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Top Forums Programming DB2 - Performance Issue using MERGE option Post 303018423 by Perlbaby on Wednesday 6th of June 2018 03:56:53 AM
Old 06-06-2018
Hi Robin
First Thing : Thank you for looking into it and providing valid suggestions.

Made few changes :
1.I have removed distinct in the select query.
2.I already have indexes for both tables for required columns as below.

Code:
--staging 
CREATE UNIQUE INDEX schemaname.PK_Customer_Staging
    ON schemaname.Customer_Staging(Name ,CUST_ID,ORG_ID)
ALLOW REVERSE SCANS PAGE SPLIT SYMMETRIC

--target
CREATE UNIQUE INDEX schemaname.PK_Customer_Table
    ON schemaname.Customer_Table(Name ,CUST_ID,ORG_ID)
ALLOW REVERSE SCANS PAGE SPLIT SYMMETRIC

3.I observed my db2 uses MAX_LOG => 32 and LOGPRIMARY is 12(No way to extend this as its max provided by tool client ) and do get transaction log space error while loading first time since no data exists in target table.

Is there any way to split the logic based on row count and insert data in two parts . Like First 5 Million , then 5=M to Max count .
Or any other approach to load huge 8 Million data . Any help appreciated.
 

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CREATE 
TABLESPACE(7) PostgreSQL 9.2.7 Documentation CREATE TABLESPACE(7) NAME
CREATE_TABLESPACE - define a new tablespace SYNOPSIS
CREATE TABLESPACE tablespace_name [ OWNER user_name ] LOCATION 'directory' DESCRIPTION
CREATE TABLESPACE registers a new cluster-wide tablespace. The tablespace name must be distinct from the name of any existing tablespace in the database cluster. A tablespace allows superusers to define an alternative location on the file system where the data files containing database objects (such as tables and indexes) can reside. A user with appropriate privileges can pass tablespace_name to CREATE DATABASE, CREATE TABLE, CREATE INDEX or ADD CONSTRAINT to have the data files for these objects stored within the specified tablespace. PARAMETERS
tablespace_name The name of a tablespace to be created. The name cannot begin with pg_, as such names are reserved for system tablespaces. user_name The name of the user who will own the tablespace. If omitted, defaults to the user executing the command. Only superusers can create tablespaces, but they can assign ownership of tablespaces to non-superusers. directory The directory that will be used for the tablespace. The directory should be empty and must be owned by the PostgreSQL system user. The directory must be specified by an absolute path name. NOTES
Tablespaces are only supported on systems that support symbolic links. CREATE TABLESPACE cannot be executed inside a transaction block. EXAMPLES
Create a tablespace dbspace at /data/dbs: CREATE TABLESPACE dbspace LOCATION '/data/dbs'; Create a tablespace indexspace at /data/indexes owned by user genevieve: CREATE TABLESPACE indexspace OWNER genevieve LOCATION '/data/indexes'; COMPATIBILITY
CREATE TABLESPACE is a PostgreSQL extension. SEE ALSO
CREATE DATABASE (CREATE_DATABASE(7)), CREATE TABLE (CREATE_TABLE(7)), CREATE INDEX (CREATE_INDEX(7)), DROP TABLESPACE (DROP_TABLESPACE(7)), ALTER TABLESPACE (ALTER_TABLESPACE(7)) PostgreSQL 9.2.7 2014-02-17 CREATE TABLESPACE(7)
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