SnowConvert AI - Teradata - FLOAD¶

Translation references to convert Teradata FLOAD files to Python

Teradata FastLoad is a command‑driven utility for quickly loading large amounts of data in an empty table on a Teradata Database.

In order to simulate the FastLoad functionality for Teradata in Snowflake, FastLoad files and commands are transformed to Python code, similar to the transformations performed for BTEQ and MultiLoad scripts. The generated code uses the Snowflake Python project called snowconvert.helpers which contains the required functions to simulate the FastLoad statements in Snowflake.

FastLoad Commands Translation¶

Most of the FastLoad commands are considered not relevant in Snowflake, these commands are commented out. Below is the summary list of FastLoad commands and their transformation status into Snowflake:

Teradata FastLoad Command

Transformation Status

Note

AXSMOD

Commented

​

BEGIN LOADING

Transformed

​The node is commented out since the transformation occurs in the related INSERT statement instead.

CLEAR

Commented

​

DATEFORM

Commented

​

DEFINE

Transformed

​

END LOADING

Transformed

​Commented out since is not necessary for the transformation of the BEGIN LOADING.

ERRLIMIT

Commented

​

HELP

Commented

​

HELP TABLE

Commented

​

INSERT

Transformed

Transformed as part of the BEGIN LOADING.

LOGDATA

Commented

​

LOGMECH

Commented

​

LOGOFF

Commented

​

LOGON

Commented

​

NOTIFY

Commented

​

OS

Commented

​

QUIT

Commented

​

RECORD

Commented

​

RUN

Commented

​

SESSIONS

Commented

​

SET RECORD

Transformed

​

SET SESSION CHARSET

Commented

​

SHOW

Commented

​

SHOW VERSIONS

Commented

​

SLEEP

Commented

​

TENACITY

Commented

​

Default Transformation¶

The default behavior of the ConversionTool for these statements is to comment them out. For example:

Teradata (FastLoad)

 SESSIONS 4;
ERRLIMIT 25;
Copy

Snowflake (Python)

 #*** Generated code is based on the SnowConvert AI Python Helpers version 2.0.6 ***
 
import os
import sys
import snowconvert.helpers
from snowconvert.helpers import Export
from snowconvert.helpers import exec
from snowconvert.helpers import BeginLoading
con = None
def main():
  snowconvert.helpers.configure_log()
  con = snowconvert.helpers.log_on()
  #** SSC-FDM-0027 - REMOVED NEXT STATEMENT, NOT APPLICABLE IN SNOWFLAKE.  **
  #SESSIONS 4
   
  #** SSC-FDM-0027 - REMOVED NEXT STATEMENT, NOT APPLICABLE IN SNOWFLAKE.  **
  #ERRLIMIT 25
   
  snowconvert.helpers.quit_application()

if __name__ == "__main__":
  main()
Copy

Nonetheless, there are some exceptions that must be converted to specific Python statements in order to work as intended in Snowflake.

Embedded SQL¶

FastLoad scripts support Teradata statements inside the same file. The majority of these statements are converted just as if they were inside a BTEQ file, with some exceptions.

Dropping an error table is commented out if inside a FastLoad file.

Teradata (FastLoad)

 DROP TABLE Error1;
DROP TABLE Error2;
Copy

Snowflake (Python)

 #*** Generated code is based on the SnowConvert AI Python Helpers version 2.0.6 ***
 
import os
import sys
import snowconvert.helpers
from snowconvert.helpers import Export
from snowconvert.helpers import exec
from snowconvert.helpers import BeginLoading
con = None
def main():
  snowconvert.helpers.configure_log()
  con = snowconvert.helpers.log_on()
  exec("""
    DROP TABLE Error1
    """)
  exec("""
    DROP TABLE Error2
    """)
  snowconvert.helpers.quit_application()

if __name__ == "__main__":
  main()
Copy

Large Example¶

Given the transformations shown above for a variety of commands, consider the following example.

Teradata (FastLoad)

 SESSIONS 4;
ERRLIMIT 25;
DROP TABLE FastTable;
DROP TABLE Error1;
DROP TABLE Error2;
CREATE TABLE FastTable, NO FALLBACK
   ( ID INTEGER, UFACTOR INTEGER, MISC CHAR(42))
   PRIMARY INDEX(ID);
DEFINE ID (INTEGER), UFACTOR (INTEGER), MISC (CHAR(42))
   FILE=FileName;
SHOW;
BEGIN LOADING FastTable ERRORFILES Error1,Error2
   CHECKPOINT 10000;
INSERT INTO FastTable (ID, UFACTOR, MISC) VALUES
   (:ID, :MISC);
END LOADING;
Copy

