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Answer Posted / amith
Performance tuning is a technique used to fine tune your
ABAP programs when they have complex select statements and
huge set of data to be accessed from database.
Performacne of a scelect statement or a program can be
tested using tools like SE 30- Runtime analysis and SQL
Trace ST05.
Other than this there are set of thumb rules that can be
followed:
1) Keep the data selection small.
 Avoid unnecessary data across the network
 Always use the where clause
 Avoid selecting useless data we filter later.
 Use the index of the relevant database tables to
make the where clause more efficient
 Avoid using complex where clauses
 If possible avoid using the NOT in conjunction with
the where clause.
2) Transport as little data as possible
• transport only fields that are really used
• use the aggregate functions in the select clause
for calculations
• Consider using the distinct statement if there is
possibility of duplicate entries
3) Use fewer data base access
• Transfer all of the data at once frm data base to
internal tables.
• When possible avoid accessing the same data again
and again
• Avoid using nested loops instead of that use an
internal table and use the select for all entires statement.
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