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IDS Forum

Re: Compare Data in Two table (Updated)

Posted By: Madison Pruet
Date: Wednesday, 18 May 2005, at 3:10 p.m.

In Response To: Re: Compare Data in Two table (Updated) (TUKOBA Ingale)

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If you want to minimize the activity on the machines that the customers=
are
using, I'd really suggest using ER with timestamp conflict resolution. =
If
you replicate only the primary keys to an different system, then you ge=
t
the keys that have changed and the time of the change. That should be
enough to know easily what has changed and what has not.

I'd define it as using timestamp CR because we perform upserts on the
target server, which means that you don't have to worry about getting a=
n
initial sync.


Triggers will impact the user application's performance.



=

"TUKOBA Ingale" =

<tukoba@yahoo.com =

> =
To
Sent by: ids@iiug.org =

forum.subscriber@ =
cc
iiug.org =

Subj=
ect
Re: Compare Data in Two table =

05/18/2005 10:40 (Updated) [4993] =

AM =

=

=

=

=

=





Thanks to all of you who replied to my message. Most of you suggested u=
sing
triggers. Triggers will definately get the job done but here are my
concerns.
1. We are talking about migrating at least 35 to 40 large tables.
2. These tables are updated live by company's web-site and few backgrou=
nd
process. We don't want our customers to experience shopping delay becua=
se
of additional trigger overhead. We are number 3 consumer electronics
retailer and web site traffic is very high.

How can I find out impact of triggers (in terms of slowing down the
web-site) without actually coding them and simulating load test.

ANy suggestion or commets are most welcome
Thanks


=

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<html><body>
<p>If you want to minimize the activity on the machines that the custom=
ers are using, I'd really suggest using ER with timestamp conflict reso=
lution. If you replicate only the primary keys to an different system,=
then you get the keys that have changed and the time of the change. T=
hat should be enough to know easily what has changed and what has not. =
<br>
<br>
I'd define it as using timestamp CR because we perform upserts on the t=
arget server, which means that you don't have to worry about getting an=
initial sync.<br>
<br>
<br>
Triggers will impact the user application's performance.<br>
<br>
<img src=3D"cid:10__=3D09BBFA96DFF5AB498f9e8a93df938@us.ibm.com" width=3D=
"16" height=3D"16" alt=3D"Inactive hide details for &quot;TUKOBA Ingale=
&quot; &lt;tukoba@yahoo.com&gt;">&quot;TUKOBA Ingale&quot; &lt;tukoba@y=
ahoo.com&gt;<br>
<br>
<br>

<table width=3D"100%" border=3D"0" cellspacing=3D"0" cellpadding=3D"0">=

<tr valign=3D"top"><td style=3D"background-image:url(cid:20__=3D09BBFA9=
6DFF5AB498f9e8a93df938@us.ibm.com); background-repeat: no-repeat; " wid=
th=3D"40%">
<ul>
<ul>
<ul>
<ul><b><font size=3D"2">&quot;TUKOBA Ingale&quot; &lt;tukoba@yahoo.com&=
gt;</font></b><font size=3D"2"> </font><br>
<font size=3D"2">Sent by: forum.subscriber@iiug.org</font>
<p><font size=3D"2">05/18/2005 10:40 AM</font></ul>
</ul>
</ul>
</ul>
</td><td width=3D"60%">
<table width=3D"100%" border=3D"0" cellspacing=3D"0" cellpadding=3D"0">=

<tr valign=3D"top"><td width=3D"1%" valign=3D"middle"><img src=3D"cid:3=
0__=3D09BBFA96DFF5AB498f9e8a93df938@us.ibm.com" border=3D"0" height=3D"=
1" width=3D"58" alt=3D""><br>
<div align=3D"right"><font size=3D"2">To</font></div></td><td width=3D"=
100%"><img src=3D"cid:30__=3D09BBFA96DFF5AB498f9e8a93df938@us.ibm.com" =
border=3D"0" height=3D"1" width=3D"1" alt=3D""><br>
<font size=3D"2">ids@iiug.org</font></td></tr>

<tr valign=3D"top"><td width=3D"1%" valign=3D"middle"><img src=3D"cid:3=
0__=3D09BBFA96DFF5AB498f9e8a93df938@us.ibm.com" border=3D"0" height=3D"=
1" width=3D"58" alt=3D""><br>
<div align=3D"right"><font size=3D"2">cc</font></div></td><td width=3D"=
100%"><img src=3D"cid:30__=3D09BBFA96DFF5AB498f9e8a93df938@us.ibm.com" =
border=3D"0" height=3D"1" width=3D"1" alt=3D""><br>
</td></tr>

<tr valign=3D"top"><td width=3D"1%" valign=3D"middle"><img src=3D"cid:3=
0__=3D09BBFA96DFF5AB498f9e8a93df938@us.ibm.com" border=3D"0" height=3D"=
1" width=3D"58" alt=3D""><br>
<div align=3D"right"><font size=3D"2">Subject</font></div></td><td widt=
h=3D"100%"><img src=3D"cid:30__=3D09BBFA96DFF5AB498f9e8a93df938@us.ibm.=
com" border=3D"0" height=3D"1" width=3D"1" alt=3D""><br>
<font size=3D"2">Re: Compare Data in Two table (Updated) [4993]</font>=
</td></tr>
</table>

<table border=3D"0" cellspacing=3D"0" cellpadding=3D"0">
<tr valign=3D"top"><td width=3D"58"><img src=3D"cid:30__=3D09BBFA96DFF5=
AB498f9e8a93df938@us.ibm.com" border=3D"0" height=3D"1" width=3D"1" alt=
=3D""></td><td width=3D"336"><img src=3D"cid:30__=3D09BBFA96DFF5AB498f9=
e8a93df938@us.ibm.com" border=3D"0" height=3D"1" width=3D"1" alt=3D""><=
/td></tr>
</table>
</td></tr>
</table>
<br>
<tt>Thanks to all of you who replied to my message. Most of you suggest=
ed using triggers. Triggers will definately get the job done but here a=
re my concerns.<br>
1. We are talking about migrating at least 35 to 40 large tables.<br>
2. These tables are updated live by company's web-site and few backgrou=
nd process. We don't want our customers to experience shopping delay be=
cuase of additional trigger overhead. We are number 3 consumer electron=
ics retailer and web site traffic is very high.<br>
<br>
How can I find out impact of triggers (in terms of slowing down the web=
-site) without actually coding them and simulating load test.<br>
<br>
ANy suggestion or commets are most welcome<br>
Thanks<br>
<br>
<br>
</tt><br>
</body></html>=


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