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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What is the Best Way to detect if server is a Master inside a Stored Procedure?

I'm want to create a stored procedure/event to do some maintenance tasks. My setups are master/slave configured for failover scenarios (meaning the slave is not used for reporting, just might be ...
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First time running a replication on SQL Server 2008. “The process could not connect to subscriber 'SERVER2'” [duplicate]

I've set up Replication between two remote servers, Using Peer to Peer & Transactional updates. The subscription is all set, but the actual replication doesn't take place. When viewing the ...
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679 views

MySQL Replication: Slave with Different Column From Master

I have a Master/Slave replication. I had to change the name of one of my columns in one of my tables from temp_col to sent_at, this column is not being used yet. I've issued an alter table on an ...
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Mysql thinks Master & Slave have the same server-id

I've been setting up a master->slave_a->slave_b relationship and having a little trouble. I currently have the master->slave_a replication working fine. Each of the two slaves have exactly ...
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987 views

How to eradicate Mysql Slave Replication delays when huge updates from master

At my environment we had slave replication with mysql server version 5.1.47 enterprise version.When ever there is huge updates from master, slave is lagging behind the master. What is the best ...
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321 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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MySQL Replication monitoring [closed]

Im looking for a tool that could help me and my team monitor our MySQL Replication. I would love for a tool that could alert me if Seconds_Behind_Master passes a threshold Slave_SQL_running is ...
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How to make MySQL replication reliable?

Master version: 5.5.13-1 Slave version: 5.5.14-1 Binary log format: MIXED My Slave database (~ 40GB) has been out of sync from the Master. I cannot find anything interesting in the error log. ...
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What does the base64 BINLOG statements in mysqlbinlog output mean?

I have looked over the mysqlbinlog command as a candidate for rollback method from MySQL 5.5 to MySQL 5.0. When I ran the command on one of the bin-log files in the MySQL 5.5 server, I've noticed ...
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339 views

What's the purpose of /*!*/; in mysql binlogs?

The title pretty much sums up the extent of my question. They seem to appear after every statement. Sometimes on a new line following. At other times, at the end before the ;. What's the point?
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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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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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Replication chaining with PostgreSQL

We have an unusual replication scenario and I am not sure which tool would be appropriate for that. Basically, we have a legacy non-normalized database that we want to refactor into a normalized ...
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In a MySQL Master/Slave replication, what would happen if I write to the Slave?

Several Questions Would the Slave entry remain until there is an insert/update/delete to the table on the Master that could affect the Slave? If not, how do I ensure that the Slave is in-sync with ...
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Run SQL Server Snapshot Agent automatically

I am trying to setup automatic transactional replication. Basically I have some script files that are executed after each other. They set up a replication from one server to another and this works ...
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How to move data from Primary Data File to other data file without destroying replication

I have one Database which is replicated using transactional replication. Now, I want do spare some data of that database to another partition, because my server running out of disk space. I was ...
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162 views

setting up a local database to be updated from a master database

I'm looking for an efficient way to keep multiple databases (on different servers) sync with a master database (also on a different server). Mind you I only need a one way sync (from master to all ...
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Difference between Row based and statement based replication in Mysql?

What is the Actual difference between Row based and Statement based replication I actually looking in terms of replication effect's on slave. If I am using Row based replication then whats is the ...
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Synchronise two databases (but not really)

I'm trying to design the following system. An arbitrary number of of embedded systems will each record data constantly and indefinitely. It is required that these devices upload their data to a ...
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Does MySQL support replicating all databases?

I’ve been doing some investigation into properly configuring MySQL replication. From what I understand after reading the documentation, you can only replicate specific databases, and each database ...
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Master and Slave having same id's

I am working as a remote DBA for some of the production servers. There was replication from Master to Slave. There is something changed in the scenario they have made one of the Slaves as master ...
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1answer
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PostgreSQL replication: out-of-sequence timeline ID, when former master made slave

I've configured master slave replication in PostgreSQL, following this tutorial: http://wiki.postgresql.org/wiki/Binary_Replication_Tutorial#Binary_Replication_in_6_Steps It worked fine. Now I've ...
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Problem with MySQL Master/Slave reboot when in replication

There is a master and number of slaves connected to it. Due to some patches, we have to Reboot the Master and Slave. Afterwards, we have to make sure replication is running fine. While doing this ...
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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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How To Restore A Replicated Database

I am replicating our live database using transaction replication. This is basically to have a backup copy of our database in the case of server failure. The replicated database is read only, so I ...
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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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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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368 views

How Commit works in a transactional push replication with updatable subscribers

I want to know if in a transactional push replication with updatable subscribers, a commit is only done when all subscribers have succeeded to make it, or if it only guarantees the correct commit in ...
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271 views