Snowflake (Python)

 #*** Generated code is based on the SnowConvert AI Python Helpers version 2.0.6 ***
#** SSC-FDM-0007 - MISSING DEPENDENT OBJECTS "Error1", "Error2" **
 
import os
import sys
import snowconvert.helpers
from snowconvert.helpers import Export
from snowconvert.helpers import exec
from snowconvert.helpers import BeginLoading
con = None
def main():
  snowconvert.helpers.configure_log()
  con = snowconvert.helpers.log_on()
  #** SSC-FDM-0027 - REMOVED NEXT STATEMENT, NOT APPLICABLE IN SNOWFLAKE.  **
  #SESSIONS 4
   
  #** SSC-FDM-0027 - REMOVED NEXT STATEMENT, NOT APPLICABLE IN SNOWFLAKE.  **
  #ERRLIMIT 25
   
  exec("""
    DROP TABLE FastTable
    """)
  exec("""
    CREATE OR REPLACE TABLE FastTable (
      ID INTEGER,
      UFACTOR INTEGER,
      MISC CHAR(42)
    )
    """)
  #** SSC-FDM-0027 - REMOVED NEXT STATEMENT, NOT APPLICABLE IN SNOWFLAKE. TRANSLATED BELOW AS ASSIGNMENT STATEMENTS **
  #DEFINE ID (INTEGER), UFACTOR (INTEGER), MISC (CHAR(42)) FILE = FileName
   
  ssc_define_columns = "ID (INTEGER), UFACTOR (INTEGER), MISC (CHAR(42))"
  #Set file name manually if empty
  ssc_define_file = f"""FileName"""
  #** SSC-FDM-0027 - REMOVED NEXT STATEMENT, NOT APPLICABLE IN SNOWFLAKE.  **
  #SHOW
   
  #** SSC-FDM-0027 - REMOVED NEXT STATEMENT, NOT APPLICABLE IN SNOWFLAKE. TRANSLATED BELOW **
  #BEGIN LOADING FastTable ERRORFILES Error1, Error2 CHECKPOINT 10000
   
  #** SSC-FDM-0027 - REMOVED NEXT STATEMENT, NOT APPLICABLE IN SNOWFLAKE. TRANSLATED BELOW AS PART OF THE BEGIN LOADING TRANSLATION **
  #INSERT INTO FastTable (ID, UFACTOR, MISC) VALUES (:ID, :MISC)
   
  ssc_begin_loading_columns = "(ID, UFACTOR, MISC)"
  ssc_begin_loading_values = [":ID", ":MISC"]
  BeginLoading.import_file_to_table(f"""FastTable""", ssc_define_columns, ssc_define_file, ssc_begin_loading_columns, ssc_begin_loading_values, ",")
  #** SSC-FDM-0027 - REMOVED NEXT STATEMENT, NOT APPLICABLE IN SNOWFLAKE. END LOADING **
  #END LOADING
   
  snowconvert.helpers.quit_application()

if __name__ == "__main__":
  main()
Copy

If you have any additional questions regarding this documentation, you can email us at snowconvert-support@snowflake.com.

Known Issues¶

No issues were found.

BEGIN LOADING¶

The transformation for the command BEGIN LOADING is a multi-part transformation that requires the DEFINE, INSERT and (optionally) SET RECORD commands to simulate its behavior correctly.

This transformation is fully explained in the following subsections.

SET RECORD¶

As stated above, this command is not required for the transformation of the BEGIN LOADING. If not found, the default delimiter will be set to ‘,’ (comma). Else, the defined delimiter will be used. This value is stored in the ssc_set_record variable.

As of now only SET RECORD VARTEXT, SET RECORD FORMATTED and SET RECORD UNFORMATTED are supported. For the BINARY and TEXT keyword specification an error EWI is placed instead.

Teradata (FastLoad)

SET RECORD VARTEXT DELIMITER 'c' DISPLAY ERRORS 'efilename';
SET RECORD VARTEXT 'l' 'c' NOSTOP;
SET RECORD VARTEXT 'l' TRIM NONE LEADING 'p';
SET RECORD VARTEXT 'l' TRIM NONE TRAILING 'p';
SET RECORD VARTEXT 'l' TRIM NONE BOTH 'p';
SET RECORD FORMATTED TRIM NONE BOTH;
SET RECORD UNFORMATTED QUOTE NO OPTIONAL;
SET RECORD BINARY QUOTE NO YES 'q';
SET RECORD TEXT QUOTE OPTIONAL;
Copy

Snowflake (Python)

