Advanced developer day 3

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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 conditions
Change to
SELECT column_names
FROM table_joins
WHERE conditions
SELECT TOP @maxrows column_names
FROM table_joins
WHERE conditions
Change to
SELECT column_names
FROM table_joins
WHERE conditions
SELECT column_names
FROM table_joins
WHERE conditions
LIMIT maxrows
Change to

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SELECT column_names
FROM table_joins
WHERE conditions
ORDER BY order_by_list
SELECT Count(1)
FROM Simplified_table_joins
WHERE conditions
Adapt 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

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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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Screen preparation is faster because data preparation is made in each webblock.
Use caching mechanisms when repeating the same action/query on different webblocks

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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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