HBase - Count & Truncate

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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):
   - Disabling 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 &plus; CELL
0 row(s) in 0.3110 seconds
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