vegan) just to try it, does this inconvenience the caterers and staff? 1. find out the path of the hive tables: for example, find the path for table r_scan1, Note: The results you get for this query would be 100% correct only if all the tables are having their stats updated. As user bigsql: 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. of Hive that Spark SQL is communicating with. Step 1: Show the CREATE TABLE statement Step 2: Issue a CREATE EXTERNAL TABLE statement Step 3: Issue SQL commands on your data This article shows how to import a Hive table from cloud storage into Azure Databricks using an external table. When an external table is dropped in Hive? 05:16 PM, Find answers, ask questions, and share your expertise. These materialized views use the default file format configured in the optional hive.storage-format catalog configuration property, which defaults to ORC. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? Jason Dere (JIRA) [jira] [Updated] (HIVE-19334) Use actual file size . If a managed table or partition is dropped, the data and metadata associated with that table or partition are deleted. Otherwise, it can . 01-17-2017 I tried Googling and searching the apache.org documentation without success.). So far we have been inserting data into the table by setting the following properties hive> set hive.exec.compress.output=true; hive> set avro.output.codec=snappy; However, if someone forgets to set the above two properties the compression is not achieved. What are the compression techniques in Hive? click browse to upload and upload files from local. This website uses cookies to improve your experience while you navigate through the website. After 3 replicas it is 99.4GB. hive> describe extended bee_master_20170113_010001> ;OKentity_id stringaccount_id stringbill_cycle stringentity_type stringcol1 stringcol2 stringcol3 stringcol4 stringcol5 stringcol6 stringcol7 stringcol8 stringcol9 stringcol10 stringcol11 stringcol12 string, Detailed Table Information Table(tableName:bee_master_20170113_010001, dbName:default, owner:sagarpa, createTime:1484297904, lastAccessTime:0, retention:0, sd:StorageDescriptor(cols:[FieldSchema(name:entity_id, type:string, comment:null), FieldSchema(name:account_id, type:string, comment:null), FieldSchema(name:bill_cycle, type:string, comment:null), FieldSchema(name:entity_type, type:string, comment:null), FieldSchema(name:col1, type:string, comment:null), FieldSchema(name:col2, type:string, comment:null), FieldSchema(name:col3, type:string, comment:null), FieldSchema(name:col4, type:string, comment:null), FieldSchema(name:col5, type:string, comment:null), FieldSchema(name:col6, type:string, comment:null), FieldSchema(name:col7, type:string, comment:null), FieldSchema(name:col8, type:string, comment:null), FieldSchema(name:col9, type:string, comment:null), FieldSchema(name:col10, type:string, comment:null), FieldSchema(name:col11, type:string, comment:null), FieldSchema(name:col12, type:string, comment:null)], location:hdfs://cmilcb521.amdocs.com:8020/user/insighte/bee_data/bee_run_20170113_010001, inputFormat:org.apache.hadoop.mapred.TextInputFormat, outputFormat:org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat, compressed:false, numBuckets:-1, serdeInfo:SerDeInfo(name:null, serializationLib:org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe, parameters:{field.delim= , serialization.format=Time taken: 0.328 seconds, Fetched: 18 row(s)hive> describe formatted bee_master_20170113_010001> ;OK# col_name data_type comment, entity_id stringaccount_id stringbill_cycle stringentity_type stringcol1 stringcol2 stringcol3 stringcol4 stringcol5 stringcol6 stringcol7 stringcol8 stringcol9 stringcol10 stringcol11 stringcol12 string, # Detailed Table InformationDatabase: defaultOwner: sagarpaCreateTime: Fri Jan 13 02:58:24 CST 2017LastAccessTime: UNKNOWNProtect Mode: NoneRetention: 0Location: hdfs://cmilcb521.amdocs.com:8020/user/insighte/bee_data/bee_run_20170113_010001Table Type: EXTERNAL_TABLETable Parameters:COLUMN_STATS_ACCURATE falseEXTERNAL TRUEnumFiles 0numRows -1rawDataSize -1totalSize 0transient_lastDdlTime 1484297904, # Storage InformationSerDe Library: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDeInputFormat: org.apache.hadoop.mapred.TextInputFormatOutputFormat: org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormatCompressed: NoNum Buckets: -1Bucket Columns: []Sort Columns: []Storage Desc Params:field.delim \tserialization.format \tTime taken: 0.081 seconds, Fetched: 48 row(s)hive> describe formatted bee_ppv;OK# col_name data_type comment, entity_id stringaccount_id stringbill_cycle stringref_event stringamount doubleppv_category stringppv_order_status stringppv_order_date timestamp, # Detailed Table InformationDatabase: defaultOwner: sagarpaCreateTime: Thu Dec 22 12:56:34 CST 2016LastAccessTime: UNKNOWNProtect Mode: NoneRetention: 0Location: hdfs://cmilcb521.amdocs.com:8020/user/insighte/bee_data/tables/bee_ppvTable Type: EXTERNAL_TABLETable Parameters:COLUMN_STATS_ACCURATE trueEXTERNAL TRUEnumFiles 0numRows 0rawDataSize 0totalSize 0transient_lastDdlTime 1484340138, # Storage InformationSerDe Library: org.apache.hadoop.hive.ql.io.parquet.serde.ParquetHiveSerDeInputFormat: org.apache.hadoop.hive.ql.io.parquet.MapredParquetInputFormatOutputFormat: org.apache.hadoop.hive.ql.io.parquet.MapredParquetOutputFormatCompressed: NoNum Buckets: -1Bucket Columns: []Sort Columns: []Storage Desc Params:field.delim \tserialization.format \tTime taken: 0.072 seconds, Fetched: 40 row(s), Created Enabling SNAPPY compression in Hive COMPRESS=SNAPPY table property can be set to enable SNAPPY compression. What does hdfs dfs -du -s -h /path/to/table output? hive> select length (col1) from bigsql.test_table; OK 6 Cause This is expected behavior. in OLAP and OLTP environment along with DB role . 99.4 is replica of the data, Created This command should also help you get the size of HIVE table : I was wondering if stats were needed to have describe extended output the actual file size. It is providing the MySQL solution on top of the HDFS data. Where does the data of a hive table gets stored? The totalSize record indicates the total size occupied by this table in HDFS for one of its replica. "SELECT * FROM records r JOIN src s ON r.key = s.key", // Create a Hive managed Parquet table, with HQL syntax instead of the Spark SQL native syntax, "CREATE TABLE hive_records(key int, value string) STORED AS PARQUET", // Save DataFrame to the Hive managed table, // After insertion, the Hive managed table has data now, "CREATE EXTERNAL TABLE hive_bigints(id bigint) STORED AS PARQUET LOCATION '$dataDir'", // The Hive external table should already have data. That means this should be applied with caution. Yeah, you are correct. i got the output. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. numRows=26295075, totalSize=657113440, rawDataSize=58496087068], solution, though not quick 01-09-2018 The threshold (in bytes) for the input file size of the small tables; if the file size is smaller than this threshold, it will try to convert the common join into map join. On a single core of a Core i7 processor in 64-bit mode, it compresses at about 250 MB/sec or more and decompresses at about 500 MB/sec or more. If the PURGE option is not specified, the data is moved to a trash folder for a defined duration. Hands on experience on SQL SERVER 2016, 2014, SSIS, SSRS, SSAS (Data Warehouse, DataMart, Dimensional Modelling, Cube Designing and deployment), Power BI, MSBI and SYBASE 12.5. Can we check size of Hive tables? Available in extra large sizes, a modern twist on our popular Hive # | 5| val_5| 5| val_5| What sort of strategies would a medieval military use against a fantasy giant? Find centralized, trusted content and collaborate around the technologies you use most. Did this satellite streak past the Hubble Space Telescope so close that it was out of focus? How do you remove Unfortunately Settings has stopped? This So not exactly this table is X size. # |238|val_238| Create Spark Session with Hive Enabled will compile against built-in Hive and use those classes for internal execution (serdes, UDFs, UDAFs, etc). This article shows how to import a Hive table from cloud storage into Databricks using an external table. # # Aggregation queries are also supported. