HBase - Count & Truncate

count

You can count the number of rows of a table using the count command. Its syntax is as follows:

count ‘<table name>’ 

After deleting the first row, emp table will have two rows. Verify it as shown below.

hbase(main):023:0> count  emp 
2 row(s) in 0.090 seconds
⇒ 2 

truncate

This command disables drops and recreates a table. The syntax of truncate is as follows:

hbase> truncate  table name 

Example

Given below is the example of truncate command. Here we have truncated the emp table.

hbase(main):011:0> truncate  emp 
Truncating  one  table (it may take a while):
   - Disabpng table...
   - Truncating table...
   0 row(s) in 1.5950 seconds

After truncating the table, use the scan command to verify. You will get a table with zero rows.

hbase(main):017:0> scan ‘emp’
ROW                  COLUMN + CELL
0 row(s) in 0.3110 seconds