DataSize - Teradata Vantage NewSQL Engine - 16.20

Teradata Vantageā„¢ XML Data Type

prodname
Teradata Database
Teradata Vantage NewSQL Engine
vrm_release
16.20
category
Programming Reference
featnum
B035-1140-162K

Purpose

Returns the data length in bytes of any of the following Teradata variable maximum length complex data types:
  • DATASET
  • JSON
  • ST_Geometry
  • XML

Syntax



var_max_length_cdt
A DATASET, JSON, ST_Geometry, or XML data type object.

Return Value

Returns a BIGINT that is the size in bytes of the data object passed in to the function.

Examples: DataSize

The following examples use JSON data types.

SELECT TD_SYSFNLIB.DataSize (NEW JSON ('{"name" : "Mitzy", "age" : 3}'));

datasize( NEW JSON('{"name" : "Mitzy", "age" : 3}', LATIN))
-----------------------------------------------------------
                                                         29
CREATE TABLE JSON_table (id INTEGER, jsn JSON INLINE LENGTH 1000);

INSERT INTO JSON_table VALUES (100, '{"name" : "Mitzy", "age" : 3}');
INSERT INTO JSON_table VALUES (200, '{"name" : "Rover", "age" : 5}');
INSERT INTO JSON_table VALUES (300, '{"name" : "Princess", "age" : 4.5}');

SELECT * FROM JSON_table ORDER BY id;

         id jsn
----------- ------------------------------------------
        100 {"name" : "Mitzy", "age" : 3}
        200 {"name" : "Rover", "age" : 5}
        300 {"name" : "Princess", "age" : 4.5}


SELECT id, TD_SYSFNLIB.DataSize (jsn) FROM JSON_table ORDER BY id;

         id         datasize(jsn)
-----------  --------------------
        100                    29
        200                    29
        300                    34