Select a cluster. The query takes the sum of total size of all the Hive tables based on the statistics of the tables. Env: Hive metastore 0.13 on MySQL Root Cause: In Hive Metastore tables: "TBLS" stores the information of Hive tables. Get-WmiObject win32_logicaldisk | Select-Object @{n = "Size / GB"; e ={[math]:: truncate ($_. The Tables folder displays the list of tables in the defaultdatabase. Just a guy working in Unix based Technical support since last 5+ years. Estimated Table Size: The SQL query to know the estimated table size in Oracle is SELECT (row_size_in_bytes * cnt_of_rows)/1000/1000/1000 table_size_in_GB FROM ( SELECT table_name , (sum (data_length) / 1048576) * 1000000 row_size_in_bytes FROM user_tab_columns WHERE table_name=UPPER('&Enter_Table_Name') GROUP BY table_name ) A, (SELECT count(1) cnt_of_rows FROM &Enter_Table… I'm having 120 millions records in Hive Table. Default Value: 999 prior to Hive 0.14.0; 1009 in Hive … Checking the different parameters of the table in Hive Metastore table — TABLE_PARAMS for the same Hive table with id — 5783. The totalSize record indicates the total size occupied by this table in HDFS for one of its replica. Note that, table size will be mentioned in “bytes”. CREATE TABLE hive_array_table (name String, sal int, age array ) ROW FORMAT DELIMITED FIELDS… To access the disk usage table: Login to SSMS. 3. hdfs dfs -df -s -h . a. When you are connected to your own schema/user. index (primary key) in size_test_table. This method is useful when you want to identify the size of known table. We get the table size … But when there are many databases or tables (especially external tables) with data present in multiple different directories in HDFS, the below might help in determining the size. Given an input size of 1,024 MB, with 128 MB of data … select schema_name(tab.schema_id) + '.' The next point © which is the hdfs du -s can be compared to check this. source -- chunk size=8GB. The below steps when when performed in the Hive Metastore DB would help you in getting the total size occupied by all the tables in Hive. Remember, the result derived above is for only one replication. hive.exec.reducers.max. The syntax of the du command is as follows: hdfs dfs-du -h /"path to specific hdfs directory" You can check for tables with this value as false to see if there are any tables in Hive those might have missing statistics. The easiest way to find the size of all the tables in a database is to use the SQL Server Management Studio’s (SSMS) standard report called Disk Usage by Table. 1. find out the path of the hive tables: for example, find the path for table r_scan1, hive> describe formatted r_scan1; => Location: maprfs:/hive/username.db/r_scan1. calculating the size of one table and one schema. b. + tab.name as [table], cast(sum(spc.used_pages * 8)/1024.00 as numeric(36, 2)) as used_mb, cast(sum(spc.total_pages * 8)/1024.00 as numeric(36, 2)) as allocated_mb from sys.tables tab inner join sys.indexes ind on tab.object_id = ind.object_id inner join sys.partitions part on ind.object_id = part.object_id and ind.index_id = part.index_id inner join … Statistics may sometimes meet the purpose of the users' queries. The default in Hive 0.14.0 and earlier is 1 GB, that is, if the input size is 10 GB then 10 reducers will be used. The command will show you the space (in bytes) used by the files that match the file pattern you specify. By default, we can check the size of a table or database by using the hdfs command as below. Table: Table in hive is a table which contains logically stored data. Select Edit to modify the value to 128 MB (134,217,728 bytes), and then press Enter to save. The Databases folder displays the list of databases with the default database selected. If Table1 is a partitioned table, then for basic statistics you have to specify partition specifications like above in the analyze statement. source2 -- chunk size=256MB(default in mfs). One of the key use cases of statistics is query optimization. While executing select statement with some where condition or performing any avg,max(mathematical operation) query is executing taking 2 to 3 hours.Do I missing some configuration in Hive.Because its seems very unusual that query taking this much time.I am using Hortonworks 2.5 Sandbox on Microsoft Azure Service and it is Single Node. How to Calculate the size of one Table or one Schema. Below is the sample DESCRIBE EXTENDED table output. Components of Hive: Meta store: Meta store is where the schemas of the Hive tables are stored, it stores the information about the tables and partitions that are in the warehouse. hive_info.rb. The script below will retrieve the size of all your databases in MB and GB. To list the sizes of Hive tables in Hadoop in GBs: 1. 2. Users can quickly get the answers for some of their queries by only querying stored statistics rather than firing long-running exec… For example, if your HDFS block size is 256MB, even if n% of input size is only 100MB, you get 256MB of data. [This can be checked in the table — TABLE_PARAMS in Metastore DB that I have also mentioned below (How it works?.b)]. The param COLUMN_STATS_ACCURATE with the value true says the table's statistics property is set to true. For example, from the Databases menu: 1. This article provides the SQL to list table or partition locations from Hive Metastore. select segment_name,sum (bytes)/1024/1024/1024 GB from user_segments where segment_type='TABLE' and segment_name=upper ('&TABLE_NAME') group by segment_name; QUERY 2: Check table size from dba_segments if you are connected using sysdba. You can view the size of the files and directories in a specific directory with the du command. Output: 133 K /apps/cnn_bnk/customer1_txn.txt Note: The results you get for this query would be 100% correct only if all the tables are having their stats updated. Login into Hive Metastore DB and use the database that is used by hive. To get the HDFS Path of all the Hive tables: Connect to the external DB that serves as Hive Metastore DB (connected to the Hive Metastore Service). Get filecount, total size, average filesize for Hive tables. By default, we can check the size of a table or database by using the hdfs command as below. Other methods to identify table size is to use DESCRIBE EXTENDED output. Here to write some short and useful posts to share my learning. 