Get row count from all tables in hive

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How can I get row count from all tables using hive. I am interested in database name, table name and row count

You will need to do a

select count(*) from table

for all tables.

To automate this, you can make a small bash script and some bash commands. First run

$hive -e 'show tables' | tee tables.txt

This stores all tables in the database in a text file tables.txt

Create a bash file (count_tables.sh) with the following contents.

while read line
do
 echo "$line "
 eval "hive -e 'select count(*) from $line'"
done

Now run the following commands.

$chmod +x count_tables.sh
$./count_tables.sh < tables.txt > counts.txt

This creates a text file(counts.txt) with the counts of all the tables in the database

Get row count from all tables in hive, I have a query(ex: below) for which I want to get the statistics like how many rows it results, what Hive - Get number of rows, total size resulted in a query Detailed Table Information | Table(tableName:tableex5, is given in the analyze statement, statistics for all partitions are computed. Select count(*). Get Row Count of All Tables using DMV sys.dm_db_partition_stats. DMV sys.dm_db_partition_stats returns page and row-count information for every partition in the current database. We will leverage this DMV to get row count details of all tables. Run below script to get the row count of all tables using this DMV.

A much faster way to get approximate count of all rows in a table is to run explain on the table. 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.

Hive - Get number of rows, total size resulted in , I may not know if table is exist or not. Solved! Go to Solution. Labels: All versions​  to gather column statistics of the table (Hive 0.10.0 and later). If Table1 is a partitioned table, then for basic statistics you have to specify partition specifications like above in the analyze statement.

select count(*) from table

I think there is no more efficient way.

Solved: [resolved] How to Get Row count from Hive Table, How can I get row count from all tables using hive. I am interested in database name, table name and row count. You will need to do a select count(*) from table​  How to get the row number for particular values from hive table: For example i have column name with VAX_NUM and one of the values for this column is 0006756423. I want know the row number for this value. Do the needful. Thanks

You can also set the database in the same command and separate with ;.

hive -e 'use myDatabase;show tables'

Get row count from all tables in hive - hql, And for non-partitioned tables, “tblproperties” will give the size: To get all the properties: show tblproperties yourTableName. To show just the  As there are no 'systems' tables available in HIVE, is there any way to re-code this to get row counts for ALL tables ? i have 416 tables in my database. SELECT T. name AS [TABLE NAME], I. rows AS [ROWCOUNT] ORDER BY I. rows DESC

try this guys to automate-- put in shell after that run bash filename.sh

hive -e 'select count(distinct fieldid) from table1 where extracttimestamp<'2018-04-26'' > sample.out

hive -e 'select count(distinct fieldid) from table2 where day='26'' > sample.out

lc=cat sample.out | uniq | wc -l if [ $lc -eq 1 ]; then echo "PASS" else echo "FAIL" fi

Hive query to quickly find table size (number of rows), To get the number of rows in a single table we usually use SELECT COUNT(*) or SELECT COUNT_BIG(*). This is quite straightforward for a single table, but  select row_number (), * from emp; I am using hive 0.13. I can't access external jars or udfs in my environment. The underlying files are in parquet format. Thanks in advance! improve this question. edited May 27 '16 at 8:12. 49 silver badges. 77 bronze badges. asked May 27 '16 at 7:07. 3 silver badges. 9 bronze badges.

Listing all tables in a database and their row counts and sizes , Use this handy cheat sheet (based on this original MySQL cheat sheet) to get going with Hive and Hadoop. Additional Resources All values. SELECT * FROM table;. SELECT * FROM table;. Some values. SELECT Counting rows. SELECT  At the end of the SHOW COLUMNS command, it shows the number of rows returned, which indicates the number of columns, so this answer is correct. – J Maurer Oct 15 '15 at 18:36 Even 'Describe db_name.table_name;' will give the count in similar way.

[PDF] SQL to Hive Cheat Sheet, val sourceDB = dbutils.widgets.get("databaseName"). // COMMAND ----------. import org.apache.spark.sql.functions.udf. val countUDF = udf((db: String, tbl:  sp_MSforeachtable is an undocumented system stored procedure which can be used to iterate through each of the tables in a database. In this approach we will get the row counts from each of the tables in a given database in an iterative fashion and display the record counts for all the tables at once.

Hive Row Counts for all tables in a database using databricks spark , Is it more efficient to read parquet files or use a partitioned hive table for a large data set? 950 Views get all tables 2. show create table tableName --get the tableName's DDL How do I select distinct rows from hive table? 61,206 Views. In my db i have many tables that start with 'bza' in table name. I wrote all those table names into a text file name as tables.txt. Now using a shell script (count_row.sh) I am reading each line from tables.txt and execuing the hive commnad:

Comments
  • Check this link hope it helps!!
  • when I run this after an INSERT INTO TABLE table SELECT row FROM another_table I get only the number of rows added and not the total number of rows in table, do you how I can always get the total number of rows?
  • @Mukul the output is +-----Table-----+.... with lines starting and ending with | . Any way to grab just the table name?
  • what is "run explain on the table" is that explain table db.table;? Because that's not valid.
  • How can this be automated for all tables in a database. I am actually interested in a feature similar to information_schema.tables like feature in hive which would enlist record count in all tables in a database using HQL. Any thoughts
  • Any such feature in derby. What is the database name of the metastore by default?
  • Derby or MySQL just store meta info of table, that is the schema. In hive, schema of table just define a way to process data in hdfs. When you load data in hive, hive just put file in hdfs and update hdfs location in metastore. There is no counter in metastore.
  • This helps. Thank you. What can be done when such an audit feature is required to understand how many rows were loaded in all tables across databases. I would not like to issue several count * and would like to keep that as the last option.
  • when I run this after an INSERT INTO TABLE table SELECT row FROM another_table I get only the number of rows added and not the total number of rows in table, do you how I can always get the total number of rows?
  • By the way, I assume that this is an answer starting off with a rethoric question. If you are asking this, please turn it instead into a separate question.
  • depends on select count(*) from table