Answer / 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.

Answer / hariabap

we can analyze performance of any program by using t.code
se30( runtime analysis). there we can see performance of
database server , application server and processor . If
database is taken more time , try to modify select staments.
Hence performance of program can be improved.

Answer / mohamed

Performance tuning is something related to incresing the
performance of the program ie not giving the full load to
the application server.
this can be done in following methods,
1. using corresponding buffering.
2. not using SELECT *
3. maximum usage of WHERE condition
4. using VIEWs
5. mentioning exactly 'occurs n'
and so on

Answer / abapchaitanya

performance tuning is used to see the status of object
means make that object portable and effcience, and replace
with new suitable statements, method for the performance
tuning is sql tracer,....

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