Is it possible to read data only from a single node in a Cassandra cluster...
I know that cassandra have different read consistency levels but I haven't seen a consistency level which allows as read data by key only from one node. I mean if we have a cluster with a replication...
View ArticleIs it possible to read data only from a single node in a Cassandra cluster...
I know that Cassandra have different read consistency levels but I haven't seen a consistency level which allows as read data by key only from one node. I mean if we have a cluster with a replication...
View ArticleHA_ERR_FOUND_DUPP_KEY error after pt-OST optimize
I run a simple alter to optimize a table that had a lot of stale data using the pt-online-schema tool (wrapped for readability): pt-online-schema-change --alter='ENGINE=InnoDB;' --no-drop-old-table...
View ArticleTesting postgresql 9.4 streaming replication
I have setup the replication as per https://www.digitalocean.com/community/tutorials/how-to-set-up-master-slave-replication-on-postgresql-on-an-ubuntu-12-04-vps. And I see the slave is in streaming...
View Articlemysql replication takes 6 seconds
I am struggling trying to understand why MySQL 5.7.11 semi-sync replication using RBR takes around 6 seconds between 2 VMs on the same physical host. I have verified the network bandwidth b/w the 2...
View Articlemysql replication takes 6 seconds
I am struggling trying to understand why MySQL 5.7.11 semi-sync replication using RBR takes around 6 seconds between 2 VMs on the same physical host. I have verified the network bandwidth b/w the 2...
View ArticleScaling solutions for MySQL (Replication, Clustering)
At the startup I'm working at we are now considering scaling solutions for our database. Things get somewhat confusing (for me at least) with MySQL, which has the MySQL cluster, replication and MySQL...
View ArticleSQL Server 2005 Replication
I am in the process of creating Replication between 2 Remote Servers, server 1 is the Distributor and Publisher and server 2 is the Subscription. server 1 windows 2003 server 192.168.10.1 connected by...
View ArticleNon-Replicating commands from (master) Mysql 5.5.40 to (slave) MariaDB 10.0.19
CRUD replicates just fine. But we noticed that DB structure altering commands such as ALTER TABLE and/or adding/updating columns to a table and even creating new ones do not replicate to the slave at...
View ArticleNeed Suggestion for Database Replication to Online Hosting / or Database...
Hi all - thank you in advance I want your suggestion in this case I have develped a data driven system using windows application (winforms) and SQL Server 2008 R2 now i use the system in local sql...
View ArticleReplicate PostgreSQL database across two desktops
I am building a desktop application in Go that uses a Chrome window in app mode as the user interface. I have no plans to run this application from a server. The application is going to run on two...
View ArticleWrite-lock a whole table during transaction
I need to perform a delicate operation to my table in which I will solely insert, delete and select upon all of my rows and no God may interfere with the table during this operation: the table will be...
View ArticleFault tolerance in mysql servers
I have built an application as part of my UG thesis that uses mysql database (community edition). Now, my professor wants me to provide fault-tolerance to the database (by parity!!)! I argued that we...
View ArticleMongo ReplicaSet - arbiter in connection string
I'm using ReplicaSet with Mongo and when i build the connection string i have all servers hosts and ports - comma delimited. My question is, shall i add the arbiter address there as well or just the...
View ArticleOpenDJ Multi-master replication fails(Hangs at Initializing registration...
I am using OpenDJ-2.4.6 along with Oracle JDK 7.80 and I want to run Multi-master replication on 2 of my servers, the OS for these servers is Amazon Linux. The OpenDJ setup runs perfectly fine; I can...
View ArticleReplica set with SSL issues
I was able to set up a replica set with self signed certificates on Windows. However, I suspect there are some communication issues between primary and secondary. When I look at the log, I see these...
View ArticleIssue for making my Redis cluster (3 node with redis-server and...
I have 3 VPS using for making HA Redis cluster. I use my Redis cluster in my web server (in another server, and a lot of server with CLI application) and I need to have constant availability of my...
View ArticleWhat are alternatives to Replication to distibute data (Microsoft SQL Server)
Is anyone knowledgeable of alternatives to SQL Server replication? I have a scenario where separate databases will share a lot of the same data which complex queries will match against. We want to...
View ArticleLaggy slave OK to have only one system user in processlist?
In all the examples of a processlist on a mysql slave I've seen, there are two system users. I have a slave that is very far behind the master. When I do show a processlist, there is only one system...
View ArticleError while doing in replicaset in windows (mongodb)
I tried doing the replicatset in windows, but im getting the below error. I checked the mongo process and killed the existing process. Even though the error exists. help me on this pls Thx commands...
View Article