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A database user having DBA role not able to create a table from package, it is hard to believe first but this is how it works. If a procedure (or a procedure inside a package) is executed roles are disabled automatically and so all grants associated…

Java provides two ways of locking mechanism to deal with multiple threads accessing shard resources in concurrent environment.Implicit locking and explicit locking. Refer this for more detail about Explicit and implicit locking in Java . The main age…

Mapreduce, a data processing framework(engine), can be used to analyse various kinds of data (logs, feedbacks, sales details, etc) sources. In previous post, we analyses time-temperature statistics and generates report with max/min temperature for var…

1.  Hadoop Mapreduce word count example - execute Wordcount jar on single node cluster 2.  Mapreduce program in eclipse - Generate hadoop2x-eclipse-plugin and word count example  3.  MapReduce :  Find total and average salary of employees  4. …

Apache Spark is a general-purpose cluster computing system to process big data workloads. It is very possible to use spark with Hadoop HDFS, Amazon EC2 and others persistence storage system including local file system. For leaning Apache spark, it is …

Join is very commonly used operation in relational add non-relational databases.It gives flexibility to use different result set and obtain some other meaningful results.In this post we will understand how to use Distributed cache in hadoop and write…