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Performance Tuning - Using Selection Criteria


Performance Tuning - Using Selection Criteria

Instead of selecting all the data and doing the processing during the selection, it is advisable to restrict the data to the selection criteria itself, rather than filtering it out using the ABAP code.




Not recommended

Select * from zflight.

Check : zflight-airln = ‘LF’ and zflight-fligh = ‘BW222’.

Endselect.

Recommended

Select * from zflight where airln = ‘LF’ and fligh = ‘222’.

Endselect.

One more point to be noted here is of the select *. Often this is a lazy coding practice. When a programmer gives select * even if one or two fields are to be selected, this can significantly slow the program and put unnecessary load on the entire system. When the application server sends this request to the database server, and the database server has to pass on the entire structure for each row back to the application server. This consumes both CPU and networking resources, especially for large structures.

Thus it is advisable to select only those fields that are needed, so that the database server passes only a small amount of data back.

Also it is advisable to avoid selecting the data fields into local variables as this also puts unnecessary load on the server. Instead attempt must be made to select the fields into an internal table.

A D V E R T I S E M E N T

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