324 and 972 are the sizes of one and three replicas of the table data in HDFS. How to Escape from Tutorial Hell As a Developer? How to show hive table size in GB ? 1. This … Perform the select below to know the size all tables in a specific schema: db2 "select substr(a.tabname,1,30), (a.fpages*PAGESIZE/1024) as size_k, a.card from syscat.tables a, \ Setting up your own High Availability managed WordPress hosting using Amazon RDS. Statistics such as the number of rows of a table or partition and the histograms of a particular interesting column are important in many ways. As can seen in the official documentation, the INFORMATION_SCHEMA.TABLES table contains around 20 columns, but for the purpose of determining the amount of disk space used by tables, we’ll focus on two columns in particular: DATA_LENGTH and INDEX_LENGTH. source3 -- chunk size=64k(Minimum). The only difference is the chunk size of the 3 hive tables. DATA_LENGTH is the length (or size) of all data in the table (in bytes). hdfs dfs -df -s -h . This command will return the size of the file /apps/cnn_bnk/customer1_txn.txt with units such as KB,MB or GB.Here the size of given HDFS file is 133KB and it is shown below. In Hive 0.14.0 and later the default is 256 MB, that is, if the input size is 1 GB then 4 reducers will be used. freespace / 1GB)}} Mr. Duff has of course an excellent answer This is the same answer as Mr. Duff suggested, just written a little different. current = ''. This command should also help you get the size of HIVE table : ANALYZE TABLE tablename [PARTITION(partcol1[=val1], partcol2[=val2], ...)] COMPUTE STATISTICS [noscan]; Raw. Azure Databricks selects a running cluster to which you have access. Imagine here we have prepared 3 hive tables with the same size -- 644MB and only 1 file for each table. For a non-partitioned table, you can issue the command: ANALYZE TABLE Table1 COMPUTE STATISTICS FOR COLUMNS; to gather column statistics of the table (Hive 0.10.0 and later). Selecting a random table in Hive with id 5783 and name — test12345 from the TBLS table in Hive Metastore DB. When I asked hive to sample 10%, I actually asked to read approximately 10% blocks but I just have two blocks for my data into this table and minimum hive can read is one block. If it’s a file, you’ll get the length of the file. Statistics serve as the input to the cost functions of the optimizer so that it can compare different plans and choose among them. 30376289388684 x 3 is the actual size in HDFS including the replication. Converts this into readable format (kb, mb, gb) Find the Size of a Table. Find Size Of Tables Using SSMS Standard Report. Size per reducer. Once done, you can execute the below query to get the total size of all the tables in Hive in bytes. "PARTITIONS" stores the information of Hive table partitions. for example, find the path for table r_scan1, => Location:           maprfs:/hive/username.db/r_scan1, Then you know the default path is “maprfs:/hive/username.db/”, $ hadoop fs -du /hive/username.db/ | awk ’/^[0-9]+/ { print int($1/(1024**3)) “ [GB]\t” $2 }’, 0 [GB] /hive/username.db/cst_fl_ga_tn_return_info0 [GB] /hive/username.db/cyberfendrequest0 [GB] /hive/username.db/cyberfendres11 [GB] /hive/username.db/cyberfendresolution. Right click the database. file_count = 0. total_size = 0. output = File.open('output.csv','w') Click in the sidebar. Click the at the top of the Databases folder. MariaDB [hive1]> SELECT SUM(PARAM_VALUE) FROM TABLE_PARAMS WHERE PARAM_KEY="totalSize"; MariaDB [hive1]> SELECT * FROM TBLS WHERE TBL_ID=5783; MariaDB [hive1]> SELECT * FROM TABLE_PARAMS, Computing global rank of a row in a DataFrame with Spark SQL, Caching Spark DataFrame — How & When, Deep dive into Apache Spark Window Functions. Yes, granularity of block sampling is at block level. Generally Hive supports 4 types of complex data types ARRAY MAP STRUCT UNIONTYPE hive array data type example Hive Array behavior is same as Java Array.It is an ordered collection of elements.The all elements in the array is must be same data type. And for non-partitioned tables, “tblproperties” will give the size: To get all the properties: show tblproperties yourTableName. To modify the parameter, navigate to the Hive Configs tab and find the Data per Reducer parameter on the Settings page. hive1 by default. 1. pg_size_pretty: Other functions return results in bytes. … c. hdfs du -s output of the same table from HDFS. 1. 2. 1. sudo -u hdfs hadoop fs -du /user/hive/warehouse/ | awk '/^ [0-9]+/ { print int ($1/ (1024**3)) " [GB]\t" $2 }'. You can change the cluster from the Databases menu, create table UI, or view table UI. Query to get the Table size: SELECT DATABASENAME, TABLENAME, SUM (CURRENTPERM)/1024**2 AS CURRENT_MB, SUM (CURRENTPERM)/1024**3 AS CURRENT_GB FROM DBC.ALLSPACE WHERE DATABASENAME = 'DATABASE_NAME' AND TABLENAME = 'TABLE_NAME' GROUP BY 1,2 ORDER BY 1,2.