get row count from all tables in hive

Thank you for the technique using "COALESCE". 11:37 PM. sp_MSforeachtable is an undocumented system stored procedure which can be used interested in. SInce my Object Explorer has many databases, how do i use any of these techniques in a SQL Managment Stidio query? System Functions (Transact-SQL) sys.dm_db_partition_stats Dynamic Management View (DMV), sp_MSforeachtable System Stored Procedure. When working with data in S3, ADLS, or WASB, the steps for analyzing tables are the same as when working with data in HDFS. As Hive do not have a direct way to get row count of all tables, here is the Spark alternative. SELECT SCHEMA_NAME(t.schema_id) AS schema_name, t.name AS table_name,i.rowsFROM sys.tables AS t INNER JOINsys.sysindexes AS i ON t.object_id = i.id AND i.indid < 2, How to take backup database from sql server, http://www.bigator.com/2013/01/23/mssql-find-total-records-of-each-table-in-given-database/. I found that this and other examples returned records where the column was in a compound index so I wrote this to only show FK columns that were not part of any index. I had trouble with the T-SQL code formating so I included the script as an attachment along with an image of the code below. 09-29-2017 (I tried them all). I am trying to run the following: use ; How to print and connect to printer using flutter desktop via usb? Let's take a look at each of the approaches: sys.partitions is an Object Catalog View and contains one row for each partition I had trouble with the T-SQL code formating so I included the script as an attachment along with an image of the code below. 565), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. or when an object/partition is dropped and recreated. ANALYZE TABLE. But this is for all the databases as well at once. Shell: How to call one shell script from another shell script? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. How to view the value of a hive variable? The differences I seeare storing the results in Temp Table instead of Table Variable, and use of sp_spaceused system stored procedure. The following example executes an UPDATE statement and uses @@ROWCOUNT to detect if any rows were changed. The T-SQL query below uses the sp_MSforeachtable system stored procedure to iterate Without more details in your model, it's little hard to tell you how to use it properly. One way which can work is. query gives me row counts for each partition of a specific table. Do not know how to go ahead? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Can I general this code to draw a regular polyhedron? I Reckon, the below query would do the trick. In this type of scenario, I don't see any much performance impact and Approach# 4 can be used here as well. Natively compiled stored procedures preserve the previous @@ROWCOUNT. SELECT * FROM hive.PARTITION_PARAMS AS A, hive.PARTITIONS AS B WHERE A.PARAM_KEY='numRows' and A.PART_ID=B.PART_ID and A.PART_ID IN ( SELECT PART_ID FROM hive.PARTITIONS WHERE TBL_ID= (SELECT A.TBL_ID FROM hive.TBLS AS A, hive.DBS AS B WHERE A.DB_ID=B.DB_ID AND B.NAME='DATABASE_NAME' AND A.TBL_NAME='TABLE_NAME')) The first query counts all the rows in table t1. The below query simply fetches the record count per table irrespective of volume. on the system. Imagine you have two objects of the same name in two different schema. In one of the explain clauses, it shows row counts like below: TableScan [TS_0] (rows=224910 width=78) The benefit is that you are not actually spending cluster resources to get that information. The HQL command is explain select * from table_name; but when not optimized not shows rows in the TableScan. Collect statistics for existing tables using ANALYZE command. The COMPUTE STATS command collects and sets the table-level and partition-level row counts as well as all column statistics for a given table. In addition, A partitioned By clause is used to split the rows into groups based on column value. SELECT column_A, count(*) as cnt FROM table_name GROUP BY column_A I want to get the top 10 rows in every group. select s.schema_id,s.name schema_name,o.object_id,o.name object_name,c.column_id,c.name column_name, fk.name FK_name, i.name index_name, SUM(p.rows) row_count, GROUP BY s.schema_id,s.name ,o.object_id,o.name ,c.column_id,c.name , fk.name , i.name, select s.schema_id,s.name schema_name,o.object_id,o.name object_name,c.column_id,c.name column_name,i.object_id,i.index_id,i.name index_name, ic.index_column_id, fk.name FK_name, INNER JOIN sys.indexes i on i.object_id = o.object_id, INNER JOIN sys.index_columns ic on o.object_id = ic.object_id and i.index_id = ic.Index_id and c.column_id = ic.column_id, LEFT JOIN sys.foreign_key_columns fkc on fkc.parent_object_id = o.object_id and fkc.parent_column_id = c.column_id, LEFT JOIN sys.foreign_keys fk on fk.object_id = fkc.constraint_object_id, LEFT JOIN sys.key_constraints kc on kc.parent_object_id = o.object_id and i.index_id = kc.unique_index_id, order by s.name,o.name,c.column_id,i.name. Created manipulation done on the database for testing purposes, etc. Incredible Tips That Make Life So Much Easier. