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 Replication - Master Master - Single Master write

I am looking to improve our fault tolerance for our persistent store. After reading several online docs about how to set-up master <> master replication, I'd still like to ask the experts about the ...
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28 views

PostgreSQL synchronous replication time out?

I'm using PostgreSQL 9.3 with synchronous replication. I have 2 synchronous replicators and 1 async replicator. My problem is when 2 synchronous replicators are down, transaction will wait ...
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19 views

Which primary keys must be specified when using slony PostgreSQL replication?

I'm extremely green when it comes to databases, so forgive my ignorance. I've been researching ways to replicate our production Postgres DB, and I've decided to try out Slony. Since the server is ...
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20 views

Understanding correct procedure to recover master in master-slave replication in PostgreSQL

For learning, I have setup master-slave streaming synchronous replication. Pg-pool 3.3.3 is installed in one VM and it connect to 4 VMs which runs PostgreSQL 9.3, one master and 3 slaves. Replication ...
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17 views

Does PostgreSQL take time to start streaming replication after restart master?

I set streaming replication in postgresql 9.3. I have one master and 3 slaves and replication works fine. But when i restart the master server and login using postgres database, pg_stat_replication ...
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30 views

Consistent backup of large DB --single-transaction

I need to mysqldump a large DB (330 GB) in order to set up a slave for replication. Does --single-transaction allow me to dump the entire DB without shutting mysql down and keeping it down for the ...
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1answer
31 views

How Much Resources Does the BLACKHOLE Storage Engine Consume?

I'm going to add a MySQL Relay Slave which use BLACKHOLE Storage Engine. The relay slave will just filter some databases binlog to downstream slave. Our MySQL Master generates about 15G a day in ...
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1answer
36 views

Postgresql Chained Slaves and Slave Promotion

So I have a setup like Master -> Slave1 -> Slave2. Slave1 replicates from Master and Slave2 replicates from Slave1. If I promote Slave1 to master is it possible for Slave2 to continue replicating from ...
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1answer
46 views

MySQL Replication Lag Almost 23 Hours

I came into a new environment where the production DB was running on MySQL 4. Replication is usually about an hour behind but in the last few days it has been well over 24 hours behind. I'm not ...
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45 views

Subscription fails with Incorrect syntax near '9'

In my Distributor To Subscriber History I get the following error: Command attempted: 9 (Transaction sequence number: 0x0018E94F0000207A006200000000, Command ID: 59) Error messages: ...
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39 views

mysql replication on windows server

How to setup replication(Master/slave) in MySQL 5.6 while both servers are windows based? All the things i have fond are Linux based replication. kindly someone help who experienced replication with ...
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59 views

Migrating SQL Server 2008 R2 to SQL Server 2014. What are the importing replication changes? [closed]

We currently have SQL Server 2008 R2 on our server. I now have the opportunity to migrate to SQL Server 2014. The database we use isn't large. Migration of data is not a issue. The question I have ...
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2answers
345 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 ...
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56 views

mongodb replicaset

I am adding a new member in ReplicaSet and it starts initial sync bur after certain point sync break and start resync again.this process continue and never complete its initial sync.so please resolve ...
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0answers
31 views

Bucardo status does not feel if the slave is down

I am using bucardo as third party to postgresql replication between two sites. everything ok except buacrdo status <sync_name>. I have a Master-slave sync on master server. when I poweroff the ...
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1answer
273 views

MySQL asynchronous multi master replication conflict resolution

I have setup Multi Master replication, following this blog thread: http://0wned.it/geek-bits/guides/mysql-multi-master-replication/ And now it synchronizes perfectly, up until the moment the ...
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0answers
129 views

Looking for a good 3rd party Microsoft SQL replication app! [closed]

We have an existing Microsoft 2008 SQL R2 database that we need to real time replicate to an identical off-site live web database. Transactional replication and merge replication will not be able to ...
0
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1answer
46 views

Read Replicas with multiple instances of MySQL running on different ports

I have a specific need to create a single linux server which can host 4 MySQL instances with read replication. Here are a few questions I cannot seem to find answers to: Can you setup read ...
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64 views

Is there a way to replicate Postgres databases in Amazon RDS between regions?