#*** Generated code is based on the SnowConvert AI Python Helpers version 2.0.6 ***
 
import os
import sys
import snowconvert.helpers
from snowconvert.helpers import Export
from snowconvert.helpers import exec
from snowconvert.helpers import BeginLoading
con = None
def main():
  snowconvert.helpers.configure_log()
  con = snowconvert.helpers.log_on()
  #** SSC-FDM-0027 - REMOVED NEXT STATEMENT, NOT APPLICABLE IN SNOWFLAKE. TRANSLATED BELOW AS AN ASSIGNMENT STATEMENT **
  #SET RECORD VARTEXT DELIMITER 'c' DISPLAY ERRORS 'efilename'
   
  ssc_set_record = ""
  #** SSC-FDM-0027 - REMOVED NEXT STATEMENT, NOT APPLICABLE IN SNOWFLAKE. TRANSLATED BELOW AS AN ASSIGNMENT STATEMENT **
  #SET RECORD VARTEXT 'l' 'c' NOSTOP
   
  ssc_set_record = "'l'"
  #** SSC-FDM-0027 - REMOVED NEXT STATEMENT, NOT APPLICABLE IN SNOWFLAKE. TRANSLATED BELOW AS AN ASSIGNMENT STATEMENT **
  #SET RECORD VARTEXT 'l' TRIM NONE LEADING 'p'
   
  ssc_set_record = "'l'"
  #** SSC-FDM-0027 - REMOVED NEXT STATEMENT, NOT APPLICABLE IN SNOWFLAKE. TRANSLATED BELOW AS AN ASSIGNMENT STATEMENT **
  #SET RECORD VARTEXT 'l' TRIM NONE TRAILING 'p'
   
  ssc_set_record = "'l'"
  #** SSC-FDM-0027 - REMOVED NEXT STATEMENT, NOT APPLICABLE IN SNOWFLAKE. TRANSLATED BELOW AS AN ASSIGNMENT STATEMENT **
  #SET RECORD VARTEXT 'l' TRIM NONE BOTH 'p'
   
  ssc_set_record = "'l'"
  #** SSC-FDM-0027 - REMOVED NEXT STATEMENT, NOT APPLICABLE IN SNOWFLAKE. TRANSLATED BELOW AS AN ASSIGNMENT STATEMENT **
  #SET RECORD FORMATTED TRIM NONE BOTH
   
  ssc_set_record = ","
  #** SSC-FDM-0027 - REMOVED NEXT STATEMENT, NOT APPLICABLE IN SNOWFLAKE. TRANSLATED BELOW AS AN ASSIGNMENT STATEMENT **
  #SET RECORD UNFORMATTED QUOTE NO OPTIONAL
   
  ssc_set_record = "UNFORMATTED"
  #** SSC-EWI-0021 - 'BINARY' KEYWORD SPECIFICATION FOR SET RECORD NOT SUPPORTED IN SNOWFLAKE **
  #SET RECORD BINARY QUOTE NO YES 'q'
   
  #** SSC-EWI-0021 - 'TEXT' KEYWORD SPECIFICATION FOR SET RECORD NOT SUPPORTED IN SNOWFLAKE **
  #SET RECORD TEXT QUOTE OPTIONAL
   
  snowconvert.helpers.quit_application()

if __name__ == "__main__":
  main()
Copy

DEFINE¶

The transformation for the DEFINE command sets the ssc_define_columns and ssc_define_file variables with the value of the columns definition and the file path to be used in the BEGIN LOADING transformation respectively.

Teradata (FastLoad)

DEFINE
    id (INTEGER),
    first_name (VARCHAR(50)),
    last_name (VARCHAR(50)),
    salary (FLOAT)
FILE=/tmp/inputData.txt;

DEFINE
    id (INTEGER),
    first_name (VARCHAR(50)),
    last_name (VARCHAR(50)),
    salary (FLOAT)

DEFINE
FILE=/tmp/inputData.txt;

DEFINE;
Copy

Snowflake (Python)

#*** Generated code is based on the SnowConvert AI Python Helpers version 2.0.6 ***
 
import os
import sys
import snowconvert.helpers
from snowconvert.helpers import Export
from snowconvert.helpers import exec
from snowconvert.helpers import BeginLoading
con = None
def main():
  snowconvert.helpers.configure_log()
  con = snowconvert.helpers.log_on()
  #** SSC-FDM-0027 - REMOVED NEXT STATEMENT, NOT APPLICABLE IN SNOWFLAKE. TRANSLATED BELOW AS ASSIGNMENT STATEMENTS **
  #DEFINE id (INTEGER), first_name (VARCHAR(50)), last_name (VARCHAR(50)), salary (FLOAT) FILE = /tmp/inputData.txt
   
