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Top Forums Programming DB2 - Performance Issue using MERGE option Post 303018330 by Perlbaby on Monday 4th of June 2018 05:39:54 AM
Old 06-04-2018
DB2 - Performance Issue using MERGE option

Dear Team,
I am using DB2 v10.5 and trying to load huge data using MERGE option ( 10-12 Million) using below query. Basically it loads data from staging to target . Staging table schemaname.Customer_Staging has 12 Million records . Runs for 25 Mins for just select query. But while doing merge (first time load) , it has to insert all records and below process is getting hanged after running 1.5-2 hrs (With No inserts)


HTML Code:
   MERGE INTO schemaname.Customer_Table A
    USING ( SELECT DISTINCT B.Name , B.CUST_ID, B.ORG_ID from schemaname.Customer_Staging B 
    WHERE (B.Name is not null and length(B.Name)>0) and (B.CUST_ID is not null and length(B.CUST_ID)>0) and (B.ORG_ID is NOT null and length(B.ORG_ID) > 0)) B
     ON B.Name = A.Name and B.CUST_ID=A.CUST_ID and B.ORG_ID=A.ORG_ID and A.Load_dt is null
    WHEN NOT MATCHED THEN INSERT (Name,CUST_ID,Load_dt,ORG_ID)  
    VALUES(B.Name,B.CUST_ID,current timestamp - current timeZone,B.ORG_ID);

DDL columns for both staging and Target is same .
Included Unique index for three columns Name,CUST_ID,ORG_ID using
Code:
ALLOW REVERSE SCANS PAGE SPLIT SYMMETRIC option


Please can someone help how to tweak this query or use best approach.
any help appreciated
Thanks
 

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SELECT 
INTO(7) PostgreSQL 9.2.7 Documentation SELECT INTO(7) NAME
SELECT_INTO - define a new table from the results of a query SYNOPSIS
[ WITH [ RECURSIVE ] with_query [, ...] ] SELECT [ ALL | DISTINCT [ ON ( expression [, ...] ) ] ] * | expression [ [ AS ] output_name ] [, ...] INTO [ TEMPORARY | TEMP | UNLOGGED ] [ TABLE ] new_table [ FROM from_item [, ...] ] [ WHERE condition ] [ GROUP BY expression [, ...] ] [ HAVING condition [, ...] ] [ WINDOW window_name AS ( window_definition ) [, ...] ] [ { UNION | INTERSECT | EXCEPT } [ ALL | DISTINCT ] select ] [ ORDER BY expression [ ASC | DESC | USING operator ] [ NULLS { FIRST | LAST } ] [, ...] ] [ LIMIT { count | ALL } ] [ OFFSET start [ ROW | ROWS ] ] [ FETCH { FIRST | NEXT } [ count ] { ROW | ROWS } ONLY ] [ FOR { UPDATE | SHARE } [ OF table_name [, ...] ] [ NOWAIT ] [...] ] DESCRIPTION
SELECT INTO creates a new table and fills it with data computed by a query. The data is not returned to the client, as it is with a normal SELECT. The new table's columns have the names and data types associated with the output columns of the SELECT. PARAMETERS
TEMPORARY or TEMP If specified, the table is created as a temporary table. Refer to CREATE TABLE (CREATE_TABLE(7)) for details. UNLOGGED If specified, the table is created as an unlogged table. Refer to CREATE TABLE (CREATE_TABLE(7)) for details. new_table The name (optionally schema-qualified) of the table to be created. All other parameters are described in detail under SELECT(7). NOTES
CREATE TABLE AS (CREATE_TABLE_AS(7)) is functionally similar to SELECT INTO. CREATE TABLE AS is the recommended syntax, since this form of SELECT INTO is not available in ECPG or PL/pgSQL, because they interpret the INTO clause differently. Furthermore, CREATE TABLE AS offers a superset of the functionality provided by SELECT INTO. Prior to PostgreSQL 8.1, the table created by SELECT INTO included OIDs by default. In PostgreSQL 8.1, this is not the case -- to include OIDs in the new table, the default_with_oids configuration variable must be enabled. Alternatively, CREATE TABLE AS can be used with the WITH OIDS clause. EXAMPLES
Create a new table films_recent consisting of only recent entries from the table films: SELECT * INTO films_recent FROM films WHERE date_prod >= '2002-01-01'; COMPATIBILITY
The SQL standard uses SELECT INTO to represent selecting values into scalar variables of a host program, rather than creating a new table. This indeed is the usage found in ECPG (see Chapter 33, ECPG - Embedded SQL in C, in the documentation) and PL/pgSQL (see Chapter 39, PL/pgSQL - SQL Procedural Language, in the documentation). The PostgreSQL usage of SELECT INTO to represent table creation is historical. It is best to use CREATE TABLE AS for this purpose in new code. SEE ALSO
CREATE TABLE AS (CREATE_TABLE_AS(7)) PostgreSQL 9.2.7 2014-02-17 SELECT INTO(7)
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