Dropping then adding a table to a subscription with Identity option Not for Replication causes errors

We have a Transactional Replication environment that was initialised from a backup that replicates the data for several hundred tables. When a table is altered, say a new column added, I have created ...
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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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Is it advisable to have MySQL Master/Slave running on the same physical server, on the same mysqld, sharing the same disk?

my Use-Case : The solution I am developing is very data oriented. I run a cron job every 3 hrs to read lots of records from a file, process them and store them in the database. I also need to ...
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MySQL Replication question

I have setup a master-slave replication between two MySQL servers using mysql Version 14.12 Distrib 5.0.51a, for debian-linux-gnu. Recently the replication errored out with this in the logs: ...
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Hello, I want to build up Postgresql 9.0 replication on Ubuntu 11.04 [closed]

I want to build up replication on postgresql 9.0 that too on Ubuntu 11.04. Please let me know through which method it is possible? I have tried many options including slony, streaming replication ...
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How can I check the status of transactional replication?

How can I check if there are commands waiting for being executed in the subscribers and find if there is any error occurring in my publication. I want to be able to do this programmatically so the ...
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1answer
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mysql replication deadlock slave stopped

I've a master and slave and got the slave stopped with the following error log in slave. I want to fix this and get the two servers on synch and get going again. 111128 8:42:24 [Note] Slave I/O ...
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1answer
465 views

How to perform asynchronous cascade slave replication of PostgreSQL database?

This is a feasibility/architectural question (I am no database administrator). Let's imagine a PostgreSQL database running online (like those from Heroku for example). One would like to maintain a ...
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Can an article in Sql Server replication be based upon a query?

I am looking to replicate the results of a query, is that possible or do I need to rep the tables themselves?
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The distribution agent failed to create temporary files

I'm testing transactional replication between 4 databases, 2 in one machine(Virtual) and 2 in other(also virtual). None of my virtual machines is running an anti-virus. It's all working as expected, ...
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MySQL replication problem: slave has become out of sync

I have a Master & Slave setup. Embarrassingly I managed to execute some data changing statements (INSERT and UPDATEs across 3 tables) on the Slave. Obviously this stopped the Slave replication. I ...
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MySQL Bug required remedy : [Warning] Invalid (old?) table or database name '#sql-'

We have a master & multiple slave replication in our production environment. At first, I found this error in the mysql error log on the master and later on the slave. As for all the replication, ...
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Transactional replication subscription not showing in SQL Server Management Studio [closed]

I tried to set up 3 SQL instances, one publisher 2 subscribers, to replicate data between them. I did it using the GUI wizard and all went fine in the Publisher: my publication appears under "Local ...
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In SQL Server 2008, is possible to one database subscribe 2 publications for the same database? (merge replication)

I'm trying to set up an high availability architecture using merge replication. I have 3 databases, and I'm trying to keep them all up to date with merge replication. So far I've manage to create one ...
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The process could not execute 'sp_replcmds' on 'S15415940'. Cannot execute as the database principal because the principal “dbo” does not exist [duplicate]

Can anyone show me the way to fix these error messages: The process could not execute 'sp_replcmds' on 'S15415940'. (Source: MSSQL_REPL, Error number: MSSQL_REPL20011) Cannot execute as the ...
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540 views

PostgreSQL archive_command on Windows

What is the best method for WAL log transfer on Windows? I have two servers with Windows Server 2008, PostgreSQL 9.0 64bit. Servers do not have any shared SAN disk, they are on different hosts, ...
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How do I sync instance A to instance B without losing any of the data already on instance B?

Like I said in a comment below, I'm no DBA and I'm still in a learning process. Here's my scenario : I have an Oracle server running a couple schemas (let' call it Source). What I would like to do ...
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Is it possible to have 2 or more databases active, and synchronized between them?

edit I'm testing possible solutions for database redundancy and high availability,I tested mirroring it worked fine, but lacks scalability plus there will be a lot of work in one server. Now I ...
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Replication problems after server upgrade

In transactional replication - first 8000 rows of snapshot copies to subscriber snapshot then acts like it completed successfully. Publication table has 21 million rows. Snapshot says completed ...
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707 views

Configuring MySQL slave to use SSL

I am trying to set up a MySQL slave to use replication via SSL. The my.cnf file contains the following: server-id = 1012 master-host = host master-port = port master-user = user master-password = ...
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Will improper bin-log purging leads to deletion of mysql database

We had master to master and master to multiple slave environment in one of our client location. In one of the slave Db host we had disk space issue with bin-logs. At first i deleted the bin-log files ...
6
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1answer
832 views

How long can the log reader agent run for before a restart will do it some good?

As a developer who has for the first time successfully implemented a replication topology for our production database, I'm monitoring it very closely and fretting over potential problems. I'm pleased ...