1.What makes MongoDB the best? MongoDB is considered to be best NoSQL database because of :Document-oriented (DO) High performance (HP) High availability (HA) Easy scalability Rich query language 2.How to do transactions/locking in MongoDB? MongoDB does not use conventional locking…
Most will say no , because it is NoSQL ( free of schemas and joins ) . But from the new version of MongoDB (3.2) , the answer is YES! Visit the blog… We all know that one of…
[dbversit@dbversity bin]$ ps -ef | grep mongo | grep -v grep dbversit 6471 1 0 04:55 ? 00:00:45 ./mongod –configsvr –dbpath /tmp/mongodb/config1 –logpath /tmp/mongodb/logs/config.log –port 30001 –config /etc/mongod.conf dbversit 7165 1 3 05:00 pts/2 00:07:47 ./mongod –shardsvr –replSet rs –dbpath…
Why MongoDB have variant fragmented space in a same ReplicaSet members ? When we’ve 3 node replica set (PSS) and do have bulk updates and delete operations, though they’ll be in sync through same OpLog mechanism – why do I…
While importing attached JSON array as below, I see below errors – Sample records from the JSON file are below. [{ “_id” : { “$oid” : “52fa519da6342a0dcd97222a” }, “active” : true, “from” : { “$date” : “2000-01-01T00:00:00.000-0500” }, “kind” :…
With MongoDB Compass, you can visually explore your data and run ad-hoc queries in seconds. Compass empowers you to make smarter decisions about indexing, document validation, and more. No command line needed Screen shots : MongoDB_Compass_Overview Know your data with…
[ root @ dbversity : /home/mariadb ] ll -lhtr total 29M -rw-r–r– 1 root root 1.6K May 19 05:45 install -rw-r–r– 1 root root 25K May 19 05:45 rh-mariadb101-mariadb-config-10.1.13-1.el6.x86_64.rpm -rw-r–r– 1 root root 60K May 19 05:45 rh-mariadb101-mariadb-common-10.1.13-1.el6.x86_64.rpm -rw-r–r– 1…
Webinar | Thursday, May 26th How the ICIJ Used Neo4j to Unravel the Panama Papers Webinar Thursday, May 26th 9:00 PDT | 18:00 CEST Register here for the On-Demand Recording Register Now Involving 2.6 TB of data and…
Download at : DBVersity_MongoDB_Assessment_papers DBVersity MongoDB Assessment MongoDB manages collections of _________ like documents which are internally stored in binary format referred to as BSON? XML JavaScript HTML JSON All of above Purpose of MongoDB Replication…
Consider requirement that we have to be able to recreate/query any version of a document that ever existed in a particular collection. So we start out with: { docId: “A”, version: 1, color: “red”, locale: “USA” } If we need…