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In the previous post we saw when a node in replicaset lost, the secondary nodes become a primary and all data is available. In this post we will see what if , if a shard is completely lost. A picture looks like this. As the data is distributed across the shards, if a […] In MongoDB the high availability is called as basic availability, means in event a primary replicaset lost , the secondary can become primary with in that replicaset. But when the whole shard is down (including all nodes within that replicaset) then there is no High Availability, the data is partially available with respects to the […] With previous post, we have configured the two shards with each having replicaset rs0 and rs1. In this post we will insert some data and observe how the data distribution is happening between shards. To do the data distributed, firstly the database must have the sharding enabled secondly, the collection which data need to […] In this post we will see how to Add a new shard shard2 and new replicaset rs1 Create Directories Create Config Files Start the instances in replicaset rs1 add the instances for replication to replicaset rs1 add the replicaset rs1 to shard The final diagram in my single host, Mongos , MongoC, MongoD with replicaset […] In previous post we saw, to create a replicaset like standby in standalone server. Basically with a replicaset the read/writes can be achieved via primary node and secondary nodes are inaccessible, this creates a concurrency issues with single node cluster. So we create a shard i.e data partitioning across nodes. The data will be distributed […] In Previous post we saw, how to install MongoDB and Create a standalone database. In this post we will see how to achieve high availability in MongoDB by using replicasets. In MongoDB the high availability is acheived by using replicaset as like Standby in Oracle. They are called as Primary and Secondary Replicaset. Whenever there […] In this post, we will see how to create a standalone MongoDB Instance. Installation is pretty straight forward just download and modify few configuration options and start the instance. This is just to prepare and know ourself, whilst the next posts will be continuation of this post , to convert the single instance to […] Welcome to first Post on MongoDB. Given my experience over RDBMS during past decade, exploring the current NOSQL database technologies and keep ourself updated. This will not only help ourselves but also enable us to know where to use this, since majority NOSQL databases are not fit for everything, they are customised and fit […] Update: 17 nov. AWS announced the cloudwatch metrics now stores until 15 months read this. Oh AWS world its ever chaning….. https://aws.amazon.com/about-aws/whats-new/2016/11/cloudwatch-extends-metrics-retention-and-new-user-interface/ all aware, AWS CloudWatch metrics only hold for two weeks in console and beyond that you cannot analyse what happened unlike our other monitoring tools. For those who are new to RDS […] Folks, Finally, The long awaited feature AWS RDS Stop/Start database feature is available with Amazon RDS, As of now you can only modify / terminate but cannot stop / start. Check out your console and you see option to stop and start. Seems not officially stated but available in console. 🙂 Enjoy -Thanks […] |
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Oracle 23c New Features for DBA's
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