Example: Deleting from a Table with an Explicit Isolated Load Operation - Analytics Database - Teradata Vantage

SQL Data Manipulation Language

Deployment
VantageCloud
VantageCore
Edition
Enterprise
IntelliFlex
VMware
Product
Analytics Database
Teradata Vantage
Release Number
17.20
Published
June 2022
Language
English (United States)
Last Update
2024-04-05
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lifecycle
latest
Product Category
Teradata Vantage™

For information on defining a load isolated table and performing an explicit isolated load operation, see the WITH ISOLATED LOADING option for CREATE TABLE and ALTER TABLE, in addition to Load Isolation Statements in Teradata Vantage™ - SQL Data Definition Language Syntax and Examples, B035-1144.

Following is the table definition for the example.

CREATE TABLE ldi_table1,
     WITH CONCURRENT ISOLATED LOADING FOR ALL
     (a INTEGER,
      b INTEGER,
      c INTEGER)
PRIMARY INDEX ( a );
This statement starts an explicit concurrent load isolated operation on table ldi_table1:
 BEGIN ISOLATED LOADING ON ldi_table1 
    USING QUERY_BAND 'LDILoadGroup=Load1;';
This statement sets the session as an isolated load session:
SET QUERY_BAND='LDILoadGroup=Load1;' FOR SESSION;
This statement performs an explicit concurrent load isolated delete from table ldi_table1:
 DELETE FROM ldi_table1 WHERE a > 10;
This statement ends the explicit concurrent load isolated operation:
END ISOLATED LOADING FOR QUERY_BAND 'LDILoadGroup=Load1;';
You can use this statement to clear the query band for the next load operation in the same session:
SET QUERY_BAND = 'LDILoadGroup=NONE;' FOR SESSION;