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…
Quick question – on findAndModify() concurrency. Ex: 2 threads are trying to pull the same document at the same time (using status=pending), and assuming 1st thread gets the lock on the doc and change the status to “in-process” through findAndModify()….
Indexes are the single biggest tunable performance factor in MongoDB Absent or suboptimal indexes are the most common avoidable MongoDB performance problem. // Create an index if one does not exist db.recipes.ensureIndex ( { main_ingredient : 1 } ) //…
https://mariadb.com/kb/en/mariadb/tokudb/ https://mariadb.com/kb/en/mariadb/enabling-tokudb/ https://mariadb.com/kb/en/mariadb/tokudb-differences/ http://www.chriscalender.com/enabling-tokudb-in-mariadb-is-a-breeze/ https://mariadb.com/kb/en/mariadb/tokudb-system-variables/
If an update operation with upsert: true results in an insert of a document, then $setOnInsert assigns the specified values to the fields in the document. If the update operation does not result in an insert, $setOnInsert does nothing….
A nice comaparision of Redis vs NCache at Alachisoft This comparison is between Redis v3.0.7 and NCache 4.6. It is a detailed feature by feature comparison of both products so you can quickly see which product is weak or strong…
BigData has changed a lot of things, and how people shop is one of the bigger ones. Now, customers are used to seeing personalized recommendations for products, customized event ads, and an entire bevy of buyable goods and services curated just…
You can register for Couchbase 102: Couchbase Server & Couchbase Mobile Use Cases on May 5, 2016 11:00 AM SGT at: https://attendee.gotowebinar.com/register/2826576488407161092 Learn about the most common use cases of Couchbase Server & Couchbase Mobile and how Couchbase meets…
Installing MariaDB Enterprise Windows Packages 1. Login to http://mariadb.com and click on the My Portal link then on Downloads 2. In the Enterprise Products section, use the menus to select the version of MariaDB Enterprise you are interested in and…