Example: Merging into a Table with an Explicit Isolated Load Operation - Advanced SQL Engine - Teradata Database

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 are the table definitions for the example.

CREATE TABLE ldi_table1,
     WITH CONCURRENT ISOLATED LOADING FOR ALL
     (a INTEGER,
      b INTEGER,
      c INTEGER)
PRIMARY INDEX ( a );


CREATE TABLE t1
     (c1 INTEGER,
      c2 INTEGER,
      c3 INTEGER)
PRIMARY INDEX ( c1 );

 BEGIN ISOLATED LOADING ON ldi_table1 
    USING QUERY_BAND 'LDILoadGroup=Load1;';

SET QUERY_BAND='LDILoadGroup=Load1;' FOR SESSION;

 MERGE INTO ldi_table1
    USING t1 ON a=c1
    WHEN NOT MATCHED THEN INSERT
    VALUES (c1, c2, c3);

END ISOLATED LOADING FOR QUERY_BAND 'LDILoadGroup=Load1;';

SET QUERY_BAND = 'LDILoadGroup=NONE;' FOR SESSION;