Efficient Software Development with DB2 for OS/390: by Jürgen Glag (auth.), Stephen Fedtke (eds.)

By Jürgen Glag (auth.), Stephen Fedtke (eds.)

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5 Architecture Considerations Regarding the Application Architecture As already mentioned in the previous section, the introduction of certain standards regarding data accesses is to be advocated from the performance point of view. In addition to the measures for avoiding data accesses discussed previously, there are also other areas in which standardization not only has positive effects on the quality of the application but on their performance, too. Implementing central functionalities as services To have any chance at all of being able to optimize central functionalities with a tenable effort, these functionalities must be strictly separated from the actual application functions.

This also results in certain productivity advantages. Owing to the possibility of re-using such a module - this does not only apply within an application system, but, in central systems such as contract management or partner management systems, even across systems - an overall application also becomes much better structured and hence also easier to expand and to maintain. A special regulation has to be set for Sal joins between tables. The option here is to assign the join, according to business criteria, to such a data access module.

Tablel has 3 million rows of 300 bytes each, thus 13 rows per data page. , 20 rows per page; and Table3 consists of 15 million rows of 100 bytes each, thus 40 rows per page. In one processing unit, a Single SELECT is issued on Tablel. On Table2 ,one cursor is processed with an average result set of two rows, which are normally located on one page. On Ta- 35 3 Organizational Measures in Software Development ble3, one cursor is processed with an average result set of 5 rows. , 25 milliseconds for retrieving the index leaf page and 25 milliseconds for the table space page.

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