Another consequence is tha… Internal tables Internal Table is tightly coupled in nature.In this type of table, first we have to create table and load the data. (c), 75. HBase is a key/value store. Partitioned tables can’t load the data from normal (partitioned) tables (B) a) True. When you drop an Internal table, it drops the table from Metastore, metadata and it’s data files from the data warehouse HDFS location. (B) & (D), 66. 105. 7. DROP EXTERNAL TABLE drops an existing external table definition from the database system. c) True, if source and destination are in the same cluster, d) False, if source and destination are in the same cluster, 28. What decides number of Mappers for a MapReduce job? 103. The external data sources or files are not deleted. Which of the following is the outer most part of HBase data model ( A ), 82. DUMP Statement writes the output in a file. ( B), NameNodes are usually high storage machines in the clusters. Internal tables are stored in this directory by default. ( D), a) Complex Event Processing (CEP) platforms. The schema of a relation can be examined through: (B), 55. There are many DDL commands. 23. (E), 69. 104. Dropping an External table drops just the table from Metastore and the actual data in HDFS will not be removed. The partitioned columns in Hive tables are (B) a) Physically present and can be accessed Which of the following is the correct sequence of MapReduce flow? Which of the following is not true about Name Node? Which describes how a client reads a file from HDFS? A managed table means the table data is managed by hive. Hive assumes that it has no ownership of the data for external tables, and thus, it does not require to manage the data as in managed or internal tables. When dropping an EXTERNAL table, data in the table is D. It depends on the InputFormat used for the job. c) Drops both, data and metadata . Data needs to remain in the underlying location even after a DROP TABLE. (D), 90. A. Keys are presented to reducer in sorted order; values for a given key are not sorted. b) Stock market data analysis. Technical strengths include Hadoop, YARN, Mapreduce, Hive, Sqoop, Flume, Pig, HBase, Phoenix, Oozie, Falcon, Kafka, Storm, Spark, MySQL and Java. 31.Which of the following can be used to control the number of part files ( B) in a map reduce program output directory? (D), 58. Sliding window operations typically fall in the category (C ) of__________________. Internal table are like normal database table where data can be stored and queried on. (E), 40. ( C), 74. d) both (a) and (c) 7. Which of following statement(s) are true about distcp command? Specifically it is: ( E ), 81. Pig can be used for real-time data updates. When you drop a Hive table all the metadata information related to the table is dropped. A. distcp command ALWAYS needs fully qualified hdfs paths. ( C ). This document lists some of the differences between the two but the fundamental difference is that Hive assumes that it ownsthe data for managed tables. From the options listed below, select the suitable data sources for the flume. When you drop a table from Hive Metastore, it removes the table/column data and their metadata. c) … Which interface should your class implement? 1 MB input file), d) Processing User clicks on a website e) All of the above, 64. Delete temporary objects at end of mapping. (B), 52. Counters persist the data on the hard disk. Hive managed tables stores the data in (C), 94. Specify a value for the key hive.metastore.warehouse.dir in the Hive config file hive-site.xml. You cannot directly load data from blob storage into Hive tables that is stored in the ORC format. ( D ), 15. Only one distributed cache file can be used in a Map Reduce job. In Hive,” user/hive/warehouse” is the default directory. Which describes how a client reads a file from HDFS? You want to use a custom location such as ASV. (C), b) Runs on multiple machines without any daemons, c) Runs on Single Machine with all daemons, d) Runs on Single Machine without all daemons, 72. C. The client contacts the NameNode for the block location(s). When You are developing a combiner that takes as input Text keys, IntWritable values, and emits Text keys, IntWritable values. Here are the steps that the you need to take to load data from Azure blobs to Hive tables stored in ORC format. What does “Velocity” in Big Data mean? Which of the following is not a valid Hadoop config file? An e… That means that the data, its properties and data layout will and can only be changed via Hive command. . Because that's what a managed table is, as compared to an external one. Which of the following are not possible in Hive? 102. ( C), a) Master and slaves files are optional in Hadoop 2.x, b) Master file has list of all name nodes, c) Core-site has hdfs and MapReduce related common properties, d) hdfs-site file is now deprecated in Hadoop 2.x, 73. (B), 37. Which of the following writable can be used to know the value from a mapper/reducer? suppose I have dropped an external table(EMP) the table was stored at /user/hive/satya/. C. Not until all mappers have finished processing all records. When is the earliest point at which the reduce method of a given Reducer can be called? 101. ( C), 19. As soon as at least one mapper has finished processing its input split. Which of following statement(s) are correct? The term Big Data first originated from: ( C ), 5. D. The keys given to a reducer are in sorted order but the values associated with each key are in no predictable order, Your email address will not be published. b) False. The NameNode contacts the DataNode that holds the requested data block. The NameNode then queries the DataNodes for block locations. This can be achieved as below. We do not have to provide the location manually while creating the table. Managed tables don’t allow loading data from other tables. (D), a) Combiners can be used for mapper only job, b) Combiners can be used for any Map Reduce operation, c) Mappers can be used as a combiner class, d) Combiners are primarily aimed to improve Map Reduce performance, e) Combiners can’t be applied for associative operations, c) In either phase, but not on both sides simultaneously, 36. Unlike external tables, dropping an internal table also deletes the underlying data. In the previous examples the data is stored in /page_view. (B), 30. Following are the syntaxe used for external tables: To create the table, we use the following command: 97. 