  ssc_define_columns = "id (INTEGER), first_name (VARCHAR(50)), last_name (VARCHAR(50)), salary (FLOAT)"
  #Set file name manually if empty
  ssc_define_file = f"""/tmp/inputData.txt"""
  #** SSC-FDM-0027 - REMOVED NEXT STATEMENT, NOT APPLICABLE IN SNOWFLAKE. TRANSLATED BELOW AS ASSIGNMENT STATEMENTS **
  #DEFINE id (INTEGER), first_name (VARCHAR(50)), last_name (VARCHAR(50)), salary (FLOAT)
   
  ssc_define_columns = "id (INTEGER), first_name (VARCHAR(50)), last_name (VARCHAR(50)), salary (FLOAT)"
  #Set file name manually if empty
  ssc_define_file = f""""""
  #** SSC-FDM-0027 - REMOVED NEXT STATEMENT, NOT APPLICABLE IN SNOWFLAKE. TRANSLATED BELOW AS ASSIGNMENT STATEMENTS **
  #DEFINE FILE = /tmp/inputData.txt
   
  ssc_define_columns = ""
  #Set file name manually if empty
  ssc_define_file = f"""/tmp/inputData.txt"""
  #** SSC-FDM-0027 - REMOVED NEXT STATEMENT, NOT APPLICABLE IN SNOWFLAKE. TRANSLATED BELOW AS ASSIGNMENT STATEMENTS **
  #DEFINE
   
  ssc_define_columns = ""
  #Set file name manually if empty
  ssc_define_file = f""""""
  snowconvert.helpers.quit_application()

if __name__ == "__main__":
  main()
Copy

BEGIN LOADING¶

The BEGIN LOADING command is commented out since the relevant information for the transformation is found in the associated INSERT statement instead.

ERRORFILES, NODROP, CHECKPOINT, INDICATORS and DATAENCRYPTION specifications are not necessary for the transformation and thus commented out.

Teradata (FastLoad)

BEGIN LOADING FastTable ERRORFILES Error1,Error2
   CHECKPOINT 10000;
Copy

Snowflake (Python)

#*** Generated code is based on the SnowConvert AI Python Helpers version 2.0.6 ***
 
import os
import sys
import snowconvert.helpers
from snowconvert.helpers import Export
from snowconvert.helpers import exec
from snowconvert.helpers import BeginLoading
con = None
def main():
  snowconvert.helpers.configure_log()
  con = snowconvert.helpers.log_on()
  #** SSC-FDM-0027 - REMOVED NEXT STATEMENT, NOT APPLICABLE IN SNOWFLAKE. TRANSLATED BELOW **
  #BEGIN LOADING FastTable ERRORFILES Error1, Error2 CHECKPOINT 10000
   
  snowconvert.helpers.quit_application()

if __name__ == "__main__":
  main()
Copy

INSERT¶

The transformation for the associated INSERT statement sets the value for the ssc_begin_loading_columns and ssc_begin_loading_values variables, used to determine the order in which to insert the values to be loaded.

Finally, these variables and the ones described in the above sections are used to call the the BeginLoading.import_file_to_table function part of the SnowConvert.Helpers module. This function simulates the behavior of the whole FastLoad BEGIN LOADING process. To learn more about this function check here.

Teradata (FastLoad)

SET RECORD VARTEXT """";
DEFINE
    _col1 (CHAR(10)),
    _col2 (CHAR(7)),
    _col3 (CHAR(2, NULLIF = 'V5'))
FILE=inputDataNoDel.txt;
BEGIN LOADING TESTS.EmpLoad4
ERRORFILES ${CPRDBName}.ET_${LOADTABLE},${CPRDBName}.UV_${LOADTABLE}
CHECKPOINT 1000;
INSERT INTO TESTS.EmpLoad4 (col2, col3, col1, col4)	
VALUES
(
    :_col2,
    :_col3,
    :_col1,
    CURRENT_DATE
);
Copy

Snowflake (Python)

