Sql Trace

[Former Member]

Hi all,

I am trying to analyze the performance the of sql statement in se38 program. I placed the breakpoint at the select statement. then in another session I activated the trace in st05. After the select statementis executed I deactivated the trace and clicked on analyze trace. I can see list of statements but I do not understand how to find out the runtime of this statement and how expensive it is.

I know how to do it with se30 and tips and tricks. I just wan to know how to do with st05.

I am forwarding the code too.

REPORT ZSELECTDEMO.

tables sflight.

data : itab like sflight occurs 0 with header line.

select * from sflight .

itab-carrid = sflight-carrid.

itab-connid = sflight-connid.

itab-fldate = sflight-fldate.

append itab.

clear itab.

endselect.

loop at itab.

write 😕 itab-carrid,itab-connid,itab-fldate.

endloop.

Please help with this.

Regards,

Varun.

[manuel_bassani]

Hi varun,

in the list of statements, position the cursor on a SELECT statement (those are native SQL statement!) and click the button Explain. you will see the extimated cost of the statement and the extimated rows extracted.

I think ST05 is very useful if you want yo check which index is used for a given sql statement.

Try to run transaction ST03N. There are runtime and DB statistics for every sql statements

Regards, Manuel

[Former Member]

Hi Manuel,

I did the same way you have explained me, I got the result as estimated cost = 1, Estimated # Rows = 81. But what information can I infer from this ? How do I know wether this select statement is epensive or not ?

Regards,

Varun.

[manuel_bassani]

Hi,

Those values are estimated from the SQL optimizer (based on DB statistics).

The real execution time is the field "Duration" in the main list.

Regards, Manuel