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For our webapps we use sql statements to retrieve data from our iSeries. I used to use the * to retrieve all fields for a record. Thinking this over, I realized that I regularly need only half of the fields in the database. Because our records has mostly between 20 and 50 fields, this could be a huge datatraffic overhead. Therefore I tested retrieval of data using SQL as follows: SQL1= 'select * from dbfile where field1=string' SQL2= 'select field1, field10, field 17 from dbfile where field1=string' surprisingly SQL2 is running slower than SQL1! I think this has something to do with the creation of a new temporary table with only 3 fields by the SQL-engine, no?
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