Replication on AlwaysON
I have two SQL servers 2014 Ent.edition (SERVER A, and SERVER B) designed for AlwaysOn Availability Group. There are 5 databases in the AG. I have been told that we need to replicate one of the...
View ArticleMongoDB unrecoverable replication error
One of member of my MongoDB replica set decided it would not restart, with the following error (reformatted for readability): Starting rollback due to OplogStartMissing: our last op time fetched:...
View ArticleHigh Availability in PostgreSQL-XL
How to setup a minimum number of slaves being safely replicated to by master before master acknowledge commits to clients in PostgreSQL-XL 9.5 cluster? Also, can we use repmgr or zookeeper to...
View ArticleIs it possible to have replicated JVMs so that i can simply flip over from...
Is it possible to replicated a complete JVM and in case of failover simply flip the load to the replicated JVM? If yes then how can we do it?
View ArticleHigh Availability for MariaDB and Postgres : replication or active-passive (SAN)
During the last weeks I did a lot of research on High Availability for Postgres and MariaDB. Both by my own research and also recommended by vendor's, replications seems to have more advantages. Some...
View ArticlePostgreSQL streaming replication lag for synchronous standbys
We use PostgreSQL 9.5 in a master + synchronous hot-standby setup, i.e., using synchronous_commit = on and using synchronous_standby_names='*'. Consequently, the standby has sync_state = sync in the...
View ArticleMySQL Replication - stored procedures gone from sleve
New to MySQL. Just setup a master-slave replication. Took a full dump from Master and restored on Slave and then followed the process to setup replication and seems to be working fine as far as the...
View ArticleErrno 1782 on MySQL replication
I have 3 servers configured with multi-source replication (my replication topology). It worked fine for 2 weeks, but now I getting error on a slave (server C at image): Error executing row event:...
View ArticleIs Hinted Handoff a better choice than Re-replication for consistency>ANY?
In Cassandra, Hinted Handoff(HH) only happens when consistency level can be met. Also, hints are unreadable to clients. With consistency level > ANY, using HH can improve neither write nor read...
View ArticleTransaction Replication on AlwaysOn
In our AlwayOn environment I have two SQL servers 2014 Ent.edition (SERVER A, and SERVER B). I setup a transaction replication for [database A ], pointing to listener which shouldn't cause any issue...
View ArticleIf a user is created in a primary postgres database, will the user be copied...
Say a user is created in postgres 9.6 with some specific privilege set: CREATE USER foo_user WITH ENCRYPTED PASSWORD 'foo_password'; GRANT CONNECT ON DATABASE bar_db TO foo_user; GRANT USAGE ON SCHEMA...
View ArticleMongoDB can't add new replica set member [rsSync] SEVERE: Got signal: 6
I have a replica set and I added a new member to the set. The initialSync begins for the new member and rs.status (on primary) shows STARTUP2 as status. However, after a long enough time, there's a...
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A timeout occured after 30000ms selecting a server using CompositeServerSelector
I try to deploy my mongo database in mongolabs , everything works fine, and i create a new database in mongo labs, Please see my connectionstring. public DbHelper() { MongoClientSettings settings =...
View ArticleUsing mysqldump to initialize slave database
I've facing an issue I don't really understand. I wan't to synchronize a slave MariaDB database to a master one. I try to use the mysqldump option --master-data=1 which is adding a "CHANGE MASTER TO"...
View ArticleMySQL 5.7 Replication failover in Master-Master configuration in RHEL
Asynchronous Replication Scenario ( Binary Logging Method) : Primary Node <-----> Secondary Node Write is enabled on Primary node and Read is enabled on both node. Problem : How to do automatic...
View ArticleCouchDB to PouchDB replicate() fires only once
I have local PouchDB database, and remote (http) POUCHDB instance. I fill local db from remote with replicate method (live: false, retry: false), I need just to get all docs from remote instance to...
View ArticlePostgreSQL 9.6 log shipping replication stuck on startup
Overview We have been trying to restore replication between a Master and Replication server for a while, but the individual who had set up has left and we've been working at it for a while. In brief,...
View ArticleHow do I synchronize rows in tables in remote databases?
I'm actually developing a synchronization tool in vb.net, I have two database that have on each table records field GUID, this field help to have the same PK on both database. On each record there is...
View ArticleSlave_IO_Running: Connecting in Master-Slave Replication
I was trying to implement Master-Slave Database Replication on two systems. I followed the steps from the following linkshttps://www.youtube.com/watch?v=DmQWcU2INqQ andMaster Slave Replication But in...
View ArticleWhy MySQL Group Replication slave nodes have high delay with write node?
MySQL 5.7.17 MGR deploy in single-primary mode, 3 node all one one machine, the same configuration. And then we test insert on the primary node and observe that the slave nodes have high delay with...
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