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Update and delete operations that use an index scan on a column-organized table are not supported by the FETCH operator. Update and delete operations that affect only a single row are supported by using either index-only access or the nested-loop fetch approach.
delete from whre <conditions> and update <table> set .... where <conditions> use index only it affect a single row.
in migration project (from Oracle, SQLServer,...) to DB2 BLU, there is a huge regression of many job that uses alot of update .... where .... , because the update does not use the index.
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