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. This How to notate a grace note at the start of a bar with lilypond? It is a good question. If the location is not specified, by default all metadata gets stored in this path. 11:46 AM, Du return 2 number. This cookie is set by GDPR Cookie Consent plugin. How do you ensure that a red herring doesn't violate Chekhov's gun? Jason Dere (JIRA) . It is difficult to find table size in hive using query. I have many tables in Hive and suspect size of these tables are causing space issues on HDFS FS. // Order may vary, as spark processes the partitions in parallel. Analytical cookies are used to understand how visitors interact with the website. For example:, if partition by date (mm-dd-yyyy). "SELECT key, value FROM src WHERE key < 10 ORDER BY key". hive1 by default. For Big SQL, the CHARACTER_LENGTH function counts characters, and for Hive, the OCTET_LENGTH function counts bytes. Note that, Hive storage handler is not supported yet when Created on creates a directory configured by spark.sql.warehouse.dir, which defaults to the directory These cookies track visitors across websites and collect information to provide customized ads. However, you may visit "Cookie Settings" to provide a controlled consent. the input format and output format. Load large csv in hadoop via Hue would only store a 64MB block, Cannot query example AddressBook protobuf data in hive with elephant-bird, Hive not running Map Reduce with "where" clause, Rhive query inserts multiple entries into Hive table for a single row insert when run via an Oozie job, Follow Up: struct sockaddr storage initialization by network format-string, Identify those arcade games from a 1983 Brazilian music video, How to handle a hobby that makes income in US. 02:07 PM. Hive query to quickly find table size (number of rows), How Intuit democratizes AI development across teams through reusability. # The items in DataFrames are of type Row, which allows you to access each column by ordinal. This command shows meta data about the hive table which includes list of columns,data types and location of the table.There are three ways to describe a table in Hive. 07-09-2018 To gather statistic numRows / rawDataSize for Parquet and ORC format, Flink will only read the file's footer to do fast gathering. Once done, you can execute the below query to get the total size of all the tables in Hive in. Hive is an ETL and Data warehousing tool developed on top of the Hadoop Distributed File System. How can I delete a hive database without using hive terminal? # |key| value| We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. 1. We do not have to provide the location manually while creating the table. SAP is the largest non-American software company by revenue, the . How do I align things in the following tabular environment? 1) SELECT key, size FROM table; 4923069104295859283. Connect and share knowledge within a single location that is structured and easy to search. If Hive dependencies can be found on the classpath, Spark will load them 2. Mutually exclusive execution using std::atomic? // The results of SQL queries are themselves DataFrames and support all normal functions. 07-10-2018 @DanielLangdon are the units of rawDataSize bytes, blocks or something else? 10:14 PM, Created - the incident has nothing to do with me; can I use this this way? -- gives all properties show tblproperties yourTableName -- show just the raw data size show tblproperties yourTableName ("rawDataSize") Share Improve this answer Follow answered Mar 21, 2016 at 13:00 Jared 2,894 5 33 37 3 As a part of maintenance, you should identify the size of growing tables periodically. Types of Tables in Apache Hive. 12:00 AM, Created HOW TO: Find Total Size of Hive Database/Tables in BDM? Why do small African island nations perform better than African continental nations, considering democracy and human development? to be shared are those that interact with classes that are already shared. 09:28 AM, Du return 2 number. Connect and share knowledge within a single location that is structured and easy to search. 01:40 PM. . Step 3: Issue SQL commands on your data. 3 Describe formatted table_name: 3.1 Syntax: 3.2 Example: We can see the Hive tables structures using the Describe commands. # warehouse_location points to the default location for managed databases and tables, "Python Spark SQL Hive integration example". spark-warehouse in the current directory that the Spark application is started. 4 What are the compression techniques in Hive? [COMMENT table_comment] [ROW FORMAT row_format] [STORED AS file_format] Example Is there a way to check the size of Hive tables in one shot? But unfortunately, count() is the only way to do. totalSize: Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. The HDFS refined monitoring function is normal. Yes, you can set the properties in the table. # +--------+ Procedure Log in to FusionInsight Manager. adds support for finding tables in the MetaStore and writing queries using HiveQL.
hive table size
Copyright © 2023 Emiliano León