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DB2 - Problem description

Problem IC70679 Status: Closed

SERVER OPTIONS NEED TO BE ADDED TO ADJUST COST ESTIMATION FOR FETCHING DATA
FROM REMOTE SERVER IN CERTAIN ENVIRONMENT

product:
DB2 FOR LUW / DB2FORLUW / 950 - DB2
Problem description:
In certain environment, cost for fetching massive rows from 
remote server is over-cost, while execution of a remote 
statement multi-times is under-cost. As a result, IFS chooses a 
NLJN which fetches remote data for multi-times, instead of 
choosing the HSJN which fetches all data of a remote table at 
one time, and the performance could be bad with the NLJN.
Problem Summary:
Problem Description: 
SERVER OPTIONS NEED TO BE ADDED TO ADJUST COST ESTIMATION FOR 
FETCHING DATA FROM REMOTE SERVER IN CERTAIN ENVIRONMENT 
Problem Summary: 
In certain environment, cost for fetching massive rows from 
remote server is over-cost, while execution of a remote 
statement multi-times is under-cost. As a result, IFS chooses a 
NLJN which fetches remote data for multi-times, instead of 
choosing the HSJN which fetches all data of a remote table at 
one time, and the performance could be bad with the NLJN.
Local Fix:
Use plan hints, explicit selectivity, stats views to force the 
HSJN plan.
available fix packs:
DB2 Version 9.5 Fix Pack 7 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 8 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 9 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 10 for Linux, UNIX, and Windows

Solution
Problem is first fixed in Version 9.5 Fixpack 7
Workaround
Use plan hints, explicit selectivity, stats views to force the 
HSJN plan.
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
20.08.2010
11.02.2011
11.02.2011
Problem solved at the following versions (IBM BugInfos)
9.5.FP7
Problem solved according to the fixlist(s) of the following version(s)
9.1.0.7 FixList
9.5.0.7 FixList
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