We have a Postgres RDS instance in the AWS Oregon Region. For some supposed legal reasons, we have to host our client's European data in the Ireland AWS Region, but we need that data synchronized to ...
3
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1answer
55 views

Centralized master data shared among other several DBs

I'm researching and investigating about all possible ways to create a master data database for my portfolio of applications. To give you a quick overview, an example will come in handy: I want to ...
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15 views

MySQL - HOWTO speed up slave replication on large database / Quickly spawn slave? [duplicate]

We have a large mysql database (about 100GB on disk) that we would like to spawn a slave for. Our typical process for creating a slave is: Create a slave server Load in a mysql dump of the master ...
2
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1answer
189 views

pt-heartbeat showing “Host is blocked because of many connection errors”…but connections are well under limit

I'm running MySQL in a master-slave configuration. pt-heartbeat is showing "Host is blocked because of many connection errors"...but connections are well under limit (limit is 600 connections, MySQL ...
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1answer
32 views

MySQL replication issue when master gets restarted

I have the following environment: NodeA and NodeB in NDB cluster. NodeC InnoDB outside cluster. NodeB is replication master and NodeC is slave. I have set up replication and it works fine. The ...
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2answers
29 views

Build replication from backup not publication source

I have an interesting scenario I am trying to find a solution to. We currently have the current setup. ProductionDatabase (publisher) is the publication for transnational replication to the ...
3
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1answer
52 views

In which server does the snapshot agent run?

While configuring a publisher for replication, we execute sp_startpublication_snapshot SP and provide the publication name as a parameter to the SP. We do not specify the distribution server's ...
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1answer
213 views

SQL Server replication - set PollingInterval in sp_addmergepushsubscription_agent

I am trying to create replication subscriptions to and SQL Server 2008 R2 via a script. There are 3 subscribers so this script creates the subscriptions by calling sp_addmergesubscription and then ...
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1answer
42 views

Will Transactional Replication Work?

I have multiple site servers and a central server. Each has a Widget table with identical schema. There is currently a custom process that sends new Widget records from the site server that ...
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60 views

Replication of a remote MySQL database to local MySQL database

I'm the developer of my employers corporate private website, a HTML5/PHP/CSS powered site for company reports etc. The site, hosted on a shared hosting package, connects to a remote read-only MySQL DB ...
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63 views

Replication saying my snapshot Publication Does Not Exist. But it does exist

enter code hereI used the SQL Server (2008) wizard to create a new snapshot publication on my sever called "BlinkViewsOnly" in the BlinkDataMaster database. Publication was created successfully. I ...
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1answer
19 views

Restarting a Publisher involved in Merge replication

Our hosting provider would like restart the SQL Server that a publisher in a merge replication topology. I'm not able to clearly understand best practice for doing this from the Microsoft docs. Our ...
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73 views

“Replicate” Table structures with sp_addscriptexec

In our customers environment is a massive central server (running SQL Server Enterprise 2008R2) and some distributed PCs (running SQL Server Standard 2008R2). The central server has a replication for ...
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2k views

mysql 5.6 GTID replication 'Got fatal error 1236 from master when reading data from binary log'

I Checked SHOW SLAVE STATUS error is "'Got fatal error 1236 from master when reading data from binary log: ''The slave is connecting using CHANGE MASTER TO MASTER_AUTO_POSITION = 1, but the master ...
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1answer
32 views

In MySQL how do I grant a user access to a read replica only?

