How To Fix TPDA491 - Watchpoint on table: Potential performance loss (see long text)

SAP Error Message - Details

• Message type: E = Error

• Message class: TPDA - Debugger

• Message number: 491

• Message text: Watchpoint on table: Potential performance loss (see long text)

What causes this issue?

Setting a watchpoint on an internal table may cause a severe
deterioration in performance regarding the runtime of the program.
Using the empirical formular:
,,f = 5 + R/10 + B/10000
where
,,f: Factor by which the program slows down
,,R: Number of rows in the internal table
,,B: Size of the internal table in bytes
you can estimate how much slower the program will run.
For example, if you have an internal table with 1000 characters and 1000
bytes per row, executing the program slows down by a factor of 205.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

In many cases it is therefore advisable to only activate watchpoints for
internal tables for short program sections.
Tip:
In cases where you are only interested in the change in number of rows
of the internal table, you can alternatively proceed as follows:
Set a watchpoint on the header of the internal table, such as "*ITAB[]",
possibly with the condition:
Not equal to the current row number, such as: "LINES( ITAB ) <> 1000"

Error message extract from SAP system. Copyright SAP SE.