Does Apache Ignite support WAN replication?
I've been doing some experiments with Apache Ignite and I've started to look into WAN replication. By this I mean there would be 2 (or more) data centres each running an Ignite cluster. There would be...
View Articlemoving servers and mysql dbs
We have a number of websites using mysql dbs. We are moving these sites to a new server. We also moving the dbs to a new server seperate server. To make this easier we have setup master slave...
View ArticleStreaming replication from clients to central(s) server(s)
I'm not a DBA professional, sorry for obvious questions. At work, we have some platforms that get sensors informations. They should transfer values to central(s) server(s) that displayed it. Platforms...
View ArticleSQL Server considerations when backing up / restoring a database that uses...
In the event that I need to restore a database involved in replication, what considerations do I need to keep in mind? Do I need to keep backups of both the publisher and the subscriber? Can I restore...
View ArticleProblem when using gtid with MySQL replication
I am faced with this problem when using gtid in MySQL replication: When @@SESSION.GTID_NEXT is set to a GTID, you must explicitly set it to a different value after a COMMIT or ROLLBACK. Please check...
View ArticleAmazon RDS replication with external slave
I've recently configured a replication with an external MySQL master and RDS as slave but now I need to reverse that config and use RDS as master and the other instance as slave. Actually I use a vpn...
View ArticleHow do I configure AWS Aurora to separate write/read operations
I want to migrate my database instance from AWS RDS MySQL to Aurora, but I have a doubt about replication and how Aurora management the write/read operations. I have my application and I want to...
View ArticleIs it good practice to have multiple keyspaces in Cassandra?
I've Cassandra configured on Amazon EC2 having 3 nodes(instances) in single cluster. Now what I want to do is give some space on Cassandra to my clients by creating separate keyspace for each in a...
View ArticleNot only client connections? Is "MongoDB Wire Protocol" also used...
It seems that MongoDB Wire Protocol is also used for replication. Not only client/driver connections. Is that true and what are the main differences between client/driver and replication traffic? The...
View Articleaws aurora read replica have same underlying storage as primary
What does it mean to have "Amazon Aurora Replicas share the same underlying storage as the primary instance". In other sentences, it says "Amazon Aurora Replicas share the same data volume as the...
View ArticleDelete many rows from a large percona mysql db
I need a fresh opinion on the case. Any thoughts are appreciated. Input: we have a huge percona mysql (5.5) database that takes a couple of Tb (terabytes). Tables on innodb engine. More than a half...
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What data type is optimal for clustered index of a table published by using...
We have an application which stores data in SQL server database. (Currently we support SQL Server 2005 and higher). Our DB has more than 400 tables. The structure of the database is not ideal. The...
View ArticleSQL Server: subscriber as publisher and hierarchical replication
In Oracle Streams one way replication from one DB to another is a basic block for many replication topologies (N-way, hierarchical, combined and so on), and changes could be captured and applied for...
View ArticleConfiguring slave from EC2 master to Amazon RDS slave
I am configuring replication from EC2 master to Amazon RDS instance. After starting the slave, I don't see any errors but I see slave_IO: _thread is connecting. Master version:5.6.23 Slave...
View ArticleRestore/Merge a SQL Server Replication Subscriber Database
Our factory-floor PLC devices write continuously to a database OPERATION. At the end of the shift several reports are generated and the data is then summarised into an archive database and the records...
View ArticleError running custom plugin on Postgres, "output plugins have to declare...
I'm trying to create a custom output plugin for logical replication (Postgres is 9.5.4 version and I'm building the project from a Windows 8/64 bit machine - same machine where the db is installed). I...
View ArticleDelete many rows from a large percona mysql db
I need a fresh opinion on the case. Any thoughts are appreciated. Input: we have a huge percona mysql (5.5) database that takes a couple of Tb (terabytes). Tables on innodb engine. More than a half...
View ArticleWhat are options for Bi-Directional Replication of SQL Azure Database
This questions came from a developer friend who is working with SQL Azure Database. Scenario: There are two Azure DB servers, one in North America, USA region and another one in South East Asia region....
View ArticleLondiste PostgreSQL replication over slow connection
I've got a setup with a single master and two branches. Unfortunately, the network connection to the master is over a 3G wireless network. It's not terribly slow, but the latency is pretty high....
View ArticleMerge Replication Alert Warnings
I recently set up some alerts for Merge replication. There are two alerts that always show warnings. 1. Long merge over LAN connection and 2. Slow merge over LAN connection. For the first one, it won't...
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