that I could see that under SHOW SLAVE HOSTS. Now that server is no longer in use. I have uninstalled that server as well. Unfortunately I still ...
2
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1answer
134 views

Reformatting master MySQL server and temporary solution

We have MySQL master and replication servers both running on different machines. We have noticed some system files showing integrity issues in the master machine. Temporarily we would like to make the ...
4
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1answer
303 views

Clarification about master slave configuration in mysql

We are planning to migrate an existing MySQL database to a new server using the MySQL replication master slave procedure. Unfortunately this will take a lot of time so we were thinking of doing a ...
4
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3answers
684 views

Finding differences between a master and slave when pt-table-sync fails

I have a table that's showing some differences on a master and slave according to pt-table-checksum (PTC). I've found some verifying differences beyond that. Certain tables in the mix have composite ...
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1answer
2k views

MySQL 5.5 not starting after master-master configuration

The following master-master configuration worked on MySQL Server 5.1.x(Ubuntu 10.04). Master1(192.168.2.80) ################################## #MySQL Replication ################################## ...
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1answer
453 views

Default Constraints with Merge Replication

I am using merge replication in SQL 2012. Why can't you mark default constraints as NOT FOR REPLICATION? You can disable all default constraints for a merge article, but it is all or nothing so it ...
4
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1answer
119 views

MySQL - Partially restore binary log

I have restored a dump into MySQL. I also have a binary log, which I want to partially restore, let's say from position 10 - 2500. How can I do that?
0
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1answer
781 views

mysql “Unsafe statement”

I get a lot of following messages Unsafe statement written to the binary log using statement format since BINLOG_FORMAT = STATEMENT. Statement is unsafe because it accesses a non-transactional table ...
7
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1answer
983 views

SQL Server considerations when backing up / restoring a database that uses replication

In the event that I need to restore a database involved in replication, what considerations to I need to keep in mind? Do I need to keep backups of both the publisher and the subscriber? Can I ...
6
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1answer
5k views

Best solution for cross-datacenter MySQL master-slave replication

We are working on a new system architecture for our company. We have a HPC, which runs in our own data-center and we are planning our front-end and a fallback system on Amazon Web Service. System ...
2
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1answer
185 views

How to use MySQL Server 5.6 for GeoIP replication?

I have downloaded the new MySQL Community Server 5.6 and I dont quite understand how to use it properly for GeoIP based replication across 20 nodes. I want to have one central node, then three smaller ...
3
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1answer
4k views

MySQL Exec_Master_Log_Pos value greater than Read_Master_Log_Pos

I am trying to repair one MySQL replication setup. One of the database's table at slave side is deleted and the updates from master side are received but because of missing table these updates are not ...
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1answer
609 views

PostgreSQL hot standby promotion, multiple hot standbys

I'm trying to work out failover and disaster recovery procedures for a cluster of three servers. Streaming replication is being used with a high wal_keep_segments, no log shipping is happening. I need ...
6
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1answer
2k views

Can I have an InnoDB master and MyISAM slaves with Full-Text for searching?

I'd like to use InnoDB on the master, for its transactional ability, but MyISAM on the slaves for the full-text search ability. Is this possible?
1
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1answer
302 views

Why Regenerate Snapshots For Merge Replication

I am in the process of implementing merge replication in SQL 2012 with web sync. I am wondering two things, Why is it suggested to regenerate the snapshots every 14 days by default? With web sync ...
2
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2answers
630 views

SQL Replication Commands

I'm trying to figure out how i can get the number of commands over the last day for a sql server replication. Transactional / Snapshot / Merge. I really want to be able to calculate the average ...
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0answers
563 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, ...
3
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1answer
75 views

In SQL Server Replication, at what point is it recommended that one separate the distributor?

Is there a general rule of thumb for when it becomes good practice to assign distribution responsibilities to a separate server that is not also a subscriber? e.g. "At n publishers/publications ...
7
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1answer
10k views

Deleting bin logs in replication environment

I have a question about deleting binary logs in the replication environment: We have an environment with 1 master and 2 slaves (running mysql 5.5). Sometimes, we run into a space issues during heavy ...
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1answer
857 views

Merge replication - can't create snapshot – timeout

I have a SQL Server 2008 database, and I need a merge replication because I want to sync with mobile devices afterwards. So I created a replication but when it comes to start the snapshot agent, the ...
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0answers
313 views

Msg 14027, Level 11, State 1, Procedure sp_MSrepl_addarticle [table] does not exist in the current database [closed]

Before setting up SQL Server snapshot replication, I backed up the database from ServerA and restored it to ServerB. Both servers are running SQL Server 2008 R2 SP1. In trying to setup snapshot ...
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1answer
442 views

How unsafe is it to change the data source of repl_distributor on a publisher

Here's my situation. Reporting Server (SQL 2008) is distributor/subscriber cluster for a SQL 2000 Transactional Publication Reporting Server was migrated to new SAN Reporting Server fatally crashed ...