I'm new to DB2. I want to remove large number of rows in a table
without filling up the transaction log space. To this end we can
repeatedly remove a fixed number of rows followed by commit. In
Sybase, one can write a simple transact SQL using rowcount and while
loop to. I saw several people suggesting similar ways in DB2 to
achieve this. I tried to write a compound SQL but failed to get it
work. Haven't been able to get the syntax right.
Can anybody please advise how to get it right? Thanks!
BEGIN ATOMIC
DECLARE rows_deleted INT default 1;
WHILE rows_deleted 0 DO
delete from myTable t
where t.prodID in
(select p.prodID from tableB b
where t.vendor = b.vendor
fetch first 1000 rows only);
commit;
get diagnostics rows_deleted = row_count;
END WHILE;
END 5 8385
You cannot commit inside an atomic compound statement (begin atomic).
Try doing the same inside a stored procedure (with "begin" instead of
"begin atomic" ).
something on these lines...
create procedure xx.yyyy ()
language sql
begin
declare delcount integer default 0;
repeat
delete from (
select 1
from <schema>.<table >
fetch first 1000 rows only
);
get diagnostics delcount = row_count;
commit;
until delcount = 0
end repeat;
end;
Hope that helps.
-SA
Thanks a lot! Is it possible to do the same without creating a stored
proc?
On Jul 23, 4:34*pm, db2dude <abhyan...@gmai l.comwrote:
You cannot commit inside an atomic compound statement (begin atomic).
Try doing the same inside a stored procedure (with "begin" instead of
"begin atomic" ).
something on these lines...
create procedure xx.yyyy ()
language sql
begin
* *declare delcount integer default 0;
* *repeat
* *delete from (
* * * * * * *select 1
* * * * * * *from <schema>.<table >
* * * * * * *fetch first 1000 rows only
* *);
* *get diagnostics delcount = row_count;
* *commit;
until delcount = 0
end repeat;
end;
Hope that helps.
-SA
Thanks a lot! Is it possible to do the same without creating a stored
proc?
On Jul 23, 4:34*pm, db2dude <abhyan...@gmai l.comwrote:
You cannot commit inside an atomic compound statement (begin atomic).
Try doing the same inside a stored procedure (with "begin" instead of
"begin atomic" ).
something on these lines...
create procedure xx.yyyy ()
language sql
begin
* *declare delcount integer default 0;
* *repeat
* *delete from (
* * * * * * *select 1
* * * * * * *from <schema>.<table >
* * * * * * *fetch first 1000 rows only
* *);
* *get diagnostics delcount = row_count;
* *commit;
until delcount = 0
end repeat;
end;
Hope that helps.
-SA
On Jul 24, 12:36*pm, "Henry J." <tank209...@yah oo.comwrote:
Thanks a lot! *Is it possible to do the same without creating a stored
proc?
On Jul 23, 4:34*pm, db2dude <abhyan...@gmai l.comwrote:
You cannot commit inside an atomic compound statement (begin atomic).
Try doing the same inside a stored procedure (with "begin" instead of
"begin atomic" ).
something on these lines...
create procedure xx.yyyy ()
language sql
begin
* *declare delcount integer default 0;
* *repeat
* *delete from (
* * * * * * *select 1
* * * * * * *from <schema>.<table >
* * * * * * *fetch first 1000 rows only
* *);
* *get diagnostics delcount = row_count;
* *commit;
until delcount = 0
end repeat;
end;
Hope that helps.
-SA
I dont think that is possible since you would need to issue a 'commit'
statement you will not be able to do that inside a dynamic compound
sql (begin atomic .. end)
- SA
You can drive the loop from the client in any language you wish.
Cheers
Serge
--
Serge Rielau
DB2 Solutions Development
IBM Toronto Lab This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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I'm DB2 newbie. I need to remove large number of rows from a table.
I don't want to fill up the transaction log space. I have the below
SQL that I feed to the db2 command to repeatly remove a fixed set of
rows until there is no more to remove. However db2 complains about
bad syntax. Can anybody advise how I get it right?
Thanks!
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