Advanced developer day 3

Advanced Developer Boot Camp 1

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Architecture

Integration

DevelopmentUser Experience

Life-cycle

Developer Adv. Developer





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SELECT column_names

FROM table_joins

WHERE conditions

SELECT column_names

FROM table_joins

WHERE ROWNUM <= @maxrows AND conditionsChange to

SELECT column_names

FROM table_joins

WHERE conditions

SELECT TOP @maxrows column_names

FROM table_joins

WHERE conditionsChange to

SELECT column_names

FROM table_joins

WHERE conditions

SELECT column_names

FROM table_joins

WHERE conditions

LIMIT maxrows

Change to



SELECT column_names

FROM table_joins

WHERE conditions

ORDER BY order_by_list

SELECT Count(1)

FROM Simplified_table_joins

WHERE conditionsAdapt to


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Same conditions evaluated per column, and according to the

result a query is made individually per cell

Solution #1:

Make the decision in the preparation to perform a different specialized query, joining

with the required tables and returning the same Output structure.

Solution #2:

Implement 2 or more specialized screens and make the decision to call the correct

screen, in situations where the conditional content outweighs common content




In this example, GetInConditionsCounters computes two IN conditions that

are injected in query GetCounters to avoid complex sub-queries inside

GetCounters

Although more complex to code, in terms of efficiency it is better to implement

the sub-queries and let the DB Engine optimize the entire query



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http://bit.ly/1aHPdiM





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Screen preparation is faster because data preparation is made in each webblock.

Use caching mechanisms when repeating the same action/query on different webblocks



Compression

rate of 83%

Potential

savings of

100KB per

screen


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Example - Top slow screens

Screens

to check


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Advanced developer day 3

Software