1. That doesn’t mean much more than when you drop the table, both the schema/definition AND the data are dropped. How ever, when you drop the table, hive would attempt to delete the externally located data. Which of the following is/are correct? In the hive, there are two types of tables: Internal Table or Managed Table; External Table or Unmanaged Table; Managed Table/Internal Table. This is a direct load LKM and will ignore any of the target IKM. A. Combiner , A. Reducer , A. Combiner , A. Combiner . The NameNode returns the block location(s) to the client. HDFS data blocks can be read in parallel. Parameters. Which of the following are NOT metadata items? The data files are not affected. The data files permission and ownership are preserved so that the relevant external processes can continue to write in it even after failover. ( D ), d) Low specifications Industry grade hardware, 2. (E), 62. Read the statement and select the correct option: ( B). (A), 97. Most Asked Technical Basic CIVIL | Mechanical | CSE | EEE | ECE | IT | Chemical | Medical MBBS Jobs Online Quiz Tests for Freshers Experienced. (B), 44. ( C), 17. Which of the following are true for Hadoop Pseudo Distributed Mode? Which of the following Batch Processing instance is NOT an example of ( D), a) Processing 10 GB sales data every 6 hours, d) Trending topic analysis of tweets for last 15 minutes, 6. b) False . To execute this command you must be the owner of the external table. Which of the following is NOT the component of Flume? This chapter describes how to drop a table in Hive. C. Keys are presented to a reducer in random order; values for a given key are not sorted. Hive supports replication of external tables with data to target cluster and it retains all the properties of external tables. (C ), 24. Which of the following is the correct representation to access ‘’Skill” from the (A) Bag {‘Skills’,55, (‘Skill’, ‘Speed’), {2, (‘San’, ‘Mateo’)}}, 51. Which of the following type of joins can be performed in Reduce side join operation? b) Big Data Batch Processing. B. Drop the Hive staging table. This article will cover each DDL command individually, along with their syntax and examples. Consequently, dropping of an external table does not affect the data. Data can be loaded in HBase from Pig using ( D ), 85. Table A-1 LKM SQL to Hive SQOOP. Working and Creating External tables in Hive By default, in Hive table directory is created under the database directory. What is the data type of version in HBase? 32. External tables are used for external use means when the table data resides outside Hive then these tables are used. Which of the following is/are true? For an external table, If you are trying to drop a partition and as-well would like to delete the data. The client reads the data directly off the DataNode. This can be addressed by explicitly marking the table "EXTERNAL". Which of the following is true for Hive? External tables should be used when you expect the underlying data to be updated by an external source, such as an automated data upload process, or by another MapReduce operation, and you always want Hive queries to use the latest data. The mechanism used to create replica in HDFS is____________. B. Hive has a Internal and External tables. (B)& (C) &(D), a) It is the Master Machine of the Cluster, b) It is Name Node that can store user data, d) Name Node can be replaced by any Data Node Machine, 68. Required fields are marked *. If you want the DROP TABLE command to also remove the actual data in the external table, as DROP TABLE does on a managed table, you need to configure the table properties accordingly. ( D), 3. a) Tool for Random and Fast Read/Write operations in Hadoop, b) Faster Read only query engine in Hadoop, 10. If you do though it violates invariants and expectations of Hive and you might see undefined behavior. While deletion only table schema gets deleted. c) Drops both, data and metadata. The partitioned columns in Hive tables are (B) a) Physically present and can be accessed What is the optimal size of a file for distributed cache? ( D), c) True only for Apache and Cloudera Hadoop, 13. External Tables. A Map reduce job can be written in: (D), d) Any Language which can read from input stream, d) Creating multiple datasets from a single large dataset, 48. Now we learn few things about these two 1. The data still lives in a normal file system and nothing is stopping you from changing it without telling Hive about it. b) Retains metadata, but deletes data . c) Bank fraud transactions detection. Which of the following are NOT true for Hadoop? Managing External Tables. Drop the partitions -- when you drop the partitions, data pertained to the partitions will also be dropped as now this table is managed table . (E), Runs on multiple machines without any daemons, Which of following statement(s) are correct? (D ), c) NameNode keeps the image of the file system also, 18. Types of Drop Table in Hive. Partitioned tables can’t load the data from normal (partitioned) tables (B), 99. Snowflake supports integrating Apache Hive metastores with Snowflake using external tables. HDFS Federation is useful for the cluster size of: (C), 93. Indentify the utility that allows you to create and run MapReduce jobs with any executable or script as the mapper and/or the reducer? d) Retains both, data and metadata. Read the statement and select the correct options: ( A). The EXTERNAL keyword lets you create a table and provide a LOCATION so that Hive does not use a default location for this table. This case study describes creation of internal table, loading data in it, creating views, indexes and dropping table on weather data. On dropping external tables, Hive: (A) a) Retains data, but deletes metadata. When an external table is deleted, Hive will only delete the schema associated with the table. B. The DataNode that contains the requested data responds directly to the client. Option Description; DELETE_TEMPORARY_OBJECTS. (D), 41. Create a CSV file of data you want to query in Hive. On dropping managed tables, Hive: (C), 95. Replicated joins are useful for dealing with data skew. On dropping external tables, Hive: (A), 98. Creating Internal Table . Hive queries response time is in order of (C), b) Can load the data only from local file system, d) Are Managed by Hive for their data and metadata, a) Are aimed to increase the performance of the queries, c) Are not useful if the filter columns for query are different from the partition columns, 78. D. Keys are presented to a reducer in random order; values for a given key are sorted in ascending order. What is the default HDFS block size? ( A ), 21. Hive can be used for real time queries. a) OLTP Transactions. Number of mappers is decided by the (D), 39. This location is included as part of the table definition statement. Both the keys and values passed to a reducer always appear in sorted order.
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