Apache Hadoop is an open source software framework used to develop data processing applications which are executed in a distributed computing environment. Applications built using HADOOP are run on large data sets distributed across clusters of commodity computers. Commodity computers Continue Reading..
Hbase is one of NoSql column-oriented distributed database available in apache foundation. HBase gives more performance for retrieving fewer records rather than Hadoop or Hive. It’s very easy to search for given any input value because it supports indexing, transactions, Continue Reading..
HBase is an open-source, column-oriented distributed database system ina Hadoopenvironment. Initially, it was Google Big Table, afterward, it was re-named as HBase and is primarily written in Java. Apache HBase is needed for real-time Big Data applications. HBase can store massive amounts Continue Reading..
Indexes are very important in any database, and with MongoDB it’s no different. With the use of Indexes, performing queries in MongoDB becomes more efficient. If you had a collection with thousands of documents with no indexes, and then you Continue Reading..
MongoDB provides the update() command to update the documents of a collection. To update only the documents you want to update, you can add a criteria to the update statement so that only selected documents are updated. The basic parameters Continue Reading..
Mongo DB provides query modifiers such as the ‘limit’ and ‘Orders’ clause to provide more flexibility when executing queries. We will take a look at the following query modifiers MongoDB Limit Query Results This modifier is used to limit the Continue Reading..
When the db.collection.find () function is used to search for documents in the collection, the result returns a pointer to the collection of documents returned which is called a cursor. By default, the cursor will be iterated automatically when the result of Continue Reading..
The method of fetching or getting data from a MongoDB database is carried out by using queries. While performing a query operation, one can also use criteria’s or conditions which can be used to retrieve specific data from the database. Continue Reading..
In MongoDB, _id field as the primary key for the collection so that each document can be uniquely identified in the collection. The _id field contains a unique ObjectID value. By default when inserting documents in the collection, if you Continue Reading..
The “insert” command can also be used to insert multiple documents into a collection at one time. The below code example can be used to insert multiple documents at a time. The following example shows how this can be done, Continue Reading..