Cassandra cannot update row when one node is down
First time Cassandra user and obligatory issue. Cassandra is running in a 2 node cluster with replication factor=2 and row update fails when 1 node is down. Keyspace is defined as below. CREATE...
View ArticleWhat is the best way to replicate data between 7 branches and center?
I am going to develop system which need to have Head office and the branches. branches data should be send to head office and head office people should be able to update branches data. Those update...
View Articlereplication between SQL Server and MySQL server
I want to setup replication between SQL Server and MySQL, in which SQL Server is the primary database server and MySQL is the slave server (on linux). Is there a way to setup such scenario? Help me .
View ArticleMySQL Exec_Master_Log_Pos value greater than Read_Master_Log_Pos
I am trying to repair one MySQL replication setup. One of the database's table at slave side is deleted and the updates from master side are received but because of missing table these updates are not...
View ArticleFinding differences between a master and slave when pt-table-sync fails
I have a table that's showing some differences on a master and slave according to pt-table-checksum (PTC). I've found some verifying differences beyond that. Certain tables in the mix have composite...
View ArticleMongo DB Replica set Stuck at RECOVERING state
We have created a replica set and now the problem is 2 members of replica set [3 members set] are in recovering mode from 48 hours. Initially the size of recovering nodes was increasing and now even...
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 ArticleWeb Synchronization Wizard - Merge Replication
I have the 2PC, each is running SQL Server 2012. Computer A has the ISS 8.5 setted up as Microsoft TechNet suggeting regarding WebSync. All passed smoothly. Distribution is setted up and publishing is...
View ArticleRedis : Slave to master communication
I had a local server with a Redis, which I used as a broker for my messages between multiple processes. I am now in the distribution phase, where each process is located far away from the other...
View ArticleDDL Statements does not replicated on SQL
I don't have much experience on SQL replication(SQL Server 2014). My client have a replication process which was created by his previous contractor. It worked well and suddenly it stopped replicating...
View ArticleHow to implement filtered replication in couchdb by user with common...
i have a server couch database with data of all users. I would like to replicate data of a particular user from this to another database (couch/pouch) on the client. i can't use different databases for...
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...
View ArticleOpenLDAP: Why would you ever use refreshOnly for replication?
I'm reading about OpenLDAP replication and I don't understand why you would use refreshOnly mode vs. refreshAndPersist mode. I've tried to do some searching online, but wasn't able to find any...
View ArticleMySQL failover - Master to Master Replication
My company is trying to implement a MySQL failover mechanism, to achieve higher availability in our webservices tier - we commercialize a SaaS solution. To that end we have some low-end VMs scattered...
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 ArticleMerge Replication API with SQL Server 2012 / 2014
We are using SQL Server 2008 with merge replication. Our business application uses the rmo api, which we have installed with SQL Server Feature Pack 2008 SP3 and there the package sql_rmo.msi. Now we...
View ArticleCannotGetMongoDbConnectionException: Failed to authenticate to database
In the replica-set Mongo Shell, use products;db.auth('worker'.'a*******6'); is alright, but in spring-data-mongondb, I encountered the following problem: Exception in thread "main"...
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Permanent count of waiting tasks (2) in Activity monitor
Now I'm observing in Activity Monitor permanent count of waiting tasks: and at "Resource waits" tab I see next: so, my question is: How to find and resolve this wait tasks? I suspect that it related...
View ArticlePostgreSQL or MySQL for large Database with images stored in tables? [on hold]
currently we are using Mysql/innoDB as database in our company and we are considering a switch to PostgreSQL in hope for better performance. here's our conditions: the DB size could get to maximum 3...
View ArticleMongoDB replica set configuration error
I am trying to set up a MongoDB replica set on Digital Ocean. I edited /etc/mongo.conf and specified replica set id: replSet=rs1 and did not change anything else. I did rs.initiate() on the first...
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