SELECT bulc collect into takes to long

Question

Hi,
by the following statement I get Data from a Remote Database and do a update on a local table via a sql procedure
This part of the proecure takes about 70 seconds.
select /*+ RULE */ id, messaging_state, recipient, messaging_type, manual, node, mess_arch_id, text, alarm_id, time_start, time_end
bulk collect into marcupids, marcstats, marcrecips, marctypes, marcmans, marcnodes, marcmssarc, marctexts, marcalarms, marctstrts, marctends
from m_testdata@Remote_database marcs
where marcs.in_archive = 1 and exists (select id from m_testdata rm where rm.id = marcs.id);
cnt := sql%rowcount;
if cnt > 0 then
forall i in marcupids.first..marcupids.last
update m_testdata set messaging_state = marcstats(i), time_end = marctends(i) where id = marcupids(i);
But if I do just the select like the following without the "bulc collect into" it takes less then a second.
select /*+ RULE */ id, messaging_state, recipient, messaging_type, manual, node, mess_arch_id, text, alarm_id, time_start, time_end
marctexts, marcalarms, marctstrts, marctends
from m_testdata@Remote_database marcs
where marcs.in_archive = 1 and exists (select id from m_testdata rm where rm.id = marcs.id);
Can somebody tell me the reason why it takes so long when executed by a procedure/Job , Strange is that this problem does not appear on all installation with compareable size of m_testdata on the remote and the local database. On Some installations it runs in less than a second with the "bulc collect into" and in some it takes more than 70 seconds:
Any Idea?
Kind Regards
Andre

Answer 1

Hi,
Have you tried adding the statements in a batch and then executing the batch?
You wouldn't want to add all the records in a batch as it would slow down your client. Instead, experiment to find out what would be the ideal number of records to add in a batch before executing them.
I hope this helps.
Hi, I have an Oracle 8 on a Unix platform which I access with Java 1.3 jdbc code over the network. I write about 9000 records, each record consisting of three fields with respective lengths of 10, 10 and 1. It takes an extremely long time to put these records into the database, for example 20-30 minutes or even more. Is it normal that its taking so long and if not what can I do to speed it? Tx much,
EB