Trace deletes for a special table

Question

Hello Everybody
We have some strange problems with our Maxdb database (7.6.00.34) (no SAP System)
Every day we lose about 3000-4000 records in an table with 120000 records.
The table is filled with records from a sap system and all programmers are sure that their applications only read or update this table (never delete) ??????
Now i want to trace the database.
Is it possible to write a trace task, that only logs "deletes" on table xyz ??
If yes, how to do this ?
I have never used tracing before, so an example would be very helpfull.
Any help welcomed
Best Regards
Albert

Answer 1

Hi Albert,
the function user will return the current user.
Anyhow, it might be easier to just specify the default value for the username column as user.
Something like this:
create table DELLOG (
"TIMESTAMP" TIMESTAMP NOT NULL default TIMESTAMP,
"TABLEKEY" CHAR (50) NOT NULL,
"USERNAME" CHAR (32) NOT NULL default USER,
primary key ("TIMESTAMP", "TABLEKEY")
That way all you've to figure out yourself for the INSERT is the KEY of the deleted row.
For example if I've got a CUSTOMER table with ID as primary key the trigger could look like this:
create trigger logdelete for lars.customer after delete
execute (
   insert into lars.dellog values (default, :old.id, default);
TIMESTAMP and USERNAME will automaticall be filled by the database.
KR Lars