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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MySQL high availability, failover and replication with Latency

We are in the process of implementing a new CMS (Drupal 6.x) that runs on MySQL. We have two data centers -- primary and secondary -- with known latency between them. We're unsure which version of ...
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2k views

MySQL master binlog corruption

We recently made some changes to our infrastructure and now I can't keep MySQL replication running. The slave complains of a corrupt binlog and resetting it doesn't help. I keep seeing entries like ...
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Is MySQL Replication Affected by a High-Latency Interconnect?

We've got a vanilla master and slave MySQL setup that reside in different data centers, and another slave in the same datacenter as the master. The bandwidth between the datacenter is pretty high (in ...
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MySql shell command not replicated to slave

I have a shell script that looks something like that: #!/bin/bash mysql -udb_user -pdb_password -e "LOAD DATA LOCAL INFILE '/srv/some_file.csv' INTO TABLE db_name.db_table FIELDS TERMINATED BY ...
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Scaling Percona datacenters: setup and replication

Since our startup has taken off nicely we are now meeting with some of those issues that you always assumed would NEVER effect you. We have already scaled alot of our application stack: we offloaded ...
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Setting Circular Replication in mysql

I have 3 MySQL servers say A,B,C. What I want to do is that I want to make all of them master as well as slave.If there is update on any of the MySQL Servers it should be replicated to all of the ...
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1answer
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Best way to setup master to multi master replication

ORIGINAL QUESTION: I have multiple servers that all need to act as masters, as if one fails the next server kicks in and takes over. I'm just wondering what the best way to replicate is. All servers ...
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What can we do in MySQL 5.0 Replication to address bandwidth concerns?

I am developing an application to run on the client PC (Win) which is configured with a MySQL server 5.1 instance that will act as read-only slave to the remote master. The remote master has dozens of ...
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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 ...
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3answers
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How do you re-sync the Master MySQL DB with Slave DB changes if the Master goes offline?

MySQL Server 1 is running as Master. MySQL Server 2 is running as Slave. With both DBs online, they are in "perfect sync". If Slave goes offline, there's no problem if Master still online; they will ...
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779 views

will replication from 5.5.20 to 5.0.XX server work?

I gave two machines which run on two entire different versions of MySQL server. I want to do the replication from 5.5.20 to 5.0 server. Will that be possible? Because I remember when I transferred ...
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MySQL Replication : 1 Slave / Multiple Masters

I have a web app with 2 web servers and 2 database servers. The DBs are setup for multimaster replication. (this is the primary environment) I also have the exact same setup on a different location ...
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1answer
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Mysql Master-Master Replication Topologies on >2 machines

I have 3 Mysql servers that I would like to replicate: two (including the main server) are local and one is remote. Let's call my main server A, the secondary server B, and a remote, development ...
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3answers
285 views

mysql replication master 5.5 slave 5.1 error on create database

I have a replication system where my master has a mysql 5.5 version while the slave is mysql 5.1. I know that this is not supported because the slave version should be greater than the master, but we ...
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4answers
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MySQL Replication - Introduce new Slave to replication

I've recently taken on a sys admin position managing a group of 20 (or so) servers. One thing I haven't dealt with before (apart from in a test situation), is introducing a new slave to the MySQL ...
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1answer
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Fixing tables out of sync as reported by pt-table-checksum, pt-table-sync is not working

I have several tables being reported by pt-table-checksum with CRC_DIFF between my master and slave servers using the following commands: $ pt-table-checksum h=master,u=user,p=password ...
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4answers
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One slave, multiple masters MySql

Is it possible to set-up MySql Replication to have one slave listening to two different masters?
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How to setup replication(Master/slave) in MySQL 5.5.20?

I have two servers both running on MySQL 5.5.20 and I want to setup replication, so every update/insert on Master would reflect immediately on Slave machine. I tried following this tutorial (I used ...
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2answers
822 views

Mysql database replication on different vlan/subnet/another site

Saw the posts for "MySQL high availability, failover and replication with Latency" Is it possible to work it in a DR site when its not in the same vlan?
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5answers
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Is it unwise to run replication on same physical server?

I'm contemplating setting up a Master-Slave replication for my database. The slave server will be used for redundancy and possibly a reports server. However, one of the biggest issues I'm running into ...
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4answers
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Single slave - multiple master MySQL replication

I need to replicate different MySQL databases from multiple servers into a single slave server. How can this be done? is there a way to define multiple master hosts?
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2answers
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What is the Best Way to create MySQL Master-Slave Replication Setup and Troubleshoot it?

