Re: applying transactions

Cool, I'll get one of the perl guys to help me with that. Yeah I wish these were all inserts, my estimates on hardware would have been different if I had realized how costly these files would be.

I really can't see a way of converting the deletes to inserts. But I have been able to convert the deletes to updates. Instead of performing a delete the update flags the record for later deletion. This allows me to use the merge which has gotten me about 3 times faster performance. However, if I could convert them all to inserts it'd be about 15 times faster. I was hitting 5000 rows a sec on inserts..

I hate the record format but it has been fun trying to figure out a way to speed things up.

Thx again for the help, Dave

On Wed, Jun 11, 2003 at 09:09:12PM -0700, Jared Still wrote:
>
> Well, you *could* use Perl.
>
> You can then set the RowCacheSize attribute on
> the handle, and Perl will send data to Oracle in
> arrays ala Sqlplus.
>
> >From your example it appears that you may currently
> be doing individual INSERT statements for each record
> in your log file ( or DELETE or whatever ) and you
> really need to change that.
>
> But I think you know that already.
>
> Jared
>
>
> On Wednesday 11 June 2003 19:20, David Turner wrote:
> > 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/adg10
> > >pck.htm#37506
> > >
> > > http://download-east.oracle.com/docs/cd/B10501_01/appdev.920/a96590/adg10
> > >pck.htm#20419
> > >
> > > http://download-east.oracle.com/docs/cd/B10501_01/appdev.920/a96624/05_co
> > >lls.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]
> > > >
> > > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com
> > > > San Diego, California -- Mailing list and web hosting services
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-- 
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-- 
Author: David Turner
  INET: [EMAIL PROTECTED]

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