#*** Generated code is based on the SnowConvert AI Python Helpers version 2.0.6 ***
#** SSC-FDM-0007 - MISSING DEPENDENT OBJECT "TESTS.EmpLoad4" **
 
import os
import sys
import snowconvert.helpers
from snowconvert.helpers import Export
from snowconvert.helpers import exec
from snowconvert.helpers import BeginLoading
con = None
#** SSC-FDM-TD0022 - SHELL VARIABLES FOUND, RUNNING THIS CODE IN A SHELL SCRIPT IS REQUIRED **
def main():
  snowconvert.helpers.configure_log()
  con = snowconvert.helpers.log_on()
  #** SSC-FDM-0027 - REMOVED NEXT STATEMENT, NOT APPLICABLE IN SNOWFLAKE. TRANSLATED BELOW AS AN ASSIGNMENT STATEMENT **
  #SET RECORD VARTEXT "" ""
   
  ssc_set_record = ""
  #** SSC-FDM-0027 - REMOVED NEXT STATEMENT, NOT APPLICABLE IN SNOWFLAKE. TRANSLATED BELOW AS ASSIGNMENT STATEMENTS **
  #DEFINE _col1 (CHAR(10)), _col2 (CHAR(7)), _col3 (CHAR(2, NULLIF = 'V5')) FILE = inputDataNoDel.txt
   
  ssc_define_columns = "_col1 (CHAR(10)), _col2 (CHAR(7)), _col3 (CHAR(2, NULLIF = 'V5'))"
  #Set file name manually if empty
  ssc_define_file = f"""inputDataNoDel.txt"""
  #** SSC-FDM-0027 - REMOVED NEXT STATEMENT, NOT APPLICABLE IN SNOWFLAKE. TRANSLATED BELOW **
  #BEGIN LOADING TESTS.EmpLoad4 ERRORFILES ${CPRDBName}.ET_${LOADTABLE}, ${CPRDBName}.UV_${LOADTABLE} CHECKPOINT 1000
   
  #** SSC-FDM-0027 - REMOVED NEXT STATEMENT, NOT APPLICABLE IN SNOWFLAKE. TRANSLATED BELOW AS PART OF THE BEGIN LOADING TRANSLATION **
  #INSERT INTO TESTS.EmpLoad4 (col2, col3, col1, col4) VALUES (:_col2, :_col3, :_col1, CURRENT_DATE)
   
  ssc_begin_loading_columns = "(col2, col3, col1, col4)"
  ssc_begin_loading_values = [":_col2", ":_col3", ":_col1", "CURRENT_DATE()"]
  BeginLoading.import_file_to_table(f"""TESTS.EmpLoad4""", ssc_define_columns, ssc_define_file, ssc_begin_loading_columns, ssc_begin_loading_values, ssc_set_record)
  snowconvert.helpers.quit_application()

if __name__ == "__main__":
  main()
Copy

Internally, the import_file_to_table function creates a temporary stage and puts the local file in the stage to load into the specified table. However, the file might be already stored in one the supported cloud provider by Snowflake:

StageInput Data Place Holder
StageInput Data Place Holder
Internal stage@my_int_stage
External stage@my_int_stage/path/file.csv
Amazon S3 buckets3://mybucket/data/files
Google Cloud Storagegcs://mybucket/data/files
Microsoft Azureazure://myaccount.blob.core.windows.net/mycontainer/data/files

If this is the case, please manually add the additional parameter input_data_place_holder="<cloud_provider_path>" in the import_file_to_table function. For example:

BeginLoading.import_file_to_table(
  f"""TESTS.EmpLoad4""", 
  ssc_define_columns, 
  ssc_define_file, 
  ssc_begin_loading_columns, 
  ssc_begin_loading_values, 
  ssc_set_record,
  input_data_place_holder="s3://mybucket/data/files")
Copy

END LOADING¶

The END LOADING command is commented out since is not necessary for the transformation of the BEGIN LOADING.

Teradata (FastLoad)

END LOADING;
Copy

Snowflake (Python)

#*** Generated code is based on the SnowConvert AI Python Helpers version 2.0.6 ***
 
import os
import sys
import snowconvert.helpers
from snowconvert.helpers import Export
from snowconvert.helpers import exec
from snowconvert.helpers import BeginLoading
con = None
def main():
  snowconvert.helpers.configure_log()
  con = snowconvert.helpers.log_on()
  #** SSC-FDM-0027 - REMOVED NEXT STATEMENT, NOT APPLICABLE IN SNOWFLAKE. END LOADING **
  #END LOADING
   
  snowconvert.helpers.quit_application()

if __name__ == "__main__":
  main()
Copy

Known Issues¶

1. BINARY and TEXT keyword specification not supported

The BINARY and TEXT keyword specification for the SET RECORD command are not yet supported.

2. Only base specification for VARTEXT is supported

Extra specifications for the SET RECORD VARTEXT such as TRIM or QUOTE are not yet supported.

Related EWIs¶

  1. SSC-FDM-0007: Element with missing dependencies.

  2. SSC-FDM-0027: Removed next statement, not applicable in SnowFlake.

  3. SSC-EWI-0021: Not supported.

  4. SSC-FDM-TD0022: Shell variables found, running this code in a shell script is required.

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