Kamran Aghayev A. is an Oracle Certified Master (10g/11g), Oracle Clusterware Certified Expert and RAC Implement Specialist (11g/12c), Oracle Certified Professional (9i,10g,11g,12c) and Oracle ACE Director working as a Data Management team head at AzerCell Telecom. He’s responsible for managing critical databases and building high-available Big Data environment, administering Hadoop clusters and using different technologies like Spark, Hive, Kafka, Scala, Impala, Flume and hands-on experience with RDBMS databases like Oracle, MS-SQL, MySql, PostgreSQL and NoSQL databases like Cassandra, Redis, MongoDB and HBase Having experience in a wide range of mission critical technologies, specializing in best practices for Oracle Exadata, Real Application Cluster, ASM, Data Guard, Performance Tuning and Backup and Recovery he's authored two books : "Oracle Backup and Recovery: Expert secrets for using RMAN and Data Pump" and "Study Guide for Oracle Certified Master 11g Exam: A Comprehensive Guide". He is President of Azerbaijan Oracle User Group (AzerOUG) and runs a popular blog http://www.kamranagayev.com where he shares his experience and contributes fairly regularly to newsgroups, forums, and user group meetings and events around the world. He is a frequent speaker and presented in many countries, most recently at the USA, Japan, Thailand, China, India, Argentina, Uruguay, Panama, Costa Rica, Mexico, Guatemala, Finland, Germany, Croatia and Turkey