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. If you are looking for a quick way to get COUNT(*) for a complete table or some of its partitions, just use EXPLAIN directly before the query. Some numbers, such as the number and total size of data files, are always kept up to date because they can be computed cheaply as part of the HDFS block metadata collection. Please note that "sys.sysindexes" is a compatibility view provided for backward compatibility. sp_MSforeachtable is an undocumented system 04:13 AM, Find answers, ask questions, and share your expertise, Hive query to find Total count of records and count(lastrundate) records. Literature about the category of finitary monads, How to create a virtual ISO file from /dev/sr0. So we have a starting point. The T-SQL query below uses the sys.partitions catalog view to capture the row counts for all tables in a database. As Hive do not provide any way to get row count of all tables in a single statement, people generally have to write some custom script to get the result. 256707-for-each-database.txt. We will sent Hive DB name from the command line argument on Spark submit statement. I am a database tester and one of my tasks involves getting row counts from CALCULATE (SUM(factRoomOccupancy[CountRoomOccWGroup]), ALLSELECTED(factRoomOccupancy[CA_Name])) Here the idea is to get the total for "All" available "CA_Name" values in the context. Connect and share knowledge within a single location that is structured and easy to search. Thanks for contributing an answer to Stack Overflow! individual tables, puts them together and displays the results for all the tables. You can query DMV sys.dm_db_partition_stats (Transact-SQL) to get the row count for each table Open sourced to Apache in 2008. We will sent Hive DB name from the command line argument on Spark submit statement. The user has to explicitly set the boolean variable hive.stats.autogather to falseso that statistics are not automatically computed and stored into Hive metastore. Top 5 reasons to learn python for every IT professional, Travel on Local Trains in India?Make your life Digital with UTS, Get row count from all tables in hive using Spark. How a top-ranked engineering school reimagined CS curriculum (Ep. Download ZIP Hive Row Counts for all tables in a database using databricks spark Raw DatabricksRowCounts.scala // Databricks notebook source dbutils.widgets.text ("databaseName", "foo") // COMMAND ---------- val sourceDB = dbutils.widgets.get ("databaseName") // COMMAND ---------- import org.apache.spark.sql.functions.udf Shell script to pull row counts from all Hive tables in multiple Hive databases. On running SELECT count (column), only the rows that do not have nulls in that column are returned. The collection process is CPU-intensive and can take a long time to complete for very large tables. from all the tables in a database can be really helpful and effective thereby considerably It will assign the unique number (1,2,3) for each row based on the column value that used in the OVER clause. Third, execute the SQL statement using a prepared statement. Is it possible to store the result of your script in a database table? * FROM hive.PARTITION_PARAMS AS A, hive.PARTITIONS AS B WHERE To learn more, see our tips on writing great answers. Output : try row_number() window function like below. Getting the row Alternatively analyze table tbl_name compute statistics; will give you no of files, no of records and its size. GP, that is manually. No MSForeach, or sysindexes. 01:45 PM. Find centralized, trusted content and collaborate around the technologies you use most. Reset @@ROWCOUNT to 0 but do not return the value to the client. Copyright (c) 2006-2023 Edgewood Solutions, LLC All rights reserved Created Hive cost based optimizer makes use of these statistics to create optimal execution plan. Generic Doubly-Linked-Lists C implementation. Why does Acts not mention the deaths of Peter and Paul? You can collect the statistics on the table by using Hive ANALAYZE command. Azure SQL Managed Instance. How to troubleshoot crashes detected by Google Play Store for Flutter app, Cupertino DateTime picker interfering with scroll behaviour. Checking Irreducibility to a Polynomial with Non-constant Degree over Integer. First, to get all table names of a database, you . Has depleted uranium been considered for radiation shielding in crewed spacecraft beyond LEO? Preserve @@ROWCOUNT from the previous statement execution. How do I get the row counts from all the In general, querying the Dynamic Management Views (DMVs), requires VIEW SERVER STATE or VIEW DATABASE STATE permissions based on the Dynamic Management View/Function which is being queried. through each of the tables to capture the row count for all the tables in a database. I don't want to run "select count(*) from

" from the hive prompt. Can you still use Commanders Strike if the only attack available to forego is an attack against an ally? to get the row counts from all the tables in a SQL Server database. This information includes physical characteristics such as number of rows, number of data files, the total size of data files, and file format. But what about tables where its not partitioned ? Heres how to do complex count statements to simplify queries. need to replace DATABASE_NAME and TABLE_NAME with the one you are The first option worked like a charm. testing phase. [schema_id], INNER JOIN sys.partitions p ON p.object_id = o.object_id, INNER JOIN sys.indexes ip ON ip.object_id=o.object_id and p.index_id = ip.index_id and ip.is_primary_key=1, INNER JOIN sys.columns c on c.object_id = o.object_id, INNER JOIN sys.foreign_key_columns fkc on fkc.parent_object_id = o.object_id and fkc.parent_column_id = c.column_id, INNER JOIN sys.foreign_keys fk on fk.object_id = fkc.constraint_object_id, LEFT JOIN sys.index_columns ic on o.object_id = ic.object_id and c.column_id = ic.column_id, LEFT JOIN sys.indexes i on i.index_id = ic.Index_id and i.object_id = ic.object_id, order by s.name,o.name,c.column_id,fk.name'.

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