Re: applying transactions

NP, yeah I've used bulk binds and they're great but I wish they offered conditional logic within the forall statement. If I could perform conditional logic or assignment of values to variables within the forall it'd really make my life easier.

In my situation a merge select will perform as well if not better than a bulk bind. At least I think this is the case:)

Thx for the links and help, Dave

On Wed, Jun 11, 2003 at 05:29:42PM -0700, [EMAIL PROTECTED] wrote:
> Sorry, guess I wasn't clear.
>
> Bulk loading is done with PL/SQL, not sql loader.
>
> I should have referred to 'bulk binds'.
>
> Here are some URL's that may help.
>
> http://download-east.oracle.com/docs/cd/B10501_01/appdev.920/a96590/adg10pck.htm#37506
>
> http://download-east.oracle.com/docs/cd/B10501_01/appdev.920/a96590/adg10pck.htm#20419
>
> http://download-east.oracle.com/docs/cd/B10501_01/appdev.920/a96624/05_colls.htm#28332
>
> Jared
>
>
>
>
>
>
> David Turner <[EMAIL PROTECTED]>
> 06/11/2003 05:02 PM
>
>
> To: [EMAIL PROTECTED]
> cc: [EMAIL PROTECTED]
> Subject: Re: applying transactions
>
>
> Thx Jared,
>
> But I don't see how I could use loader to perform a delete. Sad to say but
> this
> isn't the typical load that I'm used to.. The load files contain inserts
> and
> deletes. I could set up a temporary table to load into which has a trigger
>
> fire on delete to remove rows from the destination table and on an insert
> inserts
> the row into the destination. But, I would think this would be about as
> slow because
> the trigger would have to find each record for deleting.
>
> I also needed to add that each insert and delete was an entire record with
> a flag
> showing the transaction type (I= insert O=out/delete).
>
>
> I think I have a cool solution though. Here's an example :
>
> This is the table that contains the transactions
> create table test1(id number(4),trans_no number(4), trans char(1), field
> varchar2(8));
>
> Here are some example transactions:
>
> insert into test1 values(1,101,'I','A');
> insert into test1 values(2,102,'I','A');
> insert into test1 values(3,103,'I','A');
> insert into test1 values(4,104,'I','A');
> insert into test1 values(5,105,'I','A');
>
> insert into test1 values(1,106,'0','X');
> insert into test1 values(2,107,'O','X');
> insert into test1 values(3,108,'0','X');
> insert into test1 values(4,109,'I','B');
> insert into test1 values(5,110,'I','B');
>
> insert into test1 values(5,115,'0','X');
> insert into test1 values(4,114,'I','C');
> insert into test1 values(3,113,'I','C');
> insert into test1 values(2,112,'I','C');
> insert into test1 values(1,111,'I','C');
>
> Here is the select to get the last change performed on a row
>
> select a.id,a.trans_no, a.trans, a.field
> from
> test1 a,
> (select id,max(trans_no) trans_no from test1 group by id) b
> where
> a.trans_no=b.trans_no;
>
>
> Here would be the result:
>
> ID LINE_NO T FIELD
> ---------- ---------- - --------
> 1 111 I C
> 2 112 I C
> 3 113 I C
> 4 114 I C
> 5 115 0 X
>
>
> I then merge this result set with the destination table. I haven't found
> any
> problems yet and I'm fairly certain I'll hit around 900 trans per sec.
>
> Thanks,
> Dave
>
> On Wed, Jun 11, 2003 at 04:43:32PM -0700, [EMAIL PROTECTED] wrote:
> > If you're on 8i+ you can use bulk loading. It could save you a
> > lot of time on large loads such as this.
> >
> > Jared
> >
> >
> >
> >
> >
> >
> > David Turner <[EMAIL PROTECTED]>
> > Sent by: [EMAIL PROTECTED]
> > 06/11/2003 04:04 PM
> > Please respond to ORACLE-L
> >
> >
> > To: Multiple recipients of list ORACLE-L
> <[EMAIL PROTECTED]>
> > cc:
> > Subject: applying transactions
> >
> >
> > I've got a project where I get daily log files with inserts and deletes
> to
> > keep a
> > table current. I've set up an external table which contains the logs and
> a
> > stored
> > procedure reads from it and inserts or deletes from the table
> accordingly.
> > Note
> > one insert or delete per iteration. They're not bulked.
> >
> > The problem is it is running way too slowly. I'm running about 300
> > transactions
> > a second and believe the slow time has to do with context switching.
> Merge
> > won't
> > work because it can't handle a record being changed multiple times in
> the
> > transaction log/external table. When I run inserts only I'm inserting
> > about 5000
> > rows a second, but understand the deletes would slow it down
> considerably.
> >
> >
> > Keep in mind all the records have to be executed sequentially because
> > we're just
> > applying a log file.
> >
> > Right now I'm trying to figure out a scheme to perform all the inserts
> > that don't
> > exist in the destination table, then all deletes, and then the remaining
>
> > inserts
> > but thought I should just send an email to see if someone had a better
> way
> > of
> > getting me the transaction rate I need, about 1000 rec/s.
> >
> > Thanks, Dave
> >
> > --
> > Please see the official ORACLE-L FAQ: http://www.orafaq.net
> > --
> > Author: David Turner
> > INET: [EMAIL PROTECTED]
> >
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-- 
Author: David Turner
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