APAR status
Closed as new function.
Error description
SybaseOC stage unnecessarily puts KEY columns in SET Clause of an UPDATE statement causing performance degradation. This is because of some unnecessary steps involved in processing the query with no extra advantage.
Local fix
Use generated SQL query and modify it by removing KEY columns in SET clause of UPDATE statement and using the query as user-defined SQL.
Problem summary
SybaseOC stage unnecessarily puts KEY columns in SET Clause of an UPDATE statement causing performance degradation. This is because of some unnecessary steps involved in processing the query with no extra advantage.
Problem conclusion
Corrected SybaseOC stage behaviour at both server and GUI level to reflect a query in which only NON KEY columns appear in SET clause of an UPDATE statement. However this is applicable only in generated SQLs not in user defined SQLs. And this behaviour is adopted for performance reasons in execution at database side. Users who wish to see the old behaviour i.e. generating UPDATE statement which contains all columns instead of only KEY columns in SET clause must set the environment variable SYBASEOC_DONT_SKIPKEYCOLS_IN_UPDATE to 1 and rerun their jobs. However the GUI still shows the query which has ONLY KEY columns in the UPDATE statement.
Temporary fix
Use generated SQL query and modify it by removing KEY columns in SET clause of UPDATE statement and using the query as user-defined SQL.
Comments
APAR Information
APAR number
JR37705
Reported component name
WIS DATASTAGE
Reported component ID
5724Q36DS
Reported release
810
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2010-09-07
Closed date
2011-05-30
Last modified date
2011-05-30
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
WIS DATASTAGE
Fixed component ID
5724Q36DS
Applicable component levels
R810 PSY
UP
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Document Information
Modified date:
30 May 2011