I have some users that I want to grant read only access to my database so I setup a replica server, but I don't want to grant them access to the master. I'd assume that this is a common use case, but ...
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2answers
37 views

Mysql replication with c

I have huge database on MySql and It's become more and more huge. So, Now I am facing performance issues with my database. Some of tables has millions of records in it. like my login detail table ...
2
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1answer
71 views

InnoDB: “Only one log file found” after binary import

My first one on DBA... After successful upgrading a master MySQL server 5.5 to 5.6.17 (CentOS 6 VPS serer), I done and moved my binary backups to a slave server (same version 5.6.17 but different ...
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0answers
63 views

sqlcmd returning NUL instead of NULL for tinyint column

sqlcmd -E -d MyDatabase -Q "sp_helpsubscription" -s "," -o file.csv -W -u Column 23 which is suppose to be a tinyint (subscriber_type) is output as NUL instead of NULL when the value is NULL. I ...
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115 views

SQL server replication error - the row was not found at the Subscriber

I am doing transactional replication on specific tables. I am getting an error: The row was not found at the Subscriber when applying the replicated command. (Source: MSSQLServer, Error number: ...
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1answer
214 views

sp_startpublication_snapshot Parameter(s)

I am creating a stored procedure that: Restores a DB from a .bak giving the .mdf and .ldf a new name (so we have have several copies of the same DB up (If specified in the SP's parameter) Creates ...
0
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1answer
457 views

Need a log based replication / CDC solution to publish postgres to oracle subscribers

We have a moderately large postgres 9.1 db that is currently 3TB and will likely grow much larger over the next couple of years. we need a reliable and fast solution for moving this data into either ...
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3answers
94 views

Master-master Replication with 3 Nodes

I need to configure mysql master/master replication with 3 nodes. Currently I have master/slave setup and I need to move it to master/master with 3 nodes. I have gone through some posts about ...
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1answer
19 views

Bypassed, Empty Relay Log

We have a simple 1:1 Master-Slave replication configuration. The Master crashed, but we recovered and replication seems fine (confirmed by pt-heartbeat and SHOW SLAVE STATUS) but we've picked up one ...
0
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2answers
51 views

Mysql checksum for master-slave replication returning different values, despite being identical

I've set up a master slave replication in mysql and to make sure that I know if the data starts getting out of sync I created a script that: Locks both databases on both servers. Prints the ...
2
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2answers
128 views

MySQL 5.6: Slave_IO thread stops working

Standard replication breaks for no apparent reason. mysql> SELECT @@version, @@version_comment; +---------------+----------------------------------------------------------------------------+ | ...
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1answer
56 views

Does PostgreSQL support multi-threaded replication?

Is PostgreSQL replication single-threaded ? Are there any tools to achieve multi-threaded replication ? I'm asking this since Mariadb support this and currently I'm learning both these dbs.
2
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1answer
94 views

Promotion of PostgreSQL standby and application reconnection

Background: I work for a small company. We have been using PostgreSQL on Heroku as one of our core technologies. While, in general, we've been happy with Heroku, the company has made the decision ...
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44 views

Database design for large incoming data

I've been tasked to design a database to handle a large volume of incoming traffic from sensor readings, possibly 1,000s an hour when it's at full strength. Each reading will be relatively short - ...
0
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1answer
23 views

mongodb - “replication oplog window” possibly reduced due to profiling - when profiling disabled no change?

PROBLEM I have a 3 member replica set (no sharding) running mongodb version 2.4.8. Using MMS (Mongo Monitoring) I can see that on 7th July 2014 at 12:00 my "replication oplog window" dropped from ...
2
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1answer
142 views

Can I replicate a database from SQL Server 2012 to SQL Server 2014 (with 2014 distributor)?

I am planning to have database replication running from SQL Server 2012 (publisher) to SQL Server 2014 (both distributor and subscriber) -- pull replication. Has anyone done this type of ...
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41 views

mongodb master slave replication

I Have Setup master slave replication in mongo its working fine for few month then after that suddenly replication fails.I have started again with initial sync but during sync after a specific point ...
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1answer
96 views

Huge size on mongodb's gridfs. Should I compact ?

I'm running mongodb and grid.fs to store small files (less than 20mbs). These are part of a replica set. I currently have more than 350000 files stored. I've noticed that the chunks collection takes ...