I am very new to Database Administration. I face a lot of problems while setting up mysql master-slave replication. I also face regular mysql replication troubleshooting issues. Can anybody helps ...
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1answer
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SQL Server Many-to-One replication

I have 8 individual SQL Server 2008 R2 machines, each hosting 1 database. Each database has an identical table structure and schema, and entirely unique data. I would like to establish a reporting ...
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1answer
292 views

mysql emits BINLOG rows even though binlog_­format=­STATEMENT

We have MySQL 5.5 installed, we have the binlog_format=STATEMENT (the default) According to the MySQL Documentation, the binary log should contain SQL statements only, but we still see BINLOG rows in ...
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1answer
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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?
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2answers
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Trying to understand SHOW SLAVE STATUS\G

I have slave setup and looks like it is running fine. Below is a snapshot of it. show slave STATUS\G; *************************** 1. row *************************** Slave_IO_State: ...
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2answers
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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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How to handle the My SQL DB Master to Master replication when there was a disk space outage

We had master to master replication with two node nodes A & B, both are in virtual environment. Initially there was an outage (diskspace issue) in node A and stopped replication. Application level ...
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2answers
782 views

How to resolve the master server shut down/unavailability in mysql with master - slave replication

Let us suppose that we have a master/slave setup and the application is running fine for the time being. All of a sudden the master server suddenly shuts down due to some problem. Now how can I ...
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3answers
913 views

With MySQL Replication, what level of resilience is possible?

I've found lots of good material on setting up MySQL replication, but not much on what to do in the event of failures. Understanding the degree of resilience I can achieve is fundamental to designing ...
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1answer
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MySQL Slave Relay Logging but not logging Binary Log

I have a master slave setup both mysql 5.5, the setup is fine except that the slave won't Binary log to the standard mysql-binlog only to the relay logs. I fear this may be due to my lack of ...
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1answer
539 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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1answer
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Can we capture only Slave_IO_Running in SHOW SLAVE STATUS in MySQL

I wanted to capture only status/result of Slave_IO_Running and Slave_SQL_Running column values, which I will be using to integrate into our application. Is there any way to get only the values of ...
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Loading data in mysql using LOAD DATA INFILE, replication safe?

I am trying to load data into mysql database form CSV file. I found that we could use LOAD DATA INFILE command to do it. But as per the mysql documentation it is not replication safe. (See here) Is ...
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1answer
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MySQL Replication and High Availability

I know this might not be a very good question to be asked in this site, but I really need some helps/hints to be directed to the right path. I want to have failover strategy for 2 MySQL servers which ...
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2answers
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Set up a MySQL slave using mysqldump to get the initial data

I have a master database which already has some data in it. The tables in the master database include both MyISAM and InnoDB engines. Now I want use mysqldump to dump the initial data of my slave ...
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PostgreSQL Failover - What tools should I use?

Here is the scenario: There are two machines running CentOS 6.2 - machine0 and machine1 Both have PostgreSQL 9.1 installed. One of them should be active, as a master system and through asynchronous ...
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Replicating a remote MySQL database to MS SQL Server 2008

I want to replicate the contents of a MySQL database to a MS SQL Server 2008 database. Is this possible? Can anyone outline the steps required in order to achieve this? Thanks.
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What max_allowed_packet is big enough, and why do I need to change it?

I have MySQL (5.5) in master-slave setup and created another slave server. I stopped the original slave, dumped the data, copied and reimported and it worked fine. I noted the master_log pos of the ...
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1answer
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Configured MySQL replication but its not working

I have configured MySQL master and slave replication setup on 5.5.x. But for some reason data is not getting replicated properly. What might be the reason? At Master: /etc/my.cnf [mysqld] ...
3
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1answer
114 views

Screwed up replication by sharing server ids

So I had my screwup for the week today. I was adding another pair of slaves and set the same server ID on the new slave as an old slave. The layout kind of looks like Master | | \/ | oldS | ...
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1answer
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Mysql master-master replication auto flush old logs

I have mysql-5.1.41 master-master setup running on ubuntu machines and below is the configuration of a master: skip-host-cache skip-name-resolve event_scheduler = ON max_connections = 500 ...
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2answers
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MySQL Replication Lag Behaving Erraticly

I've got a vanilla MySQL replication, using "MIXED" mode. The mysql slave lag calculation behaves very strangely - one moment it is 0 and the one after it it's 3630 seconds (or a similar number), ...
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1answer
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Replicate MySQL 5.0 Master to 5.5 Slave?

We're planning out a series of server/software upgrades and were curious. We have a RHEL5 install running MySQL 5.0 that we'd like to replicate to a new (virtualized) server running CentOS 6 and ...
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3answers
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What are the limits on the amount of slaves per master?

I currently have a Master with 2 slaves, all running MySql 5.5. What are the limitations on the amount of slaves I can connect to a single master? what parameters should be taken into affect?
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Does `Seconds_Behind_Master` show exact Slave Lag from Master?

Does Seconds_Behind_Master always show the correct number of seconds the slave is behind the master? I have also Implemented the mk-heartbeat replication monitoring. It was showing the other result ...
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1answer
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Maatkit shows the MySQL replication error in one table, but won't fix it

We use MySQL 5.1 with a primary/secondary replication setup. I use mk-table-checksum from Maatkit to generate checksums on the master and perform consistency checks on the replica. mk-table-checksum ...
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1answer
167 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 ...
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1answer
606 views

3 Databases, Best Replication Setup?

We have 3 DB servers, two of them i.e. db1, db2, are located in the same data center. The other one i.e. drdb, is located in a different site. Currently, the replication setup for these servers is of ...
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1answer
466 views

temp table (#sql-7a87_230c32.ibd along with its .frm) still exists on slave

I executed some alter statements on my master server, which have been successfully executed on master (now there is no temp table on master) and all alter also have